Which of the following is a main component of a fluoroscopy system?

A fluoroscopy system primarily utilizes an X-ray tube to produce real-time imaging of the moving internal structures of the body. The X-ray tube generates high-energy X-rays when an electric current passes through it, allowing for continuous imaging during procedures. This capability is essential in dynamic studies, such as observing the movement of the gastrointestinal tract, guiding catheter placements, or assessing joint motions.

Other options include technologies that serve different purposes in medical imaging. An ultrasound probe uses sound waves to create images, a CT scanner provides detailed cross-sectional images using computed tomography, and an MRI machine utilizes magnetic fields and radio waves for imaging. However, none of these components are part of a fluoroscopy system, which specifically relies on the X-ray tube for its function.