diff --git a/Modules/DiffusionImaging/FiberTracking/Algorithms/itkTractDensityImageFilter.cpp b/Modules/DiffusionImaging/FiberTracking/Algorithms/itkTractDensityImageFilter.cpp
index 13df693a5d..dc860353fc 100644
--- a/Modules/DiffusionImaging/FiberTracking/Algorithms/itkTractDensityImageFilter.cpp
+++ b/Modules/DiffusionImaging/FiberTracking/Algorithms/itkTractDensityImageFilter.cpp
@@ -1,248 +1,251 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Coindex[1]right (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 "itkTractDensityImageFilter.h"
 
 // VTK
 #include <vtkPolyLine.h>
 #include <vtkCellArray.h>
 #include <vtkCellData.h>
 #include <vtkCell.h>
 
 // misc
 #include <math.h>
 #include <boost/progress.hpp>
 
 namespace itk{
 
 template< class OutputImageType >
 TractDensityImageFilter< OutputImageType >::TractDensityImageFilter()
     : m_InvertImage(false)
     , m_FiberBundle(NULL)
     , m_UpsamplingFactor(1)
     , m_InputImage(NULL)
     , m_BinaryOutput(false)
     , m_UseImageGeometry(false)
     , m_OutputAbsoluteValues(false)
     , m_UseTrilinearInterpolation(false)
     , m_DoFiberResampling(true)
 {
 
 }
 
 template< class OutputImageType >
 TractDensityImageFilter< OutputImageType >::~TractDensityImageFilter()
 {
 }
 
 template< class OutputImageType >
 itk::Point<float, 3> TractDensityImageFilter< OutputImageType >::GetItkPoint(double point[3])
 {
     itk::Point<float, 3> itkPoint;
     itkPoint[0] = point[0];
     itkPoint[1] = point[1];
     itkPoint[2] = point[2];
     return itkPoint;
 }
 
 template< class OutputImageType >
 void TractDensityImageFilter< OutputImageType >::GenerateData()
 {
     // generate upsampled image
     mitk::BaseGeometry::Pointer geometry = m_FiberBundle->GetGeometry();
     typename OutputImageType::Pointer outImage = this->GetOutput();
 
     // calculate new image parameters
     itk::Vector<double,3> newSpacing;
     mitk::Point3D newOrigin;
     itk::Matrix<double, 3, 3> newDirection;
     ImageRegion<3> upsampledRegion;
     if (m_UseImageGeometry && !m_InputImage.IsNull())
     {
         MITK_INFO << "TractDensityImageFilter: using image geometry";
         newSpacing = m_InputImage->GetSpacing()/m_UpsamplingFactor;
         upsampledRegion = m_InputImage->GetLargestPossibleRegion();
         newOrigin = m_InputImage->GetOrigin();
         typename OutputImageType::RegionType::SizeType size = upsampledRegion.GetSize();
         size[0] *= m_UpsamplingFactor;
         size[1] *= m_UpsamplingFactor;
         size[2] *= m_UpsamplingFactor;
         upsampledRegion.SetSize(size);
         newDirection = m_InputImage->GetDirection();
     }
     else
     {
         MITK_INFO << "TractDensityImageFilter: using fiber bundle geometry";
         newSpacing = geometry->GetSpacing()/m_UpsamplingFactor;
         newOrigin = geometry->GetOrigin();
         mitk::Geometry3D::BoundsArrayType bounds = geometry->GetBounds();
-        newOrigin[0] += bounds.GetElement(0);
-        newOrigin[1] += bounds.GetElement(2);
-        newOrigin[2] += bounds.GetElement(4);
+
+        // we retrieve the origin from a vtk-polydata (corner-based) and hance have to translate it to an image geometry
+        // i.e. center-based
+        newOrigin[0] += bounds.GetElement(0) + 0.5 * newSpacing[0];
+        newOrigin[1] += bounds.GetElement(2) + 0.5 * newSpacing[1];
+        newOrigin[2] += bounds.GetElement(4) + 0.5 * newSpacing[2];
 
