Optimal Density Assignment to 2D Diode Array Detector for Different Dose Calculation Algorithms in Patient Specific VMAT QA

Park, So-Yeon; Park, Jong Min; Choi, Chang Heon; Chun, Minsoo; Han, Ji Hye; Cho, Jin Dong; Kim, Jung-in

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자료유형: 학술저널

저자정보: Park, So-Yeon (Department of Radiation Oncology, Seoul National University Hospital) Park, Jong Min (Department of Radiation Oncology, Seoul National University Hospital) Choi, Chang Heon (Department of Radiation Oncology, Seoul National University Hospital) Chun, Minsoo (Department of Radiation Oncology, Seoul National University Hospital) Han, Ji Hye (Department of Radiation Oncology, Seoul National University Hospital) Cho, Jin Dong (Department of Radiation Oncology, Seoul National University Hospital) Kim, Jung-in (Department of Radiation Oncology, Seoul National University Hospital)

저널정보: 대한방사선방어학회 방사선방어학회지 방사선방어학회지 제42권 제1호

발행연도: 2017.1

수록면: 9 - 15 (7page)

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Background: The purpose of this study is to assign an appropriate density to virtual phantom for 2D diode array detector with different dose calculation algorithms to guarantee the accuracy of patient-specific QA. Materials and Methods: Ten VMAT plans with 6 MV photon beam and ten VMAT plans with 15 MV photon beam were selected retrospectively. The computed tomography (CT) images of MapCHECK2 with MapPHAN were acquired to design the virtual phantom images. For all plans, dose distributions were calculated for the virtual phantoms with four different materials by AAA and AXB algorithms. The four materials were polystyrene, 455 HU, Jursinic phantom, and PVC. Passing rates for several gamma criteria were calculated by comparing the measured dose distribution with calculated dose distributions of four materials. Results and Discussion: For validation of AXB modeling in clinic, the mean percentages of agreement in the cases of dose difference criteria of 1.0% and 2.0% for 6 MV were $97.2%{\pm}2.3%$, and $99.4%{\pm}1.1%$, respectively while those for 15 MV were $98.5%{\pm}0.85%$ and $99.8%{\pm}0.2%$, respectively. In the case of 2%/2 mm, all mean passing rates were more than 96.0% and 97.2% for 6 MV and 15 MV, respectively, regardless of the virtual phantoms of different materials and dose calculation algorithms. The passing rates in all criteria slightly increased for AXB as well as AAA when using 455 HU rather than polystyrene. Conclusion: The virtual phantom which had a 455 HU values showed high passing rates for all gamma criteria. To guarantee the accuracy of patent-specific VMAT QA, each institution should fine-tune the mass density or HU values of this device.

#Patient-specific QA #Volumetric modulated arc therapy #Dose calculation algorithm #Gamma analysis #Density assignment

참고문헌 (23)

참고문헌 신청

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Park JM / 2014 / Evaluation of treatment plans using various treatment techniques for the radiotherapy of cutaneous Kaposi's sarcoma developed on the skin of feet / J. Appl. Clin. Med. Phys 15(6):173~187

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Hosang Jin / 2014 / A Comparison Study of Volumetric Modulated Arc Therapy Quality Assurances Using Portal Dosimetry and MapCHECK 2 / 의학물리 25(2):65~71

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