Final answer:
The typical scan delay after the initiation of injection of contrast media for studies of the liver is 2) 70-80 seconds.
Step-by-step explanation:
The contrast media is injected intravenously, and it takes some time for it to circulate through the blood vessels and reach the liver. The delay allows for the contrast media to reach the liver and enhance the visibility of the liver structures during the scan.
A delay of 70-80 seconds is considered optimal because it allows for adequate contrast enhancement without excessive waiting time. If the scan is performed too early, the contrast may not have reached the liver yet, resulting in suboptimal images. On the other hand, if the scan is performed too late, the initial phase of contrast enhancement may have passed, making it more difficult to detect certain liver abnormalities.
In conclusion, the typical scan delay after the initiation of injection of contrast media for studies of the liver is 70-80 seconds. This allows for optimal visualization of the liver structures and improves the diagnostic accuracy of the scan. The correct answer is 2) 70-80 seconds