Hello,
There used to be a project ten years ago that was named Orthanc4vet. There has been some interaction on this forum. However, as far as I can tell, the project seems abandoned.
The Orthanc Explorer 2 Web interface might be sufficient for your use cases.
Regarding HL7 integration, as indicated by Alain, you’ll need to write code specific to your workflow. A good way to achieve this is to use the python-hl7 library inside a Python plugin for Orthanc.
Most probably, no. For importing DICOM data from proprietary software, check out the ImportDicomFiles sample script that is part of the Orthanc distribution.
Regards,
Sébastien-