1. An apparatus for generating a contour corresponding to a region of interest within an image, the apparatus comprising: a processor configured to (1) compute a plurality of scalar second derivative values for a first plurality of data points, the first plurality of data points being representative of a plurality of contours corresponding to the region of interest, each contour having a corresponding plane, (2) define a second plurality of data points as a function of the computed scalar second derivative values, the second plurality being less than the first plurality, and (3) generate a new contour in a new plane based on the second plurality of data points, the new contour corresponding to the region of interest.