The density control function of an AEC unit allows for changes in radiation exposure of at least what percentage for each increment?

The density control function of an Automatic Exposure Control (AEC) unit is designed to allow radiologic technologists to adjust exposure levels based on the specific needs of a patient or imaging situation. The answer indicating 25% reflects the standard increment change typically utilized in AEC systems, allowing for precise adjustments in radiation exposure. This capability ensures that the resulting images maintain optimal density without increasing exposure levels excessively, which is crucial for patient safety and image quality.

Using 25% increments allows for finer control over the exposure parameters, accommodating variations in patient body habitus or the specific imaging protocol. AEC systems utilize this feature to enable the operator to compensate for different clinical situations, thereby ensuring that the images produced meet the diagnostic requirements without unnecessary radiation dose to the patient. The other percentages would imply either larger or less manageable adjustments, which could lead to challenges in achieving the necessary image quality consistently.