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Comparison of Orbital Volume Obtained by Tomography and Rapid Prototyping

Roça, Guilherme Berto MD*; Foggiatto, José Aguiomar PhD; Ono, Maria Cecilia Closs MD; Ono, Sergio Eiji MD§; da Silva Freitas, Renato PhD

doi: 10.1097/SCS.0b013e31829a8332
Original Articles

Purpose 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 cm3, the average obtained by the SolidWorks program was 20.64 cm3, and the average measured using the prototype method was 21.81 cm3. 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.

Received March 18, 2013.

Accepted for publication May 5, 2013.

Address correspondence and reprint requests to Dr. Guilherme Berto Roça, Plastic Surgery Unit, Federal University of Paraná, Rua General Carneiro, 181—Hospital de Clínicas Curitiba, CEP 80060-900, Curitiba, Brazil; E-mail:

This is a Thesis of Master Degree of G.B.R., Post Graduate of Surgery—Federal University of Paraná.

The authors report no conflicts of interest.

© 2013 by Mutaz B. Habal, MD.