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. 2017 Nov 1;7:14798. doi: 10.1038/s41598-017-14941-5

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© The Author(s) 2017

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Overhead lights have minimal effect on LSCI system. Figure shows speckle contrast image of microfluidic flow phantom (a) and average line profile perpendicular to flow channel for both lighting conditions (b); white light image of surgical field with OR lights on (c); speckle contrast image with OR lights on (d); speckle contrast image with OR lights off (e); mean and standard deviation of speckle contrast within parathyroid for both cases (f). Parathyroid glands are indicated with white ellipses and the flow phantom region of interest is indicated with a white rectangle.