Chest X-Rays Image Classification from beta-Variational Autoencoders Latent Features

Abstract

Chest X-Ray (CXR) is one of the most common diagnostic techniques used in everyday clinical practice all around the world. We hereby present a work which intends to investigate and analyse the use of Deep Learning (DL) techniques to extract information from such images and allow to classify them, trying to keep our methodology as general as possible and possibly also usable in a real world scenario without much effort, in the future. To move in this direction, we trained several beta-Variational Autoencoder (beta-VAE) models on the CheXpert dataset, one of the largest publicly available collection of labeled CXR images; from these models, latent features have been extracted and used to train other Machine Learning models, able to classify the original images from the features extracted by the beta-VAE. Lastly, tree-based models have been combined together in ensemblings to improve the results without the necessity of further training or models engineering. Expecting some drop in pure performance with the respect to state of the art classification specific models, we obtained encouraging results, which show the viability of our approach and the usability of the high level features extracted by the autoencoders for classification tasks.

arXiv comment8 pages, 5 figures

References in corpus (11)

• Adam: A Method for Stochastic Optimization
• Very Deep Convolutional Networks for Large-Scale Image Recognition
• Scikit-learn: Machine Learning in Python
• Grad-CAM: Visual Explanations from Deep Networks via Gradient-based Localization
• ChestX-ray8: Hospital-scale Chest X-ray Database and Benchmarks on Weakly-Supervised Classification and Localization of Common Thorax Diseases
• CheXNet: Radiologist-Level Pneumonia Detection on Chest X-Rays with Deep Learning
• Rethinking the Inception Architecture for Computer Vision
• MIMIC-CXR-JPG, a large publicly available database of labeled chest radiographs
• Large Scale Automated Reading of Frontal and Lateral Chest X-Rays using Dual Convolutional Neural Networks
• Weakly Supervised Lesion Localization With Probabilistic-CAM Pooling
• k*-Nearest Neighbors: From Global to Local