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WIP: BUG: The Z spacing was set using thickness #112

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WIP: BUG: The Z spacing was set using thickness #112

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38 changes: 31 additions & 7 deletions Modules/IO/DCMTK/src/itkDCMTKFileReader.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1326,7 +1326,16 @@ ::GetSpacing(double * const spacing) const
// slice thickness
spacing[0] = _spacing[1];
spacing[1] = _spacing[0];
if(this->GetElementDS<double>(0x0018,0x0050,1,&_spacing[2],false) == EXIT_SUCCESS)
/*
* According Dicom standard (DICOM PS3.6 2016b - Data Dictionary)
* (0028, 0030) indicates physical X,Y spacing inside a slice;
* (0018, 0088) indicates physical Z spacing between slices;
* which above are also consistent with Dcom2iix software.
* when we can not get (0018, 0088),we will revert to previous
* behavior and use (0018, 0050) thickness as a proxy to spacing.
* */
if(GetElementDS<double>(0x0018,0x0088,1,&_spacing[2], false) == EXIT_SUCCESS
|| GetElementDS<double>(0x0018,0x0050,1,&_spacing[2],false) == EXIT_SUCCESS)
{
spacing[2] = _spacing[2];
}
Expand Down Expand Up @@ -1359,12 +1368,27 @@ ::GetSpacing(double * const spacing) const
rval = item.GetElementSQ(0x0028,0x9110,subSequence,false);
if(rval == EXIT_SUCCESS)
{
if(subSequence.GetElementDS<double>(0x0028,0x0030,2,_spacing,false) == EXIT_SUCCESS
&& subSequence.GetElementDS<double>(0x0018,0x0050,1,&_spacing[2]) == EXIT_SUCCESS)
{
spacing[0] = _spacing[1];
spacing[1] = _spacing[0];
spacing[2] = _spacing[2];
/*
* According Dicom standard (DICOM PS3.6 2016b - Data Dictionary)
* (0028, 0030) indicates physical X,Y spacing inside a slice;
* (0018, 0088) indicates physical Z spacing between slices;
* which above are also consistent with Dcom2iix software.
* when we can not get (0018, 0088),we will revert to previous
* behavior and use (0018, 0050) thickness as a proxy to spacing.
* */
if(subSequence.GetElementDS<double>(0x0028,0x0030,2,_spacing,false) == EXIT_SUCCESS)
{
spacing[0] = _spacing[1];
spacing[1] = _spacing[0];
if (subSequence.GetElementDS<double>(0x0018,0x0088,1,&_spacing[2], false) == EXIT_SUCCESS
|| subSequence.GetElementDS<double>(0x0018,0x0050,1,&_spacing[2], false) == EXIT_SUCCESS){
spacing[2] = _spacing[2];
}
else
{
// punt, zSpace of 1
spacing[2] = 1.0;
}
break;
}
}
Expand Down