What is the function of the collimator in a CT scanner?

The collimator in a CT scanner plays a crucial role in shaping and limiting the x-ray beam. Its primary function is to reduce scatter radiation, which can degrade image quality. By precisely directing the x-ray beam to the area of interest, the collimator ensures that only the necessary amount of radiation is utilized for imaging, thereby enhancing the clarity and resolution of the images produced. This reduction in scatter radiation contributes significantly to the overall accuracy of the diagnostic information gathered during a scan.

In contrast, other options do not accurately reflect the primary role of the collimator. While increasing the amount of radiation would not benefit image quality, enhancing patient comfort pertains to different aspects of CT design and does not involve the collimator's function. Immediate image processing is also not a function of the collimator but rather relates to the technical capabilities of the scanner's computer system. Thus, the correct choice emphasizes the collimator's vital role in improving the quality of CT imaging through effective beam management.