Patent ID: 9097794
Filing Date: 2015-08-04
Classification: G01S

Abstract:
1. An ultrasound Doppler detection method with Golay-encoded excitation for obtaining flow information of a moving object, the method comprising following steps: (a) transmitting a first Golay code to the moving object for a first reflection signal; (b) after a pulse repetition interval, transmitting a second Golay code to the moving object for a second reflection signal, wherein the reciprocal of the pulse repetition interval is a pulse repetition frequency; (c) repeating step (a) and then step (b) for N times to obtain N first reflection signals and N second reflection signals; (d) performing a first match-filtering on the first reflection signals to generate N first waves, performing a second match-filtering on the second reflection signals to generate N second waves, wherein each of the first waves includes a first mainlobe and a plurality of first sidelobes, and each of the second waves includes a second mainlobe and a plurality of second sidelobes; (e) analyzing the first waves and the second waves in a Doppler frequency domain of a slow-time to generate a Doppler wave, wherein the Doppler wave includes a mainlobe part and at least a sidelobe part, the mainlobe part includes the first mainlobe and the second mainlobe, and the sidelobe part includes the first sidelobes and the second sidelobes; (f) low-pass filtering out the first sidelobes of the first waves and the second sidelobes of the second waves by a filter, wherein a low-pass cut-off frequency of the filter is a quarter of the pulse repetition frequency; and (g) forming the ultrasound Doppler detection according to the first mainlobes of the first waves and the second mainlobes of the second waves.