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. 2013;42(10):20130206.
doi: 10.1259/dmfr.20130206. Epub 2013 Oct 16.

The effect of scan parameters on cone beam CT trabecular bone microstructural measurements of the human mandible

N Ibrahim  1 , A Parsa, B Hassan, P van der Stelt, I H A Aartman, D Wismeijer
Affiliations

The effect of scan parameters on cone beam CT trabecular bone microstructural measurements of the human mandible

N Ibrahim et al. Dentomaxillofac Radiol. 2013.

Abstract

The objective of this study was to investigate the effect of different cone beam CT scan parameters on trabecular bone microstructure measurements. A human mandibular cadaver was scanned using a cone beam CT (3D Accuitomo 170; J.Morita, Kyota, Japan). 20 cone beam CT images were obtained using 5 different fields of view (4×4 cm, 6×6 cm, 8×8 cm, 10×10 cm and 10×5 cm), 2 types of rotation steps (180° and 360°) and 2 scanning resolutions (standard and high). Image analysis software was used to assess the trabecular bone microstructural parameters (number, thickness and spacing). All parameters were measured twice by one trained observer. Intraclass correlation coefficients showed high intraobserver repeatability (intraclass correlation coefficient, 0.95-0.97) in all parameters across all tested scan parameters. Trabecular bone microstructural measurements varied significantly, especially in smaller fields of view (p = 0.001). There was no significant difference in the trabecular parameters when using different resolutions (number, p = 0.988; thickness, p = 0.960; spacing, p = 0.831) and rotation steps (number, p = 1.000; thickness, p = 0.954; spacing, p = 0.759). The scan field of view significantly influences the trabecular bone microstructure measurements. Rotation steps (180° or 360°) and resolution (standard or high) selections are not relevant.

Keywords: cone beam CT; diagnostic imaging; scanning parameter; trabecular bone.

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Figures

Figure 1
Figure 1
Two data sets from cone beam CT with a 4×4 cm field of view (FOV) and 10×10 cm FOV were matched in Amira v. 4.1 (Visage Imaging Inc., Carlsbad, CA)
Figure 2
Figure 2
A smaller volume of interest of 4×4 cm field of view (FOV) and 10×10 cm FOV was cropped within the boundaries of cortical bone in Amira v. 4.1 (Visage Imaging Inc., Carlsbad, CA)
Figure 3
Figure 3
(a) Data sets from 4×4 cm and 10×10 cm fields of view (FOVs) were compared slice by slice using the 4×4 cm FOV data sets as the reference model. (b) A rectangular region of interest limited to trabecular bone structure was selected for each data set. (c) Images were binarized and (d) processed to allow the microstructural measurements
See this image and copyright information in PMC

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