The reliability of "Analyze" software in measuring orbital volume utilizing CT-derived data.
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.
Koppel
David Andrew
DA
West of Scotland Regional Maxillofacial Unit, Southern General Hospital, Glasgow, UK.
Foy
Richard Hirsch
RH
McCaul
James Anthony
JA
Logan
Jane
J
Hadley
Donald Montague
DM
Ayoub
Ashraf
A
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