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The primary function of "post-patient" collimation in CT imaging is to help prevent scatter radiation from reaching the detector. This collimation occurs after the X-ray beam passes through the patient, playing a vital role in enhancing image quality. When scatter radiation is allowed to reach the detector, it can degrade the signal, resulting in lower image quality and diagnostic efficacy. By minimizing the amount of scatter radiation that reaches the detector, post-patient collimation improves the clarity and accuracy of the images obtained, making it an essential aspect of the CT imaging process.

Other options, while related to the imaging process, do not accurately capture the specific role of post-patient collimation. For instance, focusing the X-ray beam occurs at the pre-patient stage, and improving patient safety is typically addressed through various protocols and practices rather than through collimation itself. Reducing the size of the image captured might be influenced by collimation but is not the primary function of post-patient collimation, which is fundamentally concerned with controlling scatter radiation.