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TYPES OF BLOOD FLOWMETERS
DIRECTIONAL OFFSETFREQUENCY FLOWMETER CIRCUITRY
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accurate additive noise amplifier amplitude angle ascending aorta average output blood flow blood velocity blood vessel burst repetition frequency calibration canine descending aorta cardiac cycle Chapter Circuits cm/sec convert cross-sectional area cuff demodulator detector in response directional flowmeter doppler-shifted error at zero factor Figure flow measurement flow profile flowmeter signal function gates gaussian process Hewlett-Packard in-vitro in-vivo measurements Integrated Circuits intraoperative J.D. Meindl main oscillator mean output method noise sources nonoffset notch filter offset frequency OFFSET-FREQUENCY FLOWMETER offset-frequency technique optimization procedure OUTPUT OF ZERO-CROSS percent error probe Proc pulsed ultrasonic pulsed-doppler R.W. Gill result reverse flow rms output samples signal processing signal spectra signal-to-noise ratio sine wave spatial average velocity spectral spreading spectrum Stanford Stochastic Processes theory transducer transmit burst Ultrasonic Blood Flowmeter ultrasonic flowmeter variance variation velocity of sound velocity profile vessel diameter voltage volume volume-flow estimate Wavetek weighted sum zero flow zero frequency zero-cross detector