KMID : 0384620120230020099
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Korean Journal of Medical Physics 2012 Volume.23 No. 2 p.99 ~ p.105
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Influence of Couch and Collimator on Dose Distribution of RapidArc Treatment Planning for Prostate Cancer in Radiation Therapy
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Kim Hyung-Dong
Kim Byung-Young Kim Sung-Jin Yun Sang-Mo Kim Sung-Kyu
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Abstract
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We investigated the influence of photon energy, couch and collimator angle differences between arcs on dose distribution of RapidArc treatment planning for prostate cancer. RapidArc plans were created for 6 MV and 10MV photons using 2 arcs coplanar and noncoplanar fields. The collimator angle differences between two arcs were 0o, 15o, 30o, 45o, 60o, 75o and 90o. The plans were optimized using same dose constrains for target and OAR (organ at risk). To evaluate the dose distribution, plans were analyzed using CI (conformity index), HI(homogeneity index), QOC (quality of coverage), etc. Photon energy, couch and collimator angle differences between arcs had a little influence on the target and OAR. The difference of dosimetric indices was less than 3.6% in the target and OAR. However, there was significant increase in the region exposed to low dose. The increase of V15% in the femur was 6.4% (left) and 5.5% (right) for the 6 MV treatment plan and 23.4% (left), 24.1% (right) for the noncoplanar plan. The increase of V10% in the Far Region distant from target was 54.2
cc for the 6 MV photon energy, 343.4 cc for the noncoplanar and 457.8 cc for the no collimator rotation between arcs.
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KEYWORD
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Prostate cancer, RapidArc, Dose distribution, Radiation treatment planning
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