Milli-Ampere (mA) is an x-ray unit of electrical current. In x-ray machine operation it refers to the current supplied to the cathode of the x-ray tube and is linearly related to x-ray intensity produced. [1]The kVp determines the maximum x-ray energy that will be produced and the spectrum of x-ray energies produced. mA is commonly thought of as "gas in a car" or how much of the electrons will strike the target materiel (rotating anode).


  1. Conference of Radiation Control Program Directors, Inc. "COMPUTED RADIOGRAPHY (CR) AND DIGITAL RADIOGRAPHY (DR) STATE X-RAY INSPECTION PROTOCOL--Publication No. E-10-2 " Jan 2010.