Receiving a plurality of images of a first wall of the patient's heart, the plurality including a first image captured at a time ij and a second image captured at a time t2, determining based on the plurality of images, a first characteristic of movement of at least a wall portion of the first wall during a time period spanning time t1 and time t2, the first characteristic of movement being determined by using one or more image processing techniques, and the first, characteristic of movement being based on at least one of: (i) a shape of the wall portion in the first image and a shape of the wall portion in the second image, and (ii) a location of the wall portion in the first image and a location of the wall portion in the second image: and outputting an indication of the first characteristic of movement.
