[Insight-users] RE: Getting at private dicom tags

[Kris Thielemans]

Hi



I solved my own problem (original post of 1 month ago quoted below). I just
thought to let you know. 

The bit that I didn't tell you was that I had to read one of the files in
the series to get at the value of the tags, which I do as follows: 

  typedef itk::GDCMImageIO       ImageIOType; 
  ImageIOType::Pointer dicomIO = ImageIOType::New(); 
  typedef itk::Image< float, 2 >         ImageType2D; 
  typedef itk::ImageFileReader< ImageType2D >        ReaderType2D; 
  ReaderType2D::Pointer reader = ReaderType2D::New(); 
  reader->SetImageIO( dicomIO ); 
  typedef std::vector<std::string>    FileNamesContainer; 
  FileNamesContainer fileNames = 
    nameGenerator->GetFileNames( seriesItr->c_str()); 
  reader->SetFileName( fileNames[0].c_str() ); 
  reader->Update(); 

Only then can I call dicomIO->GetMetaDataDictionary() as I said in my
original post. 

So, where was the problem? 

I had set 
   nameGenerator->SetLoadPrivateTags ( true ); 

But I had NOT set 
  dicomIO->SetLoadPrivateTags(true); 

I guess I thought that this was done by the nameGenerator business but as
that one doesn't know about dicomIO, that was rather stupid.

Now you know. 

Kris 

> -----Original Message----- 
> From: Thielemans, Kris [mailto:kris.thielemans at imperial.ac.uk] 
> Sent: 15 September 2006 18:07 
> To: insight-users at itk.org 
> Subject: Getting at private dicom tags 
> 
> Hi 
> 
> I need to get the value of a private tag (frame number in GE gated PET 
> data). I know for sure that the tag is there (for instance using 
> dcmtk's dcmdump). 
> 
> I've modified the example IO/DicomSeriesReadPrintTags to what's 
> happening, e.g. I've added 
> 
>   nameGenerator->SetLoadPrivateTags ( true ); 
>   nameGenerator->AddSeriesRestriction("0009|10D8" ); 
> 
> This works in the sense that the value of the frame_number now gets 
> added to the 'seriesIdentifier'. However, when I try to get at its 
> value using 
> 
>   typedef itk::MetaDataDictionary   DictionaryType; 
>   const  DictionaryType & dictionary = 
> dicomIO->GetMetaDataDictionary(); 
>   DictionaryType::ConstIterator tagItr = dictionary.Find( "0009|10D8" 
> ); 
> 
> this function tells me that it cannot find the tag. (It can find some 
> e.g. "0020|0011" SeriesNumber or patientName. 
> 
> Indeed, the output of (my modified) DicomSeriesReadPrintTags shows no 
> private tags. 
> 
> Is there a way around this? 
> 
> Thanks 
> 
> Kris Thielemans 
> Hammersmith Imanet, part of GE Healthcare 
>