Skip to main content
. 2021 Jul 16;19:212. doi: 10.1186/s12951-021-00920-6

Fig. 2.

Fig. 2

The factors impacting the optical signal intensity of interaction. a,b, optical images (a) and quantitative analysis (b) displayed that the size and surface modification of the NPs affected the optical signal intensity. c, d the optical signal intensity is in inverse proportion to the interaction distance between Gd2O3:Eu-100/ Eu2O3 and 18F-FDG. e, f the optical signal intensity is in direct proportion to the radioactivity of 18F-FDG. g, h the optical signal intensity is in direct proportion to the mass of the Gd2O3:Eu/ Eu2O3