Interactive manipulation of contour data using the layers program

The "layers" program is useful for visualizing and editing large sets of contour data. These datasets arise frequently when trying to extract geometry from MRI slices. Due to the imprecise nature of the MR imaging and segmentation processes, the contours extracted may not accurately reflect the human geometry. The "layers" program has been designed to allow the efficient editing of these contours in order to provide human control over the contour generation process.