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. 2018 May 11;8(12):3284–3307. doi: 10.7150/thno.25220

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T₁-weighted MR images of different IONPs. (A) r₁ value and r₂/r₁ ratio of ES-MIONs as a function of particle size.. (B) T₁-weighted MR images of a mouse injected with ZDS-coated exceedingly small SPIONs (ZES-SPIONs) at 7 T. (C) T₁-weighted MRA of a mouse injected with ZES-SPIONs at 7 T. (A, B) Reproduced with permission from ¹⁸, copyright 2017. (C) Reproduced with permission from ¹³⁵, copyright 2017.