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

The function of the X-ray tube filter in radiography is to provide a more homogeneous X-ray beam. Filters are used to remove low-energy X-rays from the beam before it reaches the object being examined. Low-energy X-rays contribute little to the image quality but increase patient exposure unnecessarily. By filtering out these lower-energy photons, the X-ray beam becomes more uniform in energy, which enhances the quality of the radiographic image and improves contrast. A homogeneous beam provides better penetration through the material being tested, leading to clearer and more reliable imaging results.