Abstract
This paper discusses a new Doppler device for measuring blood flow in small vessels. The ultrasound frequency applied is 20M Hz. Two different ultrasound probes were designed with transducer diameters of 0.9 mm and 1.6 mm. The transducers were located at the point of a catheter. As measured at 1.5 mm depth, the lateral resolutions were 1 mm and 1.7 mm, respectively. The flowmeter is very sensitive. Compared with standard flowmeters (from 2 to 8 MHz), signals from subcutaneous vessels are greater by 10-20 dB.References
[1] D.W. BAKER, F.X. FORSTER and R.E. DAIGLE, Doppler principle and technique, in: Ultrasound, its application in medicine and biology, [Ed.] F.J. Fry Chapter 3, 161-287, Elsavier Sc. Publ Company, New York 1978.
[2] M. BERSON, F. PATAT, Z.Q. WANG, D. BASSE and L. POURCELOT, Very high frequency pulsed Doppler apparatus, Ultrasound in Med. and Biol, 15, 2, 121-131 (1989).
[3] D. CATHIGNOL, J.Z. CHAPELON, J.L. MESTAS and C. FURCADE, Description et application d'un velocimetre ultrasonore Doppler pour les petits vaisseaux, Med. and Biol. Eng., 21, 358-364 (1983).
[2] M. BERSON, F. PATAT, Z.Q. WANG, D. BASSE and L. POURCELOT, Very high frequency pulsed Doppler apparatus, Ultrasound in Med. and Biol, 15, 2, 121-131 (1989).
[3] D. CATHIGNOL, J.Z. CHAPELON, J.L. MESTAS and C. FURCADE, Description et application d'un velocimetre ultrasonore Doppler pour les petits vaisseaux, Med. and Biol. Eng., 21, 358-364 (1983).
