When supported by an SCP, these are handled just like required keys, and most decent PACS support a list larger than the DICOM minimum. The list is however quite small, and many commonly used attributes such as study description are notably absent. Support for these is mandated in DICOM, and it includes for instance Name at patient level, or Modality at series level. This is the PatientID, StudyUID, SeriesUID or InstanceUID Required Keys Those that are appropriate for the “level” of the query (PATIENT, STUDY, SERIES or IMAGE) DICOM defines 4 types of attribute for each level: This is because the server is not expected to touch the image itself merely to answer a query - only the information from the PACS index is used. Those that are stored/indexed by the server and which it chooses to make available through Q/R< There are 2 factors constraining the attributes that can be retrieved in a query: What attributes can be requested in a Query? It uses the C-FIND operation (and was originally the only service using that operation, so this query service is often called just C-FIND, despite that fact that the C-FIND operation is also used for other services such as Modality Worklist). A “normal” DICOM Query, as part of the Query/Retrieve service, is used to ask about the patients, studies, series or images known to a Q/R SCP (normally a PACS).
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June 2023
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