What is the main function of filters in x-ray machines?

The main function of filters in x-ray machines is to absorb low-energy photons. In diagnostic imaging, filters are used to remove these low-energy x-rays because they do not contribute to image formation and can increase the radiation dose to the patient without adding diagnostic value. By absorbing these lower-energy photons, filters help improve the quality of the x-ray image.

This process is known as beam hardening; it enhances the overall quality of the x-ray beam, ensuring that only the more penetrating, high-energy x-rays reach the imaging receptor. More effective imaging and reduced patient exposure to unnecessary radiation are significant benefits of using filters.