Figure 1.

The experimental setup. (A) Photograph of the diaphragm phantom and the setup of the ultrasound probe. (B) Photograph of the ball representing the abdominal phantom. (C) Schematic of the lung phantom (21). The outermost layer “1” was a latex balloon representing the lung outer skin, the middle layer “1-2” was sponge representing the lung structure, and the inner core layer “1-1” was an elastic ball to simulate the lung tumor. The outer shell “2” was constructed of acrylic and filled with water.