diff --git a/Modules/Segmentation/Interactions/mitknnUnetTool.cpp b/Modules/Segmentation/Interactions/mitknnUnetTool.cpp
index 9a64f9d539..9ca820f1e5 100644
--- a/Modules/Segmentation/Interactions/mitknnUnetTool.cpp
+++ b/Modules/Segmentation/Interactions/mitknnUnetTool.cpp
@@ -1,320 +1,313 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #include "mitknnUnetTool.h"
 
 #include "mitkIOUtil.h"
 #include "mitkProcessExecutor.h"
 #include <itksys/SystemTools.hxx>
 #include <usGetModuleContext.h>
 #include <usModule.h>
 #include <usModuleContext.h>
 #include <usModuleResource.h>
 
 namespace mitk
 {
   MITK_TOOL_MACRO(MITKSEGMENTATION_EXPORT, nnUNetTool, "nnUNet tool");
 }
 
-mitk::nnUNetTool::nnUNetTool()
-{
-  this->SetMitkTempDir(IOUtil::CreateTemporaryDirectory("mitk-XXXXXX"));
-}
-
 mitk::nnUNetTool::~nnUNetTool()
 {
   itksys::SystemTools::RemoveADirectory(this->GetMitkTempDir());
 }
 
 void mitk::nnUNetTool::Activated()
 {
   Superclass::Activated();
   this->SetLabelTransferMode(LabelTransferMode::AllLabels);
 }
 
 void mitk::nnUNetTool::RenderOutputBuffer()
 {
   if (m_OutputBuffer != nullptr)
   {
     try
     {
       if (nullptr != this->GetPreviewSegmentationNode())
       {
         auto previewImage = this->GetPreviewSegmentation();
         previewImage->InitializeByLabeledImage(m_OutputBuffer);
       }
     }
     catch (const mitk::Exception &e)
     {
       MITK_INFO << e.GetDescription();
     }
   }
 }
 
 void mitk::nnUNetTool::SetOutputBuffer(LabelSetImage::Pointer segmentation)
 {
   m_OutputBuffer = segmentation;
 }
 
 mitk::LabelSetImage::Pointer mitk::nnUNetTool::GetOutputBuffer()
 {
   return m_OutputBuffer;
 }
 
 void mitk::nnUNetTool::ClearOutputBuffer()
 {
   m_OutputBuffer = nullptr;
 }
 
 us::ModuleResource mitk::nnUNetTool::GetIconResource() const
 {
   us::Module *module = us::GetModuleContext()->GetModule();
   us::ModuleResource resource = module->GetResource("AI.svg");
   return resource;
 }
 
 const char **mitk::nnUNetTool::GetXPM() const
 {
   return nullptr;
 }
 
 const char *mitk::nnUNetTool::GetName() const
 {
   return "nnUNet";
 }
 
 mitk::DataStorage *mitk::nnUNetTool::GetDataStorage()
 {
   return this->GetToolManager()->GetDataStorage();
 }
 
 mitk::DataNode *mitk::nnUNetTool::GetRefNode()
 {
   return this->GetToolManager()->GetReferenceData(0);
 }
 
 namespace
 {
   void onPythonProcessEvent(itk::Object * /*pCaller*/, const itk::EventObject &e, void *)
   {
     std::string testCOUT;
     std::string testCERR;
     const auto *pEvent = dynamic_cast<const mitk::ExternalProcessStdOutEvent *>(&e);
 
     if (pEvent)
     {
       testCOUT = testCOUT + pEvent->GetOutput();
       MITK_INFO << testCOUT;
     }
 
     const auto *pErrEvent = dynamic_cast<const mitk::ExternalProcessStdErrEvent *>(&e);
 
     if (pErrEvent)
     {
       testCERR = testCERR + pErrEvent->GetOutput();
       MITK_ERROR << testCERR;
     }
   }
 } // namespace
 
 void mitk::nnUNetTool::DoUpdatePreview(const Image* inputAtTimeStep, const Image* /*oldSegAtTimeStep*/, LabelSetImage* previewImage, TimeStepType /*timeStep*/)
 {
+  if (this->GetMitkTempDir().empty())
+  {
+    this->SetMitkTempDir(IOUtil::CreateTemporaryDirectory("mitk-XXXXXX"));
+  }
   std::string inDir, outDir, inputImagePath, outputImagePath, scriptPath;
 
   ProcessExecutor::Pointer spExec = ProcessExecutor::New();
   itk::CStyleCommand::Pointer spCommand = itk::CStyleCommand::New();
   spCommand->SetCallback(&onPythonProcessEvent);
   spExec->AddObserver(ExternalProcessOutputEvent(), spCommand);
   ProcessExecutor::ArgumentListType args;
 
   inDir = IOUtil::CreateTemporaryDirectory("nnunet-in-XXXXXX", this->GetMitkTempDir());
   std::ofstream tmpStream;
   inputImagePath = IOUtil::CreateTemporaryFile(tmpStream, m_TEMPLATE_FILENAME, inDir + IOUtil::GetDirectorySeparator());
   tmpStream.close();
   std::size_t found = inputImagePath.find_last_of(IOUtil::GetDirectorySeparator());
   std::string fileName = inputImagePath.substr(found + 1);
   std::string token = fileName.substr(0, fileName.find("_"));
 
   if (this->GetNoPip())
   {
     scriptPath = this->GetnnUNetDirectory() + IOUtil::GetDirectorySeparator() + "nnunet" +
                  IOUtil::GetDirectorySeparator() + "inference" + IOUtil::GetDirectorySeparator() + "predict_simple.py";
   }
 
   try
   {
     if (this->GetMultiModal())
     {
       const std::string fileFormat(".nii.gz");
       const std::string fileNamePart("_000_000");
       std::string outModalFile;
       size_t len = inDir.length() + 1 + token.length() + fileNamePart.length() + 1 + fileFormat.length();
       outModalFile.reserve(len); // The 1(s) indicates a directory separator char and an underscore.
       for (size_t i = 0; i < m_OtherModalPaths.size(); ++i)
       {
         mitk::Image::ConstPointer modalImage = m_OtherModalPaths[i];
         outModalFile.append(inDir);
         outModalFile.push_back(IOUtil::GetDirectorySeparator());
         outModalFile.append(token);
         outModalFile.append(fileNamePart);
         outModalFile.append(std::to_string(i));
         outModalFile.append(fileFormat);
         IOUtil::Save(modalImage.GetPointer(), outModalFile);
         outModalFile.clear();
       }
     }
     else
     {
       IOUtil::Save(inputAtTimeStep, inputImagePath);
     }
   }
   catch (const mitk::Exception &e)
   {
-    /*
-    Can't throw mitk exception to the caller. Refer: T28691
-    */
     MITK_ERROR << e.GetDescription();
     return;
   }
   // Code calls external process
   std::string command = "nnUNet_predict";
   if (this->GetNoPip())
   {
 #ifdef _WIN32
     command = "python";
 #else
     command = "python3";
 #endif
   }
   for (ModelParams &modelparam : m_ParamQ)
   {
     outDir = IOUtil::CreateTemporaryDirectory("nnunet-out-XXXXXX", this->GetMitkTempDir());
     outputImagePath = outDir + IOUtil::GetDirectorySeparator() + token + "_000.nii.gz";
     modelparam.outputDir = outDir;
     args.clear();
     if (this->GetNoPip())
     {
       args.push_back(scriptPath);
     }
     args.push_back("-i");
     args.push_back(inDir);
 
     args.push_back("-o");
     args.push_back(outDir);
 
     args.push_back("-t");
     args.push_back(modelparam.task);
 
     if (modelparam.model.find("cascade") != std::string::npos)
     {
       args.push_back("-ctr");
     }
     else
     {
       args.push_back("-tr");
     }
     args.push_back(modelparam.trainer);
 
     args.push_back("-m");
     args.push_back(modelparam.model);
 
     args.push_back("-p");
     args.push_back(modelparam.planId);
 
     if (!modelparam.folds.empty())
     {
       args.push_back("-f");
       for (auto fold : modelparam.folds)
       {
         args.push_back(fold);
       }
     }
 
     args.push_back("--num_threads_nifti_save");
     args.push_back("1"); // fixing to 1
 
     if (!this->GetMirror())
     {
       args.push_back("--disable_tta");
     }
 
     if (!this->GetMixedPrecision())
     {
       args.push_back("--disable_mixed_precision");
     }
 
     if (this->GetEnsemble())
     {
       args.push_back("--save_npz");
     }
 
     try
     {
       std::string resultsFolderEnv = "RESULTS_FOLDER=" + this->GetModelDirectory();
       itksys::SystemTools::PutEnv(resultsFolderEnv.c_str());
       std::string cudaEnv = "CUDA_VISIBLE_DEVICES=" + std::to_string(this->GetGpuId());
       itksys::SystemTools::PutEnv(cudaEnv.c_str());
 
       spExec->Execute(this->GetPythonPath(), command, args);
     }
     catch (const mitk::Exception &e)
     {
       /*
       Can't throw mitk exception to the caller. Refer: T28691
       */
       MITK_ERROR << e.GetDescription();
       return;
     }
   }
   if (this->GetEnsemble() && !this->GetPostProcessingJsonDirectory().empty())
   {
     args.clear();
     command = "nnUNet_ensemble";
     outDir = IOUtil::CreateTemporaryDirectory("nnunet-ensemble-out-XXXXXX", this->GetMitkTempDir());
     outputImagePath = outDir + IOUtil::GetDirectorySeparator() + token + "_000.nii.gz";
 
     args.push_back("-f");
     for (ModelParams &modelparam : m_ParamQ)
     {
       args.push_back(modelparam.outputDir);
     }
 
     args.push_back("-o");
     args.push_back(outDir);
 
     if (!this->GetPostProcessingJsonDirectory().empty())
     {
       args.push_back("-pp");
       args.push_back(this->GetPostProcessingJsonDirectory());
     }
 
     spExec->Execute(this->GetPythonPath(), command, args);
   }
   try
   {
     Image::Pointer outputImage = IOUtil::Load<Image>(outputImagePath);
     previewImage->InitializeByLabeledImage(outputImage);
     previewImage->SetGeometry(inputAtTimeStep->GetGeometry());
     m_InputBuffer = inputAtTimeStep;
     m_OutputBuffer = mitk::LabelSetImage::New();
     m_OutputBuffer->InitializeByLabeledImage(outputImage);
     m_OutputBuffer->SetGeometry(inputAtTimeStep->GetGeometry());
   }
   catch (const mitk::Exception &e)
   {
-    /*
-    Can't throw mitk exception to the caller. Refer: T28691
-    */
     MITK_ERROR << e.GetDescription();
     return;
   }
 }
diff --git a/Modules/Segmentation/Interactions/mitknnUnetTool.h b/Modules/Segmentation/Interactions/mitknnUnetTool.h
index 70f84a68b8..af8f1f6465 100644
--- a/Modules/Segmentation/Interactions/mitknnUnetTool.h
+++ b/Modules/Segmentation/Interactions/mitknnUnetTool.h
@@ -1,214 +1,214 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #ifndef mitknnUnetTool_h
 #define mitknnUnetTool_h
 
