n. short for milliampere: one thousandth of an *ampere (10?3 A; symbol: mA). In radiography, the mA setting on an X-ray machine determines the number of X-ray photons produced per second. The setting is important to obtain appropriate exposure and varies with body size (among other factors). See also kilovolt.
n. one thousand *volts (symbol: kV). In radiography, the kilovoltage of the X-ray machine determines the maximum energy of the X-rays produced. The setting is important in controlling the exposure of the film and is generally higher when more penetration is required, depending on the thickness of the body part being imaged. See also milliamp.... kilovolt