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Doctoral Thesis
DOI
10.11606/T.25.2012.tde-03042013-153516
Document
Author
Full name
Marcelo Lupion Poleti
Institute/School/College
Knowledge Area
Date of Defense
Published
Bauru, 2012
Supervisor
Committee
Bullen, Izabel Regina Fischer Rubira de (President)
Carreira, Daniela Gamba Garib
Conti, Ana Claudia de Castro Ferreira
Sant'Ana, Eduardo
Sarmento, Viviane Almeida
Title in Portuguese
Análise de medidas lineares da mandíbula em modelos tridimensionais reformatados a partir da tomografia computadorizada de feixe cônico
Keywords in Portuguese
Diagnóstico por imagem
Imagem tridimensional
Mandíbula
Software
Tomografia computadorizada de feixe cônico
Abstract in Portuguese
Objetivo: Avaliar a precisão e a acurácia de medidas lineares da mandíbula em modelos tridimensionais gerados a partir da tomografia computadorizada de feixe cônico (TCFC) em dois programas (Dolphin®. Material e Métodos: Dez mandíbulas com marcadores de sílica foram submetidas à TCFC seguindo o protocolo de voxel 0,3 mm do aparelho i-CAT Classic®. Vinte medidas lineares foram realizadas duas vezes, de maneira aleatória, nos modelos tridimensionais nos programas Dolphin®, nos filtros Translúcido e Sólido-1, e InVesalius®. As medidas físicas foram realizadas com um paquímetro digital diretamente nas mandíbulas por um segundo examinador. Análise de variância para medidas repetidas (ANOVA), coeficiente de correlação intraclasse, teste de Bland-Altman e erro absoluto e percentual foram utilizados para avaliar a precisão e a acurácia (p<0,05). Resultados: Alta precisão foi encontrada no programa Dolphin®, filtro Translúcido e Sólido-1 e InVesalius®, com diferença máxima entre as mensurações de 0,27; 0,26 e 0,17 mm, respectivamente. Com relação à acurácia, 10 variáveis no filtro Translúcido; oito no filtro Sólido-1 e 13 no programa inVesalius® foram diferentes estatisticamente em relação as medidas físicas. Porém, 95%, 100% e 90% das medidas apresentaram valores abaixo do valor considerado clinicamente relevante (1 mm) nos filtros Translúcido e Sólido-1 e no programa InVesalius®, respectivamente. Conclusão: Os modelos tridimensionais com marcadores hiperdensos, gerados pelos programas Dolphin®, filtro Translúcido e Sólido-1, e InVesalius® podem ser utilizados com precisão e acurácia para a obtenção de medidas lineares.
Title in English
Mandibular linear measurements on 3D CBCT models
Keywords in English
Cone-Beam Computed Tomography
Diagnostic imaging
Mandible
Software
Three-dimensional image
Abstract in English
Objective: The purpose of this study was to determine the accuracy and reliability of mandibular linear measurements obtained from 3-dimensional cone-beam computed tomography (CBCT) scans of dry human mandibles using different software (Dolphin® and InVesalius®). Methods: Ten dry human mandibles were scanned at voxel size of 0.3 mm (i-CAT Classic®). Twenty measurements were made twice, randomized, on 3D model generated by the software Dolphin (filter Translucent and Solid-1) and InVesalius. Subsequently, physical measurements were made using a digital caliper. Analysis of variance for repeated measures (ANOVA), Intraclass correlation (ICC) BlandAltman, absolute and percentage mean error were used for evaluating accuracy and reliability (p<0.05). Results: Excellent reliability values were found for linear measurements from CBCT volume rendering images in all methods (Dolphin Translucent, Solid-1 and InVesalius), with the mean measurement of 0.27; 0.26 and 0.17 mm, respectively. Ten measurement errors for Dolphin Translucent, eight for Solid-1 and 13 for InVesalius were statistically significant different from physical measurements; however, 95%, 100% and 90% of the measurements were, respectively, below the value clinically relevant (1 mm). Conclusion: Linear measurements on 3D model generated by the software Dolphin (Translucent and Solid-1) and InVesalius are reliable and accurate and can be used for linear measurements.
 
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Publishing Date
2013-04-08
 
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