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Although nothing can replace history and physical examination when evaluating patients, the use and evolution of non-invasive technology for imaging areas not visible to the human eye has become a bigger [01]part of the diagnostic process. Imaging is an important diagnostic adjunct to the clinical assessment of the dental patient. The introduction of panoramic radiography and its widespread adoption heralded major progress in dental radiology, However intraoral and extra oral procedures, used individually or in combination, suffer from the same inherent limitations of all planar two-dimensional projections: magnification, distortion, superimposition, and misrepresentation of structures. Numerous efforts have been made toward three-dimensional radiographic imaging and although CT has been available, its application in dentistry has been limited because of cost, access, and dose [