diff --git a/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.cpp b/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.cpp
index 324954e4c1..1d6c97c287 100644
--- a/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.cpp
+++ b/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.cpp
@@ -1,69 +1,85 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "mitkUSTelemedImageSource.h"
 #include "mitkUSTelemedSDKHeader.h"
 #include "MITKUSTelemedScanConverterPlugin.h"
 #include "mitkImageReadAccessor.h"
 
 mitk::USTelemedImageSource::USTelemedImageSource(  )
-  : m_Image(mitk::Image::New()), m_Plugin(0), m_PluginCallback(0)
+  : m_Image(mitk::Image::New()),
+    m_ImageMutex(itk::FastMutexLock::New()),
+    m_Plugin(0),
+    m_PluginCallback(0)
 {
 }
 
 mitk::USTelemedImageSource::~USTelemedImageSource( )
 {
-  SAFE_RELEASE(m_Plugin);
   SAFE_RELEASE(m_PluginCallback);
+  SAFE_RELEASE(m_Plugin);
 }
 
 void mitk::USTelemedImageSource::GetNextRawImage( mitk::Image::Pointer& image)
 {
   if ( image.IsNull() ) { image = mitk::Image::New(); }
   if ( m_Image->IsInitialized() )
   {
+    m_ImageMutex->Lock();
+
     // copy contents of the given image into the member variable
     image->Initialize(m_Image->GetPixelType(), m_Image->GetDimension(), m_Image->GetDimensions());
     mitk::ImageReadAccessor inputReadAccessor(m_Image, m_Image->GetSliceData(0,0,0));
     image->SetSlice(inputReadAccessor.GetData());
+
+    m_ImageMutex->Unlock();
   }
 }
 
 bool mitk::USTelemedImageSource::CreateAndConnectConverterPlugin(Usgfw2Lib::IUsgDataView* usgDataView, Usgfw2Lib::tagScanMode scanMode)
 {
   IUnknown* tmp_obj = NULL;
 
   // create control object from Telemed API
   mitk::telemed::CreateUsgControl( usgDataView, Usgfw2Lib::IID_IUsgScanConverterPlugin, scanMode, 0, (void**)&tmp_obj );
   if ( ! tmp_obj )
   {
     MITK_ERROR("USImageSource")("USTelemedImageSource") << "Could not create scan converter plugin.";
     return false;
   }
 
-  SAFE_RELEASE(m_Plugin);
-  m_Plugin = (Usgfw2Lib::IUsgScanConverterPlugin*)tmp_obj;
+  // create the callback object for the scan conversion
+  if ( ! m_PluginCallback )
+  {
+    m_PluginCallback = new USTelemedScanConverterPlugin();
+
+    // current image buffer should be copied to m_Image at every callback
+    m_PluginCallback->SetOutputImage(m_Image.GetPointer(), m_ImageMutex);
+  }
+  else
+  {
+    // make sure that the scan converter plugin is not set
+    // to the plugin callback any longer
+    m_PluginCallback->SetScanConverterPlugin(0);
+  }
 
   // now the ScanConverterPlugin can be created and set as plugin
-  SAFE_RELEASE(m_PluginCallback);
-  m_PluginCallback = new USTelemedScanConverterPlugin();
+  SAFE_RELEASE(m_Plugin);
+  m_Plugin = (Usgfw2Lib::IUsgScanConverterPlugin*)tmp_obj;
   m_PluginCallback->SetScanConverterPlugin(m_Plugin);
 
-  // current image buffer should be copied to m_Image at every callback
-  m_PluginCallback->SetOutputImage(m_Image.GetPointer());
-
   return true;
 }
\ No newline at end of file
diff --git a/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.h b/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.h
index a0d8c2f1a0..e6f9dde4f0 100644
--- a/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.h
+++ b/Modules/US/USHardwareTelemed/mitkUSTelemedImageSource.h
@@ -1,64 +1,67 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #ifndef MITKUSTelemedImageSource_H_HEADER_INCLUDED_
 #define MITKUSTelemedImageSource_H_HEADER_INCLUDED_
 
 #include "mitkUSImageSource.h"
 #include "mitkUSTelemedSDKHeader.h"
 #include "mitkUSTelemedScanConverterPlugin.h"
 
+#include "itkFastMutexLock.h"
+
 namespace mitk {
 /**
   * \brief Implementation of mitk::USImageSource for Telemed API devices.
   * The method mitk::USImageSource::GetNextRawImage() is implemented for
   * getting images from the Telemed API.
   *
   * A method for connecting this ImageSource to the Telemed API is
   * implemented (mitk::USTelemedImageSource::CreateAndConnectConverterPlugin()).
   * This method is available for being used by mitk::USTelemedDevice.
   */
 class USTelemedImageSource : public USImageSource
 {
 public:
   mitkClassMacro(USTelemedImageSource, USImageSource);
   itkFactorylessNewMacro(Self)
   itkCloneMacro(Self)
 
   /**
     * Implementation of the superclass method. Returns the pointer
     * to the mitk::Image filled by Telemed API callback.
     */
   virtual void GetNextRawImage( mitk::Image::Pointer& );
 
   /**
     * \brief Connect this object to the Telemed API.
     * This method is for being used by mitk::USTelemedDevice.
     */
   bool CreateAndConnectConverterPlugin( Usgfw2Lib::IUsgDataView*, Usgfw2Lib::tagScanMode );
 
 protected:
   USTelemedImageSource( );
   virtual ~USTelemedImageSource( );
 
   Usgfw2Lib::IUsgScanConverterPlugin*         m_Plugin;
   USTelemedScanConverterPlugin*               m_PluginCallback;
 
   mitk::Image::Pointer                        m_Image;
+  itk::FastMutexLock::Pointer                 m_ImageMutex;
 };
 } // namespace mitk
 
 #endif // MITKUSTelemedImageSource_H