title: The reliability of "Analyze" software in measuring orbital volume utilizing CT-derived data.
abstract: BACKGROUND
  Craniomaxillofacial surgeons require to estimate the orbital volume in a variety of clinical situations. This paper evaluates a new method based on software analysis of computerized tomography (CT) scan data.
  
  
  METHODS
  Five dried skulls with prosthetic globes and periorbita were non-helically scanned in an Elscint 2400 CT scanner. Images obtained were processed using the "Analyze" software package and results compared to the volume of the intraorbital prosthesis as determined by a volume displacement gravimetric method.
  
  
  RESULTS
  Estimates of volume produced by the software varied from the gold standard by 0.06-50.44%, with a mean error of 8.8%.
  
  
  CONCLUSIONS
  Despite the use of a variety of scan protocols it was not possible to obtain results with "Analyze" software which were sufficiently accurate for clinical use.
authors.affiliation: West of Scotland Regional Maxillofacial Unit, Southern General Hospital, Glasgow, UK.
authors.forename: David Andrew
authors.initials: DA
authors.lastname: Koppel
authors.forename: Richard Hirsch
authors.initials: RH
authors.lastname: Foy
authors.forename: James Anthony
authors.initials: JA
authors.lastname: McCaul
authors.forename: Jane
authors.initials: J
authors.lastname: Logan
authors.forename: Donald Montague
authors.initials: DM
authors.lastname: Hadley
authors.forename: Ashraf
authors.initials: A
authors.lastname: Ayoub
mesh_terms: D005137:Eye, Artificial; D006801:Humans; D009915:Orbit / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D011474:Prosthesis Design; D015203:Reproducibility of Results; D012886:Skull / Q000000981:diagnostic imaging; D012984:Software / Q000592:standards / Q000706:statistics & numerical data; D012986:Software Validation; D013499:Surface Properties; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed