1. A method for segmenting a cardiac image, comprising the steps of: receiving a cardiac image; determining boundary information for one or more contours in the cardiac image using a gradient vector flow boundary method; determining region information to separate regions in the cardiac image according to their global intensity parameters; and applying a propagation model that combines the boundary and region information to propagate each contour to a target boundary in the cardiac image while applying an anatomical constraint to couple the propagation of the contours according to their relative distance.