15.3 Transactions Overview

15.3 Transactions Overview (Current)
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The Modality Performed Procedure Step Service consists of the Transactions listed in Table 15.3-1.

Table 15.3-1. Modality Performed Procedure Step Service Transactions

Transaction Name	Method	Payload		Description
Transaction Name	Method	Request	Success Response	Description
Create	POST	Data Set according to Table F.7.2-1 in PS3.4 (N-CREATE)	none	Creates a new Modality Performed Procedure Step
Update	POST	Data Set according to Table F.7.2-1 in PS3.4 (N-SET)	none	Updates the target Modality Performed Procedure Step
Retrieve	GET	none	Data Set according to Table F.8.2-1 in PS3.4	Retrieves the target Modality Performed Procedure Step

In Table 15.3-2, the Target Resources permitted for each Transaction are marked with M if support is mandatory for the origin server and O if it is optional. A blank cell indicates that the resource is not allowed in the Transaction.

Table 15.3-2. Resources by Transaction

Resource	Create	Update	Retrieve
MPPS	M	M	O

Table 15.3-3 lists the Modality Performed Procedure Step Service Transactions that have a corresponding DIMSE Operation in DIMSE MPPS.

Table 15.3-3. Mapping of Modality Performed Procedure Step Service Transactions and DIMSE Operations

Transaction	Operation	Reference	DIMSE Service
Create	Create MPPS Instance	Section F.7.2.1 in PS3.4	N-CREATE
Update	Set MPPS Information	Section F.7.2.2 in PS3.4	N-SET
Retrieve	Get MPPS Information	Section F.8.2.1 in PS3.4	N-GET

Note

As in DIMSE, the Transactions do not provide a complete CRUDL interface for the respective resources. For instance, it is not possible to list all Modality Performed Procedure Steps using DICOM, neither with DIMSE, nor with DICOMweb. What DICOM does provide is access to performed procedure steps at the level required for modalities.

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