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http://dx.doi.org/10.5624/isd.2017.47.1.11

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

Silva, Nathalia Cristine da (Sao Leopoldo Mandic Research Center, Department of Oral Radiology, College of Dentistry)
Barriviera, Mauricio (Department of Oral Radiology, College of Dentistry, Catholic University of Brasilia)
Junqueira, Jose Luiz Cintra (Sao Leopoldo Mandic Research Center, Department of Oral Radiology, College of Dentistry)
Panzarella, Francine Kuhl (Sao Leopoldo Mandic Research Center, Department of Oral Radiology, College of Dentistry)
Raitz, Ricardo (Sao Leopoldo Mandic Research Center, Department of Oral Radiology, College of Dentistry)
Publication Information
Imaging Science in Dentistry / v.47, no.1, 2017 , pp. 11-15 More about this Journal
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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