What determines the maximum photon energy in an X-ray beam? The maximum photon energy in an X-ray beam is determined by the tube voltage (kVp) applied across the X-ray tube. The maximum possible energy of any photon produced cannot exceed…
What is characteristic radiation? Characteristic radiation is produced when an incoming high-energy electron ejects an inner-shell electron from a target atom, creating an electron vacancy. When an electron from a higher energy shell falls into this vacancy, the energy difference…
What is Bremsstrahlung radiation? Bremsstrahlung radiation is produced when a high-speed electron is decelerated or deflected by the electric field of an atomic nucleus. As the electron loses kinetic energy during this interaction, the lost energy is emitted as an…
How are X-rays produced in an X-ray tube? X-rays are produced when high-speed electrons emitted from the cathode are accelerated across a vacuum by a high voltage and strike a metal target at the anode. When these electrons interact with…
What limits X-ray tube output? X-ray tube output is primarily limited by heat loading of the anode. Because approximately 99% of the kinetic energy of electrons striking the anode is converted into heat rather than X-rays, excessive exposure parameters can…
What is the anode heel effect? The anode heel effect is the variation in X-ray beam intensity across the field due to absorption of photons within the angled anode target. Beam intensity is lower on the anode side and higher…
What is focal spot size and why does it matter? The focal spot is the area of the anode target that is struck by electrons and from which X-rays are emitted. The size of the effective focal spot determines the…
What is the line focus principle? The line focus principle is a design feature of the X-ray tube in which the anode target is angled so that the effective focal spot is smaller than the actual area struck by electrons.…
What is the function of the anode in an X-ray tube? The anode in an X-ray tube serves as the target for high-speed electrons emitted from the cathode. When these electrons strike the anode, their kinetic energy is converted into…
What is thermionic emission? Thermionic emission is the process by which electrons are released from a heated metal surface. In an X-ray tube, it occurs at the tungsten filament of the cathode when it is heated to a high temperature.…
