DIMSE provides two types of information transfer services which are used by DICOM Application Entities:
a) a notification service
b) an operation service
Figure 7-1 DIMSE SERVICE PRIMITIVES
Notification services enable one DICOM Application Entity to notify another about the occurrence of an event or change of state. The definition of the notification and the consequent behavior of the Application Entities is dependent upon the Service Class and Information Object Definitions. See PS 3.3 and PS 3.4.
Operation services enable one DICOM Application Entity to explicitly request an operation to be performed upon a SOP Instance managed by another DICOM Application Entity.