胆结石扫描时缺乏声影：一种可能的伪像。

Lack of an acoustic shadow on scans of gallstones: a possible artifact.

作者信息

Taylor K J, Jacobson P, Jaffe C C

出版信息

Radiology. 1979 May;131(2):463-4. doi: 10.1148/131.2.463.

DOI:10.1148/131.2.463

Abstract

The high attenuation of gallstones results in the formation of an acoustic shadow on the ultrasound scan. Such shadows are best seen when the stone lies within the focal zone of the transducer and is large in comparison to the beam width or wavelength employed. Inadequecies in the dynamic range of available TV display units necessitate the use of compression-amplification signal processing which may preclude perception of such a shadow and seriously interfere with diagnostic accuracy.

摘要

胆结石的高衰减会在超声扫描时形成声影。当结石位于换能器的聚焦区内且相对于所使用的波束宽度或波长较大时，这种声影最容易被看到。现有电视显示单元动态范围的不足使得必须使用压缩放大信号处理，这可能会妨碍对这种声影的感知，并严重干扰诊断准确性。