[Dcmlib] [Fwd: Pixel Spacing Question]

[Jean-Pierre Roux]

Mathieu Malaterre wrote:

> 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.

Je le connaissais de nom ...
... mais comme *aucune*  des images  auxquelles j'ai eu accès depuis 
1992 (ni naturellement aucune des 150 images de gdcmData) ne comportait 
cet élément, je l'avais rangé dans la catégories des Légendes Urbaines 
et n'avais même pas programmé sa recherche ...

Je peux le rajouter dans l'heuristique de GetPixelSpacing, en suyivant 
la recommandation de Davie Clunnie :
d'abord Imager pixel spacing
puis Image Spacing.

JPRx


>
> 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
>
>
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