Method and apparatus for ultrasonic beamforming using golay-coded excitation
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United States of America Patent
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Nov 14, 2000
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app pub date -
Feb 23, 1999
filing date -
Feb 23, 1999
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Abstract
A method and apparatus for improving the SNR in medical ultrasound imaging utilize Golay-coded excitation of the transducer array. A Golay pair is a pair of binary (+1,-1) sequences with the property that the sum of the autocorrelations of the two sequences is a Kronecker delta function. This translates into two important advantages over codes in general: (1) Golay codes have no range sidelobes, and (2) Golay codes can be transmitted using only a bipolar pulser versus a more expensive digital-to-analog converter. Degradation of the Golay code is avoided by employing multiple focal zones, where the Golay code is used only in the deepest focal zones in order to minimize dynamic focusing effects, and by employing two consecutive transmits on each beam to minimize tissue motion between the two code sequences.
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