Investigation for gastrointestinal mucosa and submucosa using new endoscopic imaging technology (Dual Red Imaging)

Interventions: Diagnosis 80 cases, ESD 120 cases Period:From March 20 2014 until April 30 2016 We perform diagnosis or ESD of each case using DRI.
Primary outcome(s): 1.Improvement of diagnosis precision: Detection for lesion, Diagnosis of depth of cancer invasion, Assessment for the severity of inflammation. 2.Improvement for visualization of thick blood vessel and bleeding point during ESD. Shortening of total ESD procedure time.
Study Design: Single arm Non-randomized