 #include "mitkSegWithPreviewTool.h"
 #include "mitkCommon.h"
 #include "mitkToolManager.h"
 #include <MitkSegmentationExports.h>
 #include <mitkStandardFileLocations.h>
 #include <numeric>
 #include <utility>
 
 namespace us
 {
   class ModuleResource;
 }
 
 namespace mitk
 {
   /**
    * @brief nnUNet parameter request object holding all model parameters for input.
    * Also holds output temporary directory path.
    */
   struct ModelParams
   {
     std::string task;
     std::vector<std::string> folds;
     std::string model;
     std::string trainer;
     std::string planId;
     std::string outputDir;
     std::string inputName;
     std::string timeStamp;
 
     size_t generateHash() const
     {
       std::string toHash;
       std::string foldsConcatenated = std::accumulate(folds.begin(), folds.end(), std::string(""));
       toHash += this->task;
       toHash += this->model;
       toHash += this->inputName;
       toHash += foldsConcatenated;
       toHash += this->timeStamp;
       size_t hashVal = std::hash<std::string>{}(toHash);
       return hashVal;
     }
   };
 
   /**
     \brief nnUNet segmentation tool.
 
     \ingroup Interaction
     \ingroup ToolManagerEtAl
 
     \warning Only to be instantiated by mitk::ToolManager.
   */
   class MITKSEGMENTATION_EXPORT nnUNetTool : public SegWithPreviewTool
   {
   public:
     mitkClassMacro(nnUNetTool, SegWithPreviewTool);
     itkFactorylessNewMacro(Self);
     itkCloneMacro(Self);
 
     const char **GetXPM() const override;
     const char *GetName() const override;
     us::ModuleResource GetIconResource() const override;
 
     void Activated() override;
 
     itkSetMacro(nnUNetDirectory, std::string);
     itkGetConstMacro(nnUNetDirectory, std::string);
 
     itkSetMacro(ModelDirectory, std::string);
     itkGetConstMacro(ModelDirectory, std::string);
 
     itkSetMacro(PythonPath, std::string);
     itkGetConstMacro(PythonPath, std::string);
 
     itkSetMacro(MitkTempDir, std::string);
     itkGetConstMacro(MitkTempDir, std::string);
 
     itkSetMacro(PostProcessingJsonDirectory, std::string);
     itkGetConstMacro(PostProcessingJsonDirectory, std::string);
 
     itkSetMacro(MixedPrecision, bool);
     itkGetConstMacro(MixedPrecision, bool);
     itkBooleanMacro(MixedPrecision);
 
     itkSetMacro(Mirror, bool);
     itkGetConstMacro(Mirror, bool);
     itkBooleanMacro(Mirror);
 
     itkSetMacro(MultiModal, bool);
     itkGetConstMacro(MultiModal, bool);
     itkBooleanMacro(MultiModal);
 
     itkSetMacro(NoPip, bool);
     itkGetConstMacro(NoPip, bool);
     itkBooleanMacro(NoPip);
 
     itkSetMacro(Ensemble, bool);
     itkGetConstMacro(Ensemble, bool);
     itkBooleanMacro(Ensemble);
 
     itkSetMacro(Predict, bool);
     itkGetConstMacro(Predict, bool);
     itkBooleanMacro(Predict);
 
     itkSetMacro(GpuId, unsigned int);
     itkGetConstMacro(GpuId, unsigned int);
 
     /**
      * @brief vector of ModelParams.
      * Size > 1 only for ensemble prediction.
      */
     std::vector<ModelParams> m_ParamQ;
 
     /**
      * @brief Holds paths to other input image modalities.
      *
      */
     std::vector<mitk::Image::ConstPointer> m_OtherModalPaths;
 
     mitk::Image::ConstPointer m_InputBuffer;
 
     /**
      * @brief Renders the output LabelSetImage.
      * To called in the main thread.
      */
     void RenderOutputBuffer();
 
     /**
      * @brief Get the Output Buffer object
      *
      * @return LabelSetImage::Pointer
      */
     LabelSetImage::Pointer GetOutputBuffer();
 
     /**
      * @brief Sets the outputBuffer to nullptr
      *
      */
     void ClearOutputBuffer();
 
     /**
      *  @brief Returns the DataStorage from the ToolManager
      */
     mitk::DataStorage *GetDataStorage();
 
     mitk::DataNode *GetRefNode();
 
     void SetOutputBuffer(LabelSetImage::Pointer);
 
   protected:
     /**
-     * @brief Construct a new nnUNet Tool object and temp directory.
+     * @brief Construct a new nnUNet Tool object.
      *
      */
-    nnUNetTool();
+    nnUNetTool() = default;
 
     /**
      * @brief Destroy the nnUNet Tool object and deletes the temp directory.
      *
      */
     ~nnUNetTool();
 
     /**
      * @brief Overriden method from the tool manager to execute the segmentation
      * Implementation:
      * 1. Saves the inputAtTimeStep in a temporary directory.
      * 2. Copies other modalities, renames and saves in the temporary directory, if required.
      * 3. Sets RESULTS_FOLDER and CUDA_VISIBLE_DEVICES variables in the environment.
      * 3. Iterates through the parameter queue (m_ParamQ) and executes "nnUNet_predict" command with the parameters
      * 4. Expects an output image to be saved in the temporary directory by the python proces. Loads it as
      *    LabelSetImage and sets to previewImage.
      *
      * @param inputAtTimeStep
      * @param oldSegAtTimeStep
      * @param previewImage
      * @param timeStep
      */
     void DoUpdatePreview(const Image* inputAtTimeStep, const Image* oldSegAtTimeStep, LabelSetImage* previewImage, TimeStepType timeStep) override;
 
   private:
     std::string m_MitkTempDir;
     std::string m_nnUNetDirectory;
     std::string m_ModelDirectory;
     std::string m_PythonPath;
     std::string m_PostProcessingJsonDirectory;
     // bool m_UseGPU; kept for future
     // bool m_AllInGPU;
     bool m_MixedPrecision;
     bool m_Mirror;
     bool m_NoPip;
     bool m_MultiModal;
     bool m_Ensemble = false;
     bool m_Predict;
     LabelSetImage::Pointer m_OutputBuffer;
     unsigned int m_GpuId;
     const std::string m_TEMPLATE_FILENAME = "XXXXXX_000_0000.nii.gz";
   };
 } // namespace mitk
 #endif
diff --git a/Modules/SegmentationUI/Qmitk/QmitknnUNetGPU.cpp b/Modules/SegmentationUI/Qmitk/QmitknnUNetGPU.cpp
index d0478d1332..67217dd9ec 100644
--- a/Modules/SegmentationUI/Qmitk/QmitknnUNetGPU.cpp
+++ b/Modules/SegmentationUI/Qmitk/QmitknnUNetGPU.cpp
@@ -1,52 +1,55 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.s
 
 ============================================================================*/
 
 #include "QmitknnUNetGPU.h"
 #include <QProcess>
 
 QmitkGPULoader::QmitkGPULoader()
 {
   QProcess process;
   process.start("nvidia-smi --query-gpu=name,memory.total --format=csv");
   process.waitForFinished(-1);
   QStringList infoStringList;
   while (process.canReadLine())
   {
     QString line = process.readLine();
     if (!line.startsWith("name"))
     {
       infoStringList << line;
     }
   }
   unsigned int count = 0;
   foreach (QString infoString, infoStringList)
   {
     QmitkGPUSpec spec;
     QStringList gpuDetails;
     gpuDetails = infoString.split(",");
-    spec.name = gpuDetails.at(0);
-    spec.id = count;
-    spec.memory = gpuDetails.at(1);
-    this->m_Gpus.push_back(spec);
-    ++count;
+    if(gpuDetails.count() == 2)
+    {
+      spec.name = gpuDetails.at(0);
+      spec.id = count;
+      spec.memory = gpuDetails.at(1);
+      this->m_Gpus.push_back(spec);
+      ++count;
+    }
   }
 }
 
 int QmitkGPULoader::GetGPUCount()
 {
   return static_cast<int>(m_Gpus.size());
 }
 
 std::vector<QmitkGPUSpec> QmitkGPULoader::GetAllGPUSpecs()
 {
   return m_Gpus;
 }
diff --git a/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.cpp b/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.cpp
index 5950d12764..1182ce51b0 100644
--- a/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.cpp
+++ b/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.cpp
@@ -1,1188 +1,1196 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #include "QmitknnUNetToolGUI.h"
 
 #include "mitkProcessExecutor.h"
 #include "mitknnUnetTool.h"
 #include <QApplication>
 #include <QDir>
 #include <QDirIterator>
 #include <QIcon>
 #include <QmitkStyleManager.h>
 #include <QmitknnUNetEnsembleLayout.h>
 #include <QtGlobal>
 #include <algorithm>
 #include <ctkCollapsibleGroupBox.h>
 #include <itksys/SystemTools.hxx>
 #include <nlohmann/json.hpp>
 #include <mitkIOUtil.h>
 
 MITK_TOOL_GUI_MACRO(MITKSEGMENTATIONUI_EXPORT, QmitknnUNetToolGUI, "")
 
 QmitknnUNetToolGUI::QmitknnUNetToolGUI() : QmitkMultiLabelSegWithPreviewToolGUIBase(), m_SuperclassEnableConfirmSegBtnFnc(m_EnableConfirmSegBtnFnc)
 {
   // Nvidia-smi command returning zero doesn't always imply lack of GPUs.
   // Pytorch uses its own libraries to communicate to the GPUs. Hence, only a warning can be given.
   if (m_GpuLoader.GetGPUCount() == 0)
   {
     std::string warning = "WARNING: No GPUs were detected on your machine. The nnUNet tool might not work.";
     this->ShowErrorMessage(warning);
   }
 
