1. A processor-implemented method of quantifying dynamic movement of a mitral valve using 3 dimensional images of a mitral valve, comprising: a processor obtaining a series of N 3-dimensional images of the mitral valve over time; the processor registering each pair of consecutive 3-dimensional images using symmetric diffeomorphism to obtain information about how the mitral valve deforms over time; segmenting the mitral valve in the N 3-dimensional images using landmark points on the mitral valve in the N 3-dimensional images at predetermined time points in the cardiac cycle; the processor using the information about how the mitral valve deforms over time to fit a 3 dimensional medial model to the segmented mitral valve at each of the predetermined time points in the cardiac cycle; and outputting the medial representations of the mitral valve as a quantification of said dynamic movement of said mitral valve over time.