Fig. 1
From: Assessment of carotid artery ultrasonography in the presence of an acoustic shadow artifact
Acoustic Shadow on Sonographic imaging. Legend: Sonographic examples of a small (A + B) and large (C + D) AS (Acoustic shadow) artifact. B-mode ultrasonography of carotid bifurcation demonstrating an atherosclerotic plaque with a small (a) and large (c) AS artifact. Color Doppler ultrasonography images of carotid artery bifurcation demonstrating an atherosclerotic plaque with a small (b) and large (d) AS artifact