   // define predicates for multi modal data selection combobox
   auto imageType = mitk::TNodePredicateDataType<mitk::Image>::New();
   auto labelSetImageType = mitk::NodePredicateNot::New(mitk::TNodePredicateDataType<mitk::LabelSetImage>::New());
   m_MultiModalPredicate = mitk::NodePredicateAnd::New(imageType, labelSetImageType).GetPointer();
 
   m_nnUNetThread = new QThread(this);
   m_Worker = new nnUNetDownloadWorker;
   m_Worker->moveToThread(m_nnUNetThread);
   
   m_EnableConfirmSegBtnFnc = [this](bool enabled)
   {
     return !m_FirstPreviewComputation ? m_SuperclassEnableConfirmSegBtnFnc(enabled) : false;
   };
 }
 
 QmitknnUNetToolGUI::~QmitknnUNetToolGUI()
 {
   m_nnUNetThread->quit();
   m_nnUNetThread->wait();
 }
 
 void QmitknnUNetToolGUI::ConnectNewTool(mitk::SegWithPreviewTool *newTool)
 {
   Superclass::ConnectNewTool(newTool);
   newTool->IsTimePointChangeAwareOff();
   m_FirstPreviewComputation = true;
 }
 
 void QmitknnUNetToolGUI::InitializeUI(QBoxLayout *mainLayout)
 {
   m_Controls.setupUi(this);
 #ifndef _WIN32
   m_Controls.pythonEnvComboBox->addItem("/usr/bin");
 #endif
   m_Controls.pythonEnvComboBox->addItem("Select");
   AutoParsePythonPaths();
   SetGPUInfo();
   connect(m_Controls.previewButton, SIGNAL(clicked()), this, SLOT(OnPreviewRequested()));
   connect(m_Controls.modeldirectoryBox,
           SIGNAL(directoryChanged(const QString &)),
           this,
           SLOT(OnDirectoryChanged(const QString &)));
   connect(
     m_Controls.modelBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnModelChanged(const QString &)));
   connect(m_Controls.taskBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnTaskChanged(const QString &)));
   connect(
     m_Controls.plannerBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnTrainerChanged(const QString &)));
   connect(m_Controls.multiModalBox, SIGNAL(stateChanged(int)), this, SLOT(OnCheckBoxChanged(int)));
   connect(m_Controls.pythonEnvComboBox,
 #if QT_VERSION >= 0x050F00 // 5.15
           SIGNAL(textActivated(const QString &)),
 #elif QT_VERSION >= 0x050C00 // 5.12
           SIGNAL(currentTextChanged(const QString &)),
 #endif
           this,
           SLOT(OnPythonPathChanged(const QString &)));
   connect(m_Controls.refreshdirectoryBox, SIGNAL(clicked()), this, SLOT(OnRefreshPresssed()));
   connect(m_Controls.clearCacheButton, SIGNAL(clicked()), this, SLOT(OnClearCachePressed()));
   connect(m_Controls.startDownloadButton, SIGNAL(clicked()), this, SLOT(OnDownloadModel()));
   connect(m_Controls.stopDownloadButton, SIGNAL(clicked()), this, SLOT(OnStopDownload()));
 
   // Qthreads
   qRegisterMetaType<mitk::ProcessExecutor::Pointer>();
   qRegisterMetaType<mitk::ProcessExecutor::ArgumentListType>();
   connect(this, &QmitknnUNetToolGUI::Operate, m_Worker, &nnUNetDownloadWorker::DoWork);
   connect(m_Worker, &nnUNetDownloadWorker::Exit, this, &QmitknnUNetToolGUI::OnDownloadWorkerExit);
   connect(m_nnUNetThread, &QThread::finished, m_Worker, &QObject::deleteLater);
 
   m_Controls.multiModalValueLabel->setStyleSheet("font-weight: bold; color: white");
   m_Controls.multiModalValueLabel->setVisible(false);
   m_Controls.requiredModalitiesLabel->setVisible(false);
   m_Controls.stopDownloadButton->setVisible(false);
   m_Controls.previewButton->setEnabled(false);
 
   QIcon refreshIcon =
     QmitkStyleManager::ThemeIcon(QStringLiteral(":/org_mitk_icons/icons/awesome/scalable/actions/view-refresh.svg"));
   m_Controls.refreshdirectoryBox->setIcon(refreshIcon);
   QIcon dirIcon =
     QmitkStyleManager::ThemeIcon(QStringLiteral(":/org_mitk_icons/icons/awesome/scalable/actions/document-open.svg"));
   m_Controls.modeldirectoryBox->setIcon(dirIcon);
   m_Controls.refreshdirectoryBox->setEnabled(true);
   QIcon stopIcon =
     QmitkStyleManager::ThemeIcon(QStringLiteral(":/org_mitk_icons/icons/awesome/scalable/status/dialog-error.svg"));
   m_Controls.stopDownloadButton->setIcon(stopIcon);
 
   m_Controls.statusLabel->setTextFormat(Qt::RichText);
   if (m_GpuLoader.GetGPUCount() != 0)
   {
     WriteStatusMessage(QString("<b>STATUS: </b><i>Welcome to nnUNet. " + QString::number(m_GpuLoader.GetGPUCount()) +
                                " GPUs were detected.</i>"));
   }
   else
   {
     WriteErrorMessage(QString("<b>STATUS: </b><i>Welcome to nnUNet. " + QString::number(m_GpuLoader.GetGPUCount()) +
                               " GPUs were detected.</i>"));
   }
   mainLayout->addLayout(m_Controls.verticalLayout);
   Superclass::InitializeUI(mainLayout);
   m_UI_ROWS = m_Controls.advancedSettingsLayout->rowCount(); // Must do. Row count is correct only here.
   this->DisableEverything();
   QString lastSelectedPyEnv = m_Settings.value("nnUNet/LastPythonPath").toString();
   m_Controls.pythonEnvComboBox->setCurrentText(lastSelectedPyEnv);
 }
 
 void QmitknnUNetToolGUI::EnableWidgets(bool enabled)
 {
   Superclass::EnableWidgets(enabled);
 }
 
 void QmitknnUNetToolGUI::ClearAllModalities()
 {
   m_Controls.multiModalBox->setChecked(false);
   this->ClearAllModalLabels();
 }
 
 void QmitknnUNetToolGUI::ClearAllModalLabels()
 {
   for (auto modalLabel : m_ModalLabels)
   {
     delete modalLabel; // delete the layout item
     m_ModalLabels.pop_back();
   }
   m_Controls.advancedSettingsLayout->update();
 }
 
 void QmitknnUNetToolGUI::DisableEverything()
 {
   m_Controls.modeldirectoryBox->setEnabled(false);
   m_Controls.refreshdirectoryBox->setEnabled(false);
   m_Controls.previewButton->setEnabled(false);
   m_Controls.multiModalValueLabel->setVisible(false);
   m_Controls.multiModalBox->setEnabled(false);
   this->ClearAllComboBoxes();
   this->ClearAllModalities();
 }
 
 void QmitknnUNetToolGUI::ClearAllComboBoxes()
 {
   m_Controls.modelBox->clear();
   m_Controls.taskBox->clear();
   m_Controls.foldBox->clear();
   m_Controls.trainerBox->clear();
   m_Controls.plannerBox->clear();
   for (auto &layout : m_EnsembleParams)
   {
     layout->modelBox->clear();
     layout->trainerBox->clear();
     layout->plannerBox->clear();
     layout->foldBox->clear();
   }
 }
 
 std::vector<mitk::Image::ConstPointer> QmitknnUNetToolGUI::FetchMultiModalImagesFromUI()
 {
   std::vector<mitk::Image::ConstPointer> modals;
   if (m_Controls.multiModalBox->isChecked() && !m_Modalities.empty())
   {
     std::set<std::string> nodeNames; // set container for keeping names of all nodes to check if they are added twice.
-    for (QmitkDataStorageComboBox *modality : m_Modalities)
-    {
-      if (nodeNames.find(modality->GetSelectedNode()->GetName()) == nodeNames.end())
+    for (QmitkSingleNodeSelectionWidget *modality : m_Modalities)
+    { 
+      mitk::DataNode::Pointer node = modality->GetSelectedNode();
+      if (nodeNames.find(node->GetName()) == nodeNames.end())
       {
-        modals.push_back(dynamic_cast<const mitk::Image *>(modality->GetSelectedNode()->GetData()));
-        nodeNames.insert(modality->GetSelectedNode()->GetName());
+        modals.push_back(dynamic_cast<const mitk::Image *>(node->GetData()));
+        nodeNames.insert(node->GetName());
       }
       else
       {
         throw std::runtime_error("Same modality is selected more than once. Please change your selection.");
         break;
       }
     }
   }
   return modals;
 }
 
 bool QmitknnUNetToolGUI::IsNNUNetInstalled(const QString &pythonPath)
 {
   QString fullPath = pythonPath;
 #ifdef _WIN32
   if (!(fullPath.endsWith("Scripts", Qt::CaseInsensitive) || fullPath.endsWith("Scripts/", Qt::CaseInsensitive)))
   {
     fullPath += QDir::separator() + QString("Scripts");
   }
 #else
   if (!(fullPath.endsWith("bin", Qt::CaseInsensitive) || fullPath.endsWith("bin/", Qt::CaseInsensitive)))
   {
     fullPath += QDir::separator() + QString("bin");
   }
 #endif
   fullPath = fullPath.mid(fullPath.indexOf(" ") + 1);
   bool isExists = QFile::exists(fullPath + QDir::separator() + QString("nnUNet_predict")) &&
                   QFile::exists(fullPath + QDir::separator() + QString("python3"));
   return isExists;
 }
 
 void QmitknnUNetToolGUI::ShowErrorMessage(const std::string &message, QMessageBox::Icon icon)
 {
   this->setCursor(Qt::ArrowCursor);
   QMessageBox *messageBox = new QMessageBox(icon, nullptr, message.c_str());
   messageBox->exec();
   delete messageBox;
   MITK_WARN << message;
 }
 
 void QmitknnUNetToolGUI::WriteStatusMessage(const QString &message)
 {
   m_Controls.statusLabel->setText(message);
   m_Controls.statusLabel->setStyleSheet("font-weight: bold; color: white");
 }
 
