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In this study, we developed the ultrasmall magnetic CuFeSe2 nanoparticles for CT\/MR dual-modal imaging. By controlling the reaction time and condition, CuFeSe2 nanoparticles were synthesized by a simple directly aqueous method. After modification with copolymer methoxy polyethylene glycol-polycaprolactone (MPEG-PCL), the obtained MPEG-PCL@CuFeSe2 nanoparticles showed excellent water solubility, colloidal stability, and biocompatibility. In addition, they also exhibited superparamagnetism and X-ray\u2019s characteristics. 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