Most organs have exclusively arterial blood supply, and their peak enhancement is at how many seconds after injection?

The peak enhancement for most organs after the injection of contrast material typically occurs between 15 to 22 seconds. This timing is critical in computed tomography (CT) imaging, as it allows for optimal visualization of vascular structures and organ parenchyma, maximizing the contrast between the organs and surrounding tissues.

Understanding the time dynamics of contrast enhancement is essential for technologists when deciding on the timing of image acquisition following contrast administration. This range allows for adequate circulation time for the contrast to reach the organs, ensuring the images captured highlight the vascular structures while minimizing artifacts or missing critical anatomy that might occur if images are taken too early or too late after contrast injection.

The other time ranges do not accurately reflect the peak enhancement timing due to the rapid circulation and the hemodynamics of blood flow in the body, which influences how quickly and effectively contrast material enhances organ visibility.