 void QmitknnUNetToolGUI::WriteErrorMessage(const QString &message)
 {
   m_Controls.statusLabel->setText(message);
   m_Controls.statusLabel->setStyleSheet("font-weight: bold; color: red");
 }
 
 void QmitknnUNetToolGUI::ProcessEnsembleModelsParams(mitk::nnUNetTool::Pointer tool)
 {
   if (m_EnsembleParams[0]->modelBox->currentText() == m_EnsembleParams[1]->modelBox->currentText())
   {
     throw std::runtime_error("Both models you have selected for ensembling are the same.");
   }
   QString taskName = m_Controls.taskBox->currentText();
   bool isPPJson = m_Controls.postProcessingCheckBox->isChecked();
   std::vector<mitk::ModelParams> requestQ;
   QString ppDirFolderNamePart1 = "ensemble_";
   QStringList ppDirFolderNameParts;
   for (auto &layout : m_EnsembleParams)
   {
     QStringList ppDirFolderName;
     QString modelName = layout->modelBox->currentText();
     ppDirFolderName << modelName;
     ppDirFolderName << "__";
     QString trainer = layout->trainerBox->currentText();
     ppDirFolderName << trainer;
     ppDirFolderName << "__";
     QString planId = layout->plannerBox->currentText();
     ppDirFolderName << planId;
 
     if (!this->IsModelExists(modelName, taskName, QString(trainer + "__" + planId)))
     {
       std::string errorMsg = "The configuration " + modelName.toStdString() +
                              " you have selected doesn't exist. Check your Results Folder again.";
       throw std::runtime_error(errorMsg);
     }
     std::vector<std::string> testfold = FetchSelectedFoldsFromUI(layout->foldBox);
     mitk::ModelParams modelObject = MapToRequest(modelName, taskName, trainer, planId, testfold);
     requestQ.push_back(modelObject);
     ppDirFolderNameParts << ppDirFolderName.join(QString(""));
   }
   tool->EnsembleOn();
   if (isPPJson)
   {
     QString ppJsonFilePossibility1 = QDir::cleanPath(
       m_ParentFolder->getResultsFolder() + QDir::separator() + "nnUNet" + QDir::separator() + "ensembles" +
       QDir::separator() + taskName + QDir::separator() + ppDirFolderNamePart1 + ppDirFolderNameParts.first() + "--" +
       ppDirFolderNameParts.last() + QDir::separator() + "postprocessing.json");
     QString ppJsonFilePossibility2 = QDir::cleanPath(
       m_ParentFolder->getResultsFolder() + QDir::separator() + "nnUNet" + QDir::separator() + "ensembles" +
       QDir::separator() + taskName + QDir::separator() + ppDirFolderNamePart1 + ppDirFolderNameParts.last() + "--" +
       ppDirFolderNameParts.first() + QDir::separator() + "postprocessing.json");
 
     if (QFile(ppJsonFilePossibility1).exists())
     {
       tool->SetPostProcessingJsonDirectory(ppJsonFilePossibility1.toStdString());
       const QString statusMsg = "<i>Post Processing JSON file found: </i>" + ppJsonFilePossibility1;
       this->WriteStatusMessage(statusMsg);
     }
     else if (QFile(ppJsonFilePossibility2).exists())
     {
       tool->SetPostProcessingJsonDirectory(ppJsonFilePossibility2.toStdString());
       const QString statusMsg = "<i>Post Processing JSON file found:</i>" + ppJsonFilePossibility2;
       this->WriteStatusMessage(statusMsg);
     }
     else
     {
       std::string errorMsg =
         "No post processing file was found for the selected ensemble combination. Continuing anyway...";
       this->ShowErrorMessage(errorMsg);
     }
   }
   tool->m_ParamQ.clear();
   tool->m_ParamQ = requestQ;
 }
 
 void QmitknnUNetToolGUI::ProcessModelParams(mitk::nnUNetTool::Pointer tool)
 {
   tool->EnsembleOff();
   std::vector<mitk::ModelParams> requestQ;
   QString modelName = m_Controls.modelBox->currentText();
   QString taskName = m_Controls.taskBox->currentText();
   QString trainer = m_Controls.trainerBox->currentText();
   QString planId = m_Controls.plannerBox->currentText();
   std::vector<std::string> fetchedFolds = this->FetchSelectedFoldsFromUI(m_Controls.foldBox);
   mitk::ModelParams modelObject = MapToRequest(modelName, taskName, trainer, planId, fetchedFolds);
   requestQ.push_back(modelObject);
   tool->m_ParamQ.clear();
   tool->m_ParamQ = requestQ;
 }
 
 bool QmitknnUNetToolGUI::IsModelExists(const QString &modelName, const QString &taskName, const QString &trainerPlanner)
 {
   QString modelSearchPath =
     QDir::cleanPath(m_ParentFolder->getResultsFolder() + QDir::separator() + "nnUNet" + QDir::separator() + modelName +
                     QDir::separator() + taskName + QDir::separator() + trainerPlanner);
   if (QDir(modelSearchPath).exists())
   {
     return true;
   }
   return false;
 }
 
 void QmitknnUNetToolGUI::CheckAllInCheckableComboBox(ctkCheckableComboBox *foldBox)
 {
   // Recalling all added items to check-mark it.
   const QAbstractItemModel *qaim = foldBox->checkableModel();
   auto rows = qaim->rowCount();
   for (std::remove_const_t<decltype(rows)> i = 0; i < rows; ++i)
   {
     const QModelIndex mi = qaim->index(i, 0);
     foldBox->setCheckState(mi, Qt::Checked);
   }
 }
 
 std::pair<QStringList, QStringList> QmitknnUNetToolGUI::ExtractTrainerPlannerFromString(QStringList trainerPlanners)
 {
   QString splitterString = "__";
   QStringList trainers, planners;
   for (const auto &trainerPlanner : trainerPlanners)
   {
     trainers << trainerPlanner.split(splitterString, QString::SplitBehavior::SkipEmptyParts).first();
     planners << trainerPlanner.split(splitterString, QString::SplitBehavior::SkipEmptyParts).last();
   }
   trainers.removeDuplicates();
   planners.removeDuplicates();
   return std::make_pair(trainers, planners);
 }
 
 std::vector<std::string> QmitknnUNetToolGUI::FetchSelectedFoldsFromUI(ctkCheckableComboBox *foldBox)
 {
   std::vector<std::string> folds;
   if (foldBox->noneChecked())
   {
     this->CheckAllInCheckableComboBox(foldBox);
   }
   QModelIndexList foldList = foldBox->checkedIndexes();
   for (const auto &index : foldList)
   {
     QString foldQString = foldBox->itemText(index.row());
     if(foldQString != "dummy_element_that_nobody_can_see")
     {
     foldQString = foldQString.split("_", QString::SplitBehavior::SkipEmptyParts).last();
     folds.push_back(foldQString.toStdString());
     }
     else
     {
       throw std::runtime_error("Folds are not recognized. Please check if your nnUNet results folder structure is legitimate");
     }
   }
   return folds;
 }
 
 void QmitknnUNetToolGUI::UpdateCacheCountOnUI()
 {
   QString cacheText = m_CACHE_COUNT_BASE_LABEL + QString::number(m_Cache.size());
   m_Controls.cacheCountLabel->setText(cacheText);
 }
 
 void QmitknnUNetToolGUI::AddToCache(size_t &hashKey, mitk::LabelSetImage::ConstPointer mlPreview)
 {
   nnUNetCache *newCacheObj = new nnUNetCache;
   newCacheObj->m_SegCache = mlPreview;
   m_Cache.insert(hashKey, newCacheObj);
   MITK_INFO << "New hash: " << hashKey << " " << newCacheObj->m_SegCache.GetPointer();
   this->UpdateCacheCountOnUI();
 }
 
 void QmitknnUNetToolGUI::SetGPUInfo()
 {
   std::vector<QmitkGPUSpec> specs = m_GpuLoader.GetAllGPUSpecs();
   for (const QmitkGPUSpec &gpuSpec : specs)
   {
     m_Controls.gpuComboBox->addItem(QString::number(gpuSpec.id) + ": " + gpuSpec.name + " (" + gpuSpec.memory + ")");
   }
   if (specs.empty())
   {
     m_Controls.gpuComboBox->setEditable(true);
     m_Controls.gpuComboBox->addItem(QString::number(0));
     m_Controls.gpuComboBox->setValidator(new QIntValidator(0, 999, this));
   }
 }
 
 unsigned int QmitknnUNetToolGUI::FetchSelectedGPUFromUI()
 {
   QString gpuInfo = m_Controls.gpuComboBox->currentText();
   if (m_GpuLoader.GetGPUCount() == 0)
   {
     return static_cast<unsigned int>(gpuInfo.toInt());
   }
   else
   {
     QString gpuId = gpuInfo.split(":", QString::SplitBehavior::SkipEmptyParts).first();
     return static_cast<unsigned int>(gpuId.toInt());
   }
 }
 
