Definition Of X Ray Tube Current

Therefore x radiation is created by taking the energy from the electrons and converting it into photons this very specific energy conversion takes place in the x ray.

Definition of x ray tube current. The hot cathode of an x ray tube is usually a spiral or straight filament of tungsten wire that is heated to a high temperature by an electric current. Some of the beams will pass through the object and some are absorbed. This spectrum can be manipulated by changing the x ray tube current or voltage settings or by adding filters to select out low energy x rays. 6 2 b this circuit is divided into two parts by the step down transformer 11 and 12 the primary purpose of the filament circuit is to supply a low current to heat the x ray tube filament for thermionic emission of electrons.

As a result of characteristic and bremsstrahlung radiation generation a spectrum of x ray energy is produced within the x ray beam. Heat is considered the undesirable product of this conversion process. You can complete the definition of x ray tube current given by the english definition dictionary with other english dictionaries. An x ray tube is a vacuum tube that converts electrical input power into x rays.

Tube current exposure time product mas 80 kv 16mas s 225 the image above shows a computed radiography image of a pelvis phantom that was generated using 80 kv and 16 mas and employing a scatter removal grid. The beam is projected on the object. The resulting pattern of radiation is detected in a photographic film as. The availability of this controllable source of x rays created the field of radiography the imaging of partly opaque objects with penetrating radiation in contrast to other sources of ionizing radiation x rays are only produced as long as the x ray tube is energized.

X ray machines work by applying controlled voltage and current to the x ray tube. The filament circuit is the subcircuit of the main x ray circuit shown as the lower portion of fig. Wikipedia lexilogos oxford cambridge chambers harrap wordreference collins lexibase dictionaries merriam webster. The wire penetrating the glass seals at the end of the tube is known as dumet wire a copper coated alloy of nickel and iron that has the same coefficient of expansion as the glass.

So the beam intensity of x rays can be controlled by controlling voltage or current. The type of x ray tube used most widely in all fields is the sealed off hot cathode tube with a water cooled anode and an electrostatic electron focusing system figure 1. The x ray window is a portion of the tube envelope which is thinner than the rest of the structure to allow x ray output from the tube minimising radiation absorption.