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acoustic algorithms amplifier amplitude arteries arterioles beam blood flow blood perfusion measurement blood perfusion value calculated capillaries clinical Coherent demodulation cross-section Department of Electrical diameter diffraction Doppler method Doppler shift Doppler signal processing Doppler transducer Doppler ultrasound Dymling Electrical Measurements experiments Figure flow model glycerol Hertz hydrophone hydrophone measurements in-vivo integral interface interference pattern Kjell Lindstrom laser Doppler flowmeter low-pass filter Lund Institute measured blood perfusion measurement of blood measurement system ments micro circulation mm/s motion artifact movements moving blood multi-frequency Doppler non-coherent demodulation occlusion optical diffraction tomography oscillator overall sensitivity pattern particles perfusion in tissue perfusion signal Persson power spectrum processor quency received signal receiving transducer reconstruction red blood cells result Roger Eriksson sample volume scattered simulated speckle surement theoretical transducer surface tubes ultra ultrasonic Doppler ultrasonic field ultrasonic interference ultrasonic wave interference ultrasound reflected ultrasound transducer variations vessels vivo measurements wave interference