It is a single center, prospective and self-controlled trial. We'd like to explore a new method by changing position to reduce gastric missing areas in Capsule Endoscopy(CE)

Background:Capsule endoscopy is widely used to observe small intestine.While it may miss important areas in stomach，especially in fundus.So far,physicians have no methods to observe stomach without no-missing areas by capsule endoscopy.

Objective:To explore a new method to reduce the areas missed by CE.

Methods:Subjects were prospectively enrolled.Every subjects will undergo 2 capsule endoscopies and 1 gastroscope.First capsule endoscopy,every subject have a better gastric preparation before swallowing CE and change position during the procedure.Second capsule endoscopy,every subject have a conventional CE. And then, every subject have a gastroscope.

Measurements:The primary measurements included safety, gastric preparation, visualization of gastric mucosa and rate of lesion detection.

Inclusion Criteria:

• Subjects don't have swallowing difficulties, motility disorders, or a medical history that included abdominal surgery or obvious gastrointestinal strictures are included.

Exclusion Criteria:

• Subjects with swallowing difficulty, motility disorders, diabetes, life-threatening conditions, mental disorders, or patients that could be pregnant, have a cardiac pacemaker, electrical implant, or any other condition that would preclude compliance with the study requirements and/or device instructions are excluded from the study.