Define the term "contrast medium" in imaging.

The term "contrast medium" refers to a liquid or gas that is administered to a patient to enhance the visibility of internal structures during imaging procedures, such as X-rays, CT scans, or MRIs. The primary function of a contrast medium is to improve the contrast between different tissues or organs, thereby allowing for clearer and more detailed images. For example, when a contrast agent is used, it can help delineate blood vessels from surrounding tissues, making it easier to identify abnormalities or disease processes.

In various imaging techniques, the addition of a contrast medium can significantly improve diagnostic capabilities. It allows radiologists to better visualize areas that are typically difficult to see clearly, such as soft tissues or organs that may otherwise blend into one another on imaging scans.

This understanding underscores the critical role that contrast media play in the field of medical imaging, as they enhance the overall quality of the diagnostic process.