What is the function of added filtration in an x-ray tube?

The function of added filtration in an x-ray tube is primarily to reduce the patient's dose of radiation. Filtration is the process of selectively absorbing low-energy x-ray photons that do not contribute to image formation and could instead increase the exposure to the patient. By removing these less penetrating photons, which would only add to the patient's radiation dose without improving image quality, added filtration helps ensure that the x-rays that reach the patient are those that are more likely to contribute to diagnostic information.

This approach is aligned with the principles of radiation safety and image optimization, as it not only minimizes the unnecessary radiation exposure for patients but also enhances the overall quality of the x-ray images by increasing the average energy of the x-ray beam that interacts with the patient. Hence, the correct answer highlights the role of added filtration in improving safety and efficiency in radiographic practices.