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. 2021 Sep 28;156:104599. doi: 10.1016/j.ijmedinf.2021.104599

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© 2021 The Author(s)

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. 2 — Overview of chest x-ray image sharing framework. (A) Researcher 1 shares images belonging to n patients, where each image (e.g., X KB for Image_{11_1}) is first scaled to a “preview” image less than C KB (C being the maximum KB size of each image piece) and then separately split into C KB “image pieces”. (B) The smart contract stores the preview image along with the image pieces on each block, maintaining patient/image relationships. (C) Researcher 2 loads the preview image first, and then loads the image pieces and merges them back to their original image.