Fig. 8

The process of image segmentation. a Reconstructed image obtained 17.2 keV. b Reconstructed image at 16.5 keV. c The subtracted slice from (a) and (b). d Subtracted slice with an image registion fucntion. e Colors lable the intensity of pixel value of (d). f–i Image segmentation based on the threshold of (a, b). Detailed data of images (f–i) is listed in Table 2