Title :
Pulsed Doppler accuracy assessment due to frequency-dependent attenuation and Rayleigh scattering error sources
Author :
Embree, Paul M. ; O´Brien, W.D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA
fDate :
3/1/1990 12:00:00 AM
Abstract :
It is pointed out that frequency-dependent attenuation and Rayleigh scattering are significant error sources for pulsed Doppler ultrasound, used for human blood flow measurement, because the transmitted ultrasound signal has a finite width spectrum. The former causes a frequency downshift and the latter a frequency upshift, both of which are independent of the actual Doppler frequency shift. These error sources were evaluated through computer simulation, and the computed error is compared with experimental data.
Keywords :
Doppler effect; biomedical measurement; biomedical ultrasonics; flow measurement; haemodynamics; measurement errors; Doppler frequency shift; Rayleigh scattering error sources; computed error; computer simulation; finite width spectrum; frequency downshift; frequency upshift; frequency-dependent attenuation; human blood flow measurement; pulsed Doppler accuracy assessment; pulsed Doppler ultrasound; transmitted ultrasound signal; Attenuation measurement; Blood flow; Computer errors; Fluid flow measurement; Frequency measurement; Humans; Pulse measurements; Rayleigh scattering; Space vector pulse width modulation; Ultrasonic imaging; Blood Flow Velocity; Computer Simulation; Models, Cardiovascular; Regional Blood Flow; Ultrasonography;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
