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. 2022 May 23;20:240. doi: 10.1186/s12951-022-01441-6

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — In vitro MRI and fluorescence imaging of MPG NPs. A MRI and fluorescence imaging of different concentrations of Mn₃O₄@PDA NPs and MPG NPs. B MRI relaxation rate and fluorescence intensity of Mn₃O₄@PDA NPs and MPG NPs at different concentrations. C MRI of different concentrations of MPG NPs at different pH values. D MRI relaxation rate of MPG NPs at different concentrations and different pH values. E MRI of different concentrations of MPG NPs with H₂O₂ at different pH values. F MRI relaxation rate of MPG NPs with H₂O₂ at different concentrations and different pH values. G MRI of different concentrations of MPG NPs with or without GSH. H MRI relaxation rate of MPG NPs with or without GSH at different concentrations