Which parameter is directly impacted by the use of automatic exposure control (AEC) during a radiographic exam?

• A. Image contrast
• B. Radiation dose
• C. Beam filtration
• D. Exposure time

Answer: (B)

Automatic exposure control is designed to keep receptor exposure consistent by stopping the exposure once the detectors register a preset signal. Because the system adjusts how much radiation is delivered to achieve that target signal, the parameter it directly affects is the radiation dose to the patient. This helps standardize image receptor exposure across different patient sizes and positions, reducing unnecessary dose while maintaining image quality. Filtration and image contrast are governed by other factors like beam quality and receptor response, not by AEC. Exposure time can vary with AEC as the system may prolong or shorten the exposure to reach the desired detector signal, but the primary direct impact is on the dose.