DICOM PS3.4 2020c - Service Class Specifications

5.4 Usage Specification (Current)
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## 5.4 Usage Specification

The building blocks of SOP Classes are Modules and DIMSE Services. The DIMSE Services associated with a SOP Class may be Mandatory (M) or Optional (U). The usage may be different for the SCU and SCP. The usage is specified as a pair of letters: the former indicating the SCU usage, the latter indicating the SCP usage.

### 5.4.1 Use of DIMSE Services

The meaning and behavior of the usage specification for DIMSE Services are:

M/M

  The SCU shall support the DIMSE Service but is not required to use it on an Association. The SCP shall support the DIMSE Service.

U/M

  The SCU may support and use the DIMSE Service. The SCP shall support the DIMSE Service.

U/U

  The SCU may support and use the DIMSE Service. The SCP may support the DIMSE Service. If the SCP does not support the DIMSE Service used by the SCU, it shall return a Failure status.

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DICOM PS3.4 2020c - Service Class Specifications