Hello,
There is a tag at the series level named “ExpectedNumberOfInstances” bt unfortunately in the 100+ studies I have from different modalities none of the series in those studies has this tag populated ie the value is NULL. Any idea why this might be?
In general, the number of instances in a DICOM series is not available as a DICOM tag. Orthanc does its best to guess this number, but it is generally not available, hence the absence of the “ExpectedNumberOfInstances” information.
For more information, check out the source code:
https://bitbucket.org/sjodogne/orthanc/src/Orthanc-1.5.6/OrthancServer/ServerIndex.cpp#lines-504