[1]毛凯娜,张鹏程,桂志国.一种基于笔形束核的快速剂量计算方法[J].中国医学物理学杂志,2019,36(12):1383-1389.[doi:DOI:10.3969/j.issn.1005-202X.2019.12.004]
　MAO Kaina,ZHANG Pengcheng,et al.Pencil beam kernel-based method for fast dose calculation[J].Chinese Journal of Medical Physics,2019,36(12):1383-1389.[doi:DOI:10.3969/j.issn.1005-202X.2019.12.004]
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一种基于笔形束核的快速剂量计算方法()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
36卷
期数:
2019年第12期
页码:
1383-1389
栏目:
医学放射物理
出版日期:
2019-12-25

文章信息/Info

Title:
Pencil beam kernel-based method for fast dose calculation
文章编号:
1005-202X（2019）12-1383-07
作者:
毛凯娜1; 2; 张鹏程1; 2; 桂志国1; 2
1.中北大学信息与通信工程学院， 山西 太原 030051； 2.生物医学成像与影像大数据山西省重点实验室（中北大学）， 山西 太原 030051
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
关键词:
笔形束核; 剂量计算; 球壳坐标系; 碰撞点; 校正因子
Keywords:
Keywords: pencil beam kernel;  dose calculation;  spherical shell coordinate system;  collision point;  correction factor
分类号:
R318；R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2019.12.004
文献标志码:
A
摘要:
针对传统笔形束核剂量算法计算过程复杂、速度较慢的问题，提出一种基于笔形束核的快速剂量计算方法。该方法在球壳坐标系下，利用射束与不同球壳层碰撞后轴线与体素相交情况的相似性，通过对每条射束只计算初始球壳层碰撞点处轴线与体素的相交情况，并将初始球壳层深度与其它球壳层深度的比值作为校正因子得到其他层碰撞点处轴线与体素的相交情况。避免射线追踪法的重复使用，在不影响算法精度的情况下节省大量时间。实验结果表明：在不同射野大小［（3×3）、（5×5）、（10×10） cm2］的水模体中计算深度剂量分布，两种算法的计算精度基本一致，改进算法的计算速度提升约2.7倍。同时当射野面积为（10×10） cm2时，在肺阻块模体和骨阻块模体不同深度的剖面剂量计算中，改进算法与传统算法的计算精度也基本一致，但计算速度提升约2.6倍。
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.

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备注/Memo

备注/Memo:
【收稿日期】2019-07-11 【基金项目】国家自然科学基金（11605160）；山西省回国留学人员科研资助项目（2016-089） 【作者简介】毛凯娜，硕士，主要研究方向：放射治疗剂量计算，E-mail:553836391@qq.com 【通信作者】桂志国，博士，教授，主要研究方向：信号与信息处理、图像处理和识别、图像重建，E-mail: gzgtg@163.com
更新日期/Last Update: 2019-12-24