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Your QA program includes SunCheck Machine Winston-Lutz Isocenter check, as well as Varian's Isocal. Select all true statements about detection of MV Imager origin drift.

Status

Approved

Explanation

The 3D offsets in SunCheck Machine Winston-Lutz Isocenter check tell you how to shift mechanical/imaging isocenter (typically KV imaging origin) so that the radius of the sphere centered at this new shifted point and intersecting all beam axes is minimized. A drift in MV origin is abstracted by Winston-Lutz QA unless physicist goes out of their way to check digital graticule origin distance to ball in MV images as they're obtained in Imaging application.

Tags

• TrueBeam
• Winston-Lutz
• SNC Machine

Answer Options

• MV imager origin drift is flagged by 3D offset parameters in SunCheck Machine Winston-Lutz Isocenter shown in image.
• MV imager origin drift is flagged by Varian's Isocal procedure though of course you're relying on Varian for this check. Correct

Images