PMID: 3751686May 1, 1986Paper

The appearance of liquid surfaces and layers in routine radiographs

Acta Radiologica: Diagnosis
A E Nilson

Abstract

Image features in the radiograph produced by deformation of a liquid surface by surface tension and by the density gradient in a diffusion layer may present unexpected difficulty of interpretation. Such features have been analysed in model experiments, which have been reported earlier. The aim of the present investigation was to examine the occurrence and the clinical implications of corresponding phenomena in routine radiographs. In the human body liquid surfaces and diffusion layers can occur only in cavities, both normal and abnormal. A liquid surface tends to extend up a cavity wall to form a meniscoid or, if the cavity is small enough, a discoid. The liquid surface continues further up the wall as a liquid film. The shape of the meniscoid and the discoid varies with the shape and inclination of the wall. Most of the image features of interest are produced by rays that are tangential to a horizontal surface, a meniscoid, a discoid or a concave wall, any of which is visualized as an internal boundary with a light Mach line. When the wall is convex towards the cavity the meniscoid is saddle-shaped and an external boundary with a dark Mach line is produced. The horizontal part of a liquid surface can be touched only if it is a...Continue Reading

References

Aug 1, 1975·The American Journal of Digestive Diseases·D Bryk, E Moadel
Mar 1, 1986·Acta Radiologica: Diagnosis·A E Nilson
May 1, 1985·Acta Radiologica: Diagnosis·A E Nilson
Jun 1, 1972·Scientific American·F Ratliff
Nov 1, 1955·The British Journal of Radiology·J FRIMANN-DAHL
Dec 1, 1956·Radiology·H S BERLINJ STEIN

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