acoustic e. In ultrasonography, overamplification of echoes returning from behind
contrast e. Increase in definition obtained by using a material that accentuates vascular
structures, such as iodinated substances for computed tomography scans and gadolinium for magnetic resonance imaging scans.
ring e. In computed tomography, a bright circle seen on an image made after injection
of a contrast medium; indicates localization of the contrast on the periphery of an abscess.