Conebeam.com. A nice complete resource for learning more about cone beam.
Cone Beam Computed Tomography (CBCT) scanners have been available for craniofacial imaging since 1999 in Europe and more recently (2001) in the United States. The scanner uses a cone shaped x-ray beam rather than a conventional linear fan beam to provide images of the bony structures of the skull.
via CBCT | Conebeam.