 QString QmitknnUNetToolGUI::FetchResultsFolderFromEnv()
 {
   const char *pathVal = itksys::SystemTools::GetEnv("RESULTS_FOLDER");
   QString retVal;
   if (pathVal)
   {
     retVal = QString::fromUtf8(pathVal);
   }
   else
   {
     retVal = m_Settings.value("nnUNet/LastRESULTS_FOLDERPath").toString();
   }
   return retVal;
 }
 
 void QmitknnUNetToolGUI::DumpJSONfromPickle(const QString &picklePath)
 {
   const QString pickleFile = picklePath + QDir::separator() + m_PICKLE_FILENAME;
   const QString jsonFile = picklePath + QDir::separator() + m_MITK_EXPORT_JSON_FILENAME;
   if (!QFile::exists(jsonFile))
   {
     mitk::ProcessExecutor::Pointer spExec = mitk::ProcessExecutor::New();
     mitk::ProcessExecutor::ArgumentListType args;
     args.push_back("-c");
     std::string pythonCode; // python syntax to parse plans.pkl file and export as Json file.
     pythonCode.append("import pickle;");
     pythonCode.append("import json;");
     pythonCode.append("loaded_pickle = pickle.load(open('");
     pythonCode.append(pickleFile.toStdString());
     pythonCode.append("','rb'));");
     pythonCode.append("modal_dict = {key: loaded_pickle[key] for key in loaded_pickle.keys() if key in "
                       "['modalities','num_modalities']};");
     pythonCode.append("json.dump(modal_dict, open('");
     pythonCode.append(jsonFile.toStdString());
     pythonCode.append("', 'w'))");
 
     args.push_back(pythonCode);
     try
     {
       spExec->Execute(m_PythonPath.toStdString(), "python3", args);
     }
     catch (const mitk::Exception &e)
     {
       MITK_ERROR << "Pickle parsing FAILED!" << e.GetDescription();
       this->WriteStatusMessage(
         "Parsing failed in backend. Multiple Modalities will now have to be manually entered by the user.");
     }
   }
 }
 
 void QmitknnUNetToolGUI::ExportAvailableModelsAsJSON(const QString &resultsFolder)
 {
   const QString jsonPath = resultsFolder + QDir::separator() + m_AVAILABLE_MODELS_JSON_FILENAME;
   if (!QFile::exists(jsonPath))
   {
     auto spExec = mitk::ProcessExecutor::New();
     mitk::ProcessExecutor::ArgumentListType args;
     args.push_back("--export");
     args.push_back(resultsFolder.toStdString());
     try
     {
       spExec->Execute(m_PythonPath.toStdString(), "nnUNet_print_available_pretrained_models", args);
     }
     catch (const mitk::Exception &e)
     {
       MITK_ERROR << "Exporting information FAILED." << e.GetDescription();
       this->WriteStatusMessage("Exporting information FAILED.");
     }
   }
 }
 
 void QmitknnUNetToolGUI::DisplayMultiModalInfoFromJSON(const QString &jsonPath)
 {
   std::ifstream file(jsonPath.toStdString());
   if (file.is_open())
   {
     auto jsonObj = nlohmann::json::parse(file, nullptr, false);
     if (jsonObj.is_discarded() || !jsonObj.is_object())
     {
       MITK_ERROR << "Could not parse \"" << jsonPath.toStdString() << "\" as JSON object!";
       return;
     }
     auto num_mods = jsonObj["num_modalities"].get<int>();
     this->ClearAllModalLabels();
     if (num_mods > 1)
     {
       m_Controls.multiModalBox->setChecked(true);
       m_Controls.multiModalBox->setEnabled(false);
       m_Controls.multiModalValueLabel->setText(QString::number(num_mods));
       OnModalitiesNumberChanged(num_mods);
       m_Controls.advancedSettingsLayout->update();
       auto obj = jsonObj["modalities"];
       int count = 0;
       for (const auto &value : obj)
       {
         QLabel *label = new QLabel(QString::fromStdString("<i>" + value.get<std::string>() + "</i>"), this);
         m_ModalLabels.push_back(label);
         m_Controls.advancedSettingsLayout->addWidget(label, m_UI_ROWS + 1 + count, 0);
         count++;
       }
       m_Controls.advancedSettingsLayout->update();
     }
     else
     {
       m_Controls.multiModalBox->setChecked(false);
     }
   }
 }
 
 void QmitknnUNetToolGUI::FillAvailableModelsInfoFromJSON(const QString &jsonPath)
 {
   std::ifstream file(jsonPath.toStdString());
   if (file.is_open() && m_Controls.availableBox->count() < 1)
   {
     auto jsonObj = nlohmann::json::parse(file, nullptr, false);
     if (jsonObj.is_discarded() || !jsonObj.is_object())
     {
       MITK_ERROR << "Could not parse \"" << jsonPath.toStdString() << "\" as JSON object!";
       return;
     }
     for (const auto &obj : jsonObj.items())
     {
       m_Controls.availableBox->addItem(QString::fromStdString(obj.key()));
     }
   }
 }
 
 mitk::ModelParams QmitknnUNetToolGUI::MapToRequest(const QString &modelName,
                                                    const QString &taskName,
                                                    const QString &trainer,
                                                    const QString &planId,
                                                    const std::vector<std::string> &folds)
 {
   mitk::ModelParams requestObject;
   requestObject.model = modelName.toStdString();
   requestObject.trainer = trainer.toStdString();
   requestObject.planId = planId.toStdString();
   requestObject.task = taskName.toStdString();
   requestObject.folds = folds;
   mitk::nnUNetTool::Pointer tool = this->GetConnectedToolAs<mitk::nnUNetTool>();
   requestObject.inputName = tool->GetRefNode()->GetName();
   requestObject.timeStamp =
     std::to_string(mitk::RenderingManager::GetInstance()->GetTimeNavigationController()->GetSelectedTimePoint());
   return requestObject;
 }
 
 void QmitknnUNetToolGUI::SetComboBoxToNone(ctkCheckableComboBox* comboBox)
 {
   comboBox->clear();
   comboBox->addItem("dummy_element_that_nobody_can_see");
   qobject_cast<QListView *>(comboBox->view())->setRowHidden(0, true); // For the cosmetic purpose of showing "None" on the combobox.
 }
 
 /* ---------------------SLOTS---------------------------------------*/
 
 void QmitknnUNetToolGUI::OnPreviewRequested()
 {
   mitk::nnUNetTool::Pointer tool = this->GetConnectedToolAs<mitk::nnUNetTool>();
   if (nullptr != tool)
   {
     QString pythonPathTextItem = "";
     try
     {
       size_t hashKey(0);
       m_Controls.previewButton->setEnabled(false); // To prevent misclicked back2back prediction.
       qApp->processEvents();
       tool->PredictOn(); // purposefully placed to make tool->GetMTime different than before.
       QString modelName = m_Controls.modelBox->currentText();
       if (modelName.startsWith("ensemble", Qt::CaseInsensitive))
       {
         this->ProcessEnsembleModelsParams(tool);
       }
       else
       {
         this->ProcessModelParams(tool);
       }
       pythonPathTextItem = m_Controls.pythonEnvComboBox->currentText();
       QString pythonPath = m_PythonPath;
       if (!this->IsNNUNetInstalled(pythonPath))
       {
         throw std::runtime_error("nnUNet is not detected in the selected python environment. Please select a valid "
                                  "python environment or install nnUNet.");
       }
       tool->SetPythonPath(pythonPath.toStdString());
       tool->SetModelDirectory(m_ParentFolder->getResultsFolder().toStdString());
       // checkboxes
       tool->SetMirror(m_Controls.mirrorBox->isChecked());
       tool->SetMixedPrecision(m_Controls.mixedPrecisionBox->isChecked());
       tool->SetNoPip(false);
       bool doCache = m_Controls.enableCachingCheckBox->isChecked();
       // Spinboxes
       tool->SetGpuId(FetchSelectedGPUFromUI());
       // Multi-Modal
       tool->MultiModalOff();
       if (m_Controls.multiModalBox->isChecked())
       {
         tool->m_OtherModalPaths.clear();
         tool->m_OtherModalPaths = FetchMultiModalImagesFromUI();
         tool->MultiModalOn();
       }
       if (doCache)
       {
         hashKey = nnUNetCache::GetUniqueHash(tool->m_ParamQ);
         if (m_Cache.contains(hashKey))
         {
           tool->PredictOff(); // purposefully placed to make tool->GetMTime different than before.
         }
       }
       if (tool->GetPredict())
       {
         tool->m_InputBuffer = nullptr;
         this->WriteStatusMessage(
           QString("<b>STATUS: </b><i>Starting Segmentation task... This might take a while.</i>"));
         tool->UpdatePreview();
         if (nullptr == tool->GetOutputBuffer())
         {
           this->SegmentationProcessFailed();
         }
         else
         {
           this->SegmentationResultHandler(tool);
           if (doCache)
           {
             this->AddToCache(hashKey, tool->GetOutputBuffer());
           }
           tool->ClearOutputBuffer();
         }
         tool->PredictOff(); // purposefully placed to make tool->GetMTime different than before.
       }
       else
       {
         MITK_INFO << "won't do segmentation. Key found: " << QString::number(hashKey).toStdString();
         if (m_Cache.contains(hashKey))
         {
           nnUNetCache *cacheObject = m_Cache[hashKey];
           MITK_INFO << "fetched pointer " << cacheObject->m_SegCache.GetPointer();
           tool->SetOutputBuffer(const_cast<mitk::LabelSetImage *>(cacheObject->m_SegCache.GetPointer()));
           this->SegmentationResultHandler(tool, true);
         }
       }
       m_Controls.previewButton->setEnabled(true);
     }
     catch (const std::exception &e)
     {
       std::stringstream errorMsg;
       errorMsg << "<b>STATUS: </b>Error while processing parameters for nnUNet segmentation. Reason: " << e.what();
       this->ShowErrorMessage(errorMsg.str());
       this->WriteErrorMessage(QString::fromStdString(errorMsg.str()));
       m_Controls.previewButton->setEnabled(true);
       tool->PredictOff();
       return;
     }
     catch (...)
     {
       std::string errorMsg = "Unkown error occured while generation nnUNet segmentation.";
       this->ShowErrorMessage(errorMsg);
       m_Controls.previewButton->setEnabled(true);
       tool->PredictOff();
       return;
     }
     if (!pythonPathTextItem.isEmpty())
     { // only cache if the prediction ended without errors.
       m_Settings.setValue("nnUNet/LastPythonPath", pythonPathTextItem);
     }
   }
 }
 
 void QmitknnUNetToolGUI::OnRefreshPresssed()
 {
   const QString resultsFolder = m_Controls.modeldirectoryBox->directory();
   this->OnDirectoryChanged(resultsFolder);
 }
 
 void QmitknnUNetToolGUI::OnDirectoryChanged(const QString &resultsFolder)
 {
   m_IsResultsFolderValid = false;
   m_Controls.previewButton->setEnabled(false);
   this->ClearAllComboBoxes();
   this->ClearAllModalities();
   m_ParentFolder = std::make_shared<QmitknnUNetFolderParser>(resultsFolder);
   auto tasks = m_ParentFolder->getAllTasks<QStringList>();
   tasks.removeDuplicates();
   std::for_each(tasks.begin(), tasks.end(), [this](QString task) { m_Controls.taskBox->addItem(task); });
   m_Settings.setValue("nnUNet/LastRESULTS_FOLDERPath", resultsFolder);
 }
 
