Design of a system combining narrow band illuminants and a color camera for early diagnosis of skin flap necrosis
Design of a system combining narrow band illuminants and a color camera for early diagnosis of skin flap necrosis
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DOI：
10.1117/12.2576782
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Yoko Kurabuchi;Kazuya Nakano;T. Ohnishi;T. Nakaguchi;Shinsuke Akita;M. Hauta-Kasari;H. Haneishi
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文献类型：
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作者：
Yoko Kurabuchi;Kazuya Nakano;T. Ohnishi;T. Nakaguchi;Shinsuke Akita;M. Hauta-Kasari;H. Haneishi
在整形外科手术中，游离组织移植手术是修复组织缺失损伤或疾病的重要组成部分。然而，血管闭塞或血管吻合不良引起的组织坏死是影响预后的严重问题。由于充血或缺血引起的早期坏死的后续手术对于挽救组织是必不可少的，但由于这些状态的轻微特征，做出诊断是困难的。因此，需要一种能够捕捉到皮瓣血循环特征的诊断支持系统来改善预后。为此，我们利用皮瓣血液循环的光谱特性进行了系统的设计和分析。该系统由双通道窄带光源和彩色摄像机组成，可采集6路光谱信号。结合13种发光二极管(LED)光谱设计了窄带光源。在本研究中，我们首先测量了大鼠早期皮瓣坏死模型的反射光谱，以设计窄带光源光谱。我们阻断了靶血管的血流，并观察到坏死进展。利用样机皮瓣室稳定观测光谱反射率测量结果。利用彩色相机和光谱可调光源进行了评价实验。在设计的光源和常规光源下拍摄的皮瓣图图像由光谱可调光源重现。通过对坏死区检测的改进，验证了所设计系统的有效性。
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.