What are the 3 controls on the x-ray machine?

What are the 3 controls on the x-ray machine?

• A. kVp, mA, time
• B. kVp, mAs, distance
• C. kVp, mA, distance
• D. mA, time, distance

Answer: (A)

The exposure parameters that you adjust on an x-ray machine fall into three controls that shape the beam and the exposure: beam energy, beam quantity, and how long the exposure lasts. Kilovoltage peak sets the energy of the photons, which determines how well the beam penetrates and influences image contrast. Higher kVp means more penetrating photons and generally lower contrast, while lower kVp increases contrast but reduces penetration. Milliamperes controls the tube current, which directly affects how many photons are produced—more current yields a brighter image. Exposure time tells you how long the tube is energized; when you multiply the tube current by the time, you get mAs, the total exposure delivered to the image receptor. Distance between the tube and the image receptor matters for beam intensity via the inverse-square law, but it’s more about positioning and geometry than a primary console control for setting exposure factors. So the three main machine controls you adjust to set up an standard exposure are kVp, mA, and time.

The exposure parameters that you adjust on an x-ray machine fall into three controls that shape the beam and the exposure: beam energy, beam quantity, and how long the exposure lasts. Kilovoltage peak sets the energy of the photons, which determines how well the beam penetrates and influences image contrast. Higher kVp means more penetrating photons and generally lower contrast, while lower kVp increases contrast but reduces penetration. Milliamperes controls the tube current, which directly affects how many photons are produced—more current yields a brighter image. Exposure time tells you how long the tube is energized; when you multiply the tube current by the time, you get mAs, the total exposure delivered to the image receptor.

Distance between the tube and the image receptor matters for beam intensity via the inverse-square law, but it’s more about positioning and geometry than a primary console control for setting exposure factors. So the three main machine controls you adjust to set up an standard exposure are kVp, mA, and time.