Method and apparatus for ultrasonic beamforming using golay-code

Details Method and apparatus for ultrasonic beamforming using golay-code Method and apparatus for ultrasonic beamforming using golay-code

1999-02-23

2000-11-14

Jaworski, Franics J.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600447, A61B 800

Patent

active

061463280

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.

REFERENCES:
patent: 5014712 (1991-05-01), O'Donnell
patent: 5984869 (1999-11-01), Chiao et al.

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