[Dcmlib] [Fwd: Pixel Spacing Question]

[Mathieu Malaterre]

JP,

	Tu connaissais: Imager pixel spacing (0018,1164) ? Est-ce qu'on a des
images avec cette donnes ? Ca peut donner une aide qd on trouve pas l'
Image Spacing.

Mathieu

-------- Original Message --------
Subject: Pixel Spacing Question
Date: 12 May 2005 13:41:16 -0700
From: Karan Bajaj <>
Organization: http://groups.google.com
Newsgroups: comp.protocols.dicom

I know the pixel spacing question has been answered a number of times
in this group but I count find the answer to my question , so here it
is.

My dilemma is that if a CR image contains both the tags for pixel
spacing and imager pixel spacing, and they are not the same value, what
should I use.

Can there be a scenario where some one figures out using some sort of
calibration what the pixel spacing should be and populate the 0028,0030
tag.

I have checked conformance statements of a lot of modality vendors and
the above doesn't seem to be true.

Can there be any other reason that both tags are present and not the
same value.

I know that David clunie mentions that a good approach should be to
look for the Imager pixel spacing (0018,1164) tag first and then the
Pixel spacing (0028,0030) tag.  But in the case that some one does
calibrate and the appropriate value is entered in to the pixel spacing
tag, shouldn't then the 0028,0030 tag carry precedence.

Thanks in advance
Karan