Quantitative Bowel Readiness Assessment System in Predicting the Missed Detection Rate of Adenomas

Inclusion Criteria: At least 4 operators were included in this study, and the operating years of colonoscopy were ≥ 5 years, and the number of independent operating cases was ≥ 3000. Subjects who meet all of the following specific criteria will be considered for participation in the study: 1. Male or female with age ≥ 45 years inclusive; 2. Able to read, understand and sign informed consent; 3. The investigator believes that the subjects can understand the process of the clinical study, are willing and able to complete all study procedures and follow-up visits, and cooperate with the study procedures. Exclusion Criteria: Subjects who meet any of the following specific criteria will be refused to participate in the study: 1. have a history of drug or alcohol abuse or psychological disorders within the last 5 years; 2. Pregnant or lactating women; 3. Patients with known multiple polyp syndrome; 4. patients with known inflammatory bowel disease; 5. known intestinal stenosis or space-occupying tumor; 6. known colon obstruction or perforation; 7. patients with a history of colorectal surgery; 8. Patients with previous history of allergy to pre-used spasmolysis; 9. Unable to perform biopsy and polyp removal due to coagulation disorders or oral anticoagulants; 10. High risk diseases or other special conditions that the investigator considers the subject unsuitable for participation in the clinical trial.