What is the time range for the delayed phase of hepatic contrast enhancement?

The delayed phase of hepatic contrast enhancement typically occurs within a time range of 5 to 20 minutes after the administration of contrast material. During this phase, the liver parenchyma enhances due to the uptake and retention of contrast in the hepatocytes, which occurs after initial vascular and arterial phase enhancements.

This time frame is essential for optimal imaging in protocols designed for evaluating hepatic lesions, as different pathologies may demonstrate varying enhancement characteristics at specific intervals post-contrast administration. This understanding assists radiologic technologists and radiologists in accurately interpreting the liver's appearance during imaging studies.

In clinical practice, knowing this time range aids in scheduling the CT imaging appropriately to capture the delayed phase where certain hepatobiliary conditions, such as tumors or cirrhosis, may be more clearly visualized.