Abstract
An analysis of heart wall motion requires that specific points on the wall be identified and their movements tracked in three dimensions over several heart beats. A method to reconstruct time-dependent 3D coordinates from any two or more perspective views has been developed. We have used this method to determine accurately the 3D dynamics of bifurcation points of the coronary arteries or surgically implanted markers by tracking their projections in both views of a biplane coronary cineangiogram. The tracking operation is aided by a sophisticated interactive computer system which superimposes an animated graphics display onto the film image. This allows entries to be checked and corrected immediately. The most powerful tool provided by the graphics system is the ability to display the backprojections of positions from one view as auxiliary lines across the other view on which the projection of the point of interest must lie. We provide some examples of cardiac wall motion measures we have made using this system.
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