Ultrasound contrast agents are specialized substances used during ultrasound imaging to enhance the visibility of blood vessels and organs. These agents typically consist of microbubbles filled with gas, which reflect ultrasound waves more effectively than surrounding tissues. This improved contrast helps healthcare providers obtain clearer images, aiding in the diagnosis of various medical conditions. When injected into the bloodstream, ultrasound contrast agents circulate and can highlight areas of interest, such as tumors or areas of reduced blood flow. They are particularly useful in cardiac imaging and vascular studies, providing valuable information without exposing patients to radiation.