diff --git a/Modules/ModelFit/src/Models/mitkExponentialDecayModel.cpp b/Modules/ModelFit/src/Models/mitkExponentialDecayModel.cpp
index 50fad51011..025fea430c 100644
--- a/Modules/ModelFit/src/Models/mitkExponentialDecayModel.cpp
+++ b/Modules/ModelFit/src/Models/mitkExponentialDecayModel.cpp
@@ -1,218 +1,217 @@
 /*============================================================================
 
 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 "mitkExponentialDecayModel.h"
 #include "mitkNumericConstants.h"
 
 const std::string mitk::ExponentialDecayModel::NAME_PARAMETER_y0 = "y-intercept";
 const std::string mitk::ExponentialDecayModel::NAME_PARAMETER_lambda = "lambda";
 
 const unsigned int mitk::ExponentialDecayModel::NUMBER_OF_PARAMETERS = 2;
 
 const std::string mitk::ExponentialDecayModel::UNIT_PARAMETER_y0 = "[unit of y]";
 const std::string mitk::ExponentialDecayModel::UNIT_PARAMETER_lambda = "[unit of x]";
 
 const unsigned int mitk::ExponentialDecayModel::POSITION_PARAMETER_y0 = 0;
 const unsigned int mitk::ExponentialDecayModel::POSITION_PARAMETER_lambda = 1;
 
 const std::string mitk::ExponentialDecayModel::NAME_DERIVED_PARAMETER_k = "rate";
 
 const unsigned int mitk::ExponentialDecayModel::NUMBER_OF_DERIVED_PARAMETERS = 1;
 
 const std::string mitk::ExponentialDecayModel::UNIT_DERIVED_PARAMETER_k = "1/[unit of x]";
 
 const unsigned int mitk::ExponentialDecayModel::NUMBER_OF_STATIC_PARAMETERS = 0;
 
 const std::string mitk::ExponentialDecayModel::MODEL_DISPLAY_NAME = "Exponential Decay Model";
 
 const std::string mitk::ExponentialDecayModel::MODEL_TYPE = "Generic";
 
 const std::string mitk::ExponentialDecayModel::FUNCTION_STRING = "y(x) = y-intercept * exp(-x/lambda)";
 
 const std::string mitk::ExponentialDecayModel::X_NAME = "x";
 
 const std::string mitk::ExponentialDecayModel::X_AXIS_NAME = "X";
 
 const std::string mitk::ExponentialDecayModel::X_AXIS_UNIT = "unit of x";
 
 const std::string mitk::ExponentialDecayModel::Y_AXIS_NAME = "Y";
 
 const std::string mitk::ExponentialDecayModel::Y_AXIS_UNIT = "unit of y";
 
 
 std::string mitk::ExponentialDecayModel::GetModelDisplayName() const
 {
   return MODEL_DISPLAY_NAME;
 };
 
 std::string mitk::ExponentialDecayModel::GetModelType() const
 {
   return MODEL_TYPE;
 };
 
 mitk::ExponentialDecayModel::FunctionStringType mitk::ExponentialDecayModel::GetFunctionString() const
 {
   return FUNCTION_STRING;
 };
 
 std::string mitk::ExponentialDecayModel::GetXName() const
 {
   return X_NAME;
 };
 
 std::string mitk::ExponentialDecayModel::GetXAxisName() const
 {
   return X_AXIS_NAME;
 };
 
 std::string mitk::ExponentialDecayModel::GetXAxisUnit() const
 {
   return X_AXIS_UNIT;
 }
 
 std::string mitk::ExponentialDecayModel::GetYAxisName() const
 {
   return Y_AXIS_NAME;
 };
 
 std::string mitk::ExponentialDecayModel::GetYAxisUnit() const
 {
   return Y_AXIS_UNIT;
 }
 
 mitk::ExponentialDecayModel::ParameterNamesType
 mitk::ExponentialDecayModel::GetParameterNames() const
 {
   ParameterNamesType result;
   result.push_back(NAME_PARAMETER_y0);
   result.push_back(NAME_PARAMETER_lambda);
   return result;
 };
 
