Method and apparatus for acoustic subtraction imaging using linear and nonlinear ultrasonic images
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United States of America Patent
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Jan 4, 2000
Grant Date -
N/A
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1998
priority date (Note) -
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Abstract
A method and an apparatus for imaging a nonlinear signal component isolated from the echo signal derived from transmission of a base waveform having fundamental frequency f.sub.0 and relatively high peak power. The nonlinear signal component is isolated by subtracting the linear signal component from the echo signal. This is accomplished using a second transmit firing derived from the same base waveform, but having different transmit characteristics, i.e., the base waveform is convolved with a code sequence to form a coded waveform. The coded waveform is transmitted at relatively low peak power. The beamsummed signal produced from the low-peak-power coded transmit is pulse compressed and then subtracted from the beamsummed signal produced from the high-peak-power uncoded transmit. The signals are scaled as necessary to achieve cancellation of the linear signal components when one beamsummed signal is subtracted from the other, leaving the nonlinear signal component for imaging.
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