Key result
pMUT-based pulsed wave Doppler successfully measures real-time pulsatile flow velocity in blood-mimicking fluid.
A novel pulsed wave Doppler ultrasound blood flowmeter using pMUTs successfully measured flow velocity and direction in a blood-mimicking fluid, demonstrating potential for real-time pulsatile flow monitoring.
Prototype pMUT flowmeter enables compact Doppler sensing; leaves open clinical translation and in vivo validation.
This letter describes a blood flowmeter by the pulsed wave Doppler (PWD) ultrasound detection procedure utilizing piezoelectric micromachined ultrasonic transducers (pMUTs) with the aluminum nitride (AlN) film as the piezoelectric material. The transceiver electronics for the PWD scheme are constructed for system control and signal processing, and a blood-mimicking fluid (BMF) is synthesized for flow velocity tests. Both the average Doppler frequency-shift and Doppler power spectrum density (PSD) shift with respect to the flow velocity have been characterized and validated, and the flow direction can also be recognized. Finally, a real-time pulsatile flow measurement is demonstrated to emulate the feasibility of monitoring blood flows in practice. [2021-0077]
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Ding et al. (2021) studied this question. Pulsed wave Doppler ultrasound blood flowmeter by pMUTs was evaluated on Flow velocity and direction measurement. A pulsed wave Doppler ultrasound blood flowmeter utilizing piezoelectric micromachined ultrasonic transducers successfully measured flow velocity, direction, and real-time pulsatile flow in a blood-mimicking fluid.
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