Earticle

초록

영어

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% ± 2.3%, and 99.4% ± 1.1%, respectively while those for 15 MV were 98.5% ± 0.85% and 99.8% ± 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.

목차

ABSTRACT
 Introduction
 Materials and Methods
  1. Commissioning of Acuros XB dose calculation algorithm in water phantom
  2. Different materials of MapCHECK2 with MapPHAN
  3. Gamma evaluation
 Results and Discussion
  1. Commissioning of Acuros XB dose calculation algorithm in water phantom
  2. Different materials of the virtual phantom
  3. Gamma evaluation
 Conclusion
 Acknowledgements
 References

키워드

저자

• So-Yeon Park [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea ]
• Jong Min Park [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; 3Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea; Center for Convergence Research on Robotics, Advanced Institutes of Convergence Technology, Suwon, Korea ]
• Chang Heon Choi [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea ]
• Minsoo Chun [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea, Program in Radiation Applied Life Science, Seoul National University College of Medicine, Seoul, Korea ]
• Ji Hye Han [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea ]
• Jin Dong Cho [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea ]
• Jung-in Kim [ Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea; Biomedical Research Institute, Seoul National University College of Medicine, Seoul, Korea ] Corresponding author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629