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. 2020 May 26;49(1):233–250. doi: 10.1007/s10439-020-02525-w

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Atlas from DTMRI data. (a) MRI data were segmented to give the LA blood pool (red), the LA wall (green), the RA blood pool (blue) and the RA wall (yellow). (b) The left and right endocardial and epicardial surfaces were meshed. (c) DTMRI fibres were extracted for each of the LA and RA. (d) Atrial coordinates were calculated (shown here for the LA) and used to express each atrium in a 2D coordinate system. (e) Fibres were expressed in the UAC basis, with a UAC fibre angle. (f) Fibre fields from each of the left or right atrial endocardial or epicardial shells were registered to a common shell using UAC and an average fibre field was calculated. (g) Simulations were run to evaluate the effects of fibre field on activation time maps (examples shown here correspond to the fibre fields in (e) and (f).