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. 2019 Feb 27;9:2933. doi: 10.1038/s41598-018-37588-2

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© The Author(s) 2019

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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US (a–e) and PA (f–j) mechanically scanned transverse images of a fiber tip placed inside a blood-filled tube at behind (panels a–b and f–g) of the tip, at the fiber tip (panels c,h) and after passing the fiber (panels d–e, and i–j). US imaging is unable to distinguish between the fiber tip and the cross section of the fiber in (a–c). The accurate location of the fiber tip is clearly seen using thresholded PA imaging in (h).