Accuracy of Linear Measurements in Cone Beam Computed Tomography With Different Voxel Sizes

Torres, Marianna Guanaes Gomes; Campos, Paulo Sérgio Flores; Segundo, Nilson Pena Neto; Navarro, Marcus Vinícius Teixeira; Crusoé‐Rebello, Iêda

doi:10.1097/id.0b013e31824bf93c

Cited by 65 publications

(77 citation statements)

References 19 publications

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“…Patcas and colleagues [11] (evaluating both bone height and width) showed that 0.4-mm voxel images provided results as accurate as 0.125-mm voxel images. This finding is also in agreement with Torres and coauthors [33], who did not find differences between voxel sizes of 0.2, 0.3, and 0.4 mm, when evaluating linear bone measurements.…”

Section: Assessment Methods Resultssupporting

confidence: 82%

“…The remaining eight studies were based on numerical outcomes measured in the images. Three studies measured 3D surface reconstructions [17,30,31] (and used micro-CT of the teeth as the gold standard), two measured the height and thickness of alveolar bone [11,32], one assessed linear bone measurements (distance between established anatomical landmarks) [33], one measured the thickness of the soft tissue of the face [34], and one measured tooth and root length [35], and these last five studies used caliper measurements of the skulls as the gold standard. Six studies further compared the CBCT images in different resolutions to images acquired using intraoral radiographic systems [18,21,[25][26][27]35].…”

Section: Review Search Resultsmentioning

confidence: 99%

“…For bone walls thinner than the voxel size, measures from both tested voxel sizes were different from the gold standard Patcas et al [11] One observer measured the images, in duplicate. Digital caliper measurements were the gold standard Both voxel resolutions were accurate compared to the gold standard, but the 99 % confidence interval for the absolute measurement error was higher in the lower resolution images Torres et al [33] One observer measured the images, in duplicate. Digital caliper measurements were the gold standard…”

Section: Assessment Methods Resultsmentioning

confidence: 99%

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Impact of Voxel Size Variation on CBCT-Based Diagnostic Outcome in Dentistry: a Systematic Review

2012

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The objective of this study was to make a systematic review on the impact of voxel size in cone beam computed tomography (CBCT)-based image acquisition, retrieving evidence regarding the diagnostic outcome of those images. The MEDLINE bibliographic database was searched from 1950 to June 2012 for reports comparing diverse CBCT voxel sizes. The search strategy was limited to English-language publications using the following combined terms in the search strategy: (voxel or FOV or field of view or resolution) and (CBCT or cone beam CT). The results from the review identified 20 publications that qualitatively or quantitatively assessed the influence of voxel size on CBCT-based diagnostic outcome, and in which the methodology/results comprised at least one of the expected parameters (image acquisition, reconstruction protocols, type of diagnostic task, and presence of a gold standard). The diagnostic task assessed in the studies was diverse, including the detection of root fractures, the detection of caries lesions, and accuracy of 3D surface reconstruction and of bony measurements, among others. From the studies assessed, it is clear that no general protocol can be yet defined for CBCT examination of specific diagnostic tasks in dentistry. Rationale in this direction is an important step to define the utility of CBCT imaging.

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Section: Assessment Methods Resultssupporting

confidence: 82%

Section: Review Search Resultsmentioning

confidence: 99%

Section: Assessment Methods Resultsmentioning

confidence: 99%

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Impact of Voxel Size Variation on CBCT-Based Diagnostic Outcome in Dentistry: a Systematic Review

2012

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“…Após esse período, cada mandíbula foi inserida em uma caixa de isopor (16 cm × 14,5 cm × 10 cm) contendo água, para manutenção do preenchimento dos espaços medulares. As mandíbulas foram posicionadas no interior da caixa de isopor de modo que o plano sagital mediano (PSM) ficasse perpendicular ao plano horizontal (PH), e o plano mandibular alcançasse uma inclinação de 25 graus em relação ao PH, simulando a orientação espacial da mandíbula in vivo (Figura 2) 6 . O conjunto foi levado ao tomógrafo e mantido em posição no cefalostato do aparelho.…”

Section: Materials E Métodounclassified

Avaliação subjetiva da aceitabilidade das imagens de tomografia computadorizada de feixe cônico para o planejamento de implantes osteointegrados

