fig5

Figure 5. Demonstration of the differential ultrasound imaging of the metagel film. (A) Simultaneous dual-frequency excitation of the zinc tablet, pure gel, and metagel. Ultrasound images are shown in (B) at 2 MHz, (C) at 6 MHz and (D) after differential processing. In the differential image, most of the interfering echoes other than those from the metagel film have been suppressed; (E-G) Statistical analysis of the differential imaging (n = 3); (E) Signal-to-noise ratio for 2 MHz B-mode/6 MHz B-mode/differential ultrasound imaging of zinc/pure gel/metagel; (F)Signal-to-noise ratio differential ultrasound imaging of the metagel film; (G) Contrast for 2 MHz B-mode/6 MHz B-mode/differential ultrasound imaging. Data are represented as mean value ± SD (standard deviation). Three independent tests were conducted (n = 3).