[Insight-developers] DICOM Header Tags

[Mathieu Malaterre]

Vincent,

	You understand that this DICOM tag is from the private/shadow 
dictionary. This is hardly ever documented, and there has been case 
where the definition of the value changed over the year. The algorithm 
to find the defintion of a DICOM tag from private dictionary is *really* 
tricky (especially Siemens/SPI).

#1 But anyway if you know what you care doing you can change the 
following line:

  else if ( gdcm::ValEntry* v = dynamic_cast<gdcm::ValEntry*>(d) )
       {
       // Only copying field from the public DICOM dictionary
       if( v->GetName() != "unkn")   <--- this one


#2 The other (and better approach) is if you have the dictionary for 
this type of image. You could edit the file dicomV3.dic. So that it 
containing a line, something like:

0029 1020 ?? 1 Diffusion Tensor Series

Therefore at load time the dictionary will return a name for this tag.

HTH,
Mathieu
As a side note, private dictionaries are handler much smoother in gdcm CVS.

And if you have the time could you send me the pdf or some links that 
describe this tag, I cannot seems to find it in Philips, SIEMENS, GE, 
ACUSON...

And for the historical reason, DICOM name use to be the key in the 
MetaDataDictionary, one understand why private (unknown) tags where 
therefore skip at load time :)

Vincent A. Magnotta wrote:
> Is there a reason that the DICOM header tag (0029, 1020) is being
> excluded from the MetaDataDictionary? I am trying to sort out a
> diffusion tensor series collected on a Siemens scanner. Siemens puts a
> significant amount of information in this portion of the header in ASCII
> format. I would like to use some of this information to generate a 4D
> image from the 3D images loaded by the GDCM I/O factory.
> 
> Vince
> 
>