QC for R/T CT Scanning
Laser - scan plane alignment ? 2 mm
Alignment of scan plane lasers ? 10
Couch deflection under load ? 2 mm
Couch position registration ? 1 mm
Distance accuracy in scan plane ? 2 mm
Imaged slice location ? 1 mm
CT number constancy ? 1% (water)
From: Physics Aspects of Quality Control in Raditherapy,
IPEM Report No. 81, chapter 3.