Korean J Med Phys.
2008 Jun;19(2):131-138.
Accuracy Evaluation of Treatment Planning System Using Irregular-surface Water Phantom
- Affiliations
-
- 1Department of Radiation Oncology, Wonkwang University, School of Medicine, Iksan, Korea.
- 2Institute of Wonkwang Medical Science, Iksan, Korea.
- 3Research Institute of Clinical Medicine, Chonbuk National University, Jeonju, Korea.
- 4Department of Radiation Oncology, Dankook University Hospital, Chonan, Korea.
- 5Department of Radiation Oncology, Keimyung University Dongsan Medical Center, Daegu, Korea.
- 6Department of Radiation Oncology, Dong-A University Hospital, Busan, Korea.
- 7Cancer Research Institute, Daejeon, Korea. khkim@cnuh.co.kr
- 8Department of Radiation Oncology, College of Medicine, Chungnam National University, Daejeon, Korea.
Abstract
- 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 10x10 cm2 and 20x20 cm2, and MLC-shaped fields for these fields. We measured doses at three depths 5, 10 and 15 cm in phantom of SSD=90 cm 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 +/-1% 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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