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When imaging a hyposthenic patient with an AEC (Automatic Exposure Control) system, the decrease in exposure time is primarily due to the way the AEC operates in response to the patient's body habitus. The AEC system is designed to terminate the exposure once a sufficient amount of radiation has reached the image receptor, allowing for optimal exposure to be achieved based on the specific body composition being imaged.

Hyposthenic patients, who generally have a slender build, may require shorter exposure times because the AEC system can quickly detect the lower levels of radiation needed to adequately expose the receptor for an effective image. As the system responds to the actual conditions presented by the patient's anatomy, it adjusts parameters like exposure time to provide the best possible image without overexposing or underexposing.

This decrease in exposure time ensures that the image produced is clear and diagnostic without additional delays, which is particularly important in maintaining patient comfort and safety during the imaging procedure. Consequently, the ability of the AEC system to automatically adjust for the specific body type enhances the efficiency of the imaging process.