Technical note: further development of a resolution modification routine for the simulation of the modulation transfer function of digital x-ray detectors.
Technical note: further development of a resolution modification routine for the simulation of the modulation transfer function of digital x-ray detectors.
复制标题
技术说明：进一步开发用于模拟数字 X 射线探测器调制传递函数的分辨率修改例程。
DOI：
10.1118/1.3644845
复制
发表时间：
2011
期刊：
影响因子：
3.8
通讯作者：
R. Speller
中科院分区：
文献类型：
--
作者：
A. Konstantinidis;A. Olivo;R. Speller
目的
本文提出了一个分辨率修改例程，它是用来模拟数字X射线探测器的前置调制传递函数（pMTF）的进一步发展。
方法
提出了一种从实验测量的水平和垂直一维pMTF重构各向异性二维（2D）pMTF矩阵的方法。在本研究中，探测器的水平尺寸为17.3 cm，而垂直尺寸为24 cm。该矩阵与超采样理想输入图像的2D傅立叶变换相乘以模拟模糊。然后，对恢复的图像进行采样以形成数字图像的像素。作者建议用梳状函数代替矩形函数进行卷积，以避免后者所需的sinc函数的校正。它表明，这种校正是避免梳函数时，使用。此外，本研究提出了一种方法，以有效地采样图像的情况下，当“模拟”间距的超采样输入图像和数字X射线探测器的像素间距之间的比率是一个半整数。
结果
仿真算法的验证表明，当使用梳状函数时，从输出图像和输入图像测量的pMTF之间的平均绝对差小于1%，而当使用矩形函数时，这是13%。当在后一种情况下应用sinc校正时，差异再次减小到小于1%。
结论
开发的修改例程提供了在更广泛的条件下模拟数字X射线探测器的空间分辨率的方法。
PURPOSE
This paper proposes the further development of a resolution modification routine which is used to simulate the presampling modulation transfer function (pMTF) of digital x-ray detectors.
METHODS
It suggests a method to reconstruct anisotropic two dimensional (2D) pMTF matrices from the experimentally measured horizontal and vertical 1D pMTFs. In this study, the horizontal dimension of the detector is 17.3 cm, while the vertical one is 24 cm. This matrix is multiplied with the 2D Fourier transform of the super-sampled ideal input image to simulate blurring. Then, the restored image is sampled to form the pixels of the digital image. The authors suggest convolution with the comb function instead of the rectangular function to avoid the correction with the sinc function required by the latter. It is demonstrated that this correction is avoided when the comb function is used. Moreover, this study suggests a way to effectively sample the images in the case when the ratio between the "analog" pitch of the super-sampled input image and the pixel pitch of the digital x-ray detector is a semi-integer.
RESULTS
The validation of the simulation algorithm demonstrated that when the comb function was used the average absolute difference between the pMTF measured from the output images and the input ones was less than 1%, while this was of 13% when the rectangular function was used. When a sinc correction was applied in the latter case the difference decreased again to less than 1%.
CONCLUSIONS
The developed modification routine provides the means to simulate the spatial resolution of digital x-ray detectors under a wider range of conditions.
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;Metz,CE
通讯作者：
Metz,CE
影响因子：
3.8
作者：
DOBBINS, JT
通讯作者：
DOBBINS, JT
用于优化乳腺断层合成系统的计算机模拟平台。
影响因子：
3.8
作者：
Zhou,Jun;Zhao,Bo;Zhao,Wei
通讯作者：
Zhao,Wei