Acoustic radiation force impulse elastography for hepatocellular carcinoma-associated radiofrequency ablation

Figure 3 Post-radiofrequency ablation hepatocellular carcinoma in a 71-year-old woman with underlying liver cirrhosis. A: Contrast-enhanced arterial phase computed tomography scan obtained immediately after radiofrequency ablation (RFA) shows the ablation zone of low attenuation (asterisk) with a surrounding ring of benign enhancement (arrows) in segment 5 of the liver; B: Next day, follow up B-mode image of post-RFA hepatocellular carcinoma (HCC) is seen as an ill-defined heterogeneous echogenic lesion (arrow) and the HCC appears darker on the acoustic radiation force impulse image (asterisk); C: The shear wave velocity of post-RFA HCC is uncheckable, shown as X.XX m/s. GEN: General; SC: Spatial compounding; Vs: Velocity.