C.4.3.3.2 Extended Behavior of SCP
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##### C.4.3.3.2 Extended Behavior of SCP

Extended SCP behavior shall be negotiated at Association establishment time. If an option within the extended behavior is not agreed upon in the negotiation, then only baseline SCP behavior shall be performed with respect to that option. Extended SCP behavior includes all baseline behavior with the following option:

- Relational-retrieve

- Enhanced Multi-Frame Image Conversion

More than one option may be agreed upon.

###### C.4.3.3.2.1 Relational-Retrieve

The C-GET Service with relational-retrieve removes the restriction that the SCU supply Unique Key values for levels above the Query/Retrieve level to help identify an entity at the level of the retrieval. Hence, the Identifier of a C-GET request may retrieve:

- all Composite Object Instances related to a study by providing a Study Instance UID

- all Composite Object Instances related to a series by providing a Series Instance UID

- individual Composite Object Instances by providing a list of SOP Instance UIDs

###### C.4.3.3.2.2 Enhanced Multi-Frame Image Conversion

If Query/Retrieve View (0008,0053) is not present in the Request Identifier, then the SCP shall identify a set of Entities at the level of the transfer based upon the values in the Unique Keys in the Identifier of the C-GET request that correspond to the instances it possesses, as received, and shall initiate C-STORE sub-operations for all the corresponding storage SOP Instances.

If Query/Retrieve View (0008,0053) is present with a value of "CLASSIC", then the SCP shall identify a set of Entities at the level of the transfer based upon the values in the Unique Keys in the Identifier of the C-GET request that correspond to the Classic single frame Instances (converted from Enhanced multi-frame Instances if required), as well as any instances that were converted to preserve referential integrity, and any that did not need to be converted, and shall initiate C-STORE sub-operations for all the corresponding storage SOP Instances.

If Query/Retrieve View (0008,0053) is present with a value of "ENHANCED", then the SCP shall identify a set of Entities at the level of the transfer based upon the values in the Unique Keys in the Identifier of the C-GET request that correspond to the Enhanced multi-frame Instances (converted from Classic single frame Instances if required), as well as any instances that were converted to preserve referential integrity, and any that did not need to be converted, and shall initiate C-STORE sub-operations for all the corresponding storage SOP Instances.

### Note

1. The C-GET SCP acting as a C-STORE SCU will not send information that is duplicated to the C-GET SCU acting as a C-STORE SCP. For example, if an entire series of single frame instances can be converted to a separate series of converted instances, a STUDY level C-GET will not send both series.

2. The Query Information Model is unchanged, and the same unique, required and optional keys are equally applicable to both views, except that the values for the SERIES and IMAGE level queries will be different and will depend on the converted instance content.

3. The Query/Retrieve View is still required in an IMAGE or SERIES level request identifier, even though the requested unique key(s) are unambiguous.

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