Method for obtaining volume of interest of four-dimensional heart image

The invention relates to a method for obtaining the volume of interest of a four-dimensional heart image, which belongs to the technical field of image processing. The method comprises the following steps that volume data of a tissue structure is read, voxelization treatment is performed, and regional projection is selected to an interactive polygon through a set of triangular patches, so as to obtain myocardial four-dimensional visualization data based on the volume data; then precise extraction and grid expansion are performed on a selected region in a gridding projection surface, so as to obtain all surface elements involved in a region of interest; and finally, octree encoding and consistency extraction are performed to obtain a voxel set of any sequential image, thereby realizing four-dimensional visualization data of a cardiovascular system on the basis of the volume data. By using the method, a local tissue volume data set corresponding to a contour of the extracted heart region of interest can be automatically obtained, and finally, local extraction and visualization of the four-dimensional heart image are realized. Because the space occupied by the extracted local volume data set is obviously less than the space occupied by the integral volume data set, compared with the space occupied by an image stack before extraction, the space occupied by the extracted image stack is greatly reduced, and therefore, the time consumed by four-dimensional visualization is greatly reduced.