An Image Warping Method for Temporal Subtraction Images Employing Smoothing of Shift Vectors on MDCT Images. - Itai, Yoshinori; Kim, Hyoungseop; Ishikawa, Seiji; Katsuragawa, Shigehiko; Ishida, Takayuki; Kawashita, Ikuo; Awai, Kazuo; Doi, Kunio (2007)