What is the purpose of filtration in the X-ray beam?

• A. To remove low-energy X-rays from the beam
• B. To help X-rays penetrate better
• C. To adjust the angle of the beam
• D. To change the color of the film

Answer: (A)

Filtration removes low-energy X-rays from the beam to harden it. Those soft photons are readily absorbed by superficial tissues and add dose without helping form a clearer image. By absorbing them (with materials like aluminum built into the tube assembly), the beam becomes more penetrating, which lowers patient skin dose and improves image quality because the remaining photons contribute more effectively to image formation. This doesn’t change the beam’s angle or the film color; it just changes which photons reach the patient and the receptor. Keep in mind that filtration reduces overall intensity, so exposure settings may need adjustment.