Key result
Z80-based system enables real-time Doppler ultrasound frequency analysis for blood flow studies.
Why the study?
Digital integrated circuits specifically designed for signal processing applications are becoming available and can be applied to Doppler ultrasound frequency analysis.
May facilitate real-time Doppler blood flow analysis; leaves open prospective validation before clinical adoption.
A number of digital integrated circuits are becoming available that are specifically designed for signal processing applications (Godbole and Ali, 1981). The American Microsystems Inc. S2814A is a version of a signal processing circuit that has been specifically programmed to perform the fast Fourier transform (AMI, 1982). (The S2814A is shortly to be replaced by the compatible but redesigned S28214.) A system is described in which this circuit is used to provide frequency analysis of Doppler ultrasound signals from transcutaneous aortovelography measurements. The AMI S2814A has been incorporated into a Z80 microprocessor, S100 bus based system so that the Fourier transform values can be used immediately for further computer processing such as the calculation of the area under the maximum frequency envelope (i.e. relative stroke volume (Cross and Light, 1974)).
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C. I. Franks (1984) studied this question. AMI S2814A fast Fourier transform signal processing integrated circuit was evaluated. A system incorporating the AMI S2814A integrated circuit into a Z80 microprocessor was described to provide immediate frequency analysis of Doppler ultrasound signals for blood flow studies.
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