Abstract
The authors compare the accuracy and reproducibility of two systems for measuring three-dimensional motions of the human heart from biplane videoradiograms of surgically inserted radiopaque markers. System 1 uses orthogonal imaging systems with coincident perpendicular central rays and a modified parallel-ray approximation. System 2 uses a mathematical determination of the geometry of the imaging systems each time a sequence is recorded. Accuracy of the calculated lengths, expressed as mean percentage error of a series of known lengths, is >
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