Spectral analysis as a method of quantitative interpretation of Doppler-shift signals

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Abstract
The accuracy of the use of spectral analysis as a method of quantitative interpretation of Doppler-shift flow signals from chronically implanted probes was investigated in sheep and ponies. Doppler-shift flow probes, chronically implanted around the pulmonary artery, were used to obtain a continuous beat-by-beat measurement of cardiac output. The average velocity blood flow in the vessel was found by spectral analysis, and output calculated using the internal diameter of the vessel. The results were compared with those obtained simultaneously by the dye dilution method. In these circumstances the Doppler-shift flow probes gave results which accurately reflected changes in cardiac output, and which were quantitatively at least as accurate as those measured by dye-dilution methods.

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