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KMID : 1151820150090050323
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Journal of the Korean Society of Radiology
2015 Volume.9 No. 5 p.323 ~ p.329
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Dose Distribution of Wedge filter by Dose Rate in LINAC
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Gwon Tae-Hyeong
Kim Seung-Uk
Yoon Yong-Hak
Won Do-Yeon
Jeong Kyeong-Hwan
Jung Jae-Eun
Cho June-Ho
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Abstract
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This study is aimed at assessing whether dynamic wedge filters are appropriate to be used instead of physical wedge filters. The X-ray energy generated from linear accelerator is commercialize 6 MV and 10 MV. 15°, 30°, 45°, and 60° of physical wedge filter was irradiated by dose rate 100, 200, 300, 400, 500, and 600 MU/min for each angle and for comparison with a dynamic wedge filter, irradiate 96 times under the same conditions. The measurement conditions are as 100 ㎝ source-film distance and 10 × 10 ㎝ irradiated surface. A developed film was scanned and analyzed after a calibration through a dose analysis program and the dose rate was compared after calculating the standard deviation. Dynamic wedge filters make dose, scattered rays and treatment time reduced and very useful due to less irradiated doses to patients. The errors at each dose rate under the same conditions were irrelevant. Thus, treatment based on a high dose rate depending on the patient is expected to be feasible.
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KEYWORD
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radiation therapy, linear accelerator, wedge filter, dynamic wedge filter, physical wedge filter
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