Considerations on Signal-To-Noise Ratio in a Continuous Wave Doppler System Using an Array Transducer
Phased array systems using ultrasound waves have been widely used to produce cross-sectional images of the heart in recent years. Ultrasonic Doppler techniques also supply useful diagnostic information on blood flow in living organs. In the Doppler technique, continuous wave Doppler (CWD) is used to measure high blood flow velocity quantitatively, and it is very desirable that this CWD function be implemented in phased array systems. There has been some commercial equipment in which the CWD is available, however, it lacked measurement sensitivity.
KeywordsAttenuation Acoustics Summing Hydrophone
Unable to display preview. Download preview PDF.
- 1.Lord Rayleigh “Theory of Sound”(Dover Publ., New York, 1945) Vol. 2, P. 107Google Scholar
- 2.Y. Torikai, IECE Technical report on Ultrasound (in Japanese). Nov. 16, 1962Google Scholar
- 3.J. Saneyoshi, Y. Kikuchi, O. Nomoto, “Technical Handbook on Ultrasound” (Nikkan Kougyo Shinbun), 1968, P. 1415Google Scholar
- 4.M. Okujima, S. Ohtsuki, Approximation evaluation of beam width of a concave-surface transducer and variable aperture transducer, J.J.M.U., Vol. 5, No. 2, P. 9Google Scholar