Pencil beam kernel-based method for fast dose calculation(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2019年第12期
- Page:
- 1383-1389
- Research Field:
- 医学放射物理
- Publishing date:
Info
- Title:
- Pencil beam kernel-based method for fast dose calculation
- Author(s):
- MAO Kaina1; 2; ZHANG Pengcheng1; 2; GUI Zhiguo1; 2
- 1. School of Information and Communication Engineering, North University of China, Taiyuan 030051, China; 2. Shanxi Provincial Key Laboratory for Biomedical Imaging and Big Data (North University of China), Taiyuan 030051, China
- Keywords:
- Keywords: pencil beam kernel; dose calculation; spherical shell coordinate system; collision point; correction factor
- PACS:
- R318；R811.1
- DOI:
- DOI:10.3969/j.issn.1005-202X.2019.12.004
- Abstract:
- Abstract: Considering the complicated calculation process and slow speed of the traditional pencil beam kernel dose algorithm, a fast dose calculation method based on pencil beam kernel is proposed. In the spherical shell coordinate system, the similarity of the intersection between the axis and the voxel after the beam collision with different spherical shells is analyzed, and only the intersection of the axis and the voxel at the initial spherical shell collision point is calculated for each beam. Moreover, the ratio of the initial spherical shell depth to the other spherical shell depths is taken as a correction factor to obtain the intersection of the axis and the voxel at the collision point of the other layer. The method can be used to save a lot of time without affecting the algorithm accuracy by avoiding the repeated use of ray tracing method. The experimental results show that when the depth dose distribution is calculated at the different field sizes of (3×3), (5×5) and (10×10) cm2 of water phantoms, the calculation accuracies of two algorithms are basically the same, but the calculation speed of the improved algorithm is improved by about 2.7 times. Meanwhile, when the field size is (10×10) cm2, the calculation accuracies of the improved algorithm and the traditional algorithm are basically similar in the calculation of the profile dose of lung block phantom and bone block phantom, but the calculation speed of the proposed method is improved by about 2.6 times.
Last Update: 2019-12-24