Background and Aims
We aimed to clarify whether red dichromatic imaging (RDI), a new type of image-enhanced
endoscopy, improves the visibility of bleeding points in acute GI bleeding (AGIB)
compared with white-light imaging (WLI).
Methods
Images and videos of bleeding points acquired with WLI and RDI during endoscopic hemostasis
for AGIB were retrospectively compared. In images, the color difference between bleeding
points and surrounding blood was analyzed. In videos, 4 expert and 4 trainee endoscopists
evaluated the visibility on a scale of 1 (undetectable) to 4 (easily detectable).
Furthermore, the correlation between the color difference and visibility score was
evaluated.
Results
We analyzed 64 lesions. The color difference was significantly higher in RDI (13.11
± 4.02) than in WLI (7.38 ± 3.68, P < .001). The mean visibility score for all endoscopists was significantly higher
in RDI (3.12 ± .51) compared with WLI (2.72 ± .50, P < .001); this was also observed in experts (3.18 ± .51 vs 2.79 ± .54, P < .001) and trainees (3.05 ± .54 vs 2.64 ± .47, P < .001). The color difference and visibility score were moderately correlated for
all endoscopists (γ = .56, P < .001) and for experts (γ = .53, P < .001) and trainees (γ = .57, P < .001).
Conclusions
RDI improves the visibility of bleeding points in AGIB compared with WLI. RDI can
help endoscopists at all levels of experience to recognize bleeding points by enhancing
the color contrast relative to surrounding blood.
Abbreviations:
AGIB (acute GI bleeding), ESD (endoscopic submucosal dissection), NBS (National Bureau of Standards), RDI (red dichromatic imaging), ROI (region of interest), WLI (white-light imaging)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: November 08, 2021
Accepted:
October 24,
2021
Received:
August 10,
2021
Footnotes
DISCLOSURE: All authors disclosed no financial relationships. Research support for this study was provided by Olympus Co (Tokyo, Japan) in supplying the prototype endoscopes equipped with red dichromatic imaging.
If you would like to chat with an author of this article, you may contact Dr Fujimoto at [email protected]
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- Red dichromatic imaging in acute GI bleeding: Does it make a difference?Gastrointestinal EndoscopyVol. 95Issue 4
