COVID 19 Screening on Chest X ray Images Using Deep Learning based Anomaly Detection
Coronaviruses are important human and animal pathogens. To date the novel COVID 19 coronavirus is rapidly spreading worldwide and subsequently threatening health of billions of humans. Clinical studies have shown that most COVID 19 patients suffer from the lung infection. Although chest CT has been shown to be an effective imaging technique for lung related disease diagnosis, chest Xray is more widely available due to its faster imaging time and considerably lower cost than CT. Deep learning, one of the most successful AI techniques, is an effective means to assist radiologists to analyze the vast amount of chest X ray images, which can be critical for efficient and reliable COVID 19 screening. In this work, we aim to develop a new deep anomaly detection model for fast, reliable screening. To evaluate the model performance, we have collected 100 chest X ray images of 70 patients confirmed with COVID 19 from the Github repository1. To facilitate deep learning, more data are needed. Thus, we have also collected 1431 additional chest X ray images confirmed as other pneumonia of 1008 patients from the public ChestX ray14 dataset. Our initial experimental results show that the model developed here can reliably detect 96.00% COVID 19 cases (sensitivity being 96.00% and 70.65% non COVID 19 cases (specificity being 70.65% when evaluated on 1531 Xray images with two splits of the dataset, offering a promise of our proposed model for reliable COVID 19 screening of chest X ray images. *The first two authors equally contributed to this work.This work was done when the first two authors were visiting The University of Adelaide. 1https:/github.com/ieee8023/covid chestxray dataset
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