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. 2018 May 3;17:54. doi: 10.1186/s12938-018-0490-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 5 — The spectrogram results of the first case for a comparison. Top: the spectrogram of different time series related to the RRI; bottom: the spectrogram of different time series related to the inverse of the QTc. Compared with the tvPS provided by ConceFT, the spectrogram is blurred and the pattern is less easy to identify. For example, the daily oscillation (indicated by the red arrow) after day 4 is very blurred