Off-axis dose response characteristics of an amorphous silicon electronic portal imaging device.

@article{Greer2007OffaxisDR,
  title={Off-axis dose response characteristics of an amorphous silicon electronic portal imaging device.},
  author={Peter B. Greer},
  journal={Medical physics},
  year={2007},
  volume={34 10},
  pages={
          3815-24
        }
}
Amorphous silicon (a-Si) electronic portal imaging devices (EPIDs) have typically been calibrated to dose at central axis (CAX). Division of acquired images by the flood-field (FF) image that corrects for pixel sensitivity variation as well as open field energy-dependent off-axis response variation should result in a flat EPID response over the entire matrix for the same field size. While the beam profile can be reintroduced to the image by an additional correction matrix, the CAX EPID response… CONTINUE READING

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