Which statement best describes the dose-reducing technique chart guidance?

• A. High kVp and high mAs
• B. Low kVp and low mAs
• C. High kVp and low mAs
• D. Low kVp and high mAs

Answer: (C)

Dose reduction comes from optimizing technique by using higher kilovoltage and lowering the milliampere-seconds, so the image still meets visibility needs without delivering unnecessary dose. Raising kVp makes the beam more penetrating, which means fewer photons are needed to achieve adequate receptor exposure. Lowering mAs directly reduces the number of photons produced, cutting the patient's radiation dose. The higher kVp also shifts the interaction toward Compton events, which helps keep dose down while maintaining enough penetration for the detector.

Keep in mind that increasing kVp lowers image contrast, so this approach is chosen when the diagnostic task can tolerate a longer grayscale and is balanced with proper filtration and grids to preserve overall image quality. In contrast, using low kVp with high mAs would generally expose the patient to more radiation, and high kVp with high mAs would not maximize dose reduction.