Acoustic shadowing

Last revised by Dr Mohammad Osama Hussein Yonso on 14 Dec 2020

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

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Cases and figures

  • Case 1: cholelithiasis - acoustic shadowing
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  • Case 3: renal calculus - acoustic shadowing
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  • Case 4: foreign body in foot - thorn
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  • Case 5: Gas in colonic diverticulum
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  • Case 6: Intraluminal GB gas and pneumobilia
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