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. 2020 Nov 19;3:100014. doi: 10.1016/j.ibmed.2020.100014

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© 2020 The Authors

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 3 — Activation Maps of the Artificial Intelligence (AI) System. a) Example of a single activation map on a CXR image from the COVID-19 group. b) Mean activation map of Non-COVID-19 pneumonia category. c) Mean activation map of COVID-19 pneumonia category. d) Delta activation map between COVID-19 and Non-COVID-19 pneumonia categories calculated by $m a x_{i, j} (C o v i d M e a n M a p_{i, j} - N o n C o v i d M e a n M a p_{i, j}$ , 0) for each pixel (i,j), depicting lower and peripheral areas as more relevant for the differentiation.