The measurement of backscatter coefficient from a broadband pulse-echo system: a new formulation

A new formulation for obtaining the absolute backscatter coefficient from pulse-echo measurements is presented. Using this formulation, performing the diffraction correction and system calibration is straightforward. The diffraction correction function for the measurement of backscatter coefficient...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1997-03, Vol.44 (2), p.515-525
Main Authors: Xucai Chen, Phillips, D., Schwarz, K.Q., Mottley, J.G., Parker, K.J.
Format: Article
Language:English
Subjects:
Acoustic diffraction
Acoustic measurements
Acoustic pulses
Acoustic scattering
Acoustic transducers
Acoustics
Backscatter
Calibration
Exact sciences and technology
Frequency
Fundamental areas of phenomenology (including applications)
Physics
Pulse measurements
Q measurement
Transduction
acoustical devices for the generation and reproduction of sound
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Summary:A new formulation for obtaining the absolute backscatter coefficient from pulse-echo measurements is presented. Using this formulation, performing the diffraction correction and system calibration is straightforward. The diffraction correction function for the measurement of backscatter coefficient and the acoustic coupling function for a pulse-echo system are defined. Details of these functions for two very useful cases are presented: a flat disk transducer and a spherically focused transducer. Approximations of these functions are also provided. For a flat disk transducer, the final formulation appears as a modification to the established Sigelmann-Reid formulation. For a focused transducer, the final correction is a weak function of frequency when the scattering volume is near the focal area, rather than the frequency squared dependence proposed by earlier investigators.
ISSN:0885-3010
1525-8955
DOI:10.1109/58.585136