Measurement of the presampled two-dimensional modulation transfer function of digital imaging systems.
Measurement of the presampled two-dimensional modulation transfer function of digital imaging systems.
复制标题
数字成像系统预采样二维调制传递函数的测量。
DOI：
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
E. Ritenour
中科院分区：
文献类型：
--
作者：
K. Fetterly;N. Hangiandreou;B. Schueler;E. Ritenour
本研究的目的是开发一种测量数字成像系统的预采样二维调制传递函数（2D MTF）的方法。通过在0.5 mm厚的铜板上加工256个直径为0.107 mm的孔，创建自定义X射线"点源"体模。对体模进行多次成像，得到许多单个X射线斑点的图像。"每个点的中心（相对于像素矩阵）通过将每个点拟合到2D高斯函数来确定子像素精度。子像素光点中心位置用于创建5倍过采样系统点扩散函数（PSF），该函数表征系统的光学和电学特性，并且独立于原始图像的像素采样。计算了点扩散函数的傅里叶变换模。接下来，将傅立叶函数归一化为零频率值。最后，傅里叶变换函数除以定义孔的频率含量的一阶贝塞尔函数，得到预采样的2D MTF。测量了使用碘化铯闪烁体的0.1 mm像素间距计算机射线照相系统和0.2 mm像素间距平板数字成像系统的预采样2D MTF。使用边缘设备方法获得的二维MTF的轴向分量的一维MTF测量结果的比较表明，这两种方法产生一致的结果。
The purpose of this work was to develop methods to measure the presampled two-dimensional modulation transfer function (2D MTF) of digital imaging systems. A custom x-ray "point source" phantom was created by machining 256 holes with diameter 0.107 mm through a 0.5-mm-thick copper plate. The phantom was imaged several times, resulting in many images of individual x-ray "spots." The center of each spot (with respect to the pixel matrix) was determined to subpixel accuracy by fitting each spot to a 2D Gaussian function. The subpixel spot center locations were used to create a 5 x oversampled system point spread function (PSF), which characterizes the optical and electrical properties of the system and is independent of the pixel sampling of the original image. The modulus of the Fourier transform of the PSF was calculated. Next, the Fourier function was normalized to the zero frequency value. Finally, the Fourier transform function was divided by the first-order Bessel function that defined the frequency content of the holes, resulting in the presampled 2D MTF. The presampled 2D MTF of a 0.1 mm pixel pitch computed radiography system and 0.2 mm pixel pitch flat panel digital imaging system that utilized a cesium iodide scintillator was measured. Comparison of the axial components of the 2D MTF to one-dimensional MTF measurements acquired using an edge device method demonstrated that the two methods produced consistent results.
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
影响因子：
3.8
作者：
DOBBINS, JT;ERGUN, DL;CLARK, DC
通讯作者：
CLARK, DC
柯达计算机放射成像系统的性能特征。
影响因子：
3.8
作者：
Bradford,CD;Peppler,WW;Dobbins3rd,JT
通讯作者：
Dobbins3rd,JT