1. A Picture Archiving and Communications System (PACS) viewer comprising processing circuitry configured to: register an image onto a template; determine a representative seed point within each of left and right lungs as represented by the image; apply an active contour model to each of the left and right lungs to generate a binary image of the left and right lungs, wherein the processing circuitry is configured to apply the active contour model by initializing the active contour model with a mask constructed using the representative seed points; and detect at least one feature from the binary image to permit identification of the left and right lungs.