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. 2017 Mar;47(1):11-15.
doi: 10.5624/isd.2017.47.1.11. Epub 2017 Mar 21.

Intraobserver and interobserver reproducibility in linear measurements on axial images obtained by cone-beam computed tomography

Nathália Cristine da Silva  1 , Maurício Barriviera  2 , José Luiz Cintra Junqueira  1 , Francine Kühl Panzarella  1 , Ricardo Raitz  1
Affiliations

Intraobserver and interobserver reproducibility in linear measurements on axial images obtained by cone-beam computed tomography

Nathália Cristine da Silva et al. Imaging Sci Dent. 2017 Mar.

Abstract

Purpose: This study was performed to investigate the intra- and inter-observer variability in linear measurements with axial images obtained by PreXion (PreXion Inc., San Mateo, USA) and i-CAT (Imaging Sciences International, Xoran Technologies Inc., Hatfield, USA) CBCT scanners, with different voxel sizes.

Materials and methods: A cylindrical object made from nylon with radiopaque markers (phantom) was scanned by i-CAT and PreXion 3D devices. For each axial image, measurements were taken twice in the horizontal (distance A-B) and vertical (distance C-D) directions, randomly, with a one-week interval between measurements, by four oral radiologists with five years or more experience in the use of these measuring tools.

Results: All of the obtained linear measurements had lower values than those of the phantom. The statistical analysis showed high intra- and inter-observer reliability (p=0.297). Compared to the real measurements, the measurements obtained using the i-CAT device and PreXion tomography, on average, revealed absolute errors ranging from 0.22 to 0.59 mm and from 0.23 to 0.63 mm, respectively.

Conclusion: It can be concluded that both scanners are accurate, although the linear measurements are underestimations, with no significant differences between the evaluators.

Keywords: Cone-Beam Computed Tomography; Dimensional Measurement Accuracy; Reproducibility of Results.

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Figures

Fig. 1
Fig. 1. The universal measuring machine.
Fig. 2
Fig. 2. Phantom image with the coordinates A1, B1, C1, and D1.
Fig. 3
Fig. 3. Identifying coordinates of the phantom.
See this image and copyright information in PMC

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