251. New calculation method for 3D dose distribution in tetrahedral-mesh phantoms in Geant4.
- Author
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Han MC, Ku Y, Lee HS, Yeom YS, Han H, and Kim CH
- Subjects
- Radiotherapy Planning, Computer-Assisted, Time Factors, Monte Carlo Method, Phantoms, Imaging, Radiometry instrumentation
- 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., (Copyright © 2019 Associazione Italiana di Fisica Medica. All rights reserved.)
- Published
- 2019
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