Method and device for a blood velocity determination
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United States of America Patent
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Jul 17, 2001
Grant Date -
N/A
app pub date -
Jul 1, 1998
filing date -
Jan 5, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of determining the velocity of a flowing material, suspended in a liquid and flowing in a conduit, including irradiating the conduit with ultrasonic waves, detecting first Doppler-shifted reflections of the waves from the material, which first reflections have a positive Doppler-shift, and detecting second Doppler shifted reflections of the waves from the material, which second reflections have a negative Doppler-shift. The flow velocity is estimated based on the extent of the positive and negative Doppler-shifts. The first and second reflections may be summed to form a composite signal and the range of Doppler-shifts in the composite signal is used to estimate the flow velocity.
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