Fig. 2
a TEM images and b corresponding hydrodynamic size changes (blue, 15 min; red, 30 min; green, 60 min) of FMS after treated with different pHs and GSH conditions. c, d Cumulative Mn2+ release curves of FMS at different c pH and d GSH concentrations. e T1WI and f corresponding r1 values of the FMS phantoms after different treatments under 3.0 T. g T2WI and h corresponding r2 values of the FMS phantoms after different treatments under 3.0 T