F.11.2.1.3 Service Class Provider

The N-CREATE operation allows the SCU to provide to the SCP selected Attribute values for a specific General Purpose Performed Procedure Step SOP Instance. This operation shall be invoked through the use of the DIMSE N-CREATE Service used in conjunction with the appropriate General Purpose Performed Procedure Step SOP Instance.

The SCP shall return, via the N-CREATE response primitive, the N-CREATE Response Status Code applicable to the associated request.

The SCP shall accept N-CREATE request primitives only if the value of the Attribute “General Purpose Performed Procedure Step Status” (0040,4002) is “IN PROGRESS”. If the General Purpose Performed Procedure Step Status attribute has another value, the SCP shall set the failure status code “Invalid attribute value” (Code: 0106H) with an Attribute List.

If the General Purpose Performed Procedure Step SOP Instance is related to a general Purpose Scheduled Procedure Step SOP Instance, then the SCP shall accept N-CREATE request primitives only if the value of the Attribute “General Purpose Scheduled Procedure Step Status” (0040,4001) has the value “IN PROGRESS”. If the General Purpose Scheduled Procedure Step Status attribute has another value, the SCP shall send the failure status code as specified in Section F.11.2.1.4.

If a Referenced General Purpose Scheduled Procedure Step Sequence (0040,4016) item is present in the N-CREATE request, then the Referenced General Purpose Scheduled Procedure Step Transaction UID (0040,4023) contained therein shall be the same as the Transaction UID (0008,1195) that identifies the transaction of the General Purpose Scheduled Procedure Step Status (0040,4001) to “IN PROGRESS”. If the Transaction UIDs do not match, the SCP shall send the failure status code as specified in Section F.11.2.1.4.

Note: In the unscheduled case no related General Purpose Scheduled Procedure Step exists, so the rules for the Transaction UID do not apply.

If a Referenced General Purpose Scheduled Procedure Step Sequence (0040,4016) item is present in the N-CREATE request, the SCP shall update the Attribute Resulting General Purpose Performed Procedure Steps Sequence (0040,4015) in the identified General Purpose Scheduled Procedure Step SOP Instance.

Note: The SCP may update the scheduling information on which the General Purpose Worklist is based, including the values of Study Date (0008,0020) and Study Time (0008,0030) using the earliest corresponding values of Performed Procedure Step Date (0040,0244) and Performed Procedure Step Time (0040,0245), in order to achieve consistency of Study level attributes when multiple procedure steps are performed on different devices.