In radiography, what is the function of collimation?

Collimation plays a crucial role in radiography by reducing scatter radiation, which is a primary reason for its implementation. Scatter radiation occurs when the x-ray beam interacts with matter and is deflected in different directions. This scattered radiation can contribute to image degradation by adding unwanted exposure to areas of the image, ultimately impacting diagnostic quality. By using collimation, the radiographer confines the x-ray beam to the area of interest, minimizing the amount of scatter radiation that reaches the image receptor. This leads to clearer, more defined images.

While collimation does help in enhancing image contrast indirectly by reducing scatter, its main function is specifically aimed at limiting scatter radiation. This focused approach not only improves the quality of the diagnostic images by enhancing their sharpness but also helps protect the patient and staff from unnecessary radiation exposure. Therefore, the choice emphasizing the reduction of scatter radiation directly aligns with the primary purpose of collimation in radiographic practices.