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Fig. 2 | BMC Gastroenterology

Fig. 2

From: Evaluation of dual-wavelength excitation autofluorescence imaging of colorectal tumours with a high-sensitivity CMOS imager: a cross-sectional study

Fig. 2

Classification of lesion brightness in autofluorescence ratio images. a. Fresh resected specimen. b. No-signal group: In comparison to normal mucosa, the lesion does not appear bright (ratio image of a). c. Fresh resected specimen. d. High-signal group: In comparison to normal mucosa, the lesion appears bright (ratio image of c)

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