Clinical study using novel endoscopic system for measuring size of gastrointestinal lesion.

Aim: To verify the performance of a lesion size measurement system through a clinical study.

Methods: Our proposed system, which consists of a conventional endoscope, an optical device, an optical probe, and a personal computer, generates a grid scale to measure the lesion size from an endoscopic image. The width of the grid scale is constantly adjusted according to the distance between the tip of the endoscope and lesion because the lesion size on an endoscopic image changes according to the distance.