Title :
Spectral Broadening in Ultrasonic Doppler Flowmeters Due to Unsteady Flow
Author :
Kikkawa, Sho ; Yamaguchi, Takami ; Tanishita, Kazuo ; Sugawara, Motoaki
Author_Institution :
Department of Surgical Science, the Heart Institute of Japan, Tokyo Women´´s Medical College
fDate :
5/1/1987 12:00:00 AM
Abstract :
It is shown that time-varying velocity produces frequency modulation of the backscattered signal in ultrasonic Doppler flowmeters. Further, for blood flow in the ascending aorta, it is estimated that the spectrum of the backscattered signal would have a very wide bandwidth in the acceleration phase.
Keywords :
Acceleration; Acoustic beams; Acoustic scattering; Blood flow; Frequency modulation; Particle beams; Particle scattering; Phase estimation; Ultrasonic imaging; Ultrasonic transducers; Aorta; Biomedical Engineering; Blood Flow Velocity; Humans; Models, Cardiovascular; Models, Theoretical; Rheology;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.1987.325970
