NBI displays enhanced images of capillaries in the mucosal surface and detailed mucosal texture by irradiating two narrow wave bands (390–445 nm/530–550 nm) which are strongly absorbed by circulating hemoglobin. If signal processing is performed using a pseudo-narrow band image, the state of mucosa tissues and observation conditions influence the results and good effects cannot be obtained. However, with NBI, the wavelength of the irradiating light itself is altered, and capillaries in the mucosal surface and detailed mucosal texture can thus be processed effectively and stably.
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