[1]许刘杨,王晓银,王守宇,等.瓦里安直线加速器机器性能检查中MV影像中心偏移量影响因素分析[J].中国医学物理学杂志,2024,41(7):808-812.[doi:DOI:10.3969/j.issn.1005-202X.2024.07.004]
 XU Liuyang,WANG Xiaoyin,WANG Shouyu,et al.Factors affecting MV imager projection offset in machine performance check for Varian linear accelerator[J].Chinese Journal of Medical Physics,2024,41(7):808-812.[doi:DOI:10.3969/j.issn.1005-202X.2024.07.004]
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瓦里安直线加速器机器性能检查中MV影像中心偏移量影响因素分析()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
41卷
期数:
2024年第7期
页码:
808-812
栏目:
医学放射物理
出版日期:
2024-07-25

文章信息/Info

Title:
Factors affecting MV imager projection offset in machine performance check for Varian linear accelerator
文章编号:
1005-202X(2024)07-0808-05
作者:
许刘杨1王晓银2王守宇1庞克华1孙丹丹1杨军1
1.新乡医学院第一附属医院放射治疗技术科, 河南 卫辉 453100; 2.新乡医学院第一附属医院河南省神经修复重点实验室, 河南 卫辉 453100
Author(s):
XU Liuyang1 WANG Xiaoyin2 WANG Shouyu1 PANG Kehua1 SUN Dandan1 YANG Jun1
1. Radiotherapy Technology Department, the First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China 2. Henan Key Laboratory of Neurorestoratology, the First Affiliated Hospital of Xinxiang Medical University, Weihui 453100, China
关键词:
直线加速器机器性能检测机载影像系统编码器等中心校正
Keywords:
Keywords: linear accelerator machine performance check on-board imager encoder isocenter calibration
分类号:
R815.6
DOI:
DOI:10.3969/j.issn.1005-202X.2024.07.004
文献标志码:
A
摘要:
【摘要】目的:探究导致瓦里安Vital beam直线加速器机器性能检查(MPC)结果中MV影像中心偏移量异常的主要因素。方法:通过修复MV影像臂“肩部”电机编码器、锁定治疗床位置以及等中心校正方法观察MPC结果中MV影像中心偏移量数值并进行统计学分析。结果:修复MV影像臂编码器后,MPC结果中MV影像中心偏移量小于空白组且差异具有统计学意义[空白组:(0.450±0.010) mm vs 维修编码器组:(0.310±0.001) mm]。等中心校正组MV影像中心偏移量与空白组相比差异无统计学意义。锁定治疗床组MV影像中心偏移量小于空白组且差异具有统计学意义[空白组:(0.450±0.010) mm vs 锁定治疗床组:(0.240±0.030) mm]。维修影像臂编码器并做等中心校正之后进行MPC时锁定治疗床与不锁定治疗床的MV影像中心偏移量结果无统计学差异。结论:MV影像臂“肩部”电机编码器损伤是导致MV影像中心偏移量异常的主要因素,开始MV影像中心检查前锁定治疗床位置能降低当次检查结果,但是无法彻底解决MV影像中心偏移的问题。
Abstract:
Abstract: Objective To explore the main factors affecting the MV imager projection offset in the machine performance check (MPC) for Varian Vital Beam linear accelerator. Methods The MV imager projection offsets in the MPC after repairing the MV imaging arm encoder of shoulder motor, locking the treatment couch, and isocenter calibration were analyzed. Results MPC results revealed that the MV imager projection offset after repairing the MV imaging arm encoder of shoulder motor was (0.310±0.001) mm, significantly less than (0.450±0.010) mm in the blank group. The difference in MV imager projection offset between the isocenter calibration group and the blank group was trivial. The MV imager projection offset after locking the treatment couch was (0.240±0.030) mm, significantly less than (0.450±0.010) mm in the blank group. When MPC was carried out after repairing the imaging arm encoder and performing isocenter calibration, there was no significant statistical difference in MV imager center offset between the locked and unlocked treatment couch. Conclusion The damage of MV imaging arm encoder of shoulder motor is the main factor causing abnormal MV imager projection offsets. Locking the treatment couch before the MV imaging center check can reduce the results, but it cannot eliminate the MV imager projection offset.

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备注/Memo

备注/Memo:
【收稿日期】2023-12-23 【基金项目】河南省医学科技攻关计划联合共建项目(LHGJ20220622) 【作者简介】许刘杨,放疗物理师,研究方向:肿瘤放射治疗,E-mail: 13283739261@163.com 【通信作者】杨军,副主任医师,研究方向:肿瘤放射治疗,E-mail: 2453381967@qq.com
更新日期/Last Update: 2024-07-12