title: Factors affecting patient movement and re-exposure in cone beam computed tomography examination.
abstract: OBJECTIVE
  To assess operator-, examination-, and patient-related factors, affecting patient movement and re-exposure in cone beam computed tomography (CBCT) examination.
  
  
  METHODS
  The sample consisted of 248 CBCT examinations in 190 patients video-recorded during examination. Three observers scored the videos; the patient moved or did not move. Operator-, examination-, and patient-related factors were evaluated separately (chi-square test) and by multivariate regression analyses (patient movement and re-exposure as separate outcomes).
  
  
  RESULTS
  The prevalence of movement was 21%. Cotton roll stabilizing patient's jaws, CBCT unit touching patient's hair, and patient's age 15 years or greater were related to movement. Age 15 years or greater had a significant impact on movement (P < .001; odds ratio [OR] 11.0). There were 16 re-exposures (6.4%). Age 15 years or greater, presence of a cotton roll, and field of view (FOV) were related to re-exposure. Use of a large FOV had significant impact on re-exposure (P = .04; OR 5.8).
  
  
  CONCLUSIONS
  Operator-, examination-, and patient-related factors may affect patient movement and re-exposure in CBCT examination.
authors.affiliation: Oral Radiology, Department of Dentistry, Aarhus University, Aarhus, Denmark. Electronic address: Rsn@odont.au.dk.
authors.forename: Rubens
authors.initials: R
authors.lastname: Spin-Neto
authors.affiliation: Oral Radiology, Department of Dentistry, Aarhus University, Aarhus, Denmark.
authors.forename: Louise Hauge
authors.initials: LH
authors.lastname: Matzen
authors.affiliation: Oral Radiology, Department of Dentistry, Aarhus University, Aarhus, Denmark.
authors.forename: Lars
authors.initials: L
authors.lastname: Schropp
authors.affiliation: Oral Radiology, Department of Dentistry, Aarhus University, Aarhus, Denmark.
authors.forename: Erik
authors.initials: E
authors.lastname: Gotfredsen
authors.affiliation: Oral Radiology, Department of Dentistry, Aarhus University, Aarhus, Denmark.
authors.forename: Ann
authors.initials: A
authors.lastname: Wenzel
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D056888:Patient Positioning; D011859:Radiography; D019233:Retreatment; D012307:Risk Factors; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*; D014741:Video Recording