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PostPosted: Sat, 2018-08-25, 10:25 
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Joined: Mon, 2016-09-26, 14:08
Posts: 13
HI,

We are implementing MPPS DICOM workflow for C-Arm. Is it possible to send Multiple Affected SOP ID's in a single N set command. In C-Arm usually a single surgery might contain multiple images to be captured to complete a surgery. So we wish to send all the acquired images as affected SOP in a single N-Set command.

Is it possible to point us to a general workflow of MPPS in case of C-Arm.

Regards.
Arun


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PostPosted: Mon, 2018-08-27, 08:26 
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DCMTK Developer

Joined: Fri, 2004-11-05, 13:47
Posts: 1687
Location: Oldenburg, Germany
Hi,

I have the feeling that you are interpreting the standard in a wrong way. So just to be sure, this is what happens according to the standard: Via MPPS you create a status object (Modality Performed Procedure Step - PPS) about the current examination. It does not reflect the status of a single image, but instead the whole examination (or a clearly identifiable part of it). During this PPS, multiple images can be created, and besides other examination parameters, those images must be documented within that PPS object. The PPS object itself is identified by a SOP Instance UID (that is created during N-CREATE) and referred to as Affected SOP Instance UID. The PPS object links to the images within the Performed Series Sequence.

So the answer to your question is:

In a single N-SET-RQ you can only send data related to a single (PPS), identified by it's (Affected) SOP Instance UID.

If you want to update multiple PPS, you must send one PPS message for each of them. You can do this on one or many DICOM network associations.

You can document the created images for one of the PPS with a single N-SET, or with multiple.

I hope this helps. Best regards,
Michael


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