The CEST signal of SA/PFP@HP-PLLA NPs showed a trend of increasing and then decreasing within the range of pH 6.0~7.5 Figure 15e–g .
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Preparation of Hematoporphyrin-Poly(Lactic Acid) Nanoparticles Encapsulated Perfluoropentane/Salicylic Acid for Enhanced US/CEST MR Bimodal Imaging.
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