Clinical application of oral contrast-enhanced ultrasound in evaluating the preoperative T staging of gastric cancer

Figure 1 Oral contrast-enhanced ultrasound pattern chart of layers of the gastric wall. A: Gastric cancer T staging pattern chart; B: Oral contrast-enhanced ultrasound pattern chart; C: Gastric oral contrast-enhanced ultrasound (OCEUS) high-frequency ultrasound pattern chart; D: Gastric OCEUS low-frequency ultrasound pattern chart. OCEUS reveals three high and two low five-layer structures of the gastric wall. L1: Mucosal epithelium and gastric cavity interface echo layer (high echo); L2: Deep mucosa (low echo); L3: Submucosa (high echo); L4: Muscularis propria (low echo); L5: Serosa (high echo); STO: Stomach cavity (equal echo).