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New calculation method for 3D dose distribution in tetrahedral-mesh phantoms in Geant4

Authors
 Min Cheol Han  ;  Youngmo Ku  ;  Hyun Su Lee  ;  Yeon Soo Yeom  ;  Haegin Han  ;  Chan Hyeong Kim 
Citation
 PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS, Vol.66 : 97-103, 2019-10 
Journal Title
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
ISSN
 1120-1797 
Issue Date
2019-10
Keywords
Tetrahedral-mesh ; Computational phantom ; 3D dose distribution ; Monte Carlo ; Geant4
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.
Full Text
https://www.sciencedirect.com/science/article/pii/S1120179719304466
DOI
10.1016/j.ejmp.2019.09.239
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Han, Min Cheol(한민철)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/189216
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