Blood flow measurement system
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United States of America Patent
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Feb 4, 1997
Grant Date -
N/A
app pub date -
Sep 15, 1994
filing date -
Sep 24, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A blood flow measurement system for measuring blood flow rate and blood flow velocity comprises a circuit device for irradiating an in vivo tissue measurement subject with coherent light, a light receiving element for receiving scattered light from the in vivo tissue, a converter for converting an intensity of the received scattered light into an electric signal, a circuit device for calculating a power spectrum of the time-course variation of the scattered light intensity, a device for plotting the power spectrum in a semilogarithmic coordinate system having a logarithmic vertical axis, and a device for linearly approximating a prescribed frequency component of the semilogarithmic power spectrum and calculating a slope and a y intercept of the power spectrum curve. The blood flow velocity can be determined from the slope of the curve approximating the power spectrum, while blood flow rate can be determined from the slope and y intercept of the curve approximating the power spectrum.
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