[Insight-users] some querry about dicom image

[Mathieu Malaterre]

Miller, James V (Research) wrote:
> Soumen, 
> 
> 1. I'm not sure the DICOM headers have to be same size.

The DICOM header is different from one image to the other. At least it 
include a serie number like this:

128.43564.12365.65.46.*

Where * is 1 to your number of images, thus if you have at least 10 
images, you're stuck (your 10th image header will be one char bigger).

> I believe the bulk pixel data is always at the end of the file (unless you
> are trying to pull out pixel data from a private tag).  So once you know
> the size of an image, you can always skip to the start of the pixel 
> data by offseting the file pointer from the end of the file.

Humm your are a lucky guy ;)

Often we have a 'footer' at the end of the image. And furthermore most 
of our images are compressed (jpeg, jpeg lossless, rle, jpeg2000).

Soumen, you should really have a look at solutions like:

http://www . vtk . org/doc/nightly/html/classvtkDICOMImageReader . html
http://www . vtk . org/cgi-bin/vtkfaq?req=show&file=faq03 . 006 . htp
http://vtk . org/pipermail/vtkusers/2003-March/016679 . html
http://www . itk . org/cgi-bin/InsightFAQ/InsightFAQ?req=show&file=faq01 . 009 . htp

or more recently:
http://www . creatis . insa-lyon . fr/Public/Gdcm/
it provides a vtkGdcmReader

my 2 cents,
mathieu


>>-----Original Message-----
>>From: soumend at magnum . barc . ernet . in 
>>[mailto:soumend at magnum . barc . ernet . in]
>>Sent: Monday, October 20, 2003 6:31 AM
>>To: Insight-users at public . kitware . com
>>Subject: [Insight-users] some querry about dicom image
>>
>>
>>hi all!!!!
>>I am trying to view 3D DICOM image through VTK. In connection 
>>with that I have 
>>following querries. Will someone plz help by answering the following 
>>question....
>>
>>1. Should the dicom files having the same series uid have 
>>same header size?
>>2. Do the dicom files having same series uid have same values 
>>for rescale 
>>slope, rescale offset....if not,wht makes the difference?
>>3. Do the dicom files having same series uid have same values 
>>for bits 
>>allocated,bits stored,pixel representation, height etc? (i 
>>think they shoukd 
>>have the same value but not sure)
>>
>>Thanking in advance...soumen
>>
>>
>>
>>
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-- 
Mathieu Malaterre
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