Comparison of orbital volume obtained by tomography and rapid prototyping.
OBJECTIVE
This study aims to compare orbital volume obtained by helical tomography and rapid prototyping.


METHODS
The study sample was composed of 6 helical tomography scans. Eleven healthy orbits were identified to have their volumes measured. The volumetric analysis with the helical tomography utilized the same protocol developed by the Plastic Surgery Unit of the Federal University of Paraná. From the CT images, 11 prototypes were created, and their respective volumes were analyzed in 2 ways: using software by SolidWorks and by direct analysis, when the prototype was filled with saline solution. For statistical analysis, the results of the volumes of the 11 orbits were considered independent.


RESULTS
The average orbital volume measurements obtained by the method of Ono et al was 20.51 cm, the average obtained by the SolidWorks program was 20.64 cm, and the average measured using the prototype method was 21.81 cm. The 3 methods demonstrated a strong correlation between the measurements. The right and left orbits of each patient had similar volumes.


CONCLUSIONS
The tomographic method for the analysis of orbital volume using the Ono protocol yielded consistent values, and by combining this method with rapid prototyping, both reliability validations of results were enhanced.
From the *Federal University of Paraná; †Federal University of Technology of Paraná; ‡Plastic Surgery Unit, Federal University of Paraná; §Department of Radiology of DAPI; and ∥Plastic Surgery Unit, Federal University of Paraná, Curitiba, Brazil.
Guilherme Berto
GB
Roça
José Aguiomar
JA
Foggiatto
Maria Cecilia Closs
MC
Ono
Sergio Eiji
SE
Ono
Renato
R
da Silva Freitas
D000328:Adult; D003198:Computer Simulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D009915:Orbit / Q000000981:diagnostic imaging*; D009929:Organ Size / Q000502:physiology; D019651:Plastic Surgery Procedures; D012016:Reference Values; D012984:Software; D013223:Statistics as Topic; D036542:Tomography, Spiral Computed; D055815:Young Adult