title: Two examples of indication specific radiation dose calculations in dental CBCT and Multidetector CT scanners.
abstract: OBJECTIVE
  To calculate organ doses and estimate the effective dose for justification purposes in patients undergoing orthognathic treatment planning purposes and temporal bone imaging in dental cone beam CT (CBCT) and Multidetector CT (MDCT) scanners.
  
  
  METHODS
  The radiation dose to the ICRP reference male voxel phantom was calculated for dedicated orthognathic treatment planning acquisitions via Monte Carlo simulations in two dental CBCT scanners, Promax 3D Max (Planmeca, FI) and NewTom VGi evo (QR s.r.l, IT) and in Somatom Definition Flash (Siemens, DE) MDCT scanner. For temporal bone imaging, radiation doses were calculated via MC simulations for a CBCT protocol in NewTom 5G (QR s.r.l, IT) and with the use of a software tool (CT-expo) for Somatom Force (Siemens, DE). All procedures had been optimized at the acceptance tests of the devices.
  
  
  RESULTS
  For orthognathic protocols, dental CBCT scanners deliver lower doses compared to MDCT scanners. The estimated effective dose (ED) was 0.32mSv for a normal resolution operation mode in Promax 3D Max, 0.27mSv in VGi-evo and 1.18mSv in the Somatom Definition Flash. For temporal bone protocols, the Somatom Force resulted in an estimated ED of 0.28mSv while for NewTom 5G the ED was 0.31 and 0.22mSv for monolateral and bilateral imaging respectively.
  
  
  CONCLUSIONS
  Two clinical exams which are carried out with both a CBCT or a MDCT scanner were compared in terms of radiation dose. Dental CBCT scanners deliver lower doses for orthognathic patients whereas for temporal bone procedures the doses were similar.
authors.affiliation: Katholieke Universiteit Leuven, Department of Imaging and Pathology, OMFS-IMPATH Research Group, Campus St. Rafael, Kapucijnenvoer 33, Leuven 3000, Belgium. Electronic address: andreas.stratis@uzleuven.be.
authors.forename: Andreas
authors.initials: A
authors.lastname: Stratis
authors.affiliation: University Hospitals of Leuven, Department of Radiology, Herestraat 49, Leuven 3000, Belgium.
authors.forename: Guozhi
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Katholieke Universiteit Leuven, Department of Imaging and Pathology, OMFS-IMPATH Research Group, Campus St. Rafael, Kapucijnenvoer 33, Leuven 3000, Belgium.
authors.forename: Xochitl
authors.initials: X
authors.lastname: Lopez-Rendon
authors.affiliation: Katholieke Universiteit Leuven, Department of Imaging and Pathology, OMFS-IMPATH Research Group, Campus St. Rafael, Kapucijnenvoer 33, Leuven 3000, Belgium.
authors.forename: Constantinus
authors.initials: C
authors.lastname: Politis
authors.affiliation: University Hospitals of Leuven, Department of Radiology, Herestraat 49, Leuven 3000, Belgium.
authors.forename: Robert
authors.initials: R
authors.lastname: Hermans
authors.affiliation: Katholieke Universiteit Leuven, Department of Imaging and Pathology, OMFS-IMPATH Research Group, Campus St. Rafael, Kapucijnenvoer 33, Leuven 3000, Belgium.
authors.forename: Reinhilde
authors.initials: R
authors.lastname: Jacobs
authors.affiliation: University Hospitals of Leuven, Department of Radiology, Herestraat 49, Leuven 3000, Belgium.
authors.forename: Ria
authors.initials: R
authors.lastname: Bogaerts
authors.affiliation: Katholieke Universiteit Leuven, Department of Imaging and Pathology, OMFS-IMPATH Research Group, Campus St. Rafael, Kapucijnenvoer 33, Leuven 3000, Belgium.
authors.forename: Eman
authors.initials: E
authors.lastname: Shaheen
authors.affiliation: University Hospitals of Leuven, Department of Radiology, Herestraat 49, Leuven 3000, Belgium.
authors.forename: Hilde
authors.initials: H
authors.lastname: Bosmans
mesh_terms: D054893:Cone-Beam Computed Tomography; D006801:Humans; D008297:Male; D009010:Monte Carlo Method; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011861:Radiography, Dental; D013701:Temporal Bone / Q000000981:diagnostic imaging; D015898:Tomography Scanners, X-Ray Computed
keywords: Dental CBCT; MDCT; Orthognathic surgery; Temporal bone imaging