Y.4.2.2 C-GET SCU Behavior
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#### Y.4.2.2 C-GET SCU Behavior

##### Y.4.2.2.1 Baseline Behavior of SCU

An SCU conveys the following semantics with a C-GET request:

- If the Retrieve Level (0000,0052) is IMAGE, the SCU shall specify one SOP Instance UID or a list of SOP Instance UIDs.

- If the Retrieve Level (0000,0052) is FRAME, the SCU shall specify the single SOP Instance UID of the item from which the new Composite SOP Instance should be extracted and the Requested Frame List. The Requested Frame List shall be constructed as a Frame List as defined in Section Y.3.2.

- The SCU shall have proposed sufficient presentation contexts at Association establishment time to accommodate expected C-STORE sub-operations that will occur over the same Association. The SCU of the Query/Retrieve Service Class shall serve as the SCP of the Storage Service Class.

- The SCU shall accept C-GET responses with status equal to Pending during the processing of the C-STORE sub-operations. These responses indicate the number of Remaining, Completed, Failed and Warning C-STORE sub-operations.

- The SCU shall interpret a C-GET response with a status equal to Success, Warning, Failure, or Refused as a final response. The final response indicates the number of Completed sub-operations and the number of Failed C-STORE sub-operations resulting from the C-GET operation. The SCU shall interpret a status of:

  - Success to indicate that all sub-operations were successfully completed

  - Failure or Refused to indicate all sub-operations were unsuccessful

  - Warning in all other cases. The Number of Completed Sub-Operations (0000,1021), Number of Warning Sub-Operations (0000,1023), Number of Failed Sub-Operations (0000,1022) can be used to obtain more detailed information.

- The SCU may cancel the C-GET operation by issuing a C-GET-CANCEL request at any time during the processing of the C-GET request. A C-GET response with a status of Canceled shall indicate to the SCU that the retrieve was canceled. Optionally, the C-GET response with a status of Canceled shall indicate the number of Completed, Failed, and Warning C-STORE sub-operations. If present, the Remaining sub-operations count shall contain the number of C-STORE sub-operations that were not initiated due to the C-GET-CANCEL request.

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