Which statement best describes a low-dose radiography approach?

• A. HIGH kVp and LOW mAs
• B. FASTEST film-screen combination
• C. LOW kVp and HIGH mAs
• D. FASTEST film-screen with HIGH kVp and LOW mAs

Answer: (A)

To reduce patient dose, adjust technique factors to use more penetrating X-rays but fewer photons overall. Raising the kilovoltage peak (kVp) increases the energy of the photons, so you can lower the milliamperage-second (mAs) and still achieve the same image receptor exposure. Since dose is largely driven by the number of photons produced (mAs), lowering mAs reduces the patient's radiation exposure, while the higher energy photons help maintain image receptor exposure. The trade-off is a decrease in image contrast, which is often acceptable or can be managed with detector speed and processing. While using a faster film-screen system can further help reduce dose by improving efficiency, the core description of a low-dose approach centers on using high kVp with low mAs.