Which cone characteristic correctly describes minimizing scatter radiation and beam divergence?

• A. Long-Open-Ended, Lead-Lined Cone
• B. Short, Closed Cone
• C. Open-Ended Aluminum Cone
• D. No Cone

Answer: (C)

Controlling scatter and beam divergence depends on shaping the beam and filtering out the parts of the spectrum that don’t contribute to the image but increase dose. An open-ended cone made of aluminum provides that balance: the aluminum acts as a filter to remove low-energy photons that would contribute to patient dose and scatter, while still letting the useful, higher-energy photons reach the image receptor. The open-ended design prevents extra absorption at the tip and helps keep the central ray aligned with the receptor, reducing the beam’s tendency to diverge beyond the intended field. This combination yields a more tightly collimated beam with less scatter than designs that rely on heavier, lead-lined materials or closed-ended cones, and it avoids the increased divergence you’d get without any cone at all.