The X-ray Tube:X-ray tubes are found in a wide variety of imaging devices, Computed Tomography (CT), portable x-ray machines, mammography machines, fixed position x-ray machines, fluoroscopy units, and c-arm x-ray machines.
Medical x-rays are produced in a glass enclosed vacuum tube. A high voltage differential is applied across a gap in a vacuum tube between a cathode and an anode. The anode is the target for the electrons that are accelerated across the vacuum and the anode is usually made of a metal, often tungsten. When the voltage differential results in an electron crossing over the gap and impacting the metallic anode the electron slows down and liberates energy as heat and x-rays. The majority of the energy is liberated as heat. This type of interaction that results in x-ray generation, has been called by the “braking of the electron”, the bremsstrahlung effect.
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