Method and apparatus for ultrasound imaging
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United States of America Patent
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Nov 14, 1995
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N/A
app pub date -
Jun 2, 1994
filing date -
Jun 2, 1994
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Abstract
Ultrasound imaging of an object is effected by directing a first and a second ultrasound pulse emitted by a transducer along a beam propagation direction against an object to be imaged. The second pulse has a transducer-to-object propagation time greater than the first pulse, the propagation time difference being achieved by selectively varying the effective or acoustic distance between the transducer and the object. A second scanline signal returned from the object as an echo of the second pulse is time-shifted as a function of the propagation time difference and is subtracted from the first scanline signal returned from the object as an echo of the first pulse, thereby significantly reducing from the resulting signal reverberation echoes between the transducer and the object. Transducer arrangements for providing the relative propagation time difference of the first and second pulses operatively vary the acoustic distance between the transducer and the object.
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