| Literature DB >> 441336 |
K J Taylor, P Jacobson, C C Jaffe.
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.Entities:
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Year: 1979 PMID： 441336 DOI： 10.1148/131.2.463
Source DB: PubMed Journal: Radiology ISSN： 0033-8419 Impact factor: 11.105