K.6.2.2.1 E/R Model

In response to a given C-FIND request, the General Purpose Worklist SCP might have to send several C-FIND responses, (i.e. one C-FIND response per matching worklist item). Each worklist item focuses on a single General Purpose Scheduled Procedure Step and the related information. The E-R diagram presented in Figure K.6-2 depicts the content of one C-FIND request, that is:

- the matching General Purpose Scheduled Procedure Step, the list of Requested Procedures to which the General Purpose Scheduled Procedure Step contributes, the Imaging Service Request(s) in which the associated Requested Procedures are ordered, and the Patient of interest.

Therefore, for a given C-FIND request, a given General Purpose Scheduled Procedure Step will appear in only one of the resulting C-FIND responses. Obviously, information about the Requested Procedures, Imaging Service Requests, and Patients may be mentioned in several of these C-FIND responses.

In the Entity-Relationship Model, one Attribute shall be defined as the Unique Key for the General Purpose Scheduled Procedure Step. A single value in a Unique Key Attribute shall uniquely identify a single entity. That is, two entities may not have the same Unique Key value.

Note: The Unique Key in this case is the SOP Instance UID of the General Purpose Scheduled Procedure Step Instance. See Table K.6-2.

The worklist provider shall support existence and matching of the Unique Key defined by the General Purpose Worklist Information Model. All entities managed by the worklist provider shall have a specific non-zero length Unique Key value.

Unique Keys may be contained in the Identifier of a C-FIND request.

The General Purpose Worklist Information Model is represented by the Entity Relationship diagram shown in figure K.6-2.

The entry point of the General Purpose Worklist is the General Purpose Scheduled Procedure Step entity.

The attributes of a General Purpose Worklist can be found in

PS 3.3 "Patient Relationship Module"

PS 3.3 "Patient Identification Module"

PS 3.3 "Patient Demographic Module"

PS 3.3 "Patient Medical Module"

PS 3.3 "General Purpose Scheduled Procedure Step Relationship Module"

PS 3.3 "General Purpose Scheduled Procedure Step Information Module"

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Figure K.6-2.

General Purpose Worklist Information Model E-R Diagram