What is a contrast medium used for in radiology?

A contrast medium is utilized in radiology primarily to enhance the visibility of internal structures during imaging procedures. This enhancement allows for better differentiation of various tissues and organs, making it easier for radiologists to identify abnormalities or conditions. Contrast materials are designed to absorb or alter the passage of X-rays, thereby creating a clearer image of specific areas of the body, such as blood vessels or the gastrointestinal tract.

When assessing the other options, reducing radiation exposure does not relate to the intrinsic purpose of contrast media; rather, it involves optimizing imaging techniques and protocols. Improving patient comfort is important in radiological procedures but is not the primary function of contrast agents. Additionally, while speed of image capture can be a benefit of certain technological advancements in imaging, it does not pertain to the role of contrast mediums. Therefore, enhancing visibility is the main reason contrast materials are used.