[1]洪君,单鹄声,周玉凤. 全身集成定位架对放疗靶区吸收剂量的影响[J].中国医学物理学杂志,2018,35(7):785-789.[doi:DOI:10.3969/j.issn.1005-202X.2018.07.009]
　HONG Jun,SHAN Husheng,ZHOU Yufeng. Effects of systemic integrated orientation frame on absorbed dose of target areas in radiotherapy [J].Chinese Journal of Medical Physics,2018,35(7):785-789.[doi:DOI:10.3969/j.issn.1005-202X.2018.07.009]
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 全身集成定位架对放疗靶区吸收剂量的影响()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
35卷
期数:
2018年第7期
页码:
785-789
栏目:
医学放射物理
出版日期:
2018-07-20

文章信息/Info

Title:
 Effects of systemic integrated orientation frame on absorbed dose of target areas in radiotherapy
文章编号:
1005-202X（2018）07-0785-05
作者:
 洪君; 单鹄声; 周玉凤
 解放军第82医院放疗科， 江苏 淮安 223001
Author(s):
 HONG Jun;  SHAN Husheng;  ZHOU Yufeng
 Department of Radiotherapy, the 82nd Hospital of the PLA, Huai’an 223001, China
关键词:
 ; 集成定位架; 放射治疗; 衰减率; 吸收剂量
Keywords:
 ; Keywords: integrated orientation frame;  radiotherapy;  attenuation rate;  absorbed dose
分类号:
R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2018.07.009
文献标志码:
A
摘要:
 目的：研究YC-TQ-Ⅱ型全身集成定位架对放疗靶区吸收剂量的影响。 方法：将尺寸为30 cm×30 cm×15 cm的固体水模体固定在全身集成定位架体部中心轴上进行CT扫描后，将CT图像导入XiO TPS并勾画出固体水模体、靶区及全身集成定位架结构，之后以电离室为中心，机架角度从0°开始每隔一定角度添加一个10 cm×10 cm、100 MU不同能量射线的照射野。考虑到高密度材料的大小对机架角度的影响，在以下机架角度范围内每隔1°测一个值（61°~79°、101°~119°、241°~259°、281°~299°）；在其他机架角度范围内每隔10°测一个值（0°~60°、80°~100°、120°~240°、260°~280°、300°~350°）。根据对称性计算出高能X射线穿过全身集成定位架的衰减率，随后在医用直线加速器上用UNDOSE剂量仪进行同等条件下的测量来验证XiO TPS计算的准确性，最后在XiO TPS上对比有无全身集成定位架的三维适形放疗计划靶区吸收剂量变化情况。 结果：全身集成定位架对高能X射线的最大衰减率为：13.0%（6 MV）、11.4%（15 MV），并且XiO TPS计算值与实际测量值符合得很好，最大偏差0.6%（15 MV）；添加全身集成定位架后靶区的D95%由6 000 cGy变化为5 304 cGy（6 MV）、5 484 cGy（15 MV）；放疗计划靶区的均匀性指数分别由0.091（6 MV）、0.104（15 MV）变化为0.195（6 MV）、0.175（15 MV）；靠近体架端靶区的6 000 cGy、5 500 cGy等剂量线明显上移，且6 MV比15 MV严重。 结论：YC-TQ-Ⅱ型全身集成定位架中的高密度材料可显著降低放疗靶区的吸收剂量，需要考虑其对高能X射线的衰减率并加以修正。
Abstract:
 Abstract: Objective To discuss the effects of YC-TQ-Ⅱ systemic integrated orientation frame on the absorbed dose of target areas in radiotherapy. Methods A solid water phantom of 30 cm×30 cm×15 cm was fixed on the body center axis of systemic integrated orientation frame for CT scanning. Then the obtained CT images were imported into XiO TPS, and the solid water phantom, target areas and the structure of systemic integrated orientation frame were sketched. A 10 cm×10 cm and 100 MU radiation field with different energies at the center of ionization chamber was added at regular angels, which starting at 0°. Considering the effects of the size of high-density material on the angle, a value was measured at every 1° in the following angle ranges, namely 61°-79°, 101°-119°, 241°-259°, 281°-299°, and a value was measured at every 10° in other angle ranges (0°-60°, 80°-100°, 120°-240°, 260°-280°, 300°-350°). According to symmetry, the attenuation rate was calculated when high-energy X-ray went through systemic integrated orientation frame. Then the accuracy of XiO TPS was verified by the measurement of UNDOSE dosimeter under the same conditions on medical linear accelerator. Finally, the changes of absorbed dose in three-dimensional conformal radiotherapy were analyzed on XiO TPS with or without systemic integrated orientation frame. Results The maximum attenuation rate of high-energy X-ray caused by systemic integrated orientation frame were 13.0% (6 MV), 11.4% (15 MV), and the calculated output of XiO TPS was in good agreement with measured value, with a maximum deviation of 0.6% (15 MV). After adding systemic integrated orientation frame, the D95% of target areas decreased from 6 000 cGy to 5 304 cGy (6 MV), 5 484 cGy (15 MV). The homogeneity index of target areas increased from 0.091 (6 MV), 0.104 (15 MV) to 0.195 (6 MV), 0.175 (15 MV). The isodoses lined of 6 000, 5 500 cGy of target areas closing to body frame were shifted up obviously, and the shift of 6 MV was more obviously than that of 15 MV. Conclusion The high-density material of YC-TQ-Ⅱ systemic integrated orientation frame can significantly lower the absorbed dose of target areas in radiotherapy, and the attenuation rate of high-energy X-ray caused by the material must be considered and corrected.

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备注/Memo

备注/Memo:
 【收稿日期】2018-01-17
【作者简介】洪君，硕士，助理研究员，研究方向：医学物理，E-mail: 455190466@qq.com
【通信作者】单鹄声，硕士，主治医师，研究方向：肿瘤放射治疗，E-mail: 195555886@qq.com
更新日期/Last Update: 2018-07-24