Geometric magnification, variable domain image magnification, macro image magnification and interpolation image magnification. The principle of geometric amplification technology is to shorten the distance between the detector array assembly of X-ray tube and the detected object properly, so that the signals generated by the smaller detected object under the irradiation of X-ray beam are collected by relatively more detectors, and the image quality and the detection effect of tiny lesions are improved. Variable-domain image amplification technology can only reconstruct and amplify the data of an outline image through variable-domain amplification, so that the whole image display matrix can display a smaller area image to the maximum, which solves the problem that the resolution is limited by the display matrix. And the center of the region of interest in the image is located in the center of the image display matrix. Macro image magnification: In hardware structure, the detector deviates from the scanning center 1/4 detector width. Therefore, after inserting additional software processing in the image reconstruction stage, an interlaced contour with double sampling information is obtained, which is equivalent to doubling the number of detectors. And the spatial resolution of the image is improved.