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• W2022821300 endingPage "1953" @default.
• W2022821300 startingPage "1943" @default.
• W2022821300 abstract "Successful radiotherapy requires accurate dosimetry for treatment verification. Existing dosimeters such as ion chambers, TLD, and diodes have drawbacks such as relatively long measurement time and poor spatial resolution. These disadvantages become serious problems for dynamic-wedged beams. Thus the clinical use of dynamic wedges requires an improved dosimetry method. X-ray film may serve this purpose. However, x-ray film is not clinically accepted as a dosimeter for photon beams, because it overresponds to photons with energies below about 400 keV. This paper presents and develops a method which was initially proposed by Burch to improve the dose response of x-ray film in a phantom. The method is based on placing high-atomic number foils next to the film. The foils are used as filters to preferentially remove low-energy photons. The optimal film and filter configuration in a phantom was determined using a mathematical scheme derived in this study and a Monte Carlo technique (ITS code). The optimal configuration thus determined is as follows: the filter-to-film distance of 6 mm and the filter thickness of 0.15 mm for percent depth-dose measurement; the distance of 1 cm and the thickness of 0.25 mm for off-axis (dose) ratio measurement. The configuration was then tested with photon beams from a 4 MV linac. The test result indicates that the in-phantom dose distribution based on the optimal configuration agrees well with those measured by ion chambers." @default.
• W2022821300 created "2016-06-24" @default.
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• W2022821300 date "1997-12-01" @default.
• W2022821300 modified "2023-10-05" @default.
• W2022821300 title "A filtration method for improving film dosimetry in photon radiation therapy" @default.
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• W2022821300 doi "https://doi.org/10.1118/1.598108" @default.
• W2022821300 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9434977" @default.
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