[Insight-users] Writing Resampled Images With New Orientation

[Luis Ibanez]

Hi Andreas, Kon,


A) What version of ITK are you using ?


B) Are you connecting the MetaDataDictionary of an input DICOM image ?


C) What tool are you using for looking at the direction matrix of
    the DICOM image ?


It will be very surprising if any transposition is happening...
but this is too important to disregard it.



  Please let us know,


      Luis


----------------------
Andreas Schuh wrote:
> Hi Kon,
> 
> this actually is exactly what I reported yet as bug .. However, 
> unfortunately it wasn't addressed so far nor did I get any response 
> whether I'm right or not. So I would appreciate if you had a look at 
> this bug report and whether it fixes your problem when you apply the 
> code fixes which I proposed in the comments.
> 
> http://public.kitware.com/Bug/view_all_bug_page.php?filter=20444
> 
> regards
> Andreas
> 
> Kon Z schrieb:
> 
>> Hello ALL,
>>
>> When I use ResampleImageFilter to resample an 3D image with a new 
>> direction matrix
>>
>> resampler->SetOutputDirection(directionMatrix);
>>
>> the filter output shows the specified orientation (with the values I 
>> specify in the direction matrix):
>>
>>   Direction:
>> 0.529919 0.46188 -0.711233
>> 0 0.838671 0.544639
>> 0.848048 -0.288615 0.444428
>>
>> However, when I pass resample filter output to a writer connected to 
>> GDCMImageIO, the saved volume has this orientation (the direction 
>> matrix is transposed!):
>>
>>   Direction:
>> 0.529919 0 0.848048
>> 0.46188 0.838671 -0.288615
>> -0.711233 0.544639 0.444428
>>
>> Am I doing something wrong? Or am I not doing something I'm supposed 
>> to do with the image before passing it to the writer? Can someone 
>> please explain it to me?
>>
>> For the moment I use this workaround I found in the ITK Guide:
>> itk::EncapsulateMetaData<std::string>(
>>     resampler->GetOutput()->GetMetaDataDictionary(),
>>     "0020|0037", // Patient orientation tag.
>>     directionStream.str().c_str());
>>
>> where directionStream contains the correct string representation of 
>> the directionMatrix.
>>
>> Thanks.
>>
>> Best regards,
>> Kon Z
>>
>>
>>
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> 
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