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

Study on the Quality Control for Computed-tomography Simulators Based on JJG1086-2018

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30 HU以内,图像均匀性≤5. 0 HU,空间分辨力7 Lp/cm,低对比度分辨力在对比度为1. 0%,0. 5%,0. 3%时分别≤3. 0 mm,≤5. 0 mm,≤6. 0 mm,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。

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 30 HU,the image uniformity is less than 5.0 HU,the resolution is 7 Lp/cm,and the low contrast resolution is less than 3.0 mm,5.0 mm and 6.0 mm 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.