DICOM defines three different hierarchies for image-related Query/Retrieve operations, each of which has different semantics and allowable search levels. The allowable combinations of QueryRoot and QueryLevel are:
Root | PATIENT | STUDY | PATIENTSTUDY |
Permitted Levels |
PATIENT STUDY SERIES IMAGE |
STUDY SERIES IMAGE |
PATIENT STUDY |
In addition, to the above values, Root may be set to “WORKLIST” to indicate a Modality Worklist query, or “GP-WORKLIST” to indicate a General Purpose Worklist query, but if this is done, then a Find must be performed with a DicomDataSet parameter, as the parameters for the query DataSet are very different to those used for the other queries.