Intraobserver and interobserver reproducibility in linear measurements on axial images obtained by cone-beam computed tomography
Silva Nathalia Cristine da, Barriviera Mauricio, Junqueira Jose Luiz Cintra, Panzarella Francine Kuhl, Raitz Ricardo,
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( Silva Nathalia Cristine da ) - Sao Leopoldo Mandic Research Center College of Dentistry Department of Oral Radiology
( Barriviera Mauricio ) - Catholic University of Brasilia College of Dentistry Department of Oral Radiology
( Junqueira Jose Luiz Cintra ) - Sao Leopoldo Mandic Research Center College of Dentistry Department of Oral Radiology
( Panzarella Francine Kuhl ) - Sao Leopoldo Mandic Research Center College of Dentistry Department of Oral Radiology
( Raitz Ricardo ) - Sao Leopoldo Mandic Research Center College of Dentistry Department of Oral Radiology
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.
키워드
Cone-Beam Computed Tomography; Dimensional Measurement Accuracy; Reproducibility of Results
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