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KMID : 0384620120230030188
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Korean Journal of Medical Physics
2012 Volume.23 No. 3 p.188 ~ p.198
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Evaluation of Beam Modeling Using Collapsed Cone Convolution Algorithm for Dose Calculation in Radiation Treatment Planning System
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Jung Joo-Young
Cho Woong
Kim Min-Joo
Lee Jeong-Woo
Suh Tae-Suk
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Abstract
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This study aims to evaluate the accuracy of the collapsed cone convolution (CCC) algorithm for dose calculation in a treatment planning system (TPS), CorePLANTM. We implemented beam models for various setup conditions in TPS and calculated radiation dose using CCC algorithm for 6 MV and 15 MV photon beam in 50×50×50cm3 water phantom. Field sizes were 4×4 cm2, 6×6 cm2, 10×10 cm2, 20×20 cm2, 30×30 cm2 and 40×40cm2 and each case was classified as open beam cases and wedged beam cases, respectively. Generated beam models were evaluated by comparing calculated data and measured data of percent depth dose (PDD) and lateral profile. As a result, PDD showed good agreement within approximately 2% in open beam cases and 3% in wedged beam cases except for build-up region and lateral profile also correspond within approximately 1% in field and 4% in penumbra region. On the other hand, the discrepancies were found approximately 4% in wedged beam cases. This study has demonstrated the accuracy of beam model-based CCC algorithm in CorePLANTM and the most of results from this study were acceptable according to international standards. Although, the area with large dose difference shown in this study was not significant region in clinical field, the result of our studywould open the possibility to apply CorePLANTM into clinical field.
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KEYWORD
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Dose calculation algorithm, Collapsed cone convolution, Treatment planning system, CorePLANTM, Beam model
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