Table 1.

Comparison of several contrast-enhancement imaging modalities.

Modality	Illumination (discrete wavelength, nm)		Detection range
	Band 1	Band 2	Surface	Middle layer	Deeper layer (>10 mm)
NBI	405–425	530–550	✔	✔	✘
RDI	595–600	620–640	✔	✔	✔
AFI	390–470	540–560	✔	✘	✘
IRI	790–820	905–970	✔	✔	✔
Modality	Illumination (continuous wavelength, nm)		Detection range
	Peak 1	Peak 2	Surface	Middle layer	Deeper layer (>10 mm)
BLI	400	450	✔	✔	✘
i-scan OE	400–450	500–550	✔	✔	✘