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KMID : 0384620080190020131
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Korean Journal of Medical Physics
2008 Volume.19 No. 2 p.131 ~ p.138
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Accuracy Evaluation of Treatment Planning System Using Irregular-surface Water Phantom
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Jeong Dong-Hyeok
Kim Jeung-Kee
Cho Moon-June
Lee Kang-Kyoo
Moon Sung-Rock
Kim Jun-Sang
Kim Ki-Hwan
Kim Jhin-Kee
Shin Kyo-Chul
Oh Young-Kee
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Abstract
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We evaluated on the calculation accuracy of treatment planning system (TPS) with phantom having convex and concave surface. The TPS is Eclipse (Varian, USA) using both algorithms AAA and PBC for photon dose calculations. PBC algorithms have three corrections of Batho, modified Batho (M-Batho), and equivalent TAR (E-TAR). The field sizes were and , and MLC-shaped fields for these fields. We measured doses at three depths 5, 10 and 15cm in phantom of SSD=90cm in the condition of inserted farmer chamber. For given conditions, we have calculated dose with these algorithms and compared them with measured doses. In AAA the calculated doses (dose/MU) were agreed to measured doses within in flat and convex surface and were under estimated with -1.9% maximum in concave surface. In PBC the calculated doses were over estimated with +1.7% and +4.1% respectively in flat and convex surface and the differences were from -3.1% to +2.1% in concave surface. In comparison of criteria from AAPM and IAEA reports, and statistical analysis for these results, it is found that the AAA’s results are in good agreement with measured values and the M-Batho’s results are generally good agreed with measured values among PBC algorithms.
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KEYWORD
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Treatment planning system, Irregular surface, Phantom
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