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British Journal of Radiology (1996) 69, 70-71
© 1996 British Institute of Radiology
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The British Journal of Radiology, Vol 69, Issue 817 70-71, Copyright © 1996 by British Institute of Radiology

ARTICLES

Short communication: portal imaging with film-cassette combinations: what film should we use?

R Roberts
Department of Medical Physics, Oxford Radcliffe Hospital, UK.

A large number of commercially available X-ray films were obtained to assess their suitability for megavoltage radiotherapy portal imaging. The speed (represented by optimum film dose), gamma (gamma) and latitude of all these films were determined. Films with high gamma values are recommended for clinical use to maximize the low levels of radiation contrast produced by a megavoltage beam.


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