Pulsed Doppler accuracy assessment due to frequency-dependent attenuation and Rayleigh scattering error sources

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.<
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