cone beam computerized tomography mamita
TRANSCRIPT
Cone Beam Computerized Tomography
Mamita SakhakarmiB.Sc.MIT (2nd year)4th Batch
Cone Beam Computerized Tomography
Pencil beam Fan beamCone beam
History1982, developed for angiography and subsequently applied to maxillofacial imaging.
Cone BeamA divergent or cone-shaped source of ionizing radiation and 2D area detector fixed on a rotating gantry to acquire multiple sequential projection images in one complete scan around ROI.
Principle2D digital array combined with a 3D x-ray beam with circular collimation so that is in the shape of a cone hence called the name cone beam.
Image acquisitionX-ray generation Image detection system Image reconstructionImage display
Flat Panel Detector
UsePathologic conditions and structural maxillofacial deformity.Preoperative assessment of orthodonticsAssessment of available bone for implantation.Treatment planning Trauma evaluation
AdvantagesShorter examination time Reduced image unsharpnessIncrease tube efficiency Great improvement in data acquisition efficiencyHigh SNR
Radiation dosesCBCT 36.3SvComplete mouth series 33SvPanoramic radiography 711SvConventional tomography 580-1202SvComputed tomography 480-3324Sv
CBCT artifactsAcquisition artifactsPatient related artifacts Scanner related artifacts Cone beam related artifacts
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