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

Figure 8 Average backscatter intensity as a function of silica nanospheres diameter for pure silica nanospheres. A: Pure SiNS; B: FePt-IO coated-SiNS; C: IO-coated SiNSs, at the three investigated ultrasound frequencies. Values of average backscatter intensity are expressed in dB in order to better emphasize lowest values. 0-control point value is obtained from pure agarose gel sample. SiNSs: Silica nanospheres; Pure: Uncoated SiNSs; FePt-IO: Ferrum platinum-iron oxide; IO: Iron oxide.