| 治疗床两侧金属C型臂对吸收剂量的影响 |
| |
| 引用本文： | 葛宁,王运来,陈福慈,张继青.治疗床两侧金属C型臂对吸收剂量的影响[J].中国医学物理学杂志,2011,28(3):2612-2615,2620. |
| |
| 作者姓名： | 葛宁 王运来 陈福慈 张继青 |
| |
| 作者单位： | 1. 广州军区武汉总医院,放疗科,湖北,武汉,430070
2. 解放军总医院,放疗科,北京,100853 |
| |
| 摘 要： | 目的:研究加速器治疗床两侧金属C型臂对吸收剂量的影响。方法:测量模体置于治疗床板中央,电离室插孔到床板距离分别为5 cm和10 cm。右侧C型臂分别置于7个不同角度,确定不同面积射野经过C型臂时的机架角度。利用0.6 cc电离室测量6 MV和15 MV X线经过C型臂后固定野照射吸收剂量的变化,以及C型臂位置对旋转照射吸收剂量的影响。结果:机架角为90°～180°,治疗床右侧C型臂位于R7位置时,机架角度布野受限范围最大;机架角布野受限范围随射野面积的增大而增大,随治疗深度的减小而增大。对固定野照射,射线能量越小,吸收剂量的衰减越大;射线穿过C型臂的距离越大,吸收剂量的衰减越大;旋转照射时C型臂位置越靠近床板中心轴,吸收剂量衰减越大。结论:治疗床两侧金属C型臂对射线有衰减和散射,造成吸收剂量及其分布发生变化。治疗计划设计和患者摆位时应尽量避开金属C型臂。
|
| 关 键 词： | 放射治疗 C型臂 吸收剂量 机架角 |
Dosimetric Evaluation of Metal C-arm for Precise Tabletop |
| |
| GE Ning,WANG Yun-lai,CHEN Fu-ci,ZHANG Ji-qing.Dosimetric Evaluation of Metal C-arm for Precise Tabletop[J].Chinese Journal of Medical Physics,2011,28(3):2612-2615,2620. |
| |
| Authors: | GE Ning WANG Yun-lai CHEN Fu-ci ZHANG Ji-qing |
| |
| Institution: | GE Ning1,WANG Yun-lai2,CHEN Fu-ci1,ZHANG Ji-qing1 (1.Department of Radiotherapy,Wuhan General Hospital of Guangzhou Command,Wuhan Hubei 430070,China,2.Department of Radiotherapy,PLA General Hospital,Beijing 100853,China) |
| |
| Abstract: | objective:To investigate the influence of metal C-arm on absorbed doses for Precise accelerator.Methods:Solid water phantom was placed in the centre of tennis racket panel and the distance from ion chamber to the panel were 5 cm and 10 cm respectively.The involved gantry angels were measured for different field sizes crossing the right C-arm which had 7 fixed positions.Transmission factors of the right-side C-arm were measured using 0.6 cm3 ion chamber for 6 MV and 15 MV X-ray with fixed gantry angle and ro... |
| |
| Keywords: | radiotherapy C-arm absorbed dose gantry angle |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
