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An FPGA-based class-D power amplifier is designed for driving an ultrasonic transducer. The amplifier is capable of automatically detecting and tracking the transducer's resonant frequency, driving the transducer right at its resonance for maximizing vibration efficiency. The design focuses on devising resonant frequency tracking and optimal modulation algorithms that are suitable for FPGA implementation.
The ultra-high frame rate 3D high frequency ultrasound zebrafish heart image was reconstructed by using the Doppler triggering method in this study. The detailed changes of zebrafish cardiac volume were monitored during the cardiac cycle. A 40 MHz pulsed wave Doppler flowmeter was built for measuring the Doppler spectrogram from zebrafish artery, and the timing of peak flow velocity was selected by...
The echogenicity of whole blood is known to vary during the flow cycle under pulsatile flow both in vitro and in vivo. However, the fundamental underlying mechanisms remain uncertain. The cyclic variations of high frequency ultrasonic backscattering signals have been measured for explaining the temporal variations of red blood cells (RBCs) aggregation under pulsatile flow. The level of RBC aggregation...
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