Which statement about filtration is correct?

Which statement about filtration is correct?

• A. Decreases receptor exposure
• B. Increases receptor exposure
• C. No change in receptor exposure
• D. Unpredictable change in receptor exposure

Answer: (A)

Filtration works by absorbing the lower-energy photons in the x-ray beam. Those low-energy photons would contribute little to image formation but add to patient dose, and many of them would not reach the image receptor effectively. By removing them, the beam that reaches the receptor has fewer photons, so receptor exposure decreases. In practice, this reduction means you’d need to increase exposure factors to maintain the same receptor exposure after filtration, but that would also increase patient dose. Thus, filtration decreases receptor exposure.

Filtration works by absorbing the lower-energy photons in the x-ray beam. Those low-energy photons would contribute little to image formation but add to patient dose, and many of them would not reach the image receptor effectively. By removing them, the beam that reaches the receptor has fewer photons, so receptor exposure decreases. In practice, this reduction means you’d need to increase exposure factors to maintain the same receptor exposure after filtration, but that would also increase patient dose. Thus, filtration decreases receptor exposure.