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.
出处
《中国医学影像技术》
CSCD
北大核心
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)
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
Tomography, X ray computed
Temporal resolution
Phantom
Artifacts
Angle of circular arc
