Transabdominal Gastric Contrast Ultrasound

Inclusion Criteria:

1. Age: 18\~80 years old, male or female;
2. Diagnosed with gastric cancer by histology or cytology;
3. No distant multiple metastasis;
4. ECOG score 0-2;
5. Heart, lung, liver and kidney function can tolerate surgery;
6. Patients and their families can understand and be willing to participate in this clinical study, and sign the informed consent.

Exclusion Criteria:

1. Previous history of malignant tumor or recent diagnosis combined with other malignant tumors;
2. Patients with gastrointestinal perforation, gastrointestinal bleeding, etc. requiring emergency surgery;
3. Patients with previous gastroduodenal surgery;
4. Preoperative neoadjuvant therapy;
5. Patients and their families refuse surgical treatment;
6. ASA grade ≥ IV and/or ECOG performance status score \> 2;
7. Patients with severe liver and kidney function, cardiopulmonary function, coagulation dysfunction or combined with serious underlying diseases who cannot tolerate surgery;
8. Have a history of serious mental illness;
9. Pregnant or lactating women;
10. Patients with other clinical and laboratory conditions considered by the researchers should not participate in this trial.