Design of a system combining narrow band illuminants and a color camera for early diagnosis of skin flap necrosis

Yoko Kurabuchi; Kazuya Nakano; Takashi Ohnishi; Toshiya Nakaguchi; Shinsuke Akita; Markku Hauta-Kasari; Hideaki Haneishi

doi:10.1117/12.2576782

5 March 2021 Design of a system combining narrow band illuminants and a color camera for early diagnosis of skin flap necrosis

Yoko Kurabuchi, Kazuya Nakano, Takashi Ohnishi, Toshiya Nakaguchi, Shinsuke Akita, Markku Hauta-Kasari, Hideaki Haneishi

Author Affiliations +

Proceedings Volume 11631, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XIX; 116310R (2021) https://doi.org/10.1117/12.2576782
Event: SPIE BiOS, 2021, Online Only

Abstract

In plastic surgery, free tissue graft procedures are an essential part of fixing tissue-lack injuries or diseases. However, tissue necrosis caused by vascular occlusions or poor vascular anastomosis is a severe problem for prognosis. Follow-up surgery in the early-stage of necrosis caused by congestion or ischemia is essential to salvage the tissue, but making a diagnosis is difficult because of the slight features of these states. Therefore, a diagnosis support system that can capture the features of blood circulation of the skin flap is required to improve prognosis. We focused on system design and analysis by using spectral characteristics of blood circulation of a skin flap for this purpose. The system to be constructed is composed of a two-channel narrow-band illuminant and a color camera and can capture six-channel spectral signals. The narrow-band illuminant is designed by combining 13 kinds of light-emitting diode (LED) spectra. In this study, we first measured reflectance spectra of the early-stage skin flap necrosis of the rat model to design the narrow-band illuminant spectra. We blocked the flow of the target vessel and observed necrosis progression. A prototyped skin flap chamber was used for stable observation of spectral reflectance measurements. An evaluation experiment was conducted using a color camera and the spectrally tunable light source. Skin flap images were captured under the designedilluminants and a conventional illuminant reproduced by the spectrally tunable light source. We confirmed the effectiveness of the designed system by improvements in necrosis region detection.

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Yoko Kurabuchi, Kazuya Nakano, Takashi Ohnishi, Toshiya Nakaguchi, Shinsuke Akita, Markku Hauta-Kasari, and Hideaki Haneishi "Design of a system combining narrow band illuminants and a color camera for early diagnosis of skin flap necrosis", Proc. SPIE 11631, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XIX, 116310R (5 March 2021); https://doi.org/10.1117/12.2576782

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