Measurement of polyp size at colonoscopy: a proof-of-concept simulation study to address technology bias

We introduce a novel, proof-of-concept polyp measurement device for the design of future colonoscopes. In a simulation study, 50 expert endoscopists used three measurement strategies (method 1: no visual cues; method 2: a snare tip visual cue; method 3: a grid visual cue) to evaluate 120 images of 40 simulated polyps (1-10 mm) presented in random order. Measurement accuracies of each method were 20%, 33% and 90%, respectively (