 mitk::ExponentialDecayModel::ParamterUnitMapType mitk::ExponentialDecayModel::GetParameterUnits() const
 {
   ParamterUnitMapType result;
 
   result.insert(std::make_pair(NAME_PARAMETER_y0, UNIT_PARAMETER_y0));
   result.insert(std::make_pair(NAME_PARAMETER_lambda, UNIT_PARAMETER_lambda));
 
   return result;
 }
 
 mitk::ExponentialDecayModel::ParametersSizeType
 mitk::ExponentialDecayModel::GetNumberOfParameters() const
 {
   return NUMBER_OF_PARAMETERS;
 };
 
 mitk::ExponentialDecayModel::ParameterNamesType
 mitk::ExponentialDecayModel::GetDerivedParameterNames() const
 {
   ParameterNamesType result;
   result.push_back(NAME_DERIVED_PARAMETER_k);
   return result;
 };
 
 mitk::ExponentialDecayModel::ParametersSizeType
 mitk::ExponentialDecayModel::GetNumberOfDerivedParameters() const
 {
   return NUMBER_OF_DERIVED_PARAMETERS;
 };
 
 mitk::ExponentialDecayModel::ParamterUnitMapType mitk::ExponentialDecayModel::GetDerivedParameterUnits() const
 {
   ParamterUnitMapType result;
 
   result.insert(std::make_pair(NAME_DERIVED_PARAMETER_k, UNIT_DERIVED_PARAMETER_k));
 
   return result;
 };
 
 mitk::ExponentialDecayModel::ModelResultType
 mitk::ExponentialDecayModel::ComputeModelfunction(const ParametersType& parameters) const
 {
   double     y0 = parameters[POSITION_PARAMETER_y0];
   double     lambda = parameters[POSITION_PARAMETER_lambda];
 
   ModelResultType signal(m_TimeGrid.GetSize());
 
   ModelResultType::iterator signalPos = signal.begin();
 
   for (const auto& gridPos : m_TimeGrid)
   {
     *signalPos = y0 * exp(-1.0 * gridPos/ lambda);
     ++signalPos;
   }
 
   return signal;
 };
 
 mitk::ExponentialDecayModel::ParameterNamesType mitk::ExponentialDecayModel::GetStaticParameterNames() const
 {
   ParameterNamesType result;
 
   return result;
 }
 
 mitk::ExponentialDecayModel::ParametersSizeType  mitk::ExponentialDecayModel::GetNumberOfStaticParameters() const
 {
   return NUMBER_OF_STATIC_PARAMETERS;
 }
 
 mitk::ExponentialDecayModel::ParamterUnitMapType mitk::ExponentialDecayModel::GetStaticParameterUnits() const
 {
   ParamterUnitMapType result;
 
   //do nothing
 
   return result;
 };
 
 void mitk::ExponentialDecayModel::SetStaticParameter(const ParameterNameType& /*name*/,
     const StaticParameterValuesType& /*values*/)
 {
   //do nothing
 };
 
 mitk::ExponentialDecayModel::StaticParameterValuesType mitk::ExponentialDecayModel::GetStaticParameterValue(
   const ParameterNameType& /*name*/) const
 {
   StaticParameterValuesType result;
 
   //do nothing
 
   return result;
 };
 
 
 mitk::ModelBase::DerivedParameterMapType mitk::ExponentialDecayModel::ComputeDerivedParameters(
   const mitk::ModelBase::ParametersType &parameters) const
 {
   DerivedParameterMapType result;
 
   //Model Parameters
-  double     y0 = parameters[POSITION_PARAMETER_y0];
   double     lambda = parameters[POSITION_PARAMETER_lambda];
 
   double k = 1.0 / (lambda + mitk::eps);
   result.insert(std::make_pair(NAME_DERIVED_PARAMETER_k, k));
   return result;
 };
 
 itk::LightObject::Pointer mitk::ExponentialDecayModel::InternalClone() const
 {
   ExponentialDecayModel::Pointer newClone = ExponentialDecayModel::New();
 
   newClone->SetTimeGrid(this->m_TimeGrid);
 
   return newClone.GetPointer();
 };