a measure of the electric current flowing through a circuit or device, expressed in milliamperes. In X-ray imaging, it refers to the current between the cathode and anode of an X ray tube. The X-ray tube current is proportional to the number of electrons per unit time arriving at the X-ray tube target. Therefore, for a given kilovolt peak kVp , the tube current is directly proportional to the number of X-ray photons produced.
NP
