What is the primary purpose of using collimation in radiographic imaging?

Collimation in radiographic imaging primarily serves to limit the size and shape of the X-ray beam that reaches the patient and the film or detector. By doing so, it significantly reduces unnecessary exposure to radiation for patients, sealing off areas that do not need imaging. This focused application of X-rays not only safeguards the patient by minimizing their overall exposure but also reduces the scatter radiation, which can degrade the quality of the images.

Moreover, while collimation can indirectly impact other factors like image contrast and sharpness by reducing scatter, its primary intention is to protect the patient from excess radiation exposure rather than enhancing the characteristics of the radiographic image itself. In summary, the core purpose of collimation is centered around patient safety through the reduction of radiation exposure.