What is the function of filter in X-ray tube head?

The filter in an X-ray tube head serves to remove low-energy X-ray photons from the beam that do not contribute to the diagnostic image but increase patient dose. By filtering out these less penetrating rays, the filter enhances the quality of the X-ray beam, ensuring that only higher-energy photons, which can penetrate tissues and produce clearer images, are allowed to reach the patient. This improves image quality and reduces unnecessary radiation exposure, making the procedure safer for patients.