David S. Paik Christopher F. Beaulieu Geoffrey D. Rubin Burak Acar R. Brooke Jeffrey Jr. Judy Yee Joyoni Dey Sandy Napel Surface normal overlap: a computer-aided detection algorithm with application to colonic polyps and lung nodules in helical CT. 661-675 2004 23 IEEE Trans. Med. Imaging 6 http://dx.doi.org/10.1109/TMI.2004.826362 db/journals/tmi/tmi23.html#PaikBRAJYDN04