[Insight-users] Re: incorrect z-spacing in GDCM reading

[Mathieu Malaterre]

Hxsham

	What are you reporting is rather scary. Could you tell us which version 
of ITK are you using ? Also on which example did you base your code ? 
The fact is that this is tested nightly:

$ ctest -R itkGDCMSeriesReadImageWrite -V

This create three new files in Testing/Temporary/. Then all you need to 
check is that 'Image Position Patient' is correct:


$ for i in `ls Testing/Temporary/*.dcm`; do 
./bin/DicomImageReadPrintTags $i; done | grep "Image Position"

Image Position Patient = -112\ -21.688\ 126.894
Image Position Patient = -112\-20.2729\ 127.641
Image Position Patient = -112\-18.8578\ 128.388

	Which looks good to me...

HTH,
Mathieu

Hxsham Fire wrote:
> George and Mathieu,
> 
> This looks very similar to the problem I was having
> with ITK...
> The dicom series reader was reading the slices fine,
> and the volume had correct spacing... however after I
> write the series using the dicom series writer and try
> to read it back again, for further modification is
> when the z spacing fails, and the slices are compacted
> in the z direction, and it is most noticable if I try
> to rotate that image...  also I noticed that all the
> slices have the same z coordinate of the origin in the
> series written by the dicom writer (that is field
> 0020|0030) in the dicom directory, and it is the
> values of the last slice in the original series that
> is written on all the slices in the output series.
> 
> Hxsham
> 
> ----------------------------------------------------
> ----------------------------------------------------
> 
> George,
> 
>         Your code looks fine. The algorithm for
> finding the z spacing is kind 
> of tricky. So I am wondering if:
> 
> 1. Your images might not have proper 'Image Position
> Patient' / 'Image 
> Orientation Patient'
> 
> 2. If they have, maybe gdcm is not able to parse the
> string properly.
> 
> Could it be possible that you send me at least two
> images from this 
> dataset ?
> 
> If not, you'll have to turn the code to be more
> verbose in particular 
> when entering the function:
> 
> 
>      gdcm::SerieHelper::ImagePositionPatientOrdering
> 
> Thanks,
> Mathieu
> 
> 
> 
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