What is the primary purpose of using a collimator in radiography?

The primary purpose of using a collimator in radiography is to reduce the patient dose. A collimator functions by limiting the size and shape of the x-ray beam that exits the imaging system. By restricting the area exposed to radiation, it minimizes the amount of scatter radiation and reduces unnecessary exposure to surrounding tissues. This not only protects the patient from excessive radiation but also helps to concentrate the radiation on the area of interest, improving the quality of the diagnostic information obtained.

The other options target various aspects of imaging but are not the primary function of a collimator. For example, while a collimator may indirectly contribute to factors such as image resolution by reducing scatter, its main design consideration is radiation dose management. The role of a collimator is essential in prioritizing patient safety while ensuring effective imaging outcomes.