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Multifrequency Doppler flowmeter: a way to rapid CW Doppler imaging

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3 Author(s)
Cathignol, D.J. ; Inst. Nat. de la Sante et de la Recherche Medicale, Lyon, France ; Birer, A. ; Unterreiner, R.

A single CW velocimeter for two-dimensional Doppler imaging yields a low frame rate because the single transducer pair must be moved in the x, y plane. The authors propose to increase the frame rate by measuring simultaneously the flow in several directions using several transmitter/receiver pairs, each with a unique emission frequency and having a separate CW velocimeter. The results obtained with a prototype composed of eight channels show that (1) the lateral resolution and the sensitivity of each channel are not affected by interference from the adjacent channels; and (2) it is possible to measure the flow simultaneously in multiple cross sections because the ultrasonic beams are independent.

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Biomedical Engineering, IEEE Transactions on  (Volume:35 ,  Issue: 5 )