Which of the following are factors that directly influence the patient dose controlled by X-ray personnel?

• A. Proper collimation
• B. Correct use of primary factors (mA, kVp, exposure time, distance)
• C. Proper film handling and processing
• D. All of the above

Answer: (D)

Controlling patient dose comes from limiting the beam to only what’s needed, setting the exposure correctly, and ensuring the image is usable on the first try. Proper collimation shrinks the irradiated area to the anatomy of interest, which lowers the dose to surrounding tissues and reduces scatter that can degrade image quality. Using the correct primary factors—mA, kVp, exposure time, and distance—directly governs how much radiation the patient receives per exposure: the product of mA and time sets the photon output, distance follows the inverse square law so a greater gap reduces dose, and choosing appropriate kVp balances penetration and dose while maintaining sufficient image quality. Proper film handling and processing support dose control by reducing the need for repeats due to poor image quality; fewer repeats mean fewer additional exposures and less cumulative dose to the patient. When these elements work together, patient dose is kept as low as reasonably achievable without compromising diagnostic quality.