If the milliampere-seconds (mAs) is doubled, what will happen to the dose to the patient?

When the milliampere-seconds (mAs) is doubled, the dose to the patient will also double. The mAs is a measure of the total quantity of x-rays produced during an exposure. It is calculated by multiplying the tube current (in milliamperes) by the exposure time (in seconds). Therefore, increasing the mAs means that either the current, the exposure time, or both have been increased, which results in a higher number of x-ray photons being generated.

In radiography, the amount of radiation the patient receives during an imaging procedure is directly proportional to the mAs. Hence, if the mAs is increased—such as doubling the original value—the resultant radiation dose absorbed by the patient will also increase proportionately to that change. This relationship is critical for understanding radiation safety and the optimization of imaging protocols in practice.