[ITK Community] Resampling and origin patient for DICOM files

[Guillaume Lemaître]

Hi all,

I am currently working on the following task. I got two DICOM series from
different modality with different spacing, and origin. A third DICOM serie
correspond to binary segmentation of one the previous serie. I would like
to "project" this segmentation into the other serie. I think that the
resampling filter should make this work quite well. It should look
something like that:

  ResampleFilterType::Pointer resampler = ResampleFilterType::New();
  resampler->SetInput( maskVolume->GetOutput() );
  resampler->SetTransform( transform );
  resampler->SetInterpolator( interpolator );
  resampler->SetOutputOrigin( targetVolume->GetOutput()->GetOrigin() );
  resampler->SetOutputSpacing( targetVolume->GetOutput()->GetSpacing() );
  resampler->SetOutputDirection( targetVolume->GetOutput()->GetDirection()
);
  resampler->SetSize(
targetVolume->GetOutput()->GetLargestPossibleRegion().GetSize() );
  resampler->Update();

However, I got trapped with what seems to be a problem of origin. I search
around and different discussions and got quite confused. From what I found
is the following:
Using gdcminfo to read the origin of targetVolume will give me the same
information than the tag (0020,0032) of the DICOM header. However, it will
be different from targetVolume->GetOuput()->GetOrigin() which imply a shift
when saving my data later.

What should the proper way to do such task?

Thanks in advance,

Best regards,
-- 




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