[vtkusers] [Gdcm2] distinguish between real CT scans(beam ON)and non-realCT scans(beam OFF)

[Scott Johnson]

Hello Ashish,

 

I don't know of any other way to tell if the image has been processed
other than the looking for DERIVED\SECONDARY in the Image Type
attribute.  You may be able to dig through some of the IHE profiles
(http://ihe.net) to see if they address that issue.  I'd be surprised if
they did.

 

My general philosophy is that eventually you have to fall back to what
the standard says.  If a workstation implements it correctly that's what
you'll see.  If they didn't implement it correctly they need to fix it.
These attributes are not edited by a tech.

 

                                -- Scott

 

From: Ashish Singh [mailto:asinghmlists at gmail.com] 
Sent: Tuesday, February 23, 2010 9:39 AM
To: gdcm-developers at lists.sourceforge.net; vtkusers at vtk.org
Subject: Re: [Gdcm2] [vtkusers] distinguish between real CT scans(beam
ON)and non-realCT scans(beam OFF)

 

Thanks Scott, I checked the section you mentioned in dicom standard.
Yes, I can always check for these strings in the dicom tags, but what if
these tags have incorrect information due to maybe machine or human
error (I don't know if a tech. can add or modify these.) . How do we go
about it in that case? Is there another check that we can do?

Thanks,
Ashish

On Fri, Feb 19, 2010 at 1:36 PM, Scott Johnson
<Scott.Johnson at neuwave.com> wrote:

Hello Ashish,

 

You're looking at the right attribute.  If Image Type (0008,0008)
contains DERIVED is has been computed from one or more other images.
Look in Part 3 section C.7.6.1.1.2.  The attribute will probably also
contain SECONDARY, but I can't guarantee that.

 

You might also look at Derivation Description (0008,2111) section
C.7.6.1.1.3.  But that attribute is type 3 (optional).

 

Good luck.

 

                                -- Scott

 

From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On
Behalf Of Ashish Singh
Sent: Friday, February 19, 2010 10:31 AM
To: vtkusers at vtk.org; gdcm-developers at lists.sourceforge.net
Subject: [vtkusers] distinguish between real CT scans(beam ON) and
non-realCT scans(beam OFF)

 

Hi,

I am trying to recursively read all dicom images from a CT study with
several series. How do I figure out which images are real/primary
scans(where the x-ray beam was ON) and which ones are not( such as
recons, etc.)? I have been looking at the Image Type Tag(0008,0008) and
series description tag (0008,103E), but is there a more systematic and
foolproof way of figuring this out?

This may not exactly be a VTK/GDCM question, but since there are many
dicom experts in the community, if anyone can guide me, I would really
appreciate it.

Thanks,
Ashish

 

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