Simple method for modulation transfer function determination of digital imaging detectors from edge images
Simple method for modulation transfer function determination of digital imaging detectors from edge images
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从边缘图像确定数字成像探测器的调制传递函数的简单方法
DOI：
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
U. Neitzel
中科院分区：
文献类型：
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作者：
E. Buhr;S. Günther;U. Neitzel
已经开发了一种用于确定数字成像探测器的预采样调制传递函数(MTF)的EDGE方法的简单变体，该方法只需少量的对准和计算工作即可为直到探测器奈奎斯特频率极限的频率产生足够精确的MTF值。通过重新排列对应于一个像素的边缘的横向移位的N个连续行的像素数据，从倾斜边缘的图像生成过采样边缘扩展函数(ESF)。原始数据用于计算分析，不需要进一步的数据前处理。由于导致一个像素的边缘移位的行数通常是分数而不是整数，因此在所获得的MTF中可能引入系统误差。模拟和理论研究表明，对于奈奎斯特极限以下的所有频率，MTF/MTF的相对误差小于1/(2N)，因此可以通过适当地选择N来保持在给定的阈值以下。该方法特别适用于在奈奎斯特频率极限以下需要Δ的应用，例如检测量子效率(DQE)的确定。
A simple variant of the edge method to determine the presampled modulation transfer function (MTF) of digital imaging detectors has been developed that produces sufficiently accurate MTF values for frequencies up to the Nyquist frequency limit of the detector with only a small amount of effort for alignment and computing. An oversampled edge spread function (ESF) is generated from the image of a slanted edge by rearranging the pixel data of N consecutive lines that correspond to a lateral shift of the edge of one pixel. The original data are used for the computational analysis without further data preprocessing. Since the number of lines leading to an edge shift of one pixel is generally a fractional number rather than an integer, a systematic error may be introduced in the MTF obtained. Simulations and theoretical investigations show that for all frequencies up to the Nyquist limit the relative error ΔMTF/MTF is below 1/(2N) and can thus be kept below a given threshold by a suitable choice of N. The method is especially useful for applications where the MTF is needed for frequencies up to the Nyquist frequency limit, like the determination of the detective quantum efficiency (DQE).
数字放射线摄影中基本成像特性的研究。
影响因子：
3.8
作者：
Kume,Y;Doi,K
通讯作者：
Doi,K
数字放射线摄影中基本成像特性的研究。
影响因子：
3.8
作者：
Giger,ML;Doi,K
通讯作者：
Doi,K