Prof. Joao Vagner Silva Profile

Prof. Joao Vagner Silva

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Proceedings Article | 8 February 2018 Presentation + Paper

Laser speckle imaging for lesion detection on tooth

Luciano Gavinho, João V. Silva, João Damazio, Ravana Sfalcin, Sidnei Araujo, Marcelo Pinto, Silvia R. Olivan, Renato Prates, Sandra Bussadori, Alessandro Deana

Proceedings Volume 10473, 1047306 (2018) https://doi.org/10.1117/12.2286408

KEYWORDS: Image segmentation, Teeth, Speckle, Fractal analysis, Diagnostics, Statistical analysis, Computer vision technology, Speckle pattern, Laser speckle imaging, Dental caries

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Computer vision technologies for diagnostic imaging applied to oral lesions, specifically, carious lesions of the teeth, are in their early years of development. The relevance of this public problem, dental caries, worries countries around the world, as it affects almost the entire population, at least once in the life of each individual. The present work demonstrates current techniques for obtaining information about lesions on teeth by segmentation laser speckle imagens (LSI). Laser speckle image results from laser light reflection on a rough surface, and it was considered a noise but has important features that carry information about the illuminated surface. Even though these are basic images, only a few works have analyzed it by application of computer vision methods. In this article, we present the latest results of our group, in which Computer vision techniques were adapted to segment laser speckle images for diagnostic purposes. These methods are applied to the segmentation of images between healthy and lesioned regions of the tooth. These methods have proven to be effective in the diagnosis of early-stage lesions, often imperceptible in traditional diagnostic methods in the clinical practice. The first method uses first-order statistical models, segmenting the image by comparing the mean and standard deviation of the intensity of the pixels. The second method is based on the distance of the chi-square (χ² ) between the histograms of the image, bringing a significant improvement in the precision of the diagnosis, while a third method introduces the use of fractal geometry, exposing, through of the fractal dimension, more precisely the difference between lesioned areas and healthy areas of a tooth compared to other methods of segmentation. So far, we can observe efficiency in the segmentation of the carious regions. A software was developed for the execution and demonstration of the applicability of the models

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