Precisão e acurácia de medidas lineares da mandíbula em imagens 3D obtidas por meio da tomografia computadorizada de feixe cônico / Accuracy and reliability of mandibular linear measurements on 3D CBCT images with different voxel sizes

AUTOR(ES)

Thais Maria Freire Fernandes

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

29/09/2011

RESUMO

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 voxel sizes. Methods: Ten dry human mandibles were scanned at voxel sizes of 0.2 and 0.4 mm. Craniometric anatomical landmarks were identified on the multiplanar reconstructed and on volume rendering images that were generated by the software Dolphin®, independently, by two operators twice. Subsequently, physical measurements were made using a digital caliper. Analysis of variance for repeated measures (ANOVA), Intraclass correlation (ICC) and BlandAltman were used for evaluating accuracy and reliability(p<0.05). Results: Excellent intrarater and good interobserver reliability values were found for linear measurements from CBCT images, with only one exception, interforame width, between observers in volume rendering images. Measurements performed on multiplanar reconstructed images were more accurate than the measurements in volume rendering compared to the gold standard. Conclusion: Linear measurements on multiplanar images of 0.2 and 0.4-voxel are reliable and accurate when compared with direct caliper measurements. Caution should be taken in the volume rendering measurements, because the measurements were reliable, but not accurate for all variables. A protocol with less exposure, without compromising the diagnosis becomes feasible, because an increased voxel resolution did not result in greater accuracy of the measurements and potentially provides increased patient radiation exposure.

ASSUNTO(S)

cone-beam computed tomography mandible mandíbula orthodontics ortodontia tomografia computadorizada de feixe cônico

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