Fig. 1From: Size effect of Au/PAMAM contrast agent on CT imaging of reticuloendothelial system and tumor tissueSynthetic scheme and characteristics of Au-based CT contrast agents with gradient sizes. a Synthesis of PAMAM-entrapped Au. b–d TEM of Au nanoparticles in 22.2 ± 3.1, 54.2 ± 3.7, and 104.9 ± 4.7 nm. e Typical example of PAMAM-entrapped Au. f Size distributions of Au with three distinct sizesBack to article page