Method of medical image registration

A method of medical image registration, the method to be implemented by a computer device and comprising:

• (A) obtaining an ultrasound target image from an ultrasound image of one of multiple portions of a bone of a subject, the ultrasound target image corresponding to an area of interest in the ultrasound image;
• (B) for each of multiple computed tomography, CT, images of respective portions of the bone of the subject, obtaining a CT candidate image that corresponds to an area of interest in the CT image;
• (C) for each of the CT candidate images obtained for the CT images, calculating a similarity between the CT candidate image and the ultrasound target image;
• (D) making one of the CT candidate images that corresponds to the greatest similarity among the CT candidate images serve as a CT target image;
• and
• (E) performing image registration on the ultrasound target image and the CT target image.