ASRT Practice Exam 2025 – Complete Study Resource

The term "contrast media" specifically refers to substances that are administered to patients to enhance the visibility of internal structures during imaging procedures. These substances help to distinguish between different types of tissues and fluids, thereby improving the diagnostic quality of the images obtained from techniques such as X-rays, CT scans, and MRIs. Contrast media can be used to delineate blood vessels, organs, and other structures that may not be clearly visible under standard imaging conditions.

The use of contrast media is particularly important in procedures where distinguishing between similar densities within the body is critical for accurate diagnosis. For instance, iodine-based contrast agents are commonly used in X-ray and CT imaging, while gadolinium is often used in MR imaging. By enhancing the differentiation of anatomical structures, contrast media play a crucial role in facilitating better and more accurate assessments in medical imaging.