摘要
调制传输函数可对线性影像系统的频率传输特性进行描述。利用调制传输函数计算空间分辨率与线对卡方法相比 ,虽然测量方法复杂 ,但是利用调制传输函数对系统性能进行评价会更客观、更全面。利用编写的调制传输函数计算程序对CT和MRI的频率传输特性进行计算 ,并与线对卡检测结果进行了比较和讨论。
Method Modulation transfer function (MTF) was used to analyze the spatial frequency transfer characteristics of CT and MRI. MTF results were compared and discussed against the line pairs′ results.Results (1) CT (non spiral scan), the MTF results (10% contrast) were 6\^69 1p/cm, 7\^37 1p/cm, 9\^1 1p/cm according to 10mm, 5mm, and 2mm slice thickness respectively. The line pairs results were all 7 1p/cm. (2) CT (spiral scan), the MTF result was 5\^5 1p/cm and the line paris result was 5 1p/cm. (3) MRI, the MTF result was 5\^6 1p/cm and the line pairs result was 5 1p/cm.Conclusion Compared with the line pairs method, the MTF method is complicated, but it can describe the spatial frequency transfer characteristics in more detail and accuracy, and the MTF program is practically useful.
出处
《北京生物医学工程》
2002年第3期179-179,共1页
Beijing Biomedical Engineering
