Question

Which of the following is the order in which the phases of IV contrast enhancement occur?

a. bolus, equilibrium, non-equilibrium
b. equilibrium, non-equilibrium, bolus
c. bolus, non-equilibrium, equilibrium
d. non-equilibrium, equilibrium, bolus

Answer 1

The phases of IV contrast enhancement occur in the order of bolus phase, non-equilibrium phase, and finally, equilibrium phase, with each phase providing different levels of tissue contrast for imaging studies.

Step-by-step explanation:

The order in which the phases of IV contrast enhancement occur is:

1. Bolus phase
2. Non-equilibrium phase
3. Equilibrium phase

Different phases of contrast enhancement are crucial for various imaging studies, as they provide different levels of tissue contrast and enhancement which can be critical for identifying certain pathologies. The bolus phase is the initial phase where the contrast material is first injected and circulates rapidly. Next, the non-equilibrium or nephrographic phase occurs where the contrast becomes less concentrated as it starts to distribute evenly within the blood and interstitial spaces. Finally, the equilibrium phase is reached when the concentration of contrast medium is equal between the blood and the extravascular spaces, usually characterized by a homogenous enhancement of tissues.