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British Journal of Radiology (1995) 68, 1212-1214
© 1995 British Institute of Radiology
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The British Journal of Radiology, Vol 68, Issue 815 1212-1214, Copyright © 1995 by British Institute of Radiology

ARTICLES

Broadband ultrasonic attenuation: are current measurement techniques inherently inaccurate?

GW Petley, PA Robins and JD Aindow
Medical Physics & Medical Engineering Department, Southampton University Hospitals NHS Trust, Southampton General Hospital, UK.

Measurements of broadband ultrasonic attenuation (BUA) are currently made using large aperture, piezoelectric transducers. The use of such a receiver is known to lead to the possibility of an overestimate of ultrasonic attenuation due to phase cancellation and it is shown theoretically that this same effect can also lead to an overestimate of BUA. Using a new scanning approach, BUA was measured using two methods, one sensitive to the phase of the acoustic wave, the other not. The phase sensitive BUA measurements were found to be of significantly higher value (p < 0.0001) than the phase insensitive measurements with a mean difference of 31.2 dB MHz-1. These findings are compatible with the hypothesis that BUA measurement systems with large aperture, piezo-electric receivers are inherently inaccurate.




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