Filtration has little effect on receptor exposure because x-rays removed from beam are not image-producing rays.

• A. True
• B. False
• C. Sometimes
• D. Never

Answer: (A)

Low-energy photons in the beam are not useful for forming an image because they are absorbed by the patient before they can reach the image receptor. Filtration removes these photons, which lowers the patient dose and improves beam quality, but it does not significantly reduce the photons that actually contribute to the image formed at the receptor. In other words, the photons that matter for receptor exposure are those that pass through the patient and reach the receptor, and filtration has little impact on how many of those make it. That’s why this statement is correct: filtration mainly reduces dose from non-image-producing photons and leaves receptor exposure largely unchanged.