Response characteristics of a finite aperture, phase insensitive ultrasonic receiver based upon the acoustoelectric effect

Busse, L.J.; Miller, James G.

doi:10.1121/1.387127

Cited by 71 publications

(21 citation statements)

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“…As a result, signals from a relatively large (compared to the wavelength) phase sensitive receiving aperture (real or simulated) will be subject to phase cancellation at its face. 41,42 This phase cancellation represents irretrievable loss of information that will appear as apparent attenuation. Similar examples of phase cancellation appearing as apparent attenuation in bone have been reported previously.…”

Section: Discussionmentioning

confidence: 99%

Determining attenuation properties of interfering fast and slow ultrasonic waves in cancellous bone

Nelson

Hoffman

Anderson

et al. 2011

The Journal of the Acoustical Society of America

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Previous studies have shown that interference between fast waves and slow waves can lead to observed negative dispersion in cancellous bone. In this study, the effects of overlapping fast and slow waves on measurements of the apparent attenuation as a function of propagation distance are investigated along with methods of analysis used to determine the attenuation properties. Two methods are applied to simulated data that were generated based on experimentally acquired signals taken from a bovine specimen. The first method uses a time-domain approach that was dictated by constraints imposed by the partial overlap of fast and slow waves. The second method uses a frequency-domain log-spectral subtraction technique on the separated fast and slow waves. Applying the time-domain analysis to the broadband data yields apparent attenuation behavior that is larger in the early stages of propagation and decreases as the wave travels deeper. In contrast, performing frequency-domain analysis on the separated fast waves and slow waves results in attenuation coefficients that are independent of propagation distance. Results suggest that features arising from the analysis of overlapping two-mode data may represent an alternate explanation for the previously reported apparent dependence on propagation distance of the attenuation coefficient of cancellous bone.

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Section: Discussionmentioning

confidence: 99%

Determining attenuation properties of interfering fast and slow ultrasonic waves in cancellous bone

Nelson

Hoffman

Anderson

et al. 2011

The Journal of the Acoustical Society of America

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“…Local compressions and expansions produce surface charge distributions of opposite sign in the piezoelectric receiving transducer's conductive plating. 27 The associated currents in these electrodes result in an irrecoverable loss of energy as a result of current flow among locally produced positive and negative electrical signals. The purpose of the present study is to illustrate how the size of the receiving aperture influences estimates of apparent attenuation as a result of diffraction and interference occurring in the field and phase cancellation occurring at the surface of a piezoelectric receiver.…”

Section: Introductionmentioning

confidence: 99%

Bone sonometry: Reducing phase aberration to improve estimates of broadband ultrasonic attenuation

Bauer

Anderson

Holland

et al. 2009

The Journal of the Acoustical Society of America

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Previous studies suggest that phase cancellation at the receiving transducer can result in the overestimation of the frequency dependent ultrasonic attenuation of bone, a quantity that has been shown to correlate with bone mineral density and ultimately with osteoporotic fracture risk. Evidence supporting this interpretation is provided by phase insensitive processing of the data, which appear to reduce the apparent overestimates of attenuation. The present study was designed to clarify the components underlying phase aberration artifacts in such through-transmission measurements by conducting systematic studies of the simplest possible test objects capable of introducing phase aberration. Experimental results are presented for a Lexan phantom over the frequency range 300-700 kHz and a Plexiglas phantom over the 3 -7 MHz range. Both phantoms were flat and parallel plates featuring a step discontinuity milled into one of their initially flat sides. The through-transmitted signals were received by a 0.6 mm diameter membrane hydrophone that was raster scanned over a grid coaxial with the transmitting transducer. Signals received by the pseudoarray were processed offline to emulate phase sensitive and phase insensitive receivers with different aperture diameters. The data processed phase sensitively were focused to demonstrate the results of planar, geometrical, and correlation-based aberration correction methods. Results are presented illustrating the relative roles of interference in the ultrasonic field and phase cancellation at the receiving transducer in producing phase aberration artifacts. It was found that artifacts due to phase cancellation or interference can only be minimized with phase insensitive summation techniques by choosing an appropriately large receiving aperture. Data also suggest the potentially confounding role of time-and frequency-domain artifacts on ultrasonic measurements and illustrate the advantages of two-dimensional receiving arrays in determining the slope of attenuation ͑nBUA͒ for the clinical assessment of osteoporosis.

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“…The frequency average of the backscatter transfer function, termed the integrated backscatter, provides a useful index of backscatter efficiency over a finite bandwidth [lS,16). Frequency averaging over a broad bandwidth reduces the degrading influence ofphase cancelIation[lS, [17][18][19][20] and otherinterference effects which can compromise the results ofbackscatter measurements. The useful bandwidth chosen for alI ofthe results presented in Section III of this manuscript was over a range from 6 to 12 MHz.…”

Section: Measurement Methodsmentioning

confidence: 99%

Effects of bleeder cloth impressions on the use of polar backscatter to detect porosity

1993

NDT & E International

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Response characteristics of a finite aperture, phase insensitive ultrasonic receiver based upon the acoustoelectric effect

Cited by 71 publications

References 0 publications

Determining attenuation properties of interfering fast and slow ultrasonic waves in cancellous bone

Determining attenuation properties of interfering fast and slow ultrasonic waves in cancellous bone

Bone sonometry: Reducing phase aberration to improve estimates of broadband ultrasonic attenuation

Effects of bleeder cloth impressions on the use of polar backscatter to detect porosity

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