The effects of voxel size on cone beam computed tomography images of the temporomandibular joints

Lukat, T D; Perschbacher, Susanne E.; Pharoah, Michael J.; Lam, Ernest W.N.

doi:10.1016/j.oooo.2014.10.015

Cited by 20 publications

(30 citation statements)

References 9 publications

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“…However, there are a great variety of protocols that may be selected for image acquisition, varying mainly in relation to field of view and voxel size. Considering that voxel sizes 0.076 mm and 0.3 mm showed no significant differences in the accuracy of the diagnosis of bone changes in TMJs, 15 we used images obtained with 0.2 mm voxel, which allowed the observation of bone changes. Regarding the field of view, the use of a relative wide area is justified because both left and rights sides of the TMJ have to be displayed.…”

Section: Discussionmentioning

confidence: 99%

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Relationship between articular eminence inclination and alterations of the mandibular condyle: a CBCT study

Cruz

Melo

et al. 2017

Braz. oral res.

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This study aimed at verifying the correlation among angulation of the articular eminence (AE), shape of the condyle and its degenerative bone diseases (DBDs), according to age and sex, through Cone Beam Computed Tomography (CBCT). Five hundred and twenty-eight temporomandibular joints (TMJ) were evaluated. The condyles were classified as: flat, convex, angled and rounded, and the AE angulation was measured. The DBDs evaluated were osteophytes, flattening, erosion, subcortical cysts and spinal sclerosis. There was no difference in the mean angulations in relation to age group (p>0.05). In age groups of 60-69 years (p=0.003) and 70 years or over (p=0.021), the angulation was higher in males. There was an association between DBD and sex (p=0.047), in that the prevalence was higher in females. Differences in AE angles were not observed in condyles with one or no DBDs (p>0.05). However, the presence of two or more DBDs led to a decrease in the angle (p<0.05). Angled condyles showed higher AE angulations than the flat and convex types (p<0.01). In conclusion, the AE inclination is influenced by DBD and condyle shape; an association of two or more bone diseases in the condyle, or its flat or convex anatomy, results in a decrease in the angulation.

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Section: Discussionmentioning

confidence: 99%

“…3,6 Currently, CBCT is the imaging modality of choice to investigate bone alterations of the TMJ, since it is possible to obtain sections of this structure on several levels. 6,15,16,17,18 Accordingly, the morphology of the osseous joint components, cortical bone integrity, and subcortical bone changes can be viewed using CBCT.…”

Section: Introductionmentioning

confidence: 99%

Relationship between articular eminence inclination and alterations of the mandibular condyle: a CBCT study

Cruz

Melo

et al. 2017

Braz. oral res.

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“…It has been hypothesized that CBCT image voxel size is inversely related to the ability to detect osseous changes observed in degenerative joint disease of TMJ (5). However, no significant differences were found in the abilities of oral and maxillofacial radiologists to detect osseous changes using different voxel size protocols (5).…”

Section: Introductionmentioning

confidence: 99%

“…However, no significant differences were found in the abilities of oral and maxillofacial radiologists to detect osseous changes using different voxel size protocols (5). …”

Section: Introductionmentioning

confidence: 99%

Influence of voxel size on the accuracy of linear measurements of the condyle in images of cone beam computed tomography: A pilot study

Costa¹,

Barbosa²,

Gomes³

et al. 2018

J Clin Exp Dent

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BackgroundTo analyze the influence of voxel size and exposure time on the accuracy of linear measurements of the condyle.Material and MethodsFour macerated hemi-mandibles of pigs were scanned in nine different voxel size protocols. Three-dimensional models of the condyle were generated in order to establish a comparison between linear measurements obtained with each voxel protocol and those obtained with a caliper (gold standard). The comparison between the protocols was performed considering the average of the two measurements of the condyle in the latero-medial (LM) and antero-posterior (AP) axes and also through repeated measurement ANOVA with rank transformation. The level of significance was 5%.ResultsA significant difference was found between the protocols regarding the LM and AP variables (p-values = 0.0027 and 0.0263, respectively). In the LM axis, the protocol P6 (voxel size of 0.3 mm with scan time of 4.8 seconds) did not show statistical difference compared to the gold standard. The protocols P4 and P5 (voxel size of 0.25 mm with scan times of 14.7 and 26.9 seconds, respectively) were both statistically similar compared to caliper, although they have presented a longer scan time. In the AP axis, the protocol P8 (voxel size of 0.4 mm with time scan of 4.8 seconds) was statistically similar to the gold standard.ConclusionsA smaller voxel size does not necessarily mean more accuracy regarding the linear measurements of the condyle. It is possible to obtain an acceptable level of accuracy with a larger voxel size and a shorter exposure time to radiation. Key words:CBCT, voxel size, linear measurement, diagnostic imaging.

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“…Lukat et al21 have already reported this result and emphasized that high spatial resolution allows for the thorough detection of subtle structures, such as small changes in the cortical or the buccal bone of the temporomandibular joint 3522…”

Section: Discussionmentioning

confidence: 80%

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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The effects of voxel size on cone beam computed tomography images of the temporomandibular joints

Cited by 20 publications

References 9 publications

Relationship between articular eminence inclination and alterations of the mandibular condyle: a CBCT study

Relationship between articular eminence inclination and alterations of the mandibular condyle: a CBCT study

Influence of voxel size on the accuracy of linear measurements of the condyle in images of cone beam computed tomography: A pilot study

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

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