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. 2019 Nov 27;10(12):820. doi: 10.3390/mi10120820

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© 2019 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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Performance test of the developed handheld dual-modality US/PA imaging system. (A) Photograph of the setup of the in vitro imaging experiment before the addition of Intralipid. (B) Quantified SNRs of blue ink at various depths (0.5, 1.0, 2.0, 3.0 and 4.0 cm) and (C) concentrations (undiluted and diluted to 50%, 25% and 12.5% in saline) of blue ink at an excitation wavelength of 750 nm. (D) Overlaid US/PA images at various depths. (E) Overlaid US/PA images for various blue ink concentrations (undiluted and diluted 50%, 25% and 12.5% in saline). US, ultrasound; PA, photoacoustic; A.U., arbitrary units; SNR, signal-to-noise ratio.

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