在精确放射治疗中,精确计算楔形挡板的楔形因子是精确修正加入楔形挡板后剂量值的关键.提出了基于衰减系数法思想的改进楔形野剂量修正算法,首先计算了楔形挡板材料的线性衰减系数,再根据楔形挡板的实际剖面尺寸,建立了线性拟合公式计算射线束穿过楔形挡板的实际厚度,精确计算楔形因子,并以AAPM55号报告提供的45°楔形挡板进行了验证.该方法在保证计算精度的同时减少了大量离轴测量数据,减轻了物理师的负担,可以作为一种有效的楔形挡板修正算法应用于放射治疗计划系统中.
In accuracy radiotherapy,it is difficult to calculate dose accurately during wedge fields.In this paper,an improved corrected algorithm of wedges based on the line-attenuation was proposed.The line-attenuation coefficient of wedges was calculated firstly,then the actual path of radial beam in the wedge was calculated by the "linear fitting" according to the sizes of wedges section.Finally the wedge factors could be determined accurately,and the dose could be corrected.The data of the 45 degree wedge in the report of AAPM 55 were used to make the calculation and verificaton.Using this algorithm,amount of measured data were decreased,the accuracy of calculation could be assured,and the job of physician could be reduced,so this algorithm could be applied in the treatment planning system as an effective calculation method of wedges field.
参考文献
| [1] | Wu Yican,Li Guoli,Tao Shengxiang,et al,Chinese Journal of Medical Physics,2005,22(6):283(in Chinese).(吴宜灿,李国丽,陶声祥等.中国医学物理学杂志,2005,22(6):283.) |
| [2] | Wu Yican,Song Gang.Cao Ruifen,et al.Chinese Physics C(HEP & NP),2008,32(Suppl.Ⅱ):177. |
| [3] | Lin Hui.The Dose Calculation Method of the Crucial Techniques for Accurate Radiotherapy(Dissertation of Doctor).Hefei:Institutes of Physical Science Chinese Academy of Sciences,2007(in Chinese).(林辉.精确放疗关键技术之剂量计算方法的研究(博士论文).合肥:中国科学院物质科学研究院,2007.) |
| [4] | Lin Hui,Xu Liangfeng,Xu Yuanying,et al.Nuclear Physics Review,2007,24(4):299(in Chinese).(林辉,许良凤,徐元英等.原子核物理评论,2007,24(4):299.) |
| [5] | Lin Hui.Cheng Dongying,Wu Dongsheng,et al.Nuclear Physics Review,2008,25(2):154(in Chinese).(林辉,陈冬颖,吴东升等.原子核物理评论,2008,25(2):154.) |
| [6] | Song Gang.Hybrid Dose Calculation Research and Program Development for Accurate Radiotherapy(Dissertation of Doctor).Hefei:Institutes of Physical Science Chinese Academy of Sciences,2008(in Chinese).(宋钢.精确放射治疗中混合剂量计算方法及软件系统设计研究(博士论文).合肥:中国科学院物质科学研究院,2008.) |
| [7] | Gao Lingyuan,Zheng Zizhu,Chen Bingzhou,et al.Nuclear Physics Review,2007,24(4):304(in Chinese).(高玲媛,张紫竹,陈炳周等.原子核物理评论,2007,24(4):304.) |
| [8] | Hu Yimin,Radiation Oncology Physics.Beijing:Atomic Energy Press,1998,184-187(in Chinese).(胡逸民.肿瘤放射物理学.北京;原子能出版社,1998,184-187.) |
| [9] | Deng Chunlian.Hainan Medical Journal,2007,18(11):179(in Chinese).(邓春涟.海南医学,2007,18(11):179.) |
| [10] | Yang Dailun,Luo Zhengming.Journal of Sichuan University(Natural Science Edition),2003,40(5):901(in Chinese).(杨代伦,罗正明.四川大学学报(自然科学版),2003,40(5):901.) |
| [11] | ICRU,Determination of Absorbed Dose in a Patient Irradiated by Beams of X or Gamma Rays in Radiotherapy Procedures.ICRU Report 24,1976. |
| [12] | Tao Jianmin,Hu Ji,Zhang Ying,et al.Journal of Tongjji University(Medical Science),2003,24(6):465(in Chinese).(陶建明,胡杰,张莹等.同济大学学报(医学版),2003,24(6):467.) |
| [13] | Lin Hui,Wu Yican,Chen Yixue.Phys Med Biol,2006,51:13. |
| [14] | Song Gang.Development of RBM Dose Engine for Accurate Radiotherapy Planning System(Dissertation of Master).Hefei:Hefei University of Technology,2005(in Chinese).(宋钢.放疗计划系统中RBM剂量计算方法的研究(硕士论文).合肥:合肥工业大学,2005.) |
| [15] | Chen Chaobin,Huang Qunying,Wu Yican.Plasma Science & Technology,2005,7(2):2777. |
| [16] | Chen Chaobin.The Application of Monte Carlo Method in Dose Calculation in Radiotherapy(Dissertation of Master).Hefei:Institutes of Physical Science Chinese Academy of Sciences,2004(in Chinese).(陈朝斌.蒙特卡罗方法在放疗剂量计算中的应用研究(硕士论文).合肥:中国科学院合肥物质科学院,2004.) |
| [17] | Jiang Haiyan.The Monte Carlo Simulation and Analysis of the Damage to the Cell in Boron Neutron Capture Therapy(Dissertation of Master).Hefei:Hefei University of Technology,2004(in Chinese).(江海燕.硼中子俘获治疗中细胞损伤的Monte Carlo(硕士论文).合肥:合肥工业大学,2004.) |
| [18] | AAPM.AAPM Report No.55,1995. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%