Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Reexamination Certificate
2006-11-30
2008-09-02
Barlow, John E. (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
C702S195000
Reexamination Certificate
active
07421377
ABSTRACT:
Present application provides a method for suppressing noise in a spectral Doppler system, comprising the steps of: obtaining a power spectrum of Doppler signals demodulated in the spectral Doppler system, by performing spectral analysis on the Doppler signals; estimating an average noise power of the spectral Doppler system; designing a noise suppression filter by determining its filter coefficients based on the power spectrum of the Doppler signals and the estimated average noise power; filtering the Doppler signals by using the designed noise suppression filter so as to reduce the noise.
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patent: 5935074 (1999-08-01), Mo et al.
patent: 6251077 (2001-06-01), Mo et al.
patent: 6296612 (2001-10-01), Mo et al.
patent: 6577967 (2003-06-01), Mo et al.
patent: 2007/0016045 (2007-01-01), Zhang
patent: 1440726 (2003-09-01), None
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patent: 2003079626 (2003-03-01), None
“Doppler ultrasound signal denoising based on wavelet frames”, IEEE, Trans Ultrason Ferroelectr Freq Contr, vol. 3 p. 709-716, 2001.
“Denoising quadrature Doppler signals using the wavelet frame” see Ibid, vol. 5 p. 561-564, 2003.
“Doppler ultrasound spectral enhancement using the Gabor transform based spectral subtraction”, see Ibid, vol. 10 p. 1861-1.
Barlow John E.
Christensen Kory D.
Shenzhen Mindray Bio-Medical Electronics Co., Ltd.
Stoel Rives LLP
Washburn Douglas N
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