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Radiochromic film as a radiotherapy surface-dose detector
M J Butson1, J N Mathur, P E Metcalfe
1Illawarra Cancer Care Centre, Department of Radiotherapy, Wollongong NSW, Australia.
Physics in Medicine and Biology
|June 1, 1996
Abstract:
Radiochromic film is shown to be a useful surface-dose detector for radiotherapy x-ray beams. Central-axis percentage surface-dose results as measured by Gafchromic film for a 6 MVp x-ray beam produced by a Varian 2100C Linac at 100 cm SSD are 16%, 25%, 35%, 41% for 10, 20, 30 and 40 cm square field sizes, respectively. Using a simple, uniform light source and a CCD camera connected to an image analysis system, quantitative 3D surface doses are accurately attainable in real time as either numerical data, a black-and-white image or a colour-enhanced image.