BROAD-BAND ULTRASONIC-ATTENUATION - ARE CURRENT MEASUREMENT TECHNIQUES INHERENTLY INACCURATE

被引：36

作者：

PETLEY, GW ^{[1
]}

ROBINS, PA ^{[1
]}

AINDOW, JD ^{[1
]}

机构：

[1] DORSET CTY HOSP, W DORSET GEN HOSP, DEPT PHYS MED, NHS TRUST, DORCHESTER DT5 1TS, ENGLAND

来源：

BRITISH JOURNAL OF RADIOLOGY | 1995年 / 68卷 / 815期

关键词：

D O I：

10.1259/0007-1285-68-815-1212

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Measurements of broadband ultrasonic attenuation (BUA) are currently made using large aperture, piezo-electric 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.

引用

页码：1212 / 1214

页数：3