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Noise reduction and aliasing compensation in a doppler mode image

  • US 8,357,096 B2
  • Filed: 01/09/2009
  • Issued: 01/22/2013
  • Est. Priority Date: 01/10/2008
  • Status: Active Grant
First Claim
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1. An ultrasound system, comprising:

  • a transmission/reception unit operable to transmit/receive ultrasound signals in a pulse repetition frequency (PRF) to form an n number of Doppler signals;

    a signal processing unit operable to compute a first mean frequency based on an nth Doppler signal and an (n−

    1)th Doppler signal and a second mean frequency based on an nth Doppler signal and an (n−

    k)th Doppler signal, respectively, wherein k is a positive integer equal to or greater than 2, the signal processing unit being further operable to check whether the first and second mean frequencies exist within predetermined frequency ranges associated with the PRF, respectively, to determine occurrence of aliasing in the Doppler signals and compensate for the aliasing of the Doppler signals to thereby produce Doppler signals with the aliasing compensated;

    wherein the signal processing unit includes a quadrature demodulating unit operable to demodulate the Doppler signals into baseband signals consisting of an I signal of an in-phase component and a Q signal of a quadrature component, andwherein the signal processing unit is operable to compute the first and mean frequencies through following equations,

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