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. 2021 Feb 1;11(2):354. doi: 10.3390/nano11020354

Table 2.

Longitudinal relaxivity r1 for different paramagnetic inorganic NPs under different MRI operating conditions

Size nm r1/Mn+ mM−1.s−1 T °C B0 T Ref.
MnO spheres 7
20
0.37
0.13
25 3.0 [49]
MnO hollow spheres 20 1.15 25 1.5 [56]
Mn3O4 spheres 9.8 1.31 25 3.0 [48]
Mn3O4 platelets 10 2.06 25 3.0 [48]
Gd2O3 particles 5 9.2 21–23 1.5 [52]