document: Reconstruction of time-varying 3-D left-ventricular shape from multiview X-ray cineangiocardiograms This paper reports on the clinical application of a system for recovering the time-varying three-dimensional -LRB- 3-D -RRB- left-ventricular -LRB- LV -RRB- 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 -LRB- using supplementary angiography -RRB- 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
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