An image processing apparatus has a map data generating unit, a correction processing unit and a display processing unit. The map data generating unit generates 3D map data including voxel values based on blood signal values of a myocardium area of a heart included in volume data of the heart. The correction processing unit corrects a plurality of voxel values on each a plurality of straight lines radially extending from an interior side of the heart so as to be equivalent to a voxel value at an inner wall side of the myocardium area on each of the straight lines to generate 3D corrected map data on the basis of the 3D map data. The display processing unit generates image data on the basis of the 3D corrected map data to display on a display device.
