Publication

Deep Convolutional Neural Network for Ultrasound Image Enhancement

Résumé

The problem of improving image quality in ultrafast ultrasound (US) imaging by means of regularized iterative algorithms has raised a vast interest in the US community. These approaches usually rely on standard image processing priors, such as wavelet sparsity, which are of limited efficacy in the context of US imaging. Moreover, the high computational complexity of iterative approaches make them difficult to deploy in real-time applications. We propose an approach which relies on a convolutional neural network trained exclusively on a simulated dataset for the purpose of improving images reconstructed from a single plane wave (PW) insonification. We provide extensive results on numerical and in vivo data from the plane wave imaging challenge (PICMUS). We show that the proposed approach can be applied in real-time settings, with an increase in contrast-to-noise ratio of more than 8.4 dB and an improvement of the lateral resolution by at least 25 %.

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En apprentissage automatique, un réseau de neurones convolutifs ou réseau de neurones à convolution (en anglais CNN ou ConvNet pour convolutional neural networks) est un type de réseau de neurones artificiels acycliques (feed-forward), dans lequel le motif de connexion entre les neurones est inspiré par le cortex visuel des animaux. Les neurones de cette région du cerveau sont arrangés de sorte qu'ils correspondent à des régions qui se chevauchent lors du pavage du champ visuel.
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L'apprentissage profond ou apprentissage en profondeur (en anglais : deep learning, deep structured learning, hierarchical learning) est un sous-domaine de l’intelligence artificielle qui utilise des réseaux neuronaux pour résoudre des tâches complexes grâce à des architectures articulées de différentes transformations non linéaires. Ces techniques ont permis des progrès importants et rapides dans les domaines de l'analyse du signal sonore ou visuel et notamment de la reconnaissance faciale, de la reconnaissance vocale, de la vision par ordinateur, du traitement automatisé du langage.
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