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• At the end of image acquisition, system initiates a ‘Complete PPS’ or ‘Discontinue
PPS’ based on the choice selected by the user using the user interface provided. The
user is also given a choice ‘Defer PPS’ which is described below. PPS Server AE
initiates a MPPS N-SET request to the remote AE, in-order to update the MPPS SOP
instance that is already created. The N-SET is sent over a new DICOM association
• The remote AE returns response indicating the success/failure of the request
execution. The PPS state information is updated in the system based on the response
data, and is presented to the user.
• At the end of image acquisition, if the user has chosen ‘Defer PPS’, the user is
provided with an interface to ‘Complete PPS’ or ‘Discontinue PPS’ at any later time.
The user might wish to alter the image set generated through acquisition, before
invoking these operations. Note that the user explicitly uses the user interface
provided to invoke this operation, as in the case of PPS generated for post-
processing, which is described in the following section. PPS messages N-CREATE (
if applicable) and N-SET will be sent over the same DICOM association
• The remote AE returns response indicating the success/failure of the request
execution. The PPS state information is updated in the system based on the response
data, and is presented to the user.
7.2.3.2 PPS from acquisition system without MWL data
The system either does not have a Modality Worklist Server AE installed or a Modality
Worklist Server AE installed but no Worklist information is obtained from HIS/RIS system
for the current procedure that is being performed. The information required for performing
the procedure is supplied through the user interface of the system. The use of this
information in MPPS SOP instances is described later in this document.
• The system initiates a ‘Start PPS’ before starting a scan, i.e. when the image
acquisition is started. PPS Server AE initiates a MPPS (Modality Performed Procedure
Step) N-CREATE request to the remote AE (MPPS SCP), in-order to create a MPPS
SOP instance at the remote AE.
• The MPPS SCP returns response indicating the success/failure of the request
execution. The PPS state information is updated in the system based on the response
data, and is presented to the user.
• System includes the necessary information related to Scheduled Procedure Steps and
the Performed procedure Step in the image instances created.
• At the end of image acquisition, system initiates a ‘Complete PPS’ or ‘Discontinue
PPS’ based on the choice selected by the user using the user interface provided. The
user is also given a choice ‘Defer PPS’ which is described below. PPS Server AE
initiates a MPPS N-SET request to the remote AE, in-order to update the MPPS SOP
instance that is already created.
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