R.3.2.1.2 Service Class User

The SCU shall specify in the N-CREATE request primitive the SOP Class and SOP Instance UIDs of the Instance Availability Notification SOP Instance which is created and for which Attribute Values are to be provided.

The SCU shall provide Attribute values for the Instance Availability Notification SOP Class Attributes as specified in Table R.3.2-1.

The use of additional optional Attributes by the SCU is forbidden.

Note: The reason for forbidding optional attributes is to prevent the use of Standard Extended SOP Classes that might add contextual information such as patient and procedure identifiers.

The encoding rules for Instance Availability Notification Attributes are specified in the N-CREATE request primitive specification in PS 3.7.

There are no requirements on when N-CREATE requests are required to be performed.

In particular, there are no requirements that notification about the availability of the first instance of a Performed Procedure Step or Study be provided upon its reception, nor that availability notification be provided when an entire set of instances comprising a completed Performed Procedure Step or Study are available, though these are typical and common scenarios.