摘要
目的通过测量CT系统调制传递函数客观有效地反映CT系统空间分辨能力。方法扫描CT测试体模中点源模块,获得系统的点扩散函数和线扩散函数,对其进行傅立叶变换并对计算结果进行校正。结果利用自行开发的处理程序绘出CT系统的调制传递函数(MTF)曲线并给出50%,10%,2%MTF值。结论通过计算CT系统的MTF可以全面而客观地反映系统对于细节的识别能力。
Objective To evaluate the high resolution of CT system by measuring the modulation transfer function （MTF） of CT system. Methods The point source module in CT test phantom was scaned, the point spread function（PSF） and line spread function（LSF） of CT system were obtained, then Fourier transform was performed and the result was calibrated . Results Using the processing program developed in our work, the MTF curve was plotted and the 5096,10% ,2% MTF values were given. Conclusion The measurement of modulation transfer function is a effective and objective method to reflect the true ability of CT system to distinguish objects.
出处
《医疗设备信息》
2006年第5期11-13,20,共4页
Information of Medical Equipment
