What is 5 percent kvp rule?

The 5 percent kVp rule is a guideline used in radiography to optimize image quality while minimizing patient exposure to radiation. It states that increasing the kilovolt peak (kVp) by 5 percent can effectively reduce the required exposure time by approximately 50 percent, leading to less radiation dose to the patient. This rule helps radiologic technologists balance the need for adequate image brightness and contrast with the imperative to keep radiation exposure as low as reasonably achievable (ALARA).