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Med Biol Eng Comput ; 58(2): 433-442, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31863248

RESUMO

The aim of this study is to use a multilayer perceptron (MLP) artificial neural network (ANN) for phaseless imaging the human heel (modeled as a bilayer dielectric media: bone and surrounding tissue) and the calcaneus cross-section size and location using a two-dimensional (2D) microwave tomographic array. Computer simulations were performed over 2D dielectric maps inspired by computed tomography (CT) images of human heels for training and testing the MLP. A morphometric analysis was performed to account for the scatterer shape influence on the results. A robustness analysis was also conducted in order to study the MLP performance in noisy conditions. The standard deviations of the relative percentage errors on estimating the dielectric properties of the calcaneus bone were relatively high. Regarding the calcaneus surrounding tissue, the dielectric parameters estimations are better, with relative percentage error standard deviations up to ≈ 15%. The location and size of the calcaneus are always properly estimated with absolute error standard deviations up to ≈ 3 mm. Microwave tomography of the calcaneus using phaseless data. Simulations were inspired in Computed Tomography images from real heels (above). Inverse problem was solved using Multilayer Perceptron Artificial Neural Network (below).


Assuntos
Calcâneo/diagnóstico por imagem , Imageamento de Micro-Ondas , Redes Neurais de Computação , Tomografia Computadorizada por Raios X/métodos , Calcâneo/fisiologia , Condutividade Elétrica , Calcanhar/diagnóstico por imagem , Calcanhar/fisiologia , Humanos , Processamento de Imagem Assistida por Computador
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