Re to MPPS Instance - DICOM

This is a discussion on Re to MPPS Instance - DICOM ; When the modality is SCU and there is SCP(RIS/PACS) and is running, and the flow is fine..Here MPPS instance is created in SCP(RIS) and stored. Same MPPS instance UID is sent back to SCU with N-CREATE-RSP and modality uses this ...

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Thread: Re to MPPS Instance

  1. Re to MPPS Instance

    When the modality is SCU and there is SCP(RIS/PACS) and is running, and

    the flow is fine..Here MPPS instance is created in SCP(RIS) and stored.

    Same MPPS instance UID is sent back to SCU with N-CREATE-RSP and
    modality uses this MPPS Instance UID as a reference UID(Referenced
    Performed Procedure Step Sequence Attribute) in all image instances it
    generates. Hope this correct.

    In second scenerio, when there is no SCP(RIS) or SCP is down...In this
    case what do you mean by modality or SCU creating MPPS SOP instance
    UID, Is it just creating one UID or is it creating MPPS Object(i mean
    is it same as how SCP creates MPPS instance). I got stuck up here..


    Assuming if modality create MPPS instance, then what does this sentence

    mean
    "A system that later N-CREATEs a MPPS SOP Instance
    may use this UID extracted from the related Image SOP Instances".
    MPPS Instance is already created by modality, again who will create or
    which system will create MPPS instance UID.


  2. Re: Re to MPPS Instance

    The modality may not support a MPPS network interface. It is an
    interface which was defined much later than the DICOM image formats.
    The modality will always create images and send them to an external
    DICOM storage application. The statement you cite above is indicating
    the modality is still obligated to generate a UID for the performed
    step and to embed that UID in the image headers, even when the modality
    doesn't support the DICOM MPPS network interface for communicating the
    MPPS message. This will allow a system receiving the images to create
    the database/information entity artifacts AS IF it had received the
    MPPS messages directly, even though the messages were in fact never
    actually sent. Basically it is saying the information entity still
    exists, even if modality didn't/couldn't send the messages


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