Which phase of CT is best for assessing liver lesions?Question 19Select one:a.Pre-contrastb.Delayedc.Portal venousd.Arterial

Answer

The best phase of CT for assessing liver lesions is the portal venous phase (option c).

Explanation

The portal venous phase is optimal for liver lesion evaluation because, during this phase, the liver receives a significant amount of blood from the portal vein, which enhances the vascularity of liver lesions. This increased perfusion allows for better distinction between various types of lesions, such as hemangiomas, focal nodular hyperplasia, and hepatocellular carcinoma. Additionally, the contrast between the enhanced vascular lesions and the surrounding liver tissue improves visibility, facilitating a more accurate assessment. Other phases (pre-contrast, delayed, and arterial) may provide useful information but do not enhance liver lesions as effectively as the portal venous phase does.