CT机应用质量检测与临床照片图像质量关系  

Relationship between CT scanner quality testing and image quality

作　　者：杨克柽[1] 林意群[1] 冯晓刚[1] 余晓锷[1] 林木炎[1] 

机构地区：[1]第一军医大学生物医学工程系

出　　处：《放射学实践》2002年第3期249-251,共3页Radiologic Practice

基　　金：总后"十五"计划青年基金 (0 1Q0 72 )

摘　　要：目的 :分析CT设备应用质量检测结果与临床照片图像质量之间的关系 ,探讨检测方法的改进措施。方法 :采用Catphan 5 0 0体模和标准剂量组合头模 ,依照军队CT机应用质量检测与评审规范 ,对 118台CT设备实施检测 ;同时随机抽取近期人体各部位临床照片共七张 ,由专家组评审分级。以图像质量等级为关键字 ,对各参数进行归类统计。结果 :临床照片图像质量与剂量指数、噪声水平、密度分辨率和空间分辨率关系密切。结论 :实际检测中 ,要根据参数之间的相互关系合理安排先后顺序 :先测量层厚 ,并校准直至合格 ;然后进行照射剂量水平的控制 ;再继续其它参数的检测。Objective:To improve the testing methods by studying the relationship between CT sanner quality testing and image quality.Methods:118 CT scanners were tested by a set of Catphan 500 phantom and a set of standard dose meter. 7 random images associated with different parts of the whole body were evaluated and graded by clinical experts. Then, statistics of the testing results were made corresponding to image quality grade.Results:The qualities of clinical images were closely related to such parameters as CTDI, noise level, density resolution and spatial resolution. Conclusion:It is important in the QA testing to reasonablly arrange the order of parameters: slice thickness and its calibration first,followed by CTDI and other parameters.

关 键 词：CT机 体层摄影术 X线计算机 应用质量检测 剂量指数 临床照片 图像质量 

分 类 号：R814.3[医药卫生—影像医学与核医学]