Acoustic shadowing

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

Imaging technology

Article information

rID: 24967
Synonyms or Alternate Spellings:
  • Posterior acoustic shadowing
  • Sonographic acoustic shadowing

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Cases and figures

  • Case 1: cholelithiasis - acoustic shadowing
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  • Case 2: appendicolith - 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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