Comparison of CNRs for unfiltered and filtered tomographic slices of a metastasis of a low-grade adenocarcinoma in a steatotic liver shown in Figure 2.

For the calculation of the CNRs the areas I (red, surrounding formalin) and II (blue, high-contrast tumor) marked in Figure 2B were used, which correspond to 30×30 pixels.为计算对比度噪声比（CNRs），本研究采用图2B中标注的区域I（红色，环绕福尔马林区域）与区域II（蓝色，高对比度肿瘤区域），该两个区域的尺寸均为30×30像素。