Final answer:
Fluoroscopic television systems are closed-circuit television systems that use fiber optics to provide live internal images for medical diagnostics and procedures.
Step-by-step explanation:
Fluoroscopic television systems are closed-circuit television systems used in medical settings to provide live images of the internal structures of a patient's body during diagnostics or surgical procedures. These systems utilize fiber optics, which enable the transmission of light and images through thin fibers of plastic or glass, based on the principle of total internal reflection. Fiber optics have become an invaluable tool in medicine, revolutionizing surgical techniques and enabling microsurgery and remote surgery with minimal invasiveness. The use of fiber optics in fluoroscopic systems allows for flexible navigation through small and difficult-to-reach parts of the body and can also deliver light for therapeutic purposes, such as activating chemotherapy drugs or burning away obstructing plaques in arteries.