         for (int i=0; i<3; i++)
             for (int j=0; j<3; j++)
                 newDirection[j][i] = geometry->GetMatrixColumn(i)[j];
-        upsampledRegion.SetSize(0, geometry->GetExtent(0)*m_UpsamplingFactor);
-        upsampledRegion.SetSize(1, geometry->GetExtent(1)*m_UpsamplingFactor);
-        upsampledRegion.SetSize(2, geometry->GetExtent(2)*m_UpsamplingFactor);
+        upsampledRegion.SetSize(0, ceil( geometry->GetExtent(0)*m_UpsamplingFactor ) );
+        upsampledRegion.SetSize(1, ceil( geometry->GetExtent(1)*m_UpsamplingFactor ) );
+        upsampledRegion.SetSize(2, ceil( geometry->GetExtent(2)*m_UpsamplingFactor ) );
     }
     typename OutputImageType::RegionType::SizeType upsampledSize = upsampledRegion.GetSize();
 
     // apply new image parameters
     outImage->SetSpacing( newSpacing );
     outImage->SetOrigin( newOrigin );
     outImage->SetDirection( newDirection );
     outImage->SetLargestPossibleRegion( upsampledRegion );
     outImage->SetBufferedRegion( upsampledRegion );
     outImage->SetRequestedRegion( upsampledRegion );
     outImage->Allocate();
     outImage->FillBuffer(0.0);
 
     int w = upsampledSize[0];
     int h = upsampledSize[1];
     int d = upsampledSize[2];
 
     // set/initialize output
     OutPixelType* outImageBufferPointer = (OutPixelType*)outImage->GetBufferPointer();
 
     // resample fiber bundle
     float minSpacing = 1;
     if(newSpacing[0]<newSpacing[1] && newSpacing[0]<newSpacing[2])
         minSpacing = newSpacing[0];
     else if (newSpacing[1] < newSpacing[2])
         minSpacing = newSpacing[1];
     else
         minSpacing = newSpacing[2];
 
     MITK_INFO << "TractDensityImageFilter: resampling fibers to ensure sufficient voxel coverage";
     if (m_DoFiberResampling)
     {
         m_FiberBundle = m_FiberBundle->GetDeepCopy();
         m_FiberBundle->ResampleSpline(minSpacing/10);
     }
 
     MITK_INFO << "TractDensityImageFilter: starting image generation";
 
     vtkSmartPointer<vtkPolyData> fiberPolyData = m_FiberBundle->GetFiberPolyData();
     vtkSmartPointer<vtkCellArray> vLines = fiberPolyData->GetLines();
     vLines->InitTraversal();
     int numFibers = m_FiberBundle->GetNumFibers();
     boost::progress_display disp(numFibers);
     for( int i=0; i<numFibers; i++ )
     {
         ++disp;
         vtkIdType   numPoints(0);
         vtkIdType*  points(NULL);
         vLines->GetNextCell ( numPoints, points );
         float weight = m_FiberBundle->GetFiberWeight(i);
 
         // fill output image
         for( int j=0; j<numPoints; j++)
         {
             itk::Point<float, 3> vertex = GetItkPoint(fiberPolyData->GetPoint(points[j]));
             itk::Index<3> index;
             itk::ContinuousIndex<float, 3> contIndex;
             outImage->TransformPhysicalPointToIndex(vertex, index);
             outImage->TransformPhysicalPointToContinuousIndex(vertex, contIndex);
 
             if (!m_UseTrilinearInterpolation && outImage->GetLargestPossibleRegion().IsInside(index))
             {
                 if (m_BinaryOutput)
                     outImage->SetPixel(index, 1);
                 else
                     outImage->SetPixel(index, outImage->GetPixel(index)+0.01*weight);
                 continue;
             }
 
             float frac_x = contIndex[0] - index[0];
             float frac_y = contIndex[1] - index[1];
             float frac_z = contIndex[2] - index[2];
 
             if (frac_x<0)
             {
                 index[0] -= 1;
                 frac_x += 1;
             }
             if (frac_y<0)
             {
                 index[1] -= 1;
                 frac_y += 1;
             }
             if (frac_z<0)
             {
                 index[2] -= 1;
                 frac_z += 1;
             }
 
             frac_x = 1-frac_x;
             frac_y = 1-frac_y;
             frac_z = 1-frac_z;
 
