New imaging technologies in the detection of colitis related colon cancer

Interventions: Patients undergo standard colonoscopy until the caecum is reached. Only a single colonoscopy will be performed on each patient (one-off).
Once the caecum is reached, all patients undergo sequential examination of colonic segments (as defined by the hepatic and splenic flexures) initially by NBI and then by chromoendoscopy.
The NBI and chromoendoscopy examinations are undertaken by two independent endoscopists.
NBI is activated by selecting a button on the standard colonoscope. It is then deactivated at the end of the examination of that segment.
There are no time limits imposed on the examination times however typically each examination takes 2-3minutes to examine.
Primary outcome(s): Diagnostic yield for dysplasia[At conclusion of the colonoscopy, the diagnostic yield for dysplasia will be measured for NBI and chromoendoscopy.]
Study Design: Purpose: Diagnosis; Allocation: Non-randomised trial