Implicit Feature-Based Alignment System for Radiotherapy. - Ryoichi Yamakoshi; Kousuke Hirasawa; Haruhisa Okuda; Hiroshi Kage; Kazuhiko Sumi; Hidenobu Sakamoto; Yuri Ivanov; Toshihiro Yanou; Daisaku Suga; Masao Murakami (ICPR, 2010)