A test tool for the visual verification of light and radiation fields using film or an electronic portal imaging device.

@article{Dunscombe1999ATT,
  title={A test tool for the visual verification of light and radiation fields using film or an electronic portal imaging device.},
  author={Peter Brian Dunscombe and S S Humphreys and Konrad Leszczynski},
  journal={Medical physics},
  year={1999},
  volume={26 2},
  pages={239-43}
}
We describe the design and evaluation of a simple test tool which can be used in conjunction with either film or an electronic portal imaging device (EPID) to verify light and radiation fields and their congruence. The precision of the technique is better than 0.5 mm under all conditions tested. When used with film the accuracy or offset of the technique… CONTINUE READING