Accuracy assessment of the axial images obtained from cone beam computed tomography

Panzarella, Francine Kühl; Junqueira, José Luiz Cintra; Oliveira, Luciana Butini; Araujo, Nara Santos; Costa, Cláudio

doi:10.1259/dmfr/88722046

Cited by 16 publications

(12 citation statements)

References 33 publications

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“…Using ICCs, it was found that the accuracy of the linear measurements versus the gold standard was excellent for both devices (Table 2), although all linear measurements were underestimated by the examiners, corroborating the results of several studies described in the literature 4679101123. In addition, thin bony structures of less than 0.5 mm in size are not relevant in actual clinical practice, which compromises the reliability of the CBCT images310 once areas without bone are considered.…”

Section: Discussionsupporting

confidence: 81%

“…In the present study, known and calibrated measurements from a geometric phantom from a previous study were used as the gold standard 6. This provides the advantage of high reproducibility without exposure of living tissue.…”

Section: Discussionmentioning

confidence: 99%

“…The phantom used for this study was based on that of a previous study 6. It was made from nylon, a slightly radiopaque material with a low thermal expansion coefficient, in a cylindrical shape (5 cm in diameter and 10 cm in length).…”

Section: Methodsmentioning

confidence: 99%

“…The accuracy and reliability of linear measurements in cone-beam computed tomography (CBCT) images has been established in several published scientific studies,1234567891011 including studies where they have been obtained from CBCT-derived models 212…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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PurposeThis 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 MethodsA 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.ResultsAll 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.ConclusionIt can be concluded that both scanners are accurate, although the linear measurements are underestimations, with no significant differences between the evaluators.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…A number of studies have assessed CBCT's measurement accuracy within the oral maxillofacial region using various measurement protocols, acquisition parameters, CBCT units, and research objectives. For assessments of alveolar bone, investigators have used phantom modules , porcine heads and maxillae , bovine ribs , dry human heads , maxillae and mandibles , embalmed human cadaver heads , and fresh frozen human cadaver heads . The majority of the studies, including the current one, support the accuracy and reliability of measurements of alveolar bone derived from CBCT and the appropriateness of CBCT for use in clinical studies investigating alveolar bone morphology .…”

Section: Discussionmentioning

confidence: 92%

Accuracy of alveolar bone measurements from cone beam computed tomography acquired using varying settings

Cook

Timock²,

Crowe

et al. 2015

Orthod Craniofacial Res

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Structured Abstract Objectives To investigate the accuracy and reliability of cone beam computed tomography (CBCT) measurements of buccal alveolar bone height (BBH) and thickness (BBT) using custom acquisition settings. Settings and Sample Population School of Dentistry, Oregon Health & Science University. Twelve embalmed cadavers. Materials and Methods Cadaver heads were imaged by CBCT (i‐CAT® 17–19, Imaging Sciences International, Hatfield, PA) using a ‘long scan’ (LS) setting with 619 projection images, 360° revolution, 26.9 s duration, and 0.2 mm voxel size, and using a ‘short scan’ (SS) setting with 169 projection images, 180° rotation, 4.8 s duration, and 0.3 mm voxel size. BBH and BBT were measured with 65 teeth, indirectly from CBCT images and directly through dissection. Comparisons were assessed using paired t‐tests (p ≤ 0.05). Level of agreement was assessed by concordance correlation coefficients, Pearson's correlation coefficients, and Bland–Altman plots. Results Mean differences in measurements compared to direct measurements were as follows, LS 0.17 ± 0.12 (BBH) and 0.10 ± 0.07 mm (BBT), and SS 0.41 ± 0.32 (BBH) and 0.12 ± 0.11 mm (BBT). No statistical differences were found with any of BBH or BBT measurements. Correlation coefficients and Bland–Altman plots showed agreement was high between direct and indirect measurement methods, although agreement was stronger for measurements of BBH than BBT. Conclusions Compared to the LS, the similarity in results with the reduced scan times and hence reduced effective radiation dose, favors use of shorter scans, unless other purposes for higher resolution imaging can be defined.

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Cone-beam computed tomography and microtomography for alveolar bone measurements

Ferrare

Leite

Caracas³

et al. 2013

Surg Radiol Anat

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CBCT underestimated bone height. No statistically significant differences were found for bone thickness. Regions of thin bone tissue may not be visualized on CBCT images. There are risks of underestimating bone measurements with CBCT and assuming bone loss that does not exist clinically. Although the difference of the bone height measurement was small, the clinical relevance must be analyzed on how to interpret CBCT.

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Accuracy assessment of the axial images obtained from cone beam computed tomography

Cited by 16 publications

References 33 publications

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

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

Accuracy of alveolar bone measurements from cone beam computed tomography acquired using varying settings

Cone-beam computed tomography and microtomography for alveolar bone measurements

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