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. 2015 Jan 27;13:5. doi: 10.1186/s12951-015-0065-9

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© Zou et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Sensitivity and linear correlation between signal intensity and Ag NP concentrations shown by micro CT phantom. Ag NPs were dissolved in H₂O at variable concentrations (mM) and imaged using micro CT (A). The signal intensities of each dot were normalized by dividing with that of the air and linear correlation with the Ag NP concentrations was estimated (B). Concentrations in A: 0 = H₂O; 1=, 92.7 mM; 3 = 185.4.4 mM; 3 = 278.0 mM; 4 = 370.7 mM. AU: arbitrary unit; L: linear; O: observed.