Ultrasonic Blood Flow Sensing using Doppler Velocimetry
| Autor: | Matthew Micheli, Daniel Arroyo, Martin Kocanda, Jeremy Hillard, Michelle Case |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
cardiac sensing
Acoustics lcsh:Technology Signal velocity profiles symbols.namesake spectrogram Ultrasonic flow meter lcsh:Technology (General) Acoustic Doppler velocimetry Electrical and Electronic Engineering signal processing ultrasonic flow meter Physics Matlab™ Signal processing velocimetry lcsh:T Doppler Effect Velocimetry Laser Doppler velocimetry digital filters Control and Systems Engineering symbols lcsh:T1-995 Ultrasonic sensor Doppler effect |
| Zdroj: | International Journal on Smart Sensing and Intelligent Systems, Vol 6, Iss 4 (2013) |
| ISSN: | 1178-5608 |
| DOI: | 10.21307/ijssis-2017-591 |
| Popis: | Ultrasonic blood flow sensing is a non-invasive method for measuring blood flow velocity. The objective of this work is to produce a low-cost ultrasonic blood flow instrument utilizing Doppler shifted signals and enhanced signal processing methods. The instrument transmits a single-frequency signal into circulatory tissues and receives a signal that is Doppler shifted in proportion to velocity. Subsequent processing techniques produce an audio feedback signal whereby the user “hears” the flow characteristics. The circuit used consists of a transmitter, receiver, and frequency shifter. Signal processing is performed externally to produce velocity profiles of arterial blood flow using Matlab™ to create spectrograms and low-pass filtering on the recorded feedback signals. Spectrogram provide mapping of the velocity profiles. Resultant mapping indicate that velocity profiles have a roughly parabolic shape and that filtering is required to reduce high frequency noise. Signals were obtained using multiple cardiac stressors to determine the flow sensing performance. |
| Databáze: | OpenAIRE |
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