Abstract
Orthogonal diameters of roentgen silhouettes of a test object (balloon) were measured automatically on each of about 80 video lines comprising its biplane images recorded 60 times/sec along with intraballoon pressure, P( t), during its distention with a roentgendense liquid at a known rate and volume. The balloon's surface was calculated from these data plus regional volumes, V( L,), circumferences, C( L, t), stresses, P( t) × C( L, t), and strains, ΔL L , and their derivatives. Spatial surfaces of the balloon with superposed isovalue lines and continuous surface displays of the interrelationships of these functions were generated. These multidimensional data-dense images can be photographed or recorded on a video disk for dynamic analysis during forward or reverse variable time-base and stop-action replays. Sequential 60/sec images derived from angiograms of the left ventricle with superposed isoparameter lines along with other hemodynamic variables illustrate the capability of detailed operator-computer interactive analysis of the spatial and temporal interrelationships of the various determinants of cardiac function.
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