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What is Cone-Beam CT and How Does it Work?

What is Cone-Beam CTand How Does it Work? William C. Scarfe, BDS, FRACDS, MSa,*,Allan G. Farman, BDS, PhD, DSc, MBAbaDepartment of Surgical/Hospital Dentistry, University of Louisville Schoolof Dentistry, Room 222G, 501 South Preston Street, Louisville, KY 40292, USAbDepartment of Surgical/Hospital Dentistry, University of Louisville Schoolof Dentistry, Room 222C, 501 South Preston Street, Louisville, KY 40292, USAI maging is an important diagnostic adjunct to the clinical assessment ofthe dental patient. The introduction of panoramic radiography in the 1960sand its widespread adoption throughout the 1970s and 1980s heraldedmajor progress in dental radiology, providing clinicians with a single com-prehensive image of jaws and maxillofacial structures. However, intraoraland extraoral procedures, used individually or in combination, suffer fromthe same inherent limitations of all planar two-dimensional (2D) projec-tions: magnification, distortion, superimposition, and misrepresentation ofstructures.

Refinement of approximate cone-beam algorithms Reconstructing 3D objects from cone-beam projections is a fairly recent accomplishment. In conventional fan-beam CT, individual axial slices of

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