Article human 9 image segmentation Humans 8 Deep learning 6 deep learning 6 diagnostic imaging 6 machine learning 6 COVID-19 5 SARS-CoV-2 5 coronavirus disease 2019 5 learning algorithm 5 training 5 Computerized tomography 4 algorithm 4 computer assisted tomography 4 mathematical model 4 thorax radiography 4 Algorithms 3 Biological organs 3 Deep Learning 3 Diagnosis 3 Learning systems 3 Lung 3 controlled study 3 convolutional neural network 3 feature extraction 3 lung 3 videorecording 3 x-ray computed tomography 3