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. Author manuscript; available in PMC: 2018 Oct 24.
Published in final edited form as: Small. 2018 Apr 10;14(19):e1703683. doi: 10.1002/smll.201703683

Figure 6.

Figure 6.

a) Photograph of a phantom for MRI. Test tubes containing different concentrations of SDN in aqueous solution and plain agarose in water (as a reference) were arranged in parallel and placed in a larger plastic tube filled with water. b) Axial section of this phantom shows darkening of the test tubes while SDN concentrations increase. c) Plot of T2-contrast relative to the reference. d) T2-relaxation curves for plain agarose (solid line) and an SDN concentration of 3 × 107 particles mL−1.