Design and Implementation of Gradient Vector Flow Snake to Detect a Reference Object in Pelvic X-Rays for Preoperative Total Hip Arthroplasty Planning Application. - W. Kristanto; Peter M. A. van Ooijen; Bertram The; H. Duifhuis; Tati Rajab Mengko; Matthijs Oudkerk (J. Digit. Imaging, 2007)