Posterior acoustic shadowing

Schallschatten
bei Cholecystolithiasis mit großem, mutmaßlich verkalktem Konkrement.
Wikipedia • CC BY-SA 4.0
gallbladder
with gallstone in sonography
Wikipedia • CC-BY-SA-3.0
editAbdominal
ultrasonography of an 83 year old man who experienced biliary colic two weeks prior.It shows a gallbladder wall that is almost pathologically thickened, at 3 mm. However, there is no apparent edema in the pericholecystic fat. The gallbladder contains biliary sludge, as well as gallstones, which create acoustic shadowing. There is thus gallstones without current cholecystitis. Without annotations Annotated raster (.jpg) Annotated vector (.svg)
Wikipedia • CC0
Staghorn
calculi filling the entire collecting system and creating pronounced shadowing. For context, see en:Renal ultrasonography
Wikipedia • CC BY 4.0
Radiopaedia • CC-by-nc-sa 3.0 • de

The phenomenon of acoustic shadowing (sometimes, somewhat tautologically, called posterior acoustic shadowing) on an ultrasound image is characterized by a signal void behind structures that strongly absorb or reflect ultrasonic waves. It is a form of imaging artifact. This happens most frequently with solid structures, as sound conducts most rapidly in areas where molecules are closely packed, such as in bone or stones.

See also

Siehe auch:
Assoziationen und Differentialdiagnosen zu Schallschatten:
Artefakte in
der Sonographie
Wikipedia • CC BY-SA 4.0