Thin-Shelled PEGylated Perfluorooctyl Bromide Nanocapsules for Tumor-Targeted Ultrasound Contrast Agent

Figure 4

Representative cryo-TEM images of nanocapsule (PLGA: gray; PFOB: black) with various initial total polymer amount: (a) NCm20, (b) NCm40, and (c) NCm100. Nanocapsules with very thin shell are pointed with white arrowheads.