Which of the following helps to reduce scatter radiation in radiology?

Beam restriction is the correct choice as it directly addresses the reduction of scatter radiation in radiology. Beam restriction involves limiting the size of the x-ray beam to more closely match the area of interest being imaged. By focusing the radiation on a smaller area, it minimizes the amount of tissue that the radiation passes through, thereby reducing the amount of scattered photons that can degrade image quality. This process not only enhances the quality of the images but also lowers the patient's exposure to unnecessary radiation and helps to protect nearby tissues.

In contrast, shielding refers to protective barriers that absorb stray radiation but does not inherently reduce the amount of scatter produced during the imaging process itself. Increasing radiation dose is counterproductive to reducing scatter and can increase patient exposure, while image enhancement techniques are used to improve the quality of images after they have been captured, but they do not mitigate the production of scatter radiation during the imaging procedure.