基于JJG(闽)1086-2018放射治疗CT模拟定位机X射线辐射源的质控分析

doi:10.3969/j.issn.1000-1158.2020.06.18

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摘要整个精确放疗流程最关键、最基础的一个环节就是定位CT扫描精确程度,做好定位CT的质控关乎整个放疗流程的成败。介绍了JJG(闽)1086-2018放射治疗CT模拟定位机X射线辐射源在检定和质控中的流程和方法,从剂量性能要求、图像成像质量和机器机械精度方面对CT模拟定位机的质量控制做了定量的要求。连续8个月的测试结果表明:CT测量值误差在30HU以内,图像均匀性≤5.0HU,空间分辨力7Lp/cm,低对比度分辨力在对比度为1.0%,0.5%,0.3%时分别≤3.0mm,≤5.0mm,≤6.0mm,达到了规程的要求。CT模拟定位机的图像质量和机械精确程度得到了很好的保障,定位CT的剂量准确,影像参数和位置精确度有规可循。

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	高翔
	石丽婉
	傅丽蓉
	陈思佳
	刘俊
	何逸鹏
	陈思嘉

关键词 ：计量学, CT模拟定位机, 放射治疗, X射线辐射源

Abstract：The accuracy of the beam ray and the target area together with the accuracy of the patients positioning are more and more important in the emphasis on the accurate radiotherapy. One of the most important aspects is the scanning accuracy of CT and the quality of the images, so the quality control of positioning CT is related to the success of the whole radiotherapy process. The principles and methods of the X-ray radiation source of JJG (Min)1086-2018 X-ray radiation source in the verification and quality control were introduced in detail, and the quality control of the CT simulation machine was quantitatively analyzed from the aspects of the image quality and the machines mechanical precision. The measurement error of CT is less than 30HU, the image uniformity is less than 5.0HU, the resolution is 7Lp/cm, and the low contrast resolution is less than 3.0mm, 5.0mm and 6.0mm at 1.0%, 0.5% and 0.3% respectively, which meets the requirements of the regulations. The image quality and mechanical accuracy of CT simulator are well guaranteed. The dose accuracy, image parameters and position accuracy of CT simulator can be followed regularly.

Key words： metrology CT simulator radiation therapy X-ray radiation source

收稿日期: 2019-05-13 发布日期: 2020-06-08

PACS:

TB98

通讯作者: 石丽婉(1973-),女,福建漳州人,高级物理师, 从事肿瘤放射治疗及质量控制研究。Email: shiliwan34@hotmail.com E-mail: shiliwan34@hotmail.com

作者简介: 高翔(1987-),男,山东潍坊人,硕士,物理师, 从事肿瘤放射治疗及质量控制研究。Email: 405847731@qq.com

引用本文:

高翔,石丽婉,傅丽蓉,陈思佳,刘俊,何逸鹏,陈思嘉. 基于JJG(闽)1086-2018放射治疗CT模拟定位机X射线辐射源的质控分析[J]. 计量学报, 2020, 41(6): 743-747.
GAO Xiang,SHI Li-wan,FU Li-rong,CHEN Si-jia,LIU Jun,HE Yi-peng,CHEN Si-jia. Study on the Quality Control for Computed-tomography Simulators Based on JJG1086-2018. Acta Metrologica Sinica, 2020, 41(6): 743-747.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2020.06.18 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2020/V41/I6/743

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