title: The effective dose of different scanning protocols using the Sirona GALILEOS(®) comfort CBCT scanner.
abstract: OBJECTIVE
  To determine the effective dose and CT dose index (CTDI) for a range of imaging protocols using the Sirona GALILEOS(®) Comfort CBCT scanner (Sirona Dental Systems GmbH, Bensheim, Germany).
  
  
  METHODS
  Calibrated optically stimulated luminescence dosemeters were placed at 26 sites in the head and neck of a modified RANDO(®) phantom (The Phantom Laboratory, Greenwich, NY). Effective dose was calculated for 12 different scanning protocols. CTDI measurements were also performed to determine the dose-length product (DLP) and the ratio of effective dose to DLP for each scanning protocol.
  
  
  RESULTS
  The effective dose for a full maxillomandibular scan at 42 mAs was 102 ± 1 μSv and remained unchanged with varying contrast and resolution settings. This compares with 71 μSv for a maxillary scan and 76 μSv for a mandibular scan with identical milliampere-seconds (mAs) at high contrast and resolution settings.
  
  
  CONCLUSIONS
  Changes to mAs and beam collimation have a significant influence on effective dose. Effective dose and DLP vary linearly with mAs. A collimated maxillary or mandibular scan decreases effective dose by approximately 29% and 24%, respectively, as compared with a full maxillomandibular scan. Changes to contrast and resolution settings have little influence on effective dose. This study provides data for setting individualized patient exposure protocols to minimize patient dose from ionizing radiation used for diagnostic or treatment planning tasks in dentistry.
authors.affiliation: 1 Division of Graduate Orthodontics, Schulich School of Medicine & Dentistry, Western University, London, ON, Canada.
authors.forename: D
authors.initials: D
authors.lastname: Chambers
authors.forename: R
authors.initials: R
authors.lastname: Bohay
authors.forename: L
authors.initials: L
authors.lastname: Kaci
authors.forename: R
authors.initials: R
authors.lastname: Barnett
authors.forename: J
authors.initials: J
authors.lastname: Battista
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000295:instrumentation*; D006257:Head / Q000528:radiation effects; D006801:Humans; D009333:Neck / Q000528:radiation effects; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D013819:Thermoluminescent Dosimetry
keywords: X-ray computed; cone beam computed tomography; optically stimulated luminescence dosimetry; radiation dosage; radiometry; tomography