[Insight-developers] gdcm patient orientation

[Stephen R. Aylward]

Hi,

It would be great to get an expert's opinion on secondary capture 
images.   My understanding is that after image processing the image is 
considered a secondary capture image - results of digital subtraction 
are one of the most commmon examples.   After blurring or edge enhancing 
an MR image, is it still an MR image?

Stephen





Bill Lorensen wrote:
> That may be because gdcm is still reporting the new series as a 
> Secondary Capture. I'm not sure. In my local copy I have removed 
> 0002|0002 and 0008|0016 from gdcmFileHelper. I do not think the new 
> series should be a secondary capture. Rather it is really a derived image.
> 
> Since 0020|0020 does not affect me, you can leave it in. But, saying the 
> series generated by itk are Secondary Captures is not correct I believe.
> 
> Bill
> 
> At 11:13 AM 2/21/2006, Mathieu Malaterre wrote:
> 
>> Lorensen, William E (GE, Research) wrote:
>>
>>> Mathieu,
>>> My dicom checker complains:
>>> (0x0020,0x0020)  CS  4        [L\P] # Patient Orientation
>>> !!                            ERROR : Patient Position 
>>> (0x0020,0x0020) must not be present
>>> !!                                    if (0x0020, 0x0032) and 
>>> (0x0020, 0x0037) are required
>>> In Table C.7-9 of the dicom standard:
>>> Patient direction of rows and columns of the image. Required if 
>>> imkage does not require Image Orientation (Patient) (0020,0037) and 
>>> Image Position (Patient) (0020,0032). See C.7.6.1.1.1 fr further 
>>> explanation.
>>>
>>> I think gdcm should not be adding 0020|0020 if the others are 
>>> present. However, this does not seem to affect processing on the A/W.
>>
>>
>> If I remove 0020|0020, David Clunie tools report:
>>
>> ./dciodvfy Image0075.dcm
>> ...
>> Error - Missing attribute Type 2C Conditional 
>> Element=<PatientOrientation> Module=<GeneralImage>
>>
>> Mathieu
>>
>> Index: gdcmFileHelper.cxx
>> ===================================================================
>> RCS file: 
>> /cvsroot/Insight/Insight/Utilities/gdcm/src/gdcmFileHelper.cxx,v
>> retrieving revision 1.8
>> diff -u -3 -p -r1.8 gdcmFileHelper.cxx
>> --- gdcmFileHelper.cxx  20 Feb 2006 21:35:24 -0000      1.8
>> +++ gdcmFileHelper.cxx  21 Feb 2006 15:32:18 -0000
>> @@ -1639,12 +1639,12 @@ void FileHelper::CheckMandatoryElements(
>>
>>     // Patient Orientation
>>     // Can be computed from (0020|0037) :  Image Orientation (Patient)
>> -   gdcm::Orientation o;
>> -   std::string ori = o.GetOrientation ( FileInternal );
>> -   if (ori != "\\" && ori != GDCM_UNFOUND)
>> -      CheckMandatoryEntry(0x0020,0x0020,ori);
>> -   else
>> -      CheckMandatoryEntry(0x0020,0x0020,"");
>> +   //gdcm::Orientation o;
>> +   //std::string ori = o.GetOrientation ( FileInternal );
>> +   //if (ori != "\\" && ori != GDCM_UNFOUND)
>> +   //   CheckMandatoryEntry(0x0020,0x0020,ori);
>> +   //else
>> +   //   CheckMandatoryEntry(0x0020,0x0020,"");
>>
>>     // Modality : if missing we set it to 'OTher'
>>     CheckMandatoryEntry(0x0008,0x0060,"OT");
>> _______________________________________________
>> Insight-developers mailing list
>> Insight-developers at itk.org
>> http://www.itk.org/mailman/listinfo/insight-developers
> 
> 
> _______________________________________________
> Insight-developers mailing list
> Insight-developers at itk.org
> http://www.itk.org/mailman/listinfo/insight-developers
> 

-- 
=============================================================
Stephen R. Aylward, Ph.D.
Chief Medical Scientist
Kitware, Inc.
http://www.kitware.com