 void QmitknnUNetToolGUI::OnModelChanged(const QString &model)
 {
   if (model.isEmpty())
   {
     return;
   }
   this->ClearAllModalities();
   auto selectedTask = m_Controls.taskBox->currentText();
   ctkComboBox *box = qobject_cast<ctkComboBox *>(sender());
   if (box == m_Controls.modelBox)
   {
     if (model == m_VALID_MODELS.last())
     {
       m_Controls.trainerBox->setVisible(false);
       m_Controls.trainerLabel->setVisible(false);
       m_Controls.plannerBox->setVisible(false);
       m_Controls.plannerLabel->setVisible(false);
       m_Controls.foldBox->setVisible(false);
       m_Controls.foldLabel->setVisible(false);
       m_Controls.previewButton->setEnabled(false);
       this->ShowEnsembleLayout(true);
       auto models = m_ParentFolder->getModelsForTask<QStringList>(m_Controls.taskBox->currentText());
       models.removeDuplicates();
       models.removeOne(m_VALID_MODELS.last());
       for (auto &layout : m_EnsembleParams)
       {
         layout->modelBox->clear();
         layout->trainerBox->clear();
         layout->plannerBox->clear();
         std::for_each(models.begin(),
                       models.end(),
                       [&layout, this](QString model)
                       {
                         if (m_VALID_MODELS.contains(model, Qt::CaseInsensitive))
                           layout->modelBox->addItem(model);
                       });
       }
     }
     else
     {
       m_Controls.trainerBox->setVisible(true);
       m_Controls.trainerLabel->setVisible(true);
       m_Controls.plannerBox->setVisible(true);
       m_Controls.plannerLabel->setVisible(true);
       m_Controls.foldBox->setVisible(true);
       m_Controls.foldLabel->setVisible(true);
       m_Controls.previewButton->setEnabled(false);
       this->ShowEnsembleLayout(false);
       m_Controls.trainerBox->clear();
       m_Controls.plannerBox->clear();
       auto trainerPlanners = m_ParentFolder->getTrainerPlannersForTask<QStringList>(selectedTask, model);
       if(trainerPlanners.isEmpty())
       {
         this->ShowErrorMessage("No plans.pkl found for "+model.toStdString()+". Check your directory or download the task again.");
         this->SetComboBoxToNone(m_Controls.foldBox);
         return;
       }
       QStringList trainers, planners;
       std::tie(trainers, planners) = ExtractTrainerPlannerFromString(trainerPlanners);
       std::for_each(
         trainers.begin(), trainers.end(), [this](QString trainer) { m_Controls.trainerBox->addItem(trainer); });
       std::for_each(
         planners.begin(), planners.end(), [this](QString planner) { m_Controls.plannerBox->addItem(planner); });
     }
   }
   else if (!m_EnsembleParams.empty())
   { 
     m_Controls.previewButton->setEnabled(false);
     for (auto &layout : m_EnsembleParams)
     {
       if (box == layout->modelBox)
       {
         layout->trainerBox->clear();
         layout->plannerBox->clear();
         auto trainerPlanners = m_ParentFolder->getTrainerPlannersForTask<QStringList>(selectedTask, model);
         if(trainerPlanners.isEmpty())
         {
           this->ShowErrorMessage("No plans.pkl found for "+model.toStdString()+". Check your directory or download the task again.");
           this->SetComboBoxToNone(layout->foldBox);
           return;
         }
         QStringList trainers, planners;
         std::tie(trainers, planners) = ExtractTrainerPlannerFromString(trainerPlanners);
         std::for_each(trainers.begin(),
                       trainers.end(),
                       [&layout](const QString &trainer) { layout->trainerBox->addItem(trainer); });
         std::for_each(planners.begin(),
                       planners.end(),
                       [&layout](const QString &planner) { layout->plannerBox->addItem(planner); });
         break;
       }
     }
   }
 }
 
 void QmitknnUNetToolGUI::OnTaskChanged(const QString &task)
 {
   if (task.isEmpty())
   {
     return;
   }
   m_Controls.modelBox->clear();
   auto models = m_ParentFolder->getModelsForTask<QStringList>(task);
   models.removeDuplicates();
   if (!models.contains(m_VALID_MODELS.last(), Qt::CaseInsensitive))
   {
     models << m_VALID_MODELS.last(); // add ensemble even if folder doesn't exist
   }
   std::for_each(models.begin(),
                 models.end(),
                 [this](QString model)
                 {
                   if (m_VALID_MODELS.contains(model, Qt::CaseInsensitive))
                     m_Controls.modelBox->addItem(model);
                 });
 }
 
 void QmitknnUNetToolGUI::OnTrainerChanged(const QString &plannerSelected)
 {
   if (plannerSelected.isEmpty())
   {
     return;
   }
   m_IsResultsFolderValid = false;
   QString parentPath;
   auto *box = qobject_cast<ctkComboBox *>(sender());
   if (box == m_Controls.plannerBox)
   {
     m_Controls.foldBox->clear();
     auto selectedTrainer = m_Controls.trainerBox->currentText();
     auto selectedTask = m_Controls.taskBox->currentText();
     auto selectedModel = m_Controls.modelBox->currentText();
     auto folds = m_ParentFolder->getFoldsForTrainerPlanner<QStringList>(
       selectedTrainer, plannerSelected, selectedTask, selectedModel);
     if(folds.isEmpty())
     {
       this->ShowErrorMessage("No valid folds found. Check your directory or download the task again.");
       this->SetComboBoxToNone(m_Controls.foldBox);
       return;
     }
     std::for_each(folds.begin(),
                   folds.end(),
                   [this](QString fold)
                   {
                     if (fold.startsWith("fold_", Qt::CaseInsensitive)) // imposed by nnUNet
                       m_Controls.foldBox->addItem(fold);
                   });
     if (m_Controls.foldBox->count() != 0)
     {
       m_IsResultsFolderValid = true;
       this->CheckAllInCheckableComboBox(m_Controls.foldBox);
       auto tempPath = QStringList() << m_ParentFolder->getResultsFolder() << "nnUNet" << selectedModel << selectedTask
                                     << QString("%1__%2").arg(selectedTrainer, plannerSelected);
       parentPath = QDir::cleanPath(tempPath.join(QDir::separator()));
     }
   }
   else if (!m_EnsembleParams.empty())
   {
     for (auto &layout : m_EnsembleParams)
     {
       if (box == layout->plannerBox)
       {
         layout->foldBox->clear();
         auto selectedTrainer = layout->trainerBox->currentText();
         auto selectedTask = m_Controls.taskBox->currentText();
         auto selectedModel = layout->modelBox->currentText();
         auto folds = m_ParentFolder->getFoldsForTrainerPlanner<QStringList>(
           selectedTrainer, plannerSelected, selectedTask, selectedModel);
         if(folds.isEmpty())
         {
           this->ShowErrorMessage("No valid folds found. Check your directory.");
           this->SetComboBoxToNone(layout->foldBox);
           return;
         }
         std::for_each(folds.begin(),
                       folds.end(),
                       [&layout](const QString &fold)
                       {
                         if (fold.startsWith("fold_", Qt::CaseInsensitive)) // imposed by nnUNet
                           layout->foldBox->addItem(fold);
                       });
         if (layout->foldBox->count() != 0)
         {
           this->CheckAllInCheckableComboBox(layout->foldBox);
           m_IsResultsFolderValid = true;
           auto tempPath = QStringList() << m_ParentFolder->getResultsFolder() << "nnUNet" << selectedModel
                                         << selectedTask << QString("%1__%2").arg(selectedTrainer, plannerSelected);
           parentPath = QDir::cleanPath(tempPath.join(QDir::separator()));
         }
         break;
       }
     }
   }
   if (m_IsResultsFolderValid)
   {
     m_Controls.previewButton->setEnabled(true);
     const QString mitkJsonFile = parentPath + QDir::separator() + m_MITK_EXPORT_JSON_FILENAME;
     this->DumpJSONfromPickle(parentPath);
     if (QFile::exists(mitkJsonFile))
     {
       this->DisplayMultiModalInfoFromJSON(mitkJsonFile);
     }
   }
 }
 
 void QmitknnUNetToolGUI::OnPythonPathChanged(const QString &pyEnv)
 {
   if (pyEnv == QString("Select"))
   {
     QString path =
       QFileDialog::getExistingDirectory(m_Controls.pythonEnvComboBox->parentWidget(), "Python Path", "dir");
     if (!path.isEmpty())
     {
       this->OnPythonPathChanged(path); // recall same function for new path validation
       m_Controls.pythonEnvComboBox->insertItem(0, path);
       m_Controls.pythonEnvComboBox->setCurrentIndex(0);
     }
   }
   else if (!this->IsNNUNetInstalled(pyEnv))
   {
     std::string warning =
       "WARNING: nnUNet is not detected on the Python environment you selected. Please select another "
       "environment or create one. For more info refer https://github.com/MIC-DKFZ/nnUNet";
     this->ShowErrorMessage(warning);
     this->DisableEverything();
     m_Controls.availableBox->clear();
   }
   else
   {
     m_Controls.modeldirectoryBox->setEnabled(true);
     m_Controls.refreshdirectoryBox->setEnabled(true);
     m_Controls.multiModalBox->setEnabled(true);
     QString setVal = this->FetchResultsFolderFromEnv();
     if (!setVal.isEmpty())
     {
       m_Controls.modeldirectoryBox->setDirectory(setVal);
     }
     this->OnRefreshPresssed();
     m_PythonPath = pyEnv.mid(pyEnv.indexOf(" ") + 1);
+#ifdef _WIN32
+    if (!(m_PythonPath.endsWith("Scripts", Qt::CaseInsensitive) || m_PythonPath.endsWith("Scripts/", Qt::CaseInsensitive)))
+    {
+      m_PythonPath += QDir::separator() + QString("Scripts");
+    }
+#else
     if (!(m_PythonPath.endsWith("bin", Qt::CaseInsensitive) || m_PythonPath.endsWith("bin/", Qt::CaseInsensitive)))
     {
       m_PythonPath += QDir::separator() + QString("bin");
     }
-    
+#endif
     // Export available model info as json and fill them for Download
     QString tempPath = QString::fromStdString(mitk::IOUtil::GetTempPath());
     this->ExportAvailableModelsAsJSON(tempPath);
     const QString jsonPath = tempPath + QDir::separator() + m_AVAILABLE_MODELS_JSON_FILENAME;
     if (QFile::exists(jsonPath))
     {
       this->FillAvailableModelsInfoFromJSON(jsonPath);
     }
   }
 }
 
