Retrieving by Accession Number
We are sometimes asked how to retrieve as study based on the accession number. This is only possible by doing an initial query to find the StudyUID then using those in a retrieval.
The explanation is that the DICOM rules allow only the Instance UID, Series UID, Study UID and Patient ID to be used in C-MOVE and C-GET requests. If you wish to retrieve a study based on accession number (or anything else except those 4 identifiers).