PS 3.7 of the DICOM Standard specifies both the service and protocol used by an application in a medical imaging environment to exchange Messages over the communications support services defined in PS 3.8. A Message is composed of a Command Stream defined in PS 3.7 followed by an optional Data Stream as defined in PS 3.5.
PS 3.7 specifies:
— the operations and notifications (DIMSE Services) made available to Service Classes defined in PS 3.4,
— rules to establish and terminate associations provided by the communications support specified in PS 3.8, and the impact on outstanding transactions
— rules that govern the exchange of Command requests and responses
— encoding rules necessary to construct Command Streams and Messages.