 void QmitknnUNetToolGUI::OnCheckBoxChanged(int state)
 {
   bool visibility = false;
   if (state == Qt::Checked)
   {
     visibility = true;
   }
   ctkCheckBox *box = qobject_cast<ctkCheckBox *>(sender());
   if (box != nullptr)
   {
     if (box->objectName() == QString("multiModalBox"))
     {
       m_Controls.requiredModalitiesLabel->setVisible(visibility);
       m_Controls.multiModalValueLabel->setVisible(visibility);
       if (!visibility)
       {
         this->OnModalitiesNumberChanged(0);
         m_Controls.multiModalValueLabel->setText("0");
         this->ClearAllModalLabels();
       }
     }
   }
 }
 
 void QmitknnUNetToolGUI::OnModalitiesNumberChanged(int num)
 {
   while (num > static_cast<int>(m_Modalities.size()))
   {
-    QmitkDataStorageComboBox *multiModalBox = new QmitkDataStorageComboBox(this, true);
+    QmitkSingleNodeSelectionWidget *multiModalBox = new QmitkSingleNodeSelectionWidget(this);
     mitk::nnUNetTool::Pointer tool = this->GetConnectedToolAs<mitk::nnUNetTool>();
     multiModalBox->SetDataStorage(tool->GetDataStorage());
-    multiModalBox->SetPredicate(m_MultiModalPredicate);
+    multiModalBox->SetInvalidInfo("Select corresponding modalities");
+    multiModalBox->SetNodePredicate(m_MultiModalPredicate);
     multiModalBox->setObjectName(QString("multiModal_" + QString::number(m_Modalities.size() + 1)));
     m_Controls.advancedSettingsLayout->addWidget(multiModalBox, m_UI_ROWS + m_Modalities.size() + 1, 1, 1, 3);
     m_Modalities.push_back(multiModalBox);
   }
   while (num < static_cast<int>(m_Modalities.size()) && !m_Modalities.empty())
   {
-    QmitkDataStorageComboBox *child = m_Modalities.back();
+    QmitkSingleNodeSelectionWidget *child = m_Modalities.back();
     delete child; // delete the layout item
     m_Modalities.pop_back();
   }
   m_Controls.advancedSettingsLayout->update();
 }
 
 void QmitknnUNetToolGUI::AutoParsePythonPaths()
 {
   QString homeDir = QDir::homePath();
   std::vector<QString> searchDirs;
 #ifdef _WIN32
   searchDirs.push_back(QString("C:") + QDir::separator() + QString("ProgramData") + QDir::separator() +
                        QString("anaconda3"));
 #else
   // Add search locations for possible standard python paths here
   searchDirs.push_back(homeDir + QDir::separator() + "environments");
   searchDirs.push_back(homeDir + QDir::separator() + "anaconda3");
   searchDirs.push_back(homeDir + QDir::separator() + "miniconda3");
   searchDirs.push_back(homeDir + QDir::separator() + "opt" + QDir::separator() + "miniconda3");
   searchDirs.push_back(homeDir + QDir::separator() + "opt" + QDir::separator() + "anaconda3");
 #endif
   for (QString searchDir : searchDirs)
   {
     if (searchDir.endsWith("anaconda3", Qt::CaseInsensitive))
     {
       if (QDir(searchDir).exists())
       {
         m_Controls.pythonEnvComboBox->insertItem(0, "(base): " + searchDir);
         searchDir.append((QDir::separator() + QString("envs")));
       }
     }
     for (QDirIterator subIt(searchDir, QDir::AllDirs, QDirIterator::NoIteratorFlags); subIt.hasNext();)
     {
       subIt.next();
       QString envName = subIt.fileName();
       if (!envName.startsWith('.')) // Filter out irrelevent hidden folders, if any.
       {
         m_Controls.pythonEnvComboBox->insertItem(0, "(" + envName + "): " + subIt.filePath());
       }
     }
   }
   m_Controls.pythonEnvComboBox->setCurrentIndex(-1);
 }
 
 void QmitknnUNetToolGUI::SegmentationProcessFailed()
 {
   this->WriteErrorMessage(
     "<b>STATUS: </b><i>Error in the segmentation process. <br>No resulting segmentation can be loaded.</i>");
   this->setCursor(Qt::ArrowCursor);
   std::stringstream stream;
   stream << "Error in the segmentation process. No resulting segmentation can be loaded.";
   this->ShowErrorMessage(stream.str());
 }
 
 void QmitknnUNetToolGUI::SegmentationResultHandler(mitk::nnUNetTool *tool, bool forceRender)
 {
   if (forceRender)
   {
     tool->RenderOutputBuffer();
   }
   m_FirstPreviewComputation = false;
   this->SetLabelSetPreview(tool->GetPreviewSegmentation());
   this->WriteStatusMessage("<b>STATUS: </b><i>Segmentation task finished successfully.</i>");
   this->ActualizePreviewLabelVisibility();
 }
 
 void QmitknnUNetToolGUI::ShowEnsembleLayout(bool visible)
 {
   if (m_EnsembleParams.empty())
   {
     ctkCollapsibleGroupBox *groupBoxModel1 = new ctkCollapsibleGroupBox(this);
     auto lay1 = std::make_unique<QmitknnUNetTaskParamsUITemplate>(groupBoxModel1);
     groupBoxModel1->setObjectName(QString::fromUtf8("model_1_Box"));
     groupBoxModel1->setTitle(QString::fromUtf8("Model 1"));
     groupBoxModel1->setMinimumSize(QSize(0, 0));
     groupBoxModel1->setCollapsedHeight(5);
     groupBoxModel1->setCollapsed(false);
     groupBoxModel1->setFlat(true);
     groupBoxModel1->setAlignment(Qt::AlignRight);
     m_Controls.advancedSettingsLayout->addWidget(groupBoxModel1, 5, 0, 1, 2);
 
     connect(lay1->modelBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnModelChanged(const QString &)));
     connect(
       lay1->plannerBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnTrainerChanged(const QString &)));
     m_EnsembleParams.push_back(std::move(lay1));
 
     ctkCollapsibleGroupBox *groupBoxModel2 = new ctkCollapsibleGroupBox(this);
     auto lay2 = std::make_unique<QmitknnUNetTaskParamsUITemplate>(groupBoxModel2);
     groupBoxModel2->setObjectName(QString::fromUtf8("model_2_Box"));
     groupBoxModel2->setTitle(QString::fromUtf8("Model 2"));
     groupBoxModel2->setMinimumSize(QSize(0, 0));
     groupBoxModel2->setCollapsedHeight(5);
     groupBoxModel2->setCollapsed(false);
     groupBoxModel2->setFlat(true);
     groupBoxModel2->setAlignment(Qt::AlignLeft);
     m_Controls.advancedSettingsLayout->addWidget(groupBoxModel2, 5, 2, 1, 2);
 
     connect(lay2->modelBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnModelChanged(const QString &)));
     connect(
       lay2->plannerBox, SIGNAL(currentTextChanged(const QString &)), this, SLOT(OnTrainerChanged(const QString &)));
     m_EnsembleParams.push_back(std::move(lay2));
   }
   for (auto &layout : m_EnsembleParams)
   {
     layout->setVisible(visible);
   }
 }
 
 void QmitknnUNetToolGUI::OnDownloadModel()
 {
   auto selectedTask = m_Controls.availableBox->currentText();
   if(!selectedTask.isEmpty())
   {
     auto spExec = mitk::ProcessExecutor::New();
     mitk::ProcessExecutor::ArgumentListType args;
     args.push_back(selectedTask.toStdString());
     this->WriteStatusMessage(
       "Downloading the requested task in to the selected Results Folder. This might take some time "
       "depending on your internet connection...");
     m_Processes["DOWNLOAD"] = spExec;
     if (!m_nnUNetThread->isRunning())
     {
       MITK_DEBUG << "Starting thread...";
       m_nnUNetThread->start();
     }
     QString resultsFolder = m_ParentFolder->getResultsFolder();
     emit Operate(resultsFolder, m_PythonPath, spExec, args);
     m_Controls.stopDownloadButton->setVisible(true);
     m_Controls.startDownloadButton->setVisible(false);
   }
 }
 
 void QmitknnUNetToolGUI::OnDownloadWorkerExit(const bool isSuccess, const QString message)
 {
   if (isSuccess)
   {
     this->WriteStatusMessage(message + QString(" Click Refresh Results Folder to use the new Task."));
   }
   else
   {
     MITK_ERROR << "Download FAILED! " << message.toStdString();
     this->WriteStatusMessage(QString("Download failed. Check your internet connection. " + message));
   }
   m_Controls.stopDownloadButton->setVisible(false);
   m_Controls.startDownloadButton->setVisible(true);
 }
 
 void QmitknnUNetToolGUI::OnStopDownload()
 {
   mitk::ProcessExecutor::Pointer spExec = m_Processes["DOWNLOAD"];
   spExec->KillProcess();
   this->WriteStatusMessage("Download Killed by the user.");
   m_Controls.stopDownloadButton->setVisible(false);
   m_Controls.startDownloadButton->setVisible(true);
 }
 
 void QmitknnUNetToolGUI::OnClearCachePressed()
 {
   m_Cache.clear();
   this->UpdateCacheCountOnUI();
 }
diff --git a/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.h b/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.h
index b590ac2f82..0d4f016f35 100644
--- a/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.h
+++ b/Modules/SegmentationUI/Qmitk/QmitknnUNetToolGUI.h
@@ -1,405 +1,405 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 #ifndef QmitknnUNetToolGUI_h
 #define QmitknnUNetToolGUI_h
 
 #include "QmitkMultiLabelSegWithPreviewToolGUIBase.h"
 #include "QmitknnUNetFolderParser.h"
 #include "QmitknnUNetGPU.h"
 #include "QmitknnUNetWorker.h"
 #include "mitkProcessExecutor.h"
 #include "mitknnUnetTool.h"
 #include "ui_QmitknnUNetToolGUIControls.h"
 #include <MitkSegmentationUIExports.h>
 #include <QCache>
 #include <QMessageBox>
 #include <QSettings>
 #include <QThread>
-#include <QmitkDataStorageComboBox.h>
+#include <QmitkSingleNodeSelectionWidget.h>
 #include <QmitknnUNetEnsembleLayout.h>
 #include <boost/functional/hash.hpp>
 #include <unordered_map>
 
 class nnUNetCache
 {
 public:
   mitk::LabelSetImage::ConstPointer m_SegCache;
   static size_t GetUniqueHash(std::vector<mitk::ModelParams> &requestQ)
   {
     size_t hashCode = 0;
     for (mitk::ModelParams &request : requestQ)
     {
       boost::hash_combine(hashCode, request.generateHash());
     }
     return hashCode;
   }
 };
 
 class MITKSEGMENTATIONUI_EXPORT QmitknnUNetToolGUI : public QmitkMultiLabelSegWithPreviewToolGUIBase
 {
   Q_OBJECT
 
 public:
   mitkClassMacro(QmitknnUNetToolGUI, QmitkMultiLabelSegWithPreviewToolGUIBase);
   itkFactorylessNewMacro(Self);
   itkCloneMacro(Self);
 
