title: Reconstruction of time-varying 3-D left-ventricular shape from multiview X-ray cineangiocardiograms.
abstract: This paper reports on the clinical application of a system for recovering the time-varying three-dimensional (3-D) left-ventricular (LV) shape from multiview X-ray cineangiocardiograms. Considering that X-ray cineangiocardiography is still commonly employed in clinical cardiology and computational costs for 3-D recovery and visualization are rapidly decreasing, it is meaningful to develop a clinically applicable system for 3-D LV shape recovery from X-ray cineangiocardiograms. The system is based on a previously reported closed-surface method of shape recovery from two-dimensional occluding contours with multiple views. To apply the method to "real" LV cineangiocardiograms, user-interactive systems were implemented for preprocessing, including detection of LV contours, calibration of the imaging geometry, and setting of the LV model coordinate system. The results for three real LV angiographic image sequences are presented, two with fixed multiple views (using supplementary angiography) and one with rotating views. 3-D reconstructions utilizing different numbers of views were compared and evaluated in terms of contours manually traced by an experienced radiologist. The performance of the preprocesses was also evaluated, and the effects of variations in user-specified parameters on the final 3-D reconstruction results were shown to be sufficiently small. These experimental results demonstrate the potential usefulness of combining multiple views for 3-D recovery from "real" LV cineangiocardiograms.
authors.affiliation: Faculty of Management and Information Science, Osaka International University, Hirakata, Japan.
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Moriyama
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Sato
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Naito
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hanayama
authors.forename: Takashi
authors.initials: T
authors.lastname: Ueguchi
authors.forename: Toshinobu
authors.initials: T
authors.lastname: Harada
authors.forename: Fujiichi
authors.initials: F
authors.lastname: Yoshimoto
authors.forename: Shinichi
authors.initials: S
authors.lastname: Tamura
mesh_terms: D000465:Algorithms; D002932:Cineangiography / Q000379:methods*; D006344:Heart Septal Defects, Atrial / Q000000981:diagnostic imaging*; D006352:Heart Ventricles / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity