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. 2021 Feb 4;11:3025. doi: 10.1038/s41598-021-81101-1

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© The Author(s) 2021

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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Overview of the measurement setup and measurement protocol. (A) Photograph of the measurement setup, including the TFM, the radar system, and the examination table¹⁷. (B) Block diagram of the measurement setup. (C) Flowchart of the data synchronisation routine. (D) Cross-correlation of the SYNC sequences which is used to determine the latency between both systems. (E) Synchronisation sequences of the TFM and the radar system after resampling and time shift removal. (F) Depiction of the measurement protocol: after a resting measurement of nine minutes, the CPT manoeuvre is performed, which includes three main parts with a length of 90 s and pauses with a length of 60 s in between.