title: Accuracy of linear measurement in the Galileos cone beam computed tomography under simulated clinical conditions.
abstract: OBJECTIVE
  The aim of this study was to determine the geometric accuracy of cone beam CT (CBCT)-based linear measurements of bone height obtained with the Galileos CBCT (Sirona Dental Systems Inc., Bensheim, Hessen, Germany) in the presence of soft tissues.
  
  
  METHODS
  Six embalmed cadaver heads were imaged with the Galileos CBCT unit subsequent to placement of radiopaque fiduciary markers over the buccal and lingual cortical plates. Electronic linear measurements of bone height were obtained using the Sirona software. Physical measurements were obtained with digital calipers at the same location. This distance was compared on all six specimens bilaterally to determine accuracy of the image measurements.
  
  
  RESULTS
  The findings showed no statistically significant difference between the imaging and physical measurements (P > 0.05) as determined by a paired sample t-test. The intraclass correlation was used to measure the intrarater reliability of repeated measures and there was no statistically significant difference between measurements performed at the same location (P > 0.05).
  
  
  CONCLUSIONS
  The Galileos CBCT image-based linear measurement between anatomical structures within the mandible in the presence of soft tissues is sufficiently accurate for clinical use.
authors.affiliation: Oral and Maxillofacial Radiology, General Dentistry, Tufts University School of Dental Medicine, Boston, MA, USA. rumpa.ganguly@tufts.edu
authors.forename: R
authors.initials: R
authors.lastname: Ganguly
authors.forename: A
authors.initials: A
authors.lastname: Ruprecht
authors.forename: S
authors.initials: S
authors.lastname: Vincent
authors.forename: J
authors.initials: J
authors.lastname: Hellstein
authors.forename: S
authors.initials: S
authors.lastname: Timmons
authors.forename: F
authors.initials: F
authors.lastname: Qian
mesh_terms: D000539:Alveolar Process / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D002102:Cadaver; D054893:Cone-Beam Computed Tomography; D057918:Fiducial Markers; D006801:Humans; D008334:Mandible / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D011857:Radiographic Image Interpretation, Computer-Assisted; D012984:Software