Already stored - which tags are relevant for that?

Hi,

I have a case where a C-STORE request is answered with “Already stored” by Orthanc. I guess it depends comparison of certain DICOM tags if an instance is treated as new or already stored. Ist there a list of all tags that Orthanc checks for this decision?

And a second question in this wider context. Is it correct that the StudyID is typically set and enforced in the worklist (i.e. by the system requesting the examination) while the SeriesID and the InstanceID is always set by the modality? And if yes, is it defined in DICOM standard how a modality has to set the StudyID if it was not passed via worklist?

Thanks in advance
Torsten

Hello,

I have a case where a C-STORE request is answered with “Already stored” by Orthanc. I guess it depends comparison of certain DICOM tags if an instance is treated as new or already stored. Ist there a list of all tags that Orthanc checks for this decision?

This topic is discussed at the following location of the Orthanc Book:
http://book.orthanc-server.com/faq/orthanc-ids.html

And a second question in this wider context. Is it correct that the StudyID is typically set and enforced in the worklist (i.e. by the system requesting the examination) while the SeriesID and the InstanceID is always set by the modality? And if yes, is it defined in DICOM standard how a modality has to set the StudyID if it was not passed via worklist?

This second question should rather be asked to the official forum about the DICOM standard:
https://groups.google.com/forum/#!forum/comp.protocols.dicom

HTH,
Sébastien-