acoustic shadow

(redirected from Sound shadow)
Also found in: Encyclopedia.

a·cous·tic shad·ow

sonographic appearance of reduced echo amplitude from regions lying beyond an attenuating object. Compare: acoustic enhancement.

acoustic shadow

in an ultrasound image, the absence of echoes produced by the presence of dense material, such as calculi, which impede the transmission of sound waves. It is often used to detect biliary calculi.
References in periodicals archive ?
These townhouses have a sound-stopping membrane produced and used in Europe This system creates a sound shadow for the total development.
The sound shadow instrumental Fearless, with great hysterical brass, and the dance recall of Nights Over Egypt rescue this ten-track album from Chardonnay hell, but only just.
Ross' book has a lot to recommend it for it tells us about the military consequences of sound shadows, the atmospheric and physical distortion of sounds, during some important Civil War battles.