I. Introduction
In clinical practice, the corresponding points among medical images of various modalities, different times, different patients or different dimensions usually need to be consistently matched. Image registration technology is able to achieve this process, and transform the spatial mapping between different images. Medical image registration technology is widely used in disease diagnosis, map analysis, image guidance, formulation of surgical plan, internal organ movement modeling, and other fields. In recent years, image registration technology has played an important role in the analysis of medical images, image registration technology has become a prerequisite for the successful completion of various medical tasks. The exploration of medical registration algorithms has important research value and clinical significance.