What is the purpose of a filter in x-ray machines?

The purpose of a filter in x-ray machines is to remove low-energy x-rays from the x-ray beam. These low-energy x-rays contribute to patient dose without providing any useful diagnostic information. By filtering out these less penetrating rays, the quality of the x-ray beam is improved, as it enhances the overall penetration power of the x-rays that do reach the film or sensor. This results in clearer images with better diagnostic value while also minimizing the unnecessary exposure of patients to radiation. Enhancing image quality through this process is crucial for accurate diagnoses in dental and other medical imaging fields.