Abstract
The time course of left ventricular volume is obtained through computer processing of videoangiographic data. The analysis is based on the theory of X-ray absorption, where the intensity of the single plane image yields the third dimension information. Consequently, a detailed boundary detection of the chamber walls is not required. A TV-computer interface is described which converts, in real time, the desired portion of the TV image. The videodensitometry approach requires uniform opacification, thus the clinical protocol entails upstream injections of dye. This procedure eliminates the undesirable reactions and transients associated with left ventricular injections of dye, and a greater number of heart cycles of data are available for analysis.
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