[Ctk-developers] Fwd: [GitHub] modalitiesInStudy not read correctly and more Modality related issues [commontk/CTK GH-15]

[OFFIS DICOM Team]

Forward of my email from yesterday because the "reply to" did not work ...

-------- Original-Nachricht --------
Betreff: Re: [Ctk-developers] Fwd: [GitHub] modalitiesInStudy not read 
correctly and more Modality related issues [commontk/CTK GH-15]
Datum: Mon, 02 May 2011 18:50:04 +0200
Von: OFFIS DICOM Team <dicom at offis.de>
An: Jean-Christophe Fillion-Robin <jchris.fillionr at kitware.com>

Dear all,

Dragan Toroman wrote on "github":

> Also, you might consider more "standard" way of performing the query with
> the modalities filter. Although the fact that many SCP implement search by
> the ModalitiesInStudy tag, it is not according to the DICOM standard and is
> rather a IHE extension with undefined behavior when used as a search
> criterion (well, it works well with dcm4chee). So it might now work with all
> DICOM compliant SCPs. The "proper" way (according to DICOM specifications)
> would be to perform a query for all needed modalities and combine the results.

well that's not totally correct because Modalities in Study (0008,0061) is
defined as an optional Q/R attribute (see section C.3.4 in DICOM PS 3.4).
However, since it optional, an Q/R SCU can not rely on that it is really
supported by the SCP. Details regarding the handling of optional keys for
Query/Retrieve can be found in section C.2.2.1.3 of DICOM PS 3.4.

Btw, as far as I know, Modalities in Study is no "IHE invention" but has
been introduced some years before with DICOM CP 71:

     ftp://medical.nema.org/medical/dicom/final/cp071_ft.pdf

What's true about it is that Modalities in Study is required for both SCU
and SCP as part of the IHE Query Images transaction [RAD-14], i.e. Image
Archive and Image Display actors.

Regards,
Jörg Riesmeier
-- 
OFFIS DICOM Team, Escherweg 2, D-26121 Oldenburg
E-Mail: dicom at offis.de, URL: http://dicom.offis.de