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Medical Physics

Winston-Lutz 2D

Isocentre check from EPID DICOM images: beam / mechanical isocentre alignment.

Winston-Lutz 2D — Kaptan Data Solutions

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Upload an EPID image, or pick a demo image, to see the results here.

How it works

  1. Upload one EPID image of the Winston-Lutz phantom, exported as DICOM.
  2. pylinac locates the radiation field centre (CAX) and the BB, and measures the 2D distance between them, as well as the offset of the field centre from the EPID centre.
  3. The image passes if the CAX-to-BB distance is within your tolerance. Gantry, collimator and couch angles are read from the DICOM header.

To combine several gantry, collimator and couch angles into a 3D isocentre, use Winston-Lutz 3D. Documentation: pylinac Winston-Lutz.