ABSTRACT
Surfaces of different anatomical structures appear as contours in MR images of the knee. In case of the knee the most important contours are that of the bone and the cartilage. These contours can be delineated manually by using the interactive facilities of the computer, or by an automatic process. Both approaches are based on the fact that different anatomical structures have different intensity values. Contour detection algorithms extract region boundaries as the lines where the intensity gradient is large.
