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. 2019 Apr 3;9(4):541. doi: 10.3390/nano9040541

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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T_1w- and T_2w-MRI phantom images and T₂ relaxation maps (25 °C, 3 T): (A) SPIONs in water (B) SPIONs incorporated into hydrogel 7 (0.8 wt%); (C) SPIONs incorporated into hydrogel 8 (0.8 wt%). The T₂-MRI relaxation map was acquired using the MEMS (multi-echo-multi-spin) sequence.