Multi-modal medical image registration method based on image block similarity matching

The invention provides a multimodal medical image registration method based on image block similarity matching. The multimodal medical image registration method comprises the following steps: acquiring an ultrasonic and CT/MRI sequence image of a certain organ tissue of a patient; performing preprocessing on the CT/MRI data; screening and preprocessing the ultrasonic image to obtain an effective segmentation region of an organ in the ultrasonic image; and S3, carrying out block similarity matching calculation on the effective segmented regions of the ultrasonic image obtained in the step S3 and the preprocessed CT/MRI sequence image obtained in the step S2, and matching an optimal corresponding slice in the CT/MRI sequence for any ultrasonic image. According to the method, single or multiple ultrasonic images are screened and preprocessed, so that interference can be removed for similarity matching calculation to the maximum extent; through the optimized matching method, the optimal matching parameters can be