X-ray tube current is the current flowing through the X-ray tube. Thermo electrons generated by the X-ray tube filament collide with the anode, resulting in an electric current. The total intensity of the X-rays is proportional to the X-ray tube current. Increasing the X-ray tube current increases the x-ray dose. However, the shortest wavelength (maximum energy) remains the same. The filament current (filament temperature) controls the X-ray tube current.
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