VCT Vision ELITE Series Dokumentacja Pobierz pdf (Strona 103)

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7.2.2 Functional Definition of AEs

The PPS Server AE is implemented as an application process on the scanner host

computer. It runs as a daemon serving requests from other applications to send the PPS

information to the remote AE and return the results to the requesting application.

The PPS Server AE initiates the following functions.

• Start PPS: Initiates a DICOM association in order to create a DICOM Modality

Performed Procedure Step SOP instance in the remote AE. If the remote AE accepts

a presentation context applicable to Modality performed Procedure Step, the PPS

Server AE will issue a request to create the SOP instance in the remote AE via the N-

CREATE service.

• Complete PPS: Initiates a DICOM association in order to update a DICOM Modality

Performed Step instance that is already created with the remote AE. If the remote AE

accepts a presentation context applicable to Modality performed Procedure Step, the

PPS Server AE will issue a request to update the SOP instance in the remote AE via

the N-SET service. The PPS Status is set to ‘COMPLETED’.

• Discontinue PPS: Initiates a DICOM association in order to update a DICOM Modality

Performed Step instance that is already created with the remote AE. If the remote AE

accepts a presentation context applicable to Modality performed Procedure Step, the

PPS Server AE will issue a request to update the SOP instance in the remote AE via

the N-SET service. The PPS Status is set to ‘DISCONTINUED’.

7.2.3 Sequencing of Real-World Activities

7.2.3.1 PPS from Acquisition System with MWL data

The system has a Modality Worklist Server AE installed. Worklist information is obtained

from HIS/RIS system through the use of Basic Worklist Management Service. Use of the

information retrieved in the creation of Image SOP instance is described in the Modality

Worklist Conformance statement. Use of the information retrieved 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. The system retrieves necessary information related to the

Scheduled Procedure Step from Modality Worklist Server. 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. The DICOM association is closed.

• System includes the necessary information related to Scheduled Procedure Steps and

the Performed procedure Step in the image instances created.

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