DocumentCode :
1224428
Title :
Transcutaneous Blood Flow Measurements Using Pseudorandom Noise Doppler System
Author :
Cathignol, Dominique J. ; Fourcade, Claude ; Chapelon, Jean-Yves
Author_Institution :
Institut National de la Santéet de la Recerche Medicale
Issue :
1
fYear :
1980
Firstpage :
30
Lastpage :
36
Abstract :
In order to obviate the limitations of the conventional coherent ultrasonic Doppler flowmeters we have developed a new device. In this apparatus the continuous wave is replaced by a pseudorandom signal. We show, both theoretically (Waag et al. [12]) and experimentally, that the pseudorandom system offers advantages. The most important result concerns the improvement of the signal-to-noise ratio which can be as large as 20 dB. Furthermore, it is possible to decrease the frequency and the distance ambiguity by a factor of two. Compared to the "random noise flowmeter" (Newhouse et al. [7], Jethwa et al. [5]) our system measures flow near the wall of vessels or in ultrasonic field in which there are important fixed echoes. To illustrate the feasibility of this new device, we show some results obtained by the transcutaneous method.
Keywords :
Blood flow; Fluid flow measurement; Frequency; Gaussian noise; Humans; Laboratories; Noise measurement; Particle measurements; Signal to noise ratio; Ultrasonic variables measurement; Blood Flow Velocity; Doppler Effect; Humans; Models, Cardiovascular; Random Allocation; Rheology; Ultrasonics; Ultrasonography;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.1980.326688
Filename :
4123123
Link To Document :
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