[Dcmlib] [Fwd: Re: [Insight-developers] DICOM Header Tags]

[Mathieu Malaterre]

Just keeping track of information. This link provide information about 
tag 0029 1020 from SIEMENS.

Apparently without this information the image cannot be reconstructed. 
Therefore a shadow binary (and very long) entry is needed, whereas so 
far the belief was that shadow information are not needed to extract image.

Mathieu

-------- Original Message --------
Subject: Re: [Insight-developers] DICOM Header Tags
Date: Tue, 16 Aug 2005 09:34:33 -0500
From: Vincent A. Magnotta <>
Reply-To:
Organization: The University of Iowa
To: Mathieu Malaterre <>
References: <4301EFB6.8040004 at kitware.com>

Mathieu,

Thanks for your help. I will give your suggestion a try.This field as
actually an ASCII parameter map for the Siemens pulse sequence used to
create the images. It provides all information allowing you to take an
image from one Siemens scanner to another scanner and completely specify
the imaging parameters. An example of some of the fields are shown at
this site:

http://www.enac.northwestern.edu/~tew/archives/2003/02/25/incomplete-dicom-headers/


Since information about the DTI study such as number of directions and
number of b values applied are stored in this header, it will allow me
to convert the 3D data to a 4D representation that we use to analyze the
data.

Thanks Again,

Vince


On Tue, 2005-08-16 at 08:52, Mathieu Malaterre wrote:
> Ah ok I see your problem :)
> 
> sorry there is 'feature' in gdcm where long binary entry are skipped to 
> decrease memory usage:
> 
> $ grep MAX_SIZE_LOAD_ELEMENT_VALUE gdcm/*
> 
> It is currently set to 0xfff, whereas in your case you have an entry 
> 0xc940 long (51520). The easy work around is then change this line in gdcm:
> 
> gdcmDocument.cxx:const unsigned int 
> Document::MAX_SIZE_LOAD_ELEMENT_VALUE = 0xfff; // 4096
> 
> to something bigger.
> 
> Or at the itkGDCM level force loading this value.
> 
> But I definitely agree this is not easy to do. I'll assign me a bug to 
> provide the API from itkGDCM to set this value.
> 
> Sorry for trouble
> Mathieu
> Ps: This entry is really long, what does it contains? In fact this is 
> the first time a binary shadow entry will be used and you seems to be 
> able to decode it.
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