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).

It is possible to query for Patient Information using a DICOM C-FIND operation with Modality as a filter, in order to find all patients who have ever had a series with a particular modality.

Formats allowed when specifying the Date/Time range in a Query:

Note: This page applies only to the COM version of DicomObjects - the threading model of the equivalent DicomAssociation object in the .

There are many times when users need to know how many objects there of a given type, without needing to enumerate each one.

Relational Queries have been in the DICOM standard since the start, but are supported by only about half the PACS in the world.