NBI changes the white light normally emitted by the colonoscope to a bluish light, proiding a narrower waelength and enhancing isual contrast of the surface structure of the colon.

• 窄带成像技术将结肠镜常规发射的白光改变为蓝光，以此提供一个较窄的波长，加强结肠表面结构的视觉对比度。