According to the principle of view the Doppler frequency detection, the detector makes up of the transmitter, the transfer circuit, receiver and signal processing circuit.
The simulation result shows that VPSD is a kind of constant false alarm rate detector, which can detect HFM signal effectively in low SNR, and can adapt to the Doppler mismatch very well.
Color Doppler ultrasound study of 150 patients detector object carotid ultrasonography, observed the nature of carotid artery plaque, and serum high-sensitivity C-reactive protein levels.