Radiology, Vol 138, 735-736, Copyright © 1981 by Radiological Society of North America
A simple system for detecting patient movement during radiation therapy
GS Simpkins, FA Ascoli, DM Sherman and SP Kadish
The authors described a system which detects patient movement while that
patient is undergoing radiation treatment. The system consists of simple
and inexpensive electronic circuitry using the laser localization lights
commonly used with an isocentric linear accelerator. If the patient moves,
a visual or audible signal alerts the radiation-therapy technologist who
can interrupt treatment and reposition the patient. The verification of
proper patient position using this technique compares favorably with the
routine use of cerification radiographs.
