Cohen G, DiBianca F A
J Comput Assist Tomogr. 1979 Apr;3(2):189-95. doi: 10.1097/00004728-197904000-00008.
Limiting-perception measurements of hole patterns in computed tomography reconstructions of a low-contrast phantom are used to generate contrast -- detail -- dose diagrams for various contrasts, hole diameters, dose, and system modulation transfer functions (MTF). These curves are then divided into MTF-dominated, transition, and noise-dominated regions. The low-contrast perceptibility and image noise are parameterized and compared. A limiting-perception factor is difined and is shown to be nearly independent of contrast, hole diameter, dose, and MTF in the noise-dominated region.
在低对比度体模的计算机断层扫描重建中，利用对孔型的极限感知测量来生成不同对比度、孔径、剂量和系统调制传递函数（MTF）的对比度-细节-剂量图。然后将这些曲线分为MTF主导区、过渡区和噪声主导区。对低对比度可感知性和图像噪声进行参数化并进行比较。定义了一个极限感知因子，结果表明在噪声主导区，该因子几乎与对比度、孔径、剂量和MTF无关。
