期刊论文

Study of the MTF Measurement for X- Ray Detector using Slit Method

Gui, J.-B.

中文

核电子学与探测技术

0258-0934

2015

35

8

783-787

10.3969/j.issn.0258-0934.2015.08.009

国家科技支撑计划项目（2012BAI13B04）资助；

本校为第一机构

X射线探测器的调制传输函数（MTF）可以有效反映X射线摄影系统的成像质量,是客观评价X射线成像系统性能的一个重要方法。实验采用一个缝宽为10μm的狭缝相机和一个微焦斑X射线源,搭建测量平板探测器MTF曲线的平台。通过探测器采集X射线穿透狭缝的成像数据,运用MATLAB编程对狭缝图像进行线扩展函数（line spread function,LSF）的合成、高斯拟合、去噪、傅立叶变换和归一化等处理,得到探测器的MTF曲线,再利用MTF曲线定量分析探测器的成像性能。通过探测器采集不同的X射线源电压、发射功率、狭缝倾角及曝光时间下的数据,比较它们对探测器MTF测量结果的影响。

The modulation transfer function (MTF) of the X ray detector can reflect the imaging quality of the X ray radiography system. MTF is an important method for evaluating the quality of imaging systems. We established a platform for measuring the MTF of the flat detector using a 10 μm width slit camera and a micro focus X ray source. Using detector for collecting the imaging data of the X ray through the slit and processing the slit image data by MATLAB programming to obtain the MTF profile of the detector, the process contains compositing the li...