Simões

Campos

2014

Rev. odontol. UNESP

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ResumoIntrodução: Para realização de mensurações precisas para implantes osteointegrados, é necessário que as imagens tomográficas apresentem uma qualidade mínima, que permita a visualização clara das estruturas anatômicas. Objetivo: Diante disso, avaliou-se, subjetivamente, a aceitabilidade das imagens de diferentes protocolos de tomografia computadorizada de feixe cônico (TCFC), para o planejamento de implantes osteointegrados. Material e método: Foram obtidas imagens de TCFC de dez hemimandíbulas maceradas no equipamento K9000 3D, sendo modificada apenas a miliamperagem (Grupo I: 2 mA; Grupo II: 8 mA e Grupo III: 15 mA). As aquisições foram feitas com 80 kV, FOV de 5 × 3,7 cm, matriz de 512 × 512 e voxel de 0,076 mm de espessura. Após as aquisições, três avaliadores analisaram as reconstruções ortogonais em três tamanhos de voxel, constituindo-se, assim, nove grupos experimentais. Após a realização das mensurações de altura e espessura óssea, os avaliadores atribuíram escores (sim ou não) para a aceitabilidade das imagens para mensurações. Resultado: Os grupos apresentaram qualidade de imagem aceitável para o planejamento de implantes, com exceção das imagens adquiridas com 2 mA e analisadas com voxel de 0,076 mm e 0,535 mm. Conclusão: O protocolo de 8 mA e voxel de 2,1 mm deve ser, preferencialmente, indicado na identificação do canal mandibular, já que a dose de radiação é menor do que nos protocolos de 15 mA e a qualidade de imagem é superior aos protocolos de 2 mA; além disso, voxel de 2,1 mm apresentou maior aceitabilidade das imagens.Descritores: Tomografia; diagnóstico por imagem; mandíbula. AbstractIntroduction: Performing accurate measurements for osseointegrated implant requires that the tomographic images show a minimum quality to allow adequate visualization of anatomical structures. Objective: Therefore, the acceptability of images of different Cone-Beam Computed Tomography (CBCT) protocols was assessed subjectively for the planning of osseointegrated implants. Material and method: CBCT images of ten hemimandibles macerated in K9000 3D system were obtained, and only mA was modified (Group I: 2mA, Group II: 8mA and Group III: 15mA). All acquisitions were made with 80kV, FOV of 5 × 3.7 cm, matrix: 512 × 512 and voxel thickness of 0.076 mm. After the acquisitions, the orthogonal reconstructions were analyzed in three voxel sizes by three evaluators, thus making up nine experimental groups . Following bone height and thickness measurements, the evaluators scored (as yes or no) the acceptability of the images to be measured. Result: The groups presented acceptable image quality for implant planning, with the exception of the images acquired with 2mA and analyzed with voxel of 0.076 mm and 0.535 mm. Conclusion: The 8mA and 2.1 mm voxel protocol should preferably be indicated in the identification of the mandibular canal, as the radiation dose is lower than 15mA protocols and image quality is higher than 2 mA protocols. Additionally, 2.1 mm voxel showed a higher acceptability of images.

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“…It may result in injury to the neurovascular bundle and cause some postoperative complaints such as neuroma, paresthesia, anesthesia and hemorrhage [4][5] . It has been stated that CBCT anatomical linear measurements are accurate and reliable [6][7][8][9][10][11][12][13] . However, the inclination of the patient's head during CBCT image acquisition can cause distortion in measurements for preoperative implant planning [14][15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate?

Neves

Vasconcelos²,

de-Azevedo-Vaz³

et al. 2014

Braz. J. Oral Sci.

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Aim: To assess which slice inclination would be more accurate in measuring sites for implant placement: the oblique or the orthoradial slice. Methods: Five regions of eight edentulous mandibles were selected (incisor, canine, premolar, first molar and second molar). The mandibles were scanned with a Next Generation i-CAT CBCT unit. Two previously calibrated oral radiologists performed vertical measurements in all the selected regions using both the oblique and orthoradial slices. The mandibles were sectioned in all the evaluated regions in order to obtain the gold standard. The Wilcoxon signed rank test compared the measurements obtained in the oblique and orthoradial slices with the gold standard. Results: The bone height measurements for the first and second molar regions using the orthoradial slices were statistically different from the gold standard. Conclusions: Using the orthoradial slices to obtain cross-sectional images may offer insufficient accuracy for implant placement in the posterior region.

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Accuracy of Linear Measurements in Cone Beam Computed Tomography With Different Voxel Sizes

Abstract: The accuracy of vertical and horizontal measurements, using CBCT (i-CAT) for the four protocols, was shown to be comparable with the measurements performed on the dry mandible.

Cited by 65 publications

References 19 publications

Impact of Voxel Size Variation on CBCT-Based Diagnostic Outcome in Dentistry: a Systematic Review

Impact of Voxel Size Variation on CBCT-Based Diagnostic Outcome in Dentistry: a Systematic Review

Avaliação subjetiva da aceitabilidade das imagens de tomografia computadorizada de feixe cônico para o planejamento de implantes osteointegrados

Oblique or orthoradial CBCT slices for preoperative implant planning: which one is more accurate?

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