The requesting system is an application capable of making HTTP Service requests and able to process data encoded as a DICOM File, per DICOM PS3.10 encodings.
Requesting information for DICOM Instances may come from a wide variety of forms. It is expected to include at least the Study UID. This may be encoded as part of an HL7 reference within a CDA document, a DICOM SOP Instance reference, or other formats.
The request specifies
Requested Data set
Study UID
Optionally, it may also specify subset information
Series UID
SOP Instance UID
The response provides
SOP Instances, encoded per DICOM PS3.10.