Depth dependent bandpass of ultrasound signals using heterodyne mixing
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United States of America Patent
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Jun 15, 1993
Grant Date -
N/A
app pub date -
Jan 14, 1992
filing date -
Jan 14, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasound imaging system and method for examining the interior of an object. The imaging system includes an apparatus for transmitting and receiving ultrasound waves. A receiver amplifies echo signals from over a range of depths from within the object and generates electrical signals, each having a spatial spectrum. The imaging system also includes a compensation apparatus which compensates the spectral distribution of the signal by sweeping the spectrum of the signals in accordance with the depth from which the echo signals are reflected. In the currently preferred embodiment, the compensation apparatus sweeps from the low frequencies to the high frequencies of the spectrum.
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