Effects of exposure time and voxel size on measured alveolar bone thickness in cone-beam computed tomography: An ex vivo animal study using a pig model
- Author:
Graham GARVEY
1
;
Werner Harumiti SHINTAKU
;
Wanda I. CLARO
;
Anastasios KARYDIS
;
Chenhao ZHAO
;
Ayman Al DAYEH
Author Information
- Publication Type:Original Articles
- From:Imaging Science in Dentistry 2025;55(4):392-399
- CountryRepublic of Korea
- Language:English
-
Abstract:
Purpose:This study assessed the effects of cone-beam computed tomography (CBCT) voxel size and exposure settings on the accuracy of alveolar bone thickness (BT) measurements.
Materials and Methods:Seven pig mandibles were scanned using 6 CBCT settings: 200, 400, and 600 μm voxels,each with an ultra-low dose (ULD) and a standard dose (SD) setting. BT was measured at 3 locations on 1 anterior and 1 posterior tooth. These teeth were then scanned using micro-computed tomography (micro-CT), and BT was measured at the same locations. The intraclass correlation coefficient (ICC) and paired t-test were used to evaluate agreement between CBCT and micro-CT measurements. The discrepancy between CBCT and micro-CT measurements was calculated, and repeated-measures analysis of variance (RMANOVA) was used to evaluate the effects of the 6 CBCT settings on BT measurement accuracy.
Results:The lowest discrepancy between micro-CT and CBCT was observed with the 600 μm ULD (0.29±0.39 mm), followed by the 200 μm SD (0.41±0.72 mm). When BT was less than 2 mm, the lowest discrepancy occurred with the 200 μm SD (0.29±0.33 mm), followed by the 600 μm ULD (0.32±0.25 mm). The ICC between CBCT and micro-CTdecreased as BT decreased. RMANOVA indicated no significant effect of CBCT settings on measurement accuracy.
Conclusion:BT measured with the 600 μm ULD was comparable to that obtained with the 200 μm SD. Thediscrepancy between CBCT and micro-CT was notable, especially when BT was less than 2 mm.
