NASA Technical Report, Issues 461-462

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National Aeronautics and Space Administration, 1976 - Aerodynamics

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Page i - No. 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered 15.
Page 285 - The use of biplane angiocardiography for the measurement of left ventricular volume in man.
Page 285 - H, Dodge HT: The use of single plane angiocardiograms for the calculation of left ventricular volume in man.
Page i - Category 71 19. Security Qassif. (of this report) Unclassified 20. Security Classif. (of this page) 21. No. of Pages Unclassified 98 22.
Page 288 - A biplane roentgen videometry system for dynamic /60 per second/ studies of the shape and size of circulatory structures, particularly the left ventricle.
Page 285 - Usefulness and limitations of radiographic methods for determining left ventricular volume.
Page 19 - The approach to contour extraction described here formulates the contour extraction problem as one of minimum cost tree searching. Branch costs or metrics are defined which are indicative of the likelihood that a particular branch lies on the true contour. The branch metrics incorporate both local and global or contextual information. The most likely path or contour is then extracted by application of a heuristic tree searching algorithm.
Page 20 - ... of left-ventricular volume from serial angiocardiograms have neglected the explicit location of the aortic valve line and the ventricle apex. From heuristic considerations of typical aorta-ventricle outlines, an algorithm has been developed to find these key points. The algorithm tracks the turning of the aorta-ventricle outline and uses this information to find the apex and to nominate points for ends of the aortic valve line. The correct valve points maximize an objective function defined on...
Page 288 - STURM, RE AND WOOD, EH The video quantizer: an electronic photometer to measure contrast in roentgen fluoroscopic images.

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