Magnetically-coated silica nanospheres for dual-mode imaging at low ultrasound frequency

Figure 5 Examples of ultrasound image backscatter determined by pure and nanocomposite (with either ferrum platinum-iron oxide or iron oxide) 660 nm silica nanospheres at maximum and minimum used insonification frequency. A: Pure SiNSs, 4.5 MHz; B: FePt-IO-coated SiNSs, 4.5 MHz; C: IO-coated SiNSs, 4.5 MHz; D: Pure SiNSs, 2.5 MHz; E: FePt-IO-coated SiNSs, 2.5 MHz; F: IO-coated SiNSs, 2.5 MHz; G: Pure agarose gel. SiNSs: Silica nanospheres; Pure: Uncoated SiNSs; FePt-IO: Ferrum platinum-iron oxide; IO: Iron oxide.