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Background and Objectives:Although there have ben some reports that measured the size of the mastoid pneumatization, only a few studies have reported the age-related variations in the mastoid air cell system using thre-dimensional (3D) recon-struction techniques of computed tomography (CT) images. This study presents that 3D reconstruction techniques of CT images in Koreans was evaluated. Subjects and Method:Retrospective study. A 3D reconstruction based on the image data obtained from CT was performed in the 205 ears of 105 patients without otologic diseases in order to measure the volume of mastoid pneumatization by a surface-rendering algorithm on a personal computer. Results:The mastoid pneumatization continued to oid pneumatization was 7095.2 mm3 in Korean adults. No statistically significant diference was found betwen males and females or between right and left sides. There was a significant diference between the larger and smaller sides of individuals. Conclusion:The volume measurement technique based on the 3D reconstruction technique reported here is widely available, highly accurate, d diseases.

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