Which automatic exposure control (AEC) detector selection would result in an appropriate exposure for an anteroposterior (AP) projection of the lumbar spine?

Selecting the correct automatic exposure control (AEC) detector is crucial for achieving an appropriate exposure for the anteroposterior (AP) projection of the lumbar spine. The lumbar spine is best examined by placing the central ray perpendicular to the mid-sagittal plane, which ideally aligns with the center of the vertebral column.

Using the center detector only ensures that the exposure is based on the amount of radiation transmitted through the region of interest, providing a consistent and accurate exposure level. This detector is designed to effectively measure the radiation that passes through the area of the lumbar spine, allowing for optimal image quality without overexposing or underexposing the film.

Activating all detectors may lead to exposure values that do not accurately represent the central area being examined, as other surrounding tissues could influence the readings. Meanwhile, limiting the activation to only one side (right or left) might not adequately cover the central portion of the lumbar spine, potentially resulting in suboptimal imaging.

Therefore, the choice to utilize only the center detector is aligned with best practices in radiography for ensuring high-quality imaging of the lumbar spine.