What is the function of adding filtration within the x-ray tube?

The correct focus for the function of adding filtration within the x-ray tube is to block low-energy photons from reaching the patient. Filtration is essential in radiography because it removes weak x-ray photons that do not contribute to the diagnostic image but instead increase the patient's radiation dose. By filtering out these low-energy photons, the overall quality of the x-ray beam is improved, leading to a more efficient and safer radiographic procedure.

Effective filtration enhances image quality indirectly by ensuring that only those x-rays that are capable of penetrating the body and contributing usefully to the image remain in the beam. This results in better contrast and detail in the images while minimizing unnecessary exposure to the patient. Therefore, the addition of filtration ultimately serves to protect the patient from excessive radiation while optimizing the conditions for obtaining quality images.