diff --git a/Modules/DICOMReader/files.cmake b/Modules/DICOMReader/files.cmake
index b2e1395c9b..c64c804da2 100644
--- a/Modules/DICOMReader/files.cmake
+++ b/Modules/DICOMReader/files.cmake
@@ -1,53 +1,54 @@
 file(GLOB_RECURSE H_FILES RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/include/*")
 
 set(CPP_FILES
   mitkBaseDICOMReaderService.cpp
   mitkDICOMFileReader.cpp
   mitkDICOMTagScanner.cpp
   mitkDICOMGDCMTagScanner.cpp
   mitkDICOMDCMTKTagScanner.cpp
   mitkDICOMImageBlockDescriptor.cpp
   mitkDICOMITKSeriesGDCMReader.cpp
   mitkDICOMDatasetSorter.cpp
   mitkDICOMTagBasedSorter.cpp
   mitkDICOMGDCMImageFrameInfo.cpp
   mitkDICOMImageFrameInfo.cpp
   mitkDICOMIOHelper.cpp
   mitkDICOMGenericImageFrameInfo.cpp
   mitkDICOMDatasetAccessingImageFrameInfo.cpp
   mitkDICOMSortCriterion.cpp
   mitkDICOMSortByTag.cpp
   mitkITKDICOMSeriesReaderHelper.cpp
   mitkEquiDistantBlocksSorter.cpp
   mitkNormalDirectionConsistencySorter.cpp
   mitkSortByImagePositionPatient.cpp
   mitkGantryTiltInformation.cpp
   mitkClassicDICOMSeriesReader.cpp
   mitkThreeDnTDICOMSeriesReader.cpp
   mitkDICOMTag.cpp
   mitkDICOMTagsOfInterestHelper.cpp
   mitkDICOMTagCache.cpp
   mitkDICOMGDCMTagCache.cpp
   mitkDICOMGenericTagCache.cpp
   mitkDICOMEnums.cpp
   mitkDICOMReaderConfigurator.cpp
   mitkDICOMFileReaderSelector.cpp
   mitkIDICOMTagsOfInterest.cpp
   mitkDICOMTagPath.cpp
   mitkDICOMProperty.cpp
   mitkDICOMFilesHelper.cpp
 )
 
 set(RESOURCE_FILES
   configurations/3D/classicreader.xml
   configurations/3D/imageposition.xml
   configurations/3D/imageposition_byacquisition.xml
   configurations/3D/instancenumber.xml
   configurations/3D/instancenumber_soft.xml
   configurations/3D/slicelocation.xml
   configurations/3D/simpleinstancenumber_soft.xml
 
   configurations/3DnT/classicreader.xml
+  configurations/3DnT/imageposition.xml
   configurations/3DnT/imageposition_byacquisition.xml
   configurations/3DnT/imageposition_bytriggertime.xml
 )
diff --git a/Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml b/Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml
index 0f382e3a0d..dfc9c4bbb4 100644
--- a/Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml
+++ b/Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml
@@ -1,21 +1,10 @@
 <?xml version="1.0" standalone=no>
 <DICOMFileReader
-  class="ThreeDnTDICOMSeriesReader"
-  version="1"
-  label="IPP 3D+t"
-  description="Sort by Image Position (Patient), then group as 3D+t"
+  label="2013 default sorting for 3D+t"
+  description="ClassicDICOMSeriesReader that is equal to the 2013 implementation for 3D+t images"
+  class="ClassicDICOMSeriesReader"
+  version="2"
   group3DnT="true"
-  fixTiltByShearing="true">
-<DICOMDatasetSorter class="DICOMTagBasedSorter">
-  <Distinguishing>
-   <Tag name="SeriesInstanceUID" group="0020," element="000e"/>
-  </Distinguishing>
-  <Sorting>
-   <ImagePositionPatient/>
-   <Tag name="AcquisitionNumber" group="0x0020," element="0x0012"/>
-   <Tag name="AcquisitionTime" group="0x0008," element="0x0032"/>
-   <Tag name="TriggerTime" group="0x0018," element="0x1060"/>
-   <Tag name="SOPInstanceUID" group="0x0008," element="0x0018"/>
-  </Sorting>
-</DICOMDatasetSorter>
-</DICOMFileReader>
+  fixTiltByShearing="true"
+  >
+</DICOMFileReader>
\ No newline at end of file
diff --git a/Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml b/Modules/DICOMReader/resource/configurations/3DnT/imageposition.xml
similarity index 76%
copy from Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml
copy to Modules/DICOMReader/resource/configurations/3DnT/imageposition.xml
index 0f382e3a0d..f8e1601952 100644
--- a/Modules/DICOMReader/resource/configurations/3DnT/classicreader.xml
+++ b/Modules/DICOMReader/resource/configurations/3DnT/imageposition.xml
@@ -1,21 +1,21 @@
 <?xml version="1.0" standalone=no>
 <DICOMFileReader
   class="ThreeDnTDICOMSeriesReader"
-  version="1"
+  version="2"
   label="IPP 3D+t"
-  description="Sort by Image Position (Patient), then group as 3D+t"
+  description="Sort by Image Position (Patient), then group as 3D+t (till 2018/03 this configuration was wrongly stored in the file classicreader.xml (verison 1))"
   group3DnT="true"
   fixTiltByShearing="true">
-<DICOMDatasetSorter class="DICOMTagBasedSorter">
+<DICOMDatasetSorter class="DICOMTagBasedSorter" strictSorting="true" expectDistanceOne="true">
   <Distinguishing>
    <Tag name="SeriesInstanceUID" group="0020," element="000e"/>
   </Distinguishing>
   <Sorting>
    <ImagePositionPatient/>
    <Tag name="AcquisitionNumber" group="0x0020," element="0x0012"/>
    <Tag name="AcquisitionTime" group="0x0008," element="0x0032"/>
    <Tag name="TriggerTime" group="0x0018," element="0x1060"/>
    <Tag name="SOPInstanceUID" group="0x0008," element="0x0018"/>
   </Sorting>
 </DICOMDatasetSorter>
 </DICOMFileReader>