AJR 2005; 184:83-90.
Kim HJ, Kim AY, Kim TK, Byun JH, Won HJ, Kim KW, Shin YM, Kim PN, Ha HK, Lee MG.
The widespread use of dual-phase dynamic CT has led to an improvement in the characterization and detection of focal hepatic lesions by highlighting the dynamic contrast-enhancement features. Transient hepatic attenuation difference (THAD) is an attenuation difference of the liver appearing during bolus-enhanced dynamic CT and not corresponding to mass [1], THAD is generally seen as an area of high attenuation on the hepatic arterial phase image that returns to normal attenuation on the portal venous phase image.