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Method and apparatus for automatic optimization of doppler imaging parameters

  • US 8,142,361 B2
  • Filed: 08/26/2008
  • Issued: 03/27/2012
  • Est. Priority Date: 08/28/2007
  • Status: Active Grant
First Claim
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1. A method for automatic optimization of Doppler imaging parameters including at least one of a pulse repetition frequency and a baseline, the method comprising:

  • obtaining at least two characteristic spectral lines at a predetermined pulse repetition frequency, wherein the at least two characteristic spectral lines include a maximum power spectral line and a mean power spectral line;

    storing the at least two characteristic spectral lines; and

    optimizing at least one of the Doppler imaging parameters based on the stored at least two characteristic spectral lines and a predetermined mean noise power,wherein the at least two characteristic spectral lines are obtained by collecting in real time Doppler spectral lines generated at the predetermined pulse repetition frequency within a predetermined time period, and processing the collected Doppler spectral lines in real time without storing themwherein optimizing the at least one of the Doppler imaging parameters comprises;

    filtering out power values of the maximum power spectral line and the mean power spectral line within a frequency cutoff range of wall filtering, thereby obtaining a new maximum power spectral line and a new mean power spectral line;

    determining a frequency bin corresponding to a minimum power value of the new maximum power spectral line;

    deciding whether or not a multi-aliasing occurs by comparing a power value of the new mean power spectral line corresponding to the determined frequency bin with a first threshold value, wherein if the power value of the new mean power spectral line corresponding to the determined frequency bin is larger than the first threshold value, it is determined that the multi-aliasing occurs;

    otherwise, no multi-aliasing occurs;

    searching for boundaries of a blood flow signal based on the new maximum power spectral line and the predetermined mean noise power if no multi-aliasing occurs, wherein the boundaries of the blood flow signal include both a positive frequency boundary and a negative frequency boundary;

    adjusting the pulse repetition frequency down to a minimum value and the baseline to a center of a display area if no boundaries of the blood flow signal are found; and

    adjusting at least one of the Doppler imaging parameters based on the boundaries of the blood flow signal if the boundaries of the blood flow signal are found.

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