글로벌 연구동향
의학물리학
- 2019년 12월호
[Phys Med.] New calculation method for 3D dose distribution in tetrahedral-mesh phantoms in Geant4.한양대 / 한민철, 김찬형*
- 출처
- Phys Med.
- 등재일
- 2019 Oct
- 저널이슈번호
- 66:97-103. doi: 10.1016/j.ejmp.2019.09.239. Epub 2019 Oct 1.
- 내용
Abstract
The tetrahedral-mesh (TM) geometry, which is a very promising geometry for computational human phantoms, has a limitation in 3D dose distribution calculation for medical applications. Even though Geant4 provides the read-out geometry for calculating 3D dose distribution in the TM geometry, this method significantly slows down the computation speed. In the present study, we developed a new method, called Moving Voxel-based Dose-Distribution Calculator (MVDDC), to rapidly calculate a 3D dose distribution in a TM geometry. To evaluate the performance of the MVDDC method, a simple TM cubic phantom and a human phantom were implemented in Geant4. Subsequently, the phantoms were irradiated with proton spot beams under various conditions, and the obtained results were compared with those of the read-out geometry method. The results show that there is no significant difference between the dose distributions calculated using the new method and the read-out geometry method. With respect to the computational performance, the speeds of simulations using the MVDDC were approximately 1.4-2.7 times faster than those of the simulations using the read-out geometry method.
Author informationHan MC1, Ku Y2, Lee HS2, Yeom YS3, Han H2, Kim CH4.
1
Department of Radiation Oncology, Yonsei University College of Medicine, Seoul 03722, South Korea.
2
Department of Nuclear Engineering, Hanyang University, Seoul 04763, South Korea.
3
Division of Cancer Epidemiology & Genetics, National Cancer Institute, MD 20892-9760, USA.
4
Department of Nuclear Engineering, Hanyang University, Seoul 04763, South Korea. Electronic address: chkim@hanyang.ac.kr.
- 키워드
- 3D dose distribution; Computational phantom; Geant4; Monte Carlo; Tetrahedral-mesh
- 연구소개
- Geant4 에서 사면체 지오메트리를 이용할 때 내부 선량분포를 moving voxel을 기반으로 빠르게 계산할 수 있는 새로운 선량분포계산 방법론을 개발하였습니다. 새로운 방법론은 기존의 Geant4 내에서 제공하는 Read-out geometry 방법과 비교하여 정확도 측면에서 큰 차이가 없지만 속도 측면에서는 평균적으로 약 1.4-2.7배의 빠른 계산속도를 보였습니다. 본 연구를 통해 개발된 새로운 방법은 향후 Geant4에서 사면체 팬텀을 이용하여 선량분포를 계산하고자 할 때 큰 성능적 향상을 가져올 것이라고 기대합니다.
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