title: Measurement of orbital volume after enucleation and orbital implantation.
abstract: BACKGROUND
  This article reports experience relating to the measurement of orbital volume by means of cone beam computed tomography (CBCT) and Cranioviewer program software in patients who have undergone enucleation and orbital implantation.
  
  
  METHODS
  CBCT scans were made in 30 cases, 10 of which were later excluded because of various technical problems. The study group therefore consisted of 20 patients (8 men and 12 women). The longest follow-up time was 7 years, and the shortest was 1 year. In all 20 cases, the orbital volume was measured with Cranioviewer orbital program software. Slices were made in the ventrodorsal direction at 4.8 mm intervals in the frontal plane, in both bony orbits (both that containing the orbital implant and the healthy one). Similar measurements were made in 20 patients with various dental problems. CBCT scans were recorded for the facial region of the skull, containing the orbital region. The Cranioviewer program can colour the area of the slices red, and it automatically measures the area in mm.
  
  
  RESULTS
  In 5 of the 20 cases, the first 4 or all 5 slices revealed that the volume of the operated orbit was significantly smaller than that of the healthy orbit, in 12 cases only from 1 to 3 of the slices indicated such a significant difference, and in 3 cases no differences were observed between the orbits. In the control group of patients with various dental problems, there was no significant difference between the two healthy orbits. The accuracy of the volume measurements was assessed statistically by means of the paired samples t-test.
  
  
  CONCLUSIONS
  To date, no appropriate method is avaliable for exact measurement of the bony orbital volume, which would be of particular importance in orbital injury reconstruction. However, the use of CBCT scans and Cranioviewer orbital program software appears to offer a reliable method for the measurement of changes in orbital volume.
authors.affiliation: Department of Opthalmology, Faculty of Medicine, Semmelweis University, Budapest, Hungary. lukatsolga@gmail.com
authors.forename: Olga
authors.initials: O
authors.lastname: Lukats
authors.forename: Tamas
authors.initials: T
authors.lastname: Vízkelety
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Markella
authors.forename: Erika
authors.initials: E
authors.lastname: Maka
authors.forename: Maria
authors.initials: M
authors.lastname: Kiss
authors.forename: Adrienn
authors.initials: A
authors.lastname: Dobai
authors.forename: Peter
authors.initials: P
authors.lastname: Bujtár
authors.forename: Attila
authors.initials: A
authors.lastname: Szucs
authors.forename: Jozsef
authors.initials: J
authors.lastname: Barabas
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015353:Eye Enucleation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009915:Orbit / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery; D020273:Orbital Implants; D009929:Organ Size; D011859:Radiography