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.
ASJC Scopus subject areas
- Medicine (miscellaneous)