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Bone Mineral Density Analysis for Evaluation of Cervical Vertebral Maturation

Bethany A. Crawford

出版	Ohio State University, 2013
URL	http://books.google.com.hk/books?id=nBLPnQEACAAJ&hl=&source=gbs_api

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Materials and methods: Cone beam computerized tomography (CBCT) images were obtained from 41 patients before and after orthodontic treatments. Patients were 14.47±1.42 years and 16.15±1.38 years before and after treatments, respectively. IRB approval was obtained for this retrospective CBCT analysis. Two cervical vertebrae (C2 and C3) were digitally isolated using the three dimensional CBCT. Gray level histogram of each vertebra was obtained using CT attenuation values of voxels. Mean and standard deviation (SD) of gray level histogram were obtained. Percentage (%) differences of gray level parameters between C2 and C3 ((C3-C2)/(C2+C3)/2)*100) were computed. A paired t-test was utilized to compare the % differences between before and after treatments.