What is the primary function of the x-ray tube?

The primary function of the x-ray tube is to serve as a source of x-rays. The x-ray tube generates x-rays through a process called "bremsstrahlung" and characteristic radiation, which occurs when high-speed electrons collide with a metal target inside the tube. This interaction produces the x-rays that are necessary for imaging.

The design of the x-ray tube allows for the controlled emission of these rays, which are then directed toward the patient. As x-rays pass through the body, they are either absorbed or transmitted depending on the density of the tissues, creating a contrast that is captured on radiographic film or a digital detector to form an image.

Options related to image processing, radiation protection, and patient positioning address important aspects of radiology practice but do not define the fundamental purpose of the x-ray tube itself, which is specifically to produce x-rays.