   QCache<size_t, nnUNetCache> m_Cache;
 
   /**
    * @brief The hash map stores all bifurcating processes' ID.
    *
    */
   std::unordered_map<std::string, mitk::ProcessExecutor::Pointer> m_Processes;
 
 protected slots:
 
   /**
    * @brief Qt slot
    *
    */
   void OnPreviewRequested();
 
   /**
    * @brief Qt slot
    *
    */
   void OnDirectoryChanged(const QString&);
 
   /**
    * @brief Qt slot
    *
    */
   void OnModelChanged(const QString&);
 
   /**
    * @brief Qt slot
    *
    */
   void OnTaskChanged(const QString &);
 
   /**
    * @brief Qt slot
    *
    */
   void OnTrainerChanged(const QString&);
 
   /**
    * @brief Qt slot
    *
    */
   void OnCheckBoxChanged(int);
 
   /**
    * @brief Qthread slot to capture failures from thread worker and
    * shows error message
    *
    */
   void SegmentationProcessFailed();
 
   /**
    * @brief Qthread to capture sucessfull nnUNet segmentation.
    * Further, renders the LabelSet image
    */
   void SegmentationResultHandler(mitk::nnUNetTool *, bool forceRender = false);
 
   /**
    * @brief Qt Slot
    *
    */
   void OnModalitiesNumberChanged(int);
 
   /**
    * @brief Qt Slot
    *
    */
   void OnPythonPathChanged(const QString&);
 
   /**
    * @brief Qt slot
    *
    */
   void OnRefreshPresssed();
 
   /**
    * @brief Qt slot
    *
    */
   void OnClearCachePressed();
 
   /**
    * @brief Qt slot
    *
    */
   void OnDownloadModel();
 
   /**
    * @brief Qt slot
    *
    */
   void OnDownloadWorkerExit(bool, const QString);
 
   /**
    * @brief Qt slot
    *
    */
   void OnStopDownload();
 
 signals:
   /**
    * @brief signal for starting the segmentation which is caught by a worker thread.
    */
   void Operate(QString, QString, mitk::ProcessExecutor::Pointer, mitk::ProcessExecutor::ArgumentListType);
 
 protected:
   QmitknnUNetToolGUI();
   ~QmitknnUNetToolGUI();
 
   void ConnectNewTool(mitk::SegWithPreviewTool* newTool) override;
   void InitializeUI(QBoxLayout* mainLayout) override;
   void EnableWidgets(bool enabled) override;
 
 private:
   /**
   * @brief Adds an element and hides it so that the ctkCheckableComboBox shows "None".
   */
   void SetComboBoxToNone(ctkCheckableComboBox*);
 
   /**
    * @brief Parses the available_models.json file from RESULTS_FOLDER and loads
    * the task names to the Download combobox in Advanced.
    */
   void FillAvailableModelsInfoFromJSON(const QString&);
 
   /**
    * @brief Exports available models to download from nnUNet_print_available_pretrained_models
    * output.
    */
   void ExportAvailableModelsAsJSON(const QString&);
 
   /**
    * @brief Clears all displayed modal labels and widgets from GUI.
    *
    */
   void ClearAllModalities();
 
   /**
    * @brief Parses Json file containing modality info and populates
    * labels and selection widgets accordingly on the GUI.
    */
   void DisplayMultiModalInfoFromJSON(const QString&);
 
   /**
    * @brief Clears all modality labels previously populated from GUI.
    *
    */
   void ClearAllModalLabels();
 
   /**
    * @brief Runs a set of python commands to read "plans.pkl" and extract
    * modality information required for inferencing. This information is exported
    * as json file : "mitk_export.json".
    *
    * @return QString
    */
   void DumpJSONfromPickle(const QString&);
 
   /**
    * @brief Searches RESULTS_FOLDER environment variable. If not found,
    * returns from the QSettings stored last used path value.
    * @return QString
    */
   QString FetchResultsFolderFromEnv();
 
   /**
    * @brief Returns GPU id of the selected GPU from the Combo box.
    *
    * @return unsigned int
    */
   unsigned int FetchSelectedGPUFromUI();
 
   /**
    * @brief Adds GPU information to the gpu combo box.
    * In case, there aren't any GPUs avaialble, the combo box will be
    * rendered editable.
    */
   void SetGPUInfo();
 
   /**
    * @brief Inserts the hash and segmentation into cache and
    * updates count on UI.
    */
   void AddToCache(size_t&, mitk::LabelSetImage::ConstPointer);
 
   /**
    * @brief Checks all the entries of the ctkCheckableComboBox ui widget.
    * This feature is not present in ctkCheckableComboBox API.
    */
   void CheckAllInCheckableComboBox(ctkCheckableComboBox*);
 
   /**
    * @brief Parses the folder names containing trainer and planner together and,
    * returns it as separate lists.
    * @return std::pair<QStringList, QStringList>
    */
 
   std::pair<QStringList, QStringList> ExtractTrainerPlannerFromString(QStringList);
   /**
    * @brief Parses the ensemble UI elements and sets to nnUNetTool object pointer.
    *
    */
   void ProcessEnsembleModelsParams(mitk::nnUNetTool::Pointer);
 
   /**
    * @brief Parses the UI elements and sets to nnUNetTool object pointer.
    *
    */
   void ProcessModelParams(mitk::nnUNetTool::Pointer);
 
   /**
    * @brief Creates and renders QmitknnUNetTaskParamsUITemplate layout for ensemble input.
    */
   void ShowEnsembleLayout(bool visible = true);
 
   /**
    * @brief Creates a QMessage object and shows on screen.
    */
   void ShowErrorMessage(const std::string&, QMessageBox::Icon = QMessageBox::Critical);
 
   /**
    * @brief Writes any message in white on the tool pane.
    */
   void WriteStatusMessage(const QString&);
 
   /**
    * @brief Writes any message in red on the tool pane.
    */
   void WriteErrorMessage(const QString&);
 
   /**
    * @brief Searches and parses paths of python virtual enviroments
    * from predefined lookout locations
    */
   void AutoParsePythonPaths();
 
   /**
    * @brief Check if pretrained model sub folder inside RESULTS FOLDER exist.
    */
   bool IsModelExists(const QString&, const QString&, const QString&);
 
   /**
    * @brief Clears all combo boxes
    * Any new combo box added in the future can be featured here for clearance.
    *
    */
   void ClearAllComboBoxes();
 
   /**
    * @brief Disable/deactivates the nnUNet GUI.
    * Clears any multi modal labels and selection widgets, as well.
    */
   void DisableEverything();
 
   /**
    * @brief Checks if nnUNet_predict command is valid in the selected python virtual environment.
    *
    * @return bool
    */
   bool IsNNUNetInstalled(const QString&);
 
   /**
    * @brief Mapper function to map QString entries from UI to ModelParam attributes.
    *
    * @return mitk::ModelParams
    */
   mitk::ModelParams MapToRequest(
     const QString&, const QString&, const QString&, const QString&, const std::vector<std::string>&);
 
   /**
    * @brief Returns checked fold names from the ctk-Checkable-ComboBox.
    *
    * @return std::vector<std::string>
    */
   std::vector<std::string> FetchSelectedFoldsFromUI(ctkCheckableComboBox*);
 
   /**
    * @brief Returns all paths from the dynamically generated ctk-path-line-edit boxes.
    *
    * @return std::vector<std::string>
    */
   std::vector<mitk::Image::ConstPointer> FetchMultiModalImagesFromUI();
 
   /**
    * @brief Updates cache count on UI.
    *
    */
   void UpdateCacheCountOnUI();
 
   Ui_QmitknnUNetToolGUIControls m_Controls;
   QmitkGPULoader m_GpuLoader;
 
   /**
    * @brief Stores all dynamically added ctk-path-line-edit UI elements.
    *
    */
-  std::vector<QmitkDataStorageComboBox*> m_Modalities;
+  std::vector<QmitkSingleNodeSelectionWidget*> m_Modalities;
   std::vector<QLabel*> m_ModalLabels;
 
   std::vector<std::unique_ptr<QmitknnUNetTaskParamsUITemplate>> m_EnsembleParams;
 
   mitk::NodePredicateBase::Pointer m_MultiModalPredicate;
 
   QString m_PythonPath;
 
   /**
    * @brief Stores row count of the "advancedSettingsLayout" layout element. This value helps dynamically add
    * ctk-path-line-edit UI elements at the right place. Forced to initialize in the InitializeUI method since there is
    * no guarantee of retrieving exact row count anywhere else.
    *
    */
   int m_UI_ROWS;
 
   /**
    * @brief Stores path of the model director (RESULTS_FOLDER appended by "nnUNet").
    *
    */
   std::shared_ptr<QmitknnUNetFolderParser> m_ParentFolder = nullptr;
 
   /**
    * @brief Valid list of models supported by nnUNet
    *
    */
   const QStringList m_VALID_MODELS = {"2d", "3d_lowres", "3d_fullres", "3d_cascade_fullres", "ensembles"};
 
   const QString m_CACHE_COUNT_BASE_LABEL = "Cached Items: ";
 
   const QString m_MITK_EXPORT_JSON_FILENAME = "mitk_export.json";
 
   const QString m_AVAILABLE_MODELS_JSON_FILENAME = "available_models.json";
 
   const QString m_PICKLE_FILENAME = "plans.pkl";
 
   /**
    * @brief For storing values across sessions. Currently, RESULTS_FOLDER value is cached using this.
    */
   QSettings m_Settings;
 
   bool m_IsResultsFolderValid = false;
 
   QThread* m_nnUNetThread;
   nnUNetDownloadWorker* m_Worker;
   
   bool m_FirstPreviewComputation = true;
   EnableConfirmSegBtnFunctionType m_SuperclassEnableConfirmSegBtnFnc;
 };
 #endif