What is the purpose of the tube housing in an X-ray tube?

• A. Provides shielding and mounting.
• B. Emits electrons.
• C. Filters beam.
• D. Rotates the anode.

Answer: (A)

Shielding and mounting are the tube housing's primary roles. The housing is a metal enclosure with shielding that limits leakage and scatter of X-rays, protecting the operator and patient. It also provides a sturdy mounting framework so the tube can be securely attached to the X-ray stand and precisely aligned with the collimator and patient. Inside, cooling and insulation are supported as the tube sits in oil that helps remove heat from the hot anode and cathode while maintaining the vacuum. The X-ray beam exits through a thin window in the housing designed to minimize attenuation. The other functions belong to different parts: electron emission comes from the filament in the cathode, filtration is done by dedicated beam filters, and the anode is rotated by its own rotor inside the tube.