MRI Alignment Issue in OHIF: Direct DICOM Send vs Manual Upload from Scanner

General
1

Hi everyone,

I am facing a strange issue with Orthanc and OHIF and would appreciate any guidance.

My setup

  • MRI Scanner → Local Orthanc (installed at the client site)

  • Local Orthanc routes studies to our cloud Orthanc using Orthanc Peer (Lua script)

  • OHIF is integrated as an Orthanc plugin on the cloud server.

The issue

For some MRI studies, when the scanner sends the images directly to the local Orthanc via DICOM C-STORE, the study shows an alignment/misalignment issue in OHIF after being routed to the cloud Orthanc.

However, if I export the same study from the MRI scanner console as DICOM files and manually upload those files to Orthanc, the alignment issue disappears and the images display correctly in OHIF.

What I have verified

  • The same cloud Orthanc server is used in both cases.

  • The same OHIF viewer is used in both cases.

  • The issue only occurs with studies received through the scanner’s DICOM send.

  • The manually exported DICOM files from the scanner work correctly.

Routing

The local Orthanc routes studies to the cloud Orthanc using Orthanc Peer through a Lua script.