A controller for displaying the puncture site of the atrial septum for cardiac repair includes memory and processor 710.Processor 710 performs instruction 784 to perform the process based on the image data of the heart including mitral valve and atrial septum.The process includes regulating the mitral annulus plane along the mitral annulus of the mitral valve and normal vectors perpendicular to the mitral annulus plane.The process also includes defining an offset plane that crosses the atrial septum and is parallel to the mitral annulus plane.A safety zone for the puncture site is identified and displayed on the atrial septum.The safety zone is between the lower boundary plane 456 and the upper boundary plane 455, each of which is parallel to the offset plane with a designated distance.
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