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A Study on the Additional Absorbed Dose of Normal Tissues by Image Guided Radiation Therapy(IGRT)
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 Title & Authors
A Study on the Additional Absorbed Dose of Normal Tissues by Image Guided Radiation Therapy(IGRT)
Kim, Gha-Jung; Ryu, Jun-Min; Choi, Jun-Gu; Hong, Dong-Hee;
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The recent radiation therapy field can provide treatment which guarantees a high degree of accuracy, due to patient set-up using various image guided radiation therapy(IGRT) instruments. But the additional absorbed dose to patient's normal tissues is increasing. Therefore, this study measured the absorbed dose to surrounding normal tissues which is caused by patient set-up using OBI, CBCT, ExacTrac, among various IGRT instruments. The absorbed dose to the head, the chest, the abdomen, and the pelvis from CBCT was 12.57 mGy, 20.82 mGy, 82.93 mGy, and 52.70 mGy, respectively. Also, the absorbed dose from OBI and ExacTrac ranged from 0.76 to 8.58 mGy and from 0.14 to 0.63 mGy, respectively. As a result, CBCT's absorbed dose was far higher than other instruments. CBCT's surface dose was far higher than others, too, but OBI's entrance skin dose was almost the same as CBCT's.
Image Guided Radiation Therapy(IGRT);OBI;CBCT;ExacTrac;
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