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. 2018 Oct 25;19(11):3318. doi: 10.3390/ijms19113318

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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A conventional B-mode plane-wave image (9 compounding angles) of a tissue-mimicking agar phantom with an overlaid photoacoustic image generated by a 8 mm diameter inclusion of Au50 AuNRs (concentration 20 μg/mL) at a depth of 3mm below the surface and a laser fluence $= 19 \pm$ 2 mJ/cm² at the surface. The PA signal is referenced to the maximum of the B-mode image (dB). Red circle indicates the region of AuNRs.