[Insight-users] Slice orientation determination (DICOM)

[Miller, James V (Research)]

If there is a DICOM tag that identifies this series as the scanogram,
we can add cache that data so that it can be queried by an application.
You can use a tool like DICOMWorks to looks at the available tags.

The DICOMParser library used by DICOMImageIO2 can easily be extended 
to cache more tags.  We just need to know what tags to cache.  The 
design of the DICOMParser is to only cache the tags that we know we
are interested in.  DICOM headers can be fairly large/complicated and 
we only end up caching the information we know we want to use. (We have
thought of putting in a mode to cache everything, but it gets pretty 
complicated wrt nested DICOM tags).

Once we cache this value, you'd be able to query the DICOMImageIO2 object
for the state or we can propagate the information up the MetaDataDictionary
for the resulting Image.  For the latter, if this is a "field" that could be

considered common to files type other than DICOM, we would want to 
use a common name in the MetaDataDictionary, such as though described
in Insight/Code/IO/itkIOCommon.h

Jim


-----Original Message-----
From: Simon Harris [mailto:s.j.harris at imperial.ac.uk]
Sent: Thursday, September 02, 2004 10:35 AM
To: Insight-users at itk.org
Subject: [Insight-users] Slice orientation determination (DICOM)



I'm beginning to have some success loading DICOM data into
my own code now with ITK. The datasets I have typically
consist of about 4 or 5 series UIDs (we had multi-slice
spacing images, with different regions of the body having
different slice thicknesses and hence are different
series)

Now, one of the series in the set will be the scanogram
image (typically consists of a short sequence of images).
Is there an easy way to identify this series automatically
as different from the normal slices?

I was hoping for an image orientation member variable I
could interrogate but unless I've just looked in the wrong
place I can't see one. I'm sure there must be a simple way
that I've just overlooked.

Many thanks
Simon.


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