Increasing kVp primarily affects which aspects of the beam?

• A. Energy and penetrability
• B. Beam intensity
• C. Field size
• D. Exposure time

Answer: (A)

The main idea is that kVp sets the energy of the X-ray photons and how deeply they can penetrate matter. When you increase kVp, the photons in the beam gain higher energy, so they pass through tissues more easily. That higher energy and greater penetrability is exactly what kVp controls, more than anything else. Field size is determined by the collimator and geometry, while exposure time is set by the timer or exposure switch. Beam intensity (quantity) is mainly influenced by the tube current (mA) and exposure duration, not by kVp alone. So increasing kVp primarily changes the photons’ energy and their ability to penetrate, which is why that option is the best answer.