Apparatus and method for obtaining ultrasonic backcatter measurement from tissue
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United States of America Patent
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Nov 21, 1989
Issued Date -
N/A
app pub date -
Jul 14, 1988
filing date -
May 29, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Optimal measurement of ultrasonic random backscatter from the myocardium is obtained by band limiting and whitening the received signal, squaring, summing and scaling same. The whitening is carried out for all spectrally altering factors to which the ultrasonic signal has been subjected. This includes whitening for the power law frequency response characterstics of the myocardium itself. Scaling includes a factor accounting for the energy of the effective transmitted ultrasonic signal and a factor providing appropriate units of measurement. The optimal measurement may be time averaged over one or more heartbeats for use in the diagnosis of ischemia or other cardiac conditions. It may be subjected to discrete Fourier transform analysis, to obtain its amplitude modulation and phase characteristics for similar purposes.
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