Select the Statement That Correctly Describes the Mechanism of Action

Select the statement that correctly describes the mechanism of action of contrast media.

A) Contrast media are used to enhance visualization of anatomic structures by influencing tissue radiopacity with different concentrations of iodine.
B) A contrast agent works by attenuating (absorbing) the x-ray beam either more than or less than the surrounding tissue.
C) Contrast media radiopacity is related to its iodine concentration.
D) A contrast agent works by the speed of delivery affecting blood flow and hemodilution.

Correct Answer:

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