A fast and stable method for detecting and tracking medical organs in MRI sequences

A discrete dynamic model for defining contours in 2-D medical images is pre sented. An active contour in this objective is optimised by a dynamic progr amming algorithm, for which a new constraint that has fast and stable prope rties is introduced. The internal energy of the model depends on local beha vior of the contour, while the external energy is derived from image featur es. The algorithm is able to rapidly detect convex and concave objects even when the image quality is poor.