CT机时间分辨力的体模测试方法  

Measurement of CT temporal resolution with a phantom

作　　者：戚永娟[1] 余晓锷[1] 王甜甜[1] 简峻[1] 

机构地区：[1]南方医科大学生物医学工程学院,广东广州510515

出　　处：《中国医学影像技术》2011年第11期2322-2325,共4页Chinese Journal of Medical Imaging Technology

基　　金：广州市科技支撑计划项目(2009Z1-E341)

摘　　要：目的设计用于测量CT机时间分辨力的方法和相应体模。方法根据环形伪影产生原理,使含有高密度衰减物的自制时间分辨力均匀体模与CT机架以同样的速度旋转,产生环形伪影,根据环形伪影的角度测量CT机的时间分辨力。结果当CT机架以0.5s/240°的扫描速度采集数据时,用自制体模测得CT机的时间分辨力为(0.5002±0.0014)s。结论实验设计的方法和自制体模可用于测量CT机的时间分辨力。Objective To design a method and the corresponding phantom for testing CT temporal resolution. Methods Based on the principle of ring artifact creation, an uniform self-prepared experimental temporal resolution phantom containing high attenuating materials was rotated at the same speed as the gantry to produce partial ring artifacts, then the temporal resolution was calculated according to the angle of partial ring artifacts. Results When the velocity of the X-ray tube was 0.5 s/240°, the temporal resolution of CT was （0. 5002±0. 0014）s. Conclusion It is feasible to measure the temporal resolution of CT using the practical method and selgprepared experimental phantom.

关 键 词：体层摄影术 X线计算机 时间分辨力 体模 伪影 圆弧角度 

分 类 号：R814.42[医药卫生—影像医学与核医学]