CBCT artifact is most commonly associated with metallic restorations?

CBCT artifact is most commonly associated with metallic restorations?

• A. Motion artifact.
• B. Beam hardening and streak artifacts.
• C. Ring artifact.
• D. Aliasing.

Answer: (B)

Metallic restorations in CBCT commonly cause beam hardening artifacts with associated streaks. The X-ray beam is polychromatic, and metal preferentially absorbs lower-energy photons, shifting the beam toward higher energies as it passes through the metal. This uneven attenuation around dense objects creates dark bands and bright streaks that radiate from the restoration and can obscure adjacent structures. Motion artifacts arise from patient movement and blur the image, ring artifacts come from detector calibration issues, and aliasing results from undersampling or reconstruction problems—not from metal specifically. So the characteristic beam-hardening streaks best explain artifacts seen with metallic restorations.

Metallic restorations in CBCT commonly cause beam hardening artifacts with associated streaks. The X-ray beam is polychromatic, and metal preferentially absorbs lower-energy photons, shifting the beam toward higher energies as it passes through the metal. This uneven attenuation around dense objects creates dark bands and bright streaks that radiate from the restoration and can obscure adjacent structures.

Motion artifacts arise from patient movement and blur the image, ring artifacts come from detector calibration issues, and aliasing results from undersampling or reconstruction problems—not from metal specifically. So the characteristic beam-hardening streaks best explain artifacts seen with metallic restorations.