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In vivo relative a) UCL, b) MR, and c) CT signals of SW480 tumor‐ and HCT116 tumor‐bearing nude mice after intravenous injection of UCNP@SiO2—COOH and UCNP@SiO2–UEA‐I at different timed intervals, respectively (the 0 h means preinjection). The error bars are standard deviations (n = 3. The significance of data is analyzed according to one‐sided paired Student's t‐test: *p < 0.05, **p < 0.01, and ***p < 0.001).
