Orthanc QueryRetrieve and Distributed PACS

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1

Hi,

I’m trying to connect Orthanc to a Philipps Intellispace distributed PACS.
A distributed PACS has different AETs for query and retrieve.

Looking at how the Query retrieve mechanism is structured currently

  • I do a /modalities/:aet/query
  • I get a QueryResponse and browse the query
  • I /query/:queryresponse/answers/:answer/retrieve the stuff I like
    It seems like Orthanc expects the AET to be the same for query and retrieve.
    Is this assessment correct or is this possible in Orthanc. If not, is this a feature on the roadmap?

Thanks,
Georg

2

Just add separate entries in the “DicomModalities” configuration option, one for each of the AET that is used by your Philips PACS:
http://book.orthanc-server.com/users/configuration.html

3

Will configuring Orthanc in this way automatically retrieve images from the retrieve AET when I issue the C-FIND from the query AET and retrieve the query?

4

Sorry, but I don’t understand your question

5

Using a Philipps distributed PACS, the workflow when retrieving images is like this:

  1. Issue a C-FIND to AET-QUERY
  2. AET-QUERY will respond and additionally set the tag (0008,0054) Retrieve AE Title
  3. You take the queried InstanceUids to the Retrieve AET (AET-RETRIEVE) to initiate the C-FIND
    The question is, is this behavior (Retrieve AET Tag is respected) implemented in Orthanc?
    Thanks
6
  1. should be C-MOVE, not C-FIND, sorry
7

This is non-standard logic, so you’ll have to manually script Orthanc:

  • Call /modalities/…/find to issue the C-FIND query, taking care of including “0008,0054” in the “Query” field
  • Call /queries/…/answers to inspect the results and retrieve the “0008,0054” tag
  • Lookup /modalities/?expand to find the symbolic name of the modality in Orthanc given its AET
  • Call /modalities/…/move to manually retrieve the DICOM instances

Check out the integration tests to have examples of calls to /modalities/…/move:
https://bitbucket.org/sjodogne/orthanc-tests/src/default/Tests/Tests.py

8

Thanks! I did not know about /modalities/…/move, that answers it. Especially these integration tests documenting it are very helpful.
About the statement that this is non-standard logic, I’m not entirely convinced: especially large hospitals have this form of distributed PACS and the Retrieve AE Title is part of the DICOM standard.
But many thanks for this resource, it helps a lot.

Best Regards,
Georg

9

Dear Georg,

Thanks for your answer. I wasn’t aware of this feature, that is indeed part of the standard for C-FIND:
http://dicom.nema.org/medical/dicom/current/output/html/part04.html#sect_C.4.1.1.3.2

It should be relatively easy to update Orthanc to implement this feature. I have just added a task on our roadmap:
https://bitbucket.org/sjodogne/orthanc/commits/65c49f832da85ab0cee0ad3c7809f2addfcdd304

Regards,
Sébastien-

10

Hi Sebastian,

Any update on this feature within Orthanc? I am looking into connecting Orthanc to distributed PACS.

-Rajshree

11

Hello,

If you look at the TODO file, you’ll see that this feature is implemented on the SCP side (since Orthanc 1.7.3), but not on the SCU side yet:
https://hg.orthanc-server.com/orthanc/file/Orthanc-1.11.0/TODO#l122

  • Support “Retrieve AE Title” (0008,0054) in C-FIND:

Regards,

Sébastien-