Clinical Application of Wearable Magnet Tracking System for Capsule Endoscopes

Inclusion Criteria: * aged between 18 and 75 * agree to give written informed consent Exclusion Criteria: * dysphagia or symptoms of gastric outlet obstruction, suspected or known intestinal stenosis, overt gastrointestinal bleeding, history of upper gastrointestinal surgery or abdominal surgery altering gastrointestinal anatomy, or postabdominal radiation * congestive heart failure, renal insufficiency, under therapeutic anticoagulation, in poor general condition (American Society of Anesthesiologists class III/IV), claustrophobia, metallic parts, a pacemaker or other implanted electromedical devices, or artificial heart valves * pregnancy or suspected pregnancy * exclusion criteria for standard magnetic resonance imaging examination such as the presence of surgical metallic devices, even though its low magnetic field technically would not interferewith such devices * currently participating in another clinical study