             // int coordinates inside image?
             if (index[0] < 0 || index[0] >= w-1)
                 continue;
             if (index[1] < 0 || index[1] >= h-1)
                 continue;
             if (index[2] < 0 || index[2] >= d-1)
                 continue;
 
             if (m_BinaryOutput)
             {
                 outImageBufferPointer[( index[0]   + w*(index[1]  + h*index[2]  ))] = 1;
                 outImageBufferPointer[( index[0]   + w*(index[1]+1+ h*index[2]  ))] = 1;
                 outImageBufferPointer[( index[0]   + w*(index[1]  + h*index[2]+h))] = 1;
                 outImageBufferPointer[( index[0]   + w*(index[1]+1+ h*index[2]+h))] = 1;
                 outImageBufferPointer[( index[0]+1 + w*(index[1]  + h*index[2]  ))] = 1;
                 outImageBufferPointer[( index[0]+1 + w*(index[1]  + h*index[2]+h))] = 1;
                 outImageBufferPointer[( index[0]+1 + w*(index[1]+1+ h*index[2]  ))] = 1;
                 outImageBufferPointer[( index[0]+1 + w*(index[1]+1+ h*index[2]+h))] = 1;
             }
             else
             {
                 outImageBufferPointer[( index[0]   + w*(index[1]  + h*index[2]  ))] += (  frac_x)*(  frac_y)*(  frac_z);
                 outImageBufferPointer[( index[0]   + w*(index[1]+1+ h*index[2]  ))] += (  frac_x)*(1-frac_y)*(  frac_z);
                 outImageBufferPointer[( index[0]   + w*(index[1]  + h*index[2]+h))] += (  frac_x)*(  frac_y)*(1-frac_z);
                 outImageBufferPointer[( index[0]   + w*(index[1]+1+ h*index[2]+h))] += (  frac_x)*(1-frac_y)*(1-frac_z);
                 outImageBufferPointer[( index[0]+1 + w*(index[1]  + h*index[2]  ))] += (1-frac_x)*(  frac_y)*(  frac_z);
                 outImageBufferPointer[( index[0]+1 + w*(index[1]  + h*index[2]+h))] += (1-frac_x)*(  frac_y)*(1-frac_z);
                 outImageBufferPointer[( index[0]+1 + w*(index[1]+1+ h*index[2]  ))] += (1-frac_x)*(1-frac_y)*(  frac_z);
                 outImageBufferPointer[( index[0]+1 + w*(index[1]+1+ h*index[2]+h))] += (1-frac_x)*(1-frac_y)*(1-frac_z);
             }
         }
     }
 
     if (!m_OutputAbsoluteValues && !m_BinaryOutput)
     {
         MITK_INFO << "TractDensityImageFilter: max-normalizing output image";
         OutPixelType max = 0;
         for (int i=0; i<w*h*d; i++)
             if (max < outImageBufferPointer[i])
                 max = outImageBufferPointer[i];
         if (max>0)
             for (int i=0; i<w*h*d; i++)
             {
                 outImageBufferPointer[i] /= max;
             }
     }
     if (m_InvertImage)
     {
         MITK_INFO << "TractDensityImageFilter: inverting image";
         for (int i=0; i<w*h*d; i++)
             outImageBufferPointer[i] = 1-outImageBufferPointer[i];
     }
     MITK_INFO << "TractDensityImageFilter: finished processing";
 }
 }