Which statement about cone-beam computed tomography (CBCT) in dentistry is true?

Which statement about cone-beam computed tomography (CBCT) in dentistry is true?

• A. It provides 3D imaging and may involve higher radiation dose than 2D radiographs
• B. It uses magnetic resonance
• C. It replaces all 2D radiographs
• D. It exposes no radiation

Answer: (A)

CBCT gives true three-dimensional imaging by capturing a volumetric dataset with a cone-shaped X-ray beam, allowing you to view anatomy in multiple planes and in 3D reconstructions. Because it uses X-rays to obtain that volume, it involves radiation exposure. In practice, the dose from CBCT is generally higher than that of a single 2D intraoral radiograph, though the exact amount depends on factors like the field of view, voxel size, and exposure settings. This is why clinicians use the smallest necessary field of view and lowest acceptable resolution to minimize dose while still obtaining the needed diagnostic information. CBCT does not use magnetic resonance, does not replace all 2D radiographs, and certainly does not expose the patient to zero radiation.

CBCT gives true three-dimensional imaging by capturing a volumetric dataset with a cone-shaped X-ray beam, allowing you to view anatomy in multiple planes and in 3D reconstructions. Because it uses X-rays to obtain that volume, it involves radiation exposure. In practice, the dose from CBCT is generally higher than that of a single 2D intraoral radiograph, though the exact amount depends on factors like the field of view, voxel size, and exposure settings. This is why clinicians use the smallest necessary field of view and lowest acceptable resolution to minimize dose while still obtaining the needed diagnostic information. CBCT does not use magnetic resonance, does not replace all 2D radiographs, and certainly does not expose the patient to zero radiation.