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. 2015 Apr 29;9:2409–2419. doi: 10.2147/DDDT.S77790

Figure 1.

Figure 1

Transmission electron micrograph of plain gas-filled microbubble (A). Pixel gray values (B) are measured along the yellow line. Note that the hard shell is from 400 to 800 nm, while the soft shell is from 800 to 1,000 nm.