Fluoroscopy is most often used With contrast agents (eg, in swallowing studies or coronary artery catheterization) During medical procedures to guide placement of a cardiac lead, catheter, or needle (eg, in electrophysiologic testing or percutaneous coronary interventions) Fluoroscopy can also be used in real time to detect motion of the diaphragm and of bones and joints (eg, to assess the stability of musculoskeletal injuries).