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Spin echo MR image of the superparamagnetic iron oxide (SPIO) nanomaterials suspensions. (A) Diagram for iron concentration series; (B) SPIO@SiO2 (C) SPIO@dextran; (D) SPIO@PEG. The concentrations are (0): Deionised water, (1) 0.1 µgFe/mL; (2) 0.3 µgFe/mL; (3) 0.6 µgFe/mL; (4) 1 µgFe/mL, (5) 2 µgFe/mL; (6) 3 µgFe/mL; (7) 5 µgFe/mL; (8) 10 µgFe/mL. Note that the SPIO@SiO2 concentration of 1 µgFe/mL was not measured by MRI.
