论文部分内容阅读
目的 建立CT机影像质量保证检测范围及标准。方法 采用美国RMI461A及463检测体模、美国MDH1015C剂量仪及10X5103CT电离室探头、瑞典UNF9004kVp表等检测设备,针对高对比分辨率等12项性能参数,检测了不同厂家、不同时期生产的104台CT机,包括早期二代CT及新安装的螺旋CT;搜集了13份相关国际和国外标准、学会标准及有关规定,以及国内外87种型号CT机的产品说明书及其他性能参数等资料;在同一台CT机(SiemensHQS)上,对比了RMI、Victoreen、Catphan等3种不同CT检测体模的检测结果;广泛征求有关专家和厂家的意见。结果 根据CT检测结果,借鉴国外相关标准,参考国内有关规定,决定将高对比分辨率、低对比分辨率、噪声、均匀性、CT值、CT剂量指数、层厚、定位光、诊断床定位精度及扫描架倾角等列为检测项目,规定了CT验收检测、状态检测和稳定性检测的具体检测项目及指标,其中稳定性检测项目、指标与国际电工委员会(IEC)的国际标准相同,状态检测指标低于验收检测,低对比分辨率、均匀性、诊断床定位精度、定位光精度的验收检测指标作了比国外更为严格的规定。结论 该规范适合国情,与国际标准接轨,具有科学性和可行性,有利于CT机影像质量保证工作的进行。
Objective To establish the scope and standard of CT image quality assurance testing. Methods A total of 12 CTs produced by different manufacturers and different periods were tested for 12 performance parameters including RMI461A and 463 test phantoms, MDH1015C dosimeters and 10X5103CT ionization chamber probes from the United States, and UNF9004 kVp table from Sweden. Machine, including the early second-generation CT and newly installed spiral CT; collected 13 relevant international and foreign standards, the Institute standards and related regulations, as well as 87 kinds of models at home and abroad CT machine product manuals and other performance parameters and other information; in the same Taiwan CT machine (SiemensHQS), compared RMI, Victoreen, Catphan and other three kinds of CT test phantom test results; extensive solicit the opinions of experts and manufacturers. Results According to the results of CT examination, referring to the relevant foreign standards, referring to the relevant domestic regulations, it was decided to combine the high contrast resolution, low contrast resolution, noise, uniformity, CT value, CT dose index, And gantry angle as the test items, the provisions of the CT acceptance testing, status testing and stability testing of specific testing items and indicators, including stability testing items, indicators and International Electrotechnical Commission (IEC) the same international standards, state detection Indicators lower than the acceptance test, low contrast resolution, uniformity, diagnostic bed positioning accuracy, positioning accuracy of inspection and acceptance index made more stringent than the provisions of foreign countries. Conclusion The standard is suitable for the national conditions, with international standards, scientific and feasible, is conducive to CT image quality assurance work.