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. Author manuscript; available in PMC: 2015 Aug 6.
Published in final edited form as: Adv Funct Mater. 2014 Apr 22;24(29):4584–4594. doi: 10.1002/adfm.201400653

Figure 3.

Figure 3

Relaxometric characterization of the magnetic nanoconstructs. a, The transversal (r2) and longitudinal (r1) relaxivities, and the r2/r1 ratio are listed for the free USPIOs and the corresponding USPIO-loaded nanoconstructs, as derived from a bench-top relaxometric analysis. The change in transversal relaxivity Δr2 and Δr2/r1 ratio is also provided, showing a significant enhancement in MRI performance for all configurations. Note that for the DPNs, the enhancement is calculated with respect to the hydrophilic 5 nm USPIOs. b, Phantom images for different concentrations of the 5 nm USPIO-loaded SiMPs (magnetic nanoconstructs) generated using a 3T Philips MRI clinical scanner. Note that 107 SiMPs are equivalent to ~ 0.2 μg of Fe.