What is the purpose of contrast agents in radiology?

The purpose of contrast agents in radiology is to enhance the visibility of specific structures or fluids in imaging studies. Contrast agents work by altering the way that different tissues in the body absorb or reflect imaging signals, which makes certain areas more distinct on the images produced. For example, in X-rays or CT scans, iodine-based contrast agents can be used to highlight blood vessels, organs, and certain types of lesions, allowing for a more detailed and accurate diagnosis.

This enhanced visibility helps radiologists to better differentiate between healthy and abnormal tissues, improving the overall diagnostic capability of the imaging study. The use of contrast agents is critical in various examinations, such as angiography or MRI, where specific structures must be clearly identified to assist in accurate assessment and treatment planning. The effectiveness of contrast agents in providing clearer images is what makes option A the key purpose of their use in radiology.