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

Figure 7 Mean average backscatter intensity for the three different types of nanoparticle contrast agents at each considered silica nanospheres diameter. Backscatter values are expressed in dB. 0-control point is obtained from pure agarose gel phantom measurements. Each curve represents the mean value of the acoustical response for a specific nanoparticle contrast agents over the entire low frequency range (2.5-4.5 MHz). SiNSs: Silica nanospheres; Pure: Uncoated SiNSs; FePt-IO: Ferrum platinum-iron oxide; IO: Iron oxide.