https://scholars.lib.ntu.edu.tw/handle/123456789/484498
標題: | Validation of an inverse fitting method of diffuse reflectance spectroscopy to quantify multi-layered skin optical properties | 作者: | Wang, C.-Y. Kao, T.-C. Chen, Y.-F. Su, W.-W. Shen, H.-J. KUNG-BIN SUNG |
關鍵字: | Artificial neural network; Diffuse reflectance spectroscopy; Monte Carlo simulations; Skin optical properties | 公開日期: | 2019 | 卷: | 6 | 期: | 2 | 來源出版物: | Photonics | 摘要: | Skin consists of epidermis and dermis layers that have distinct optical properties. The quantification of skin optical properties is commonly achieved by modeling photon propagation in tissue using Monte Carlo (MC) simulations and iteratively fitting experimentally measured diffuse reflectance spectra. In order to speed up the inverse fitting process, time-consuming MC simulations have been replaced by artificial neural networks to quickly calculate reflectance spectra given tissue geometric and optical parameters. In this study the skin was modeled to consist of three layers and different scattering properties of the layers were considered. A new inverse fitting procedure was proposed to improve the extraction of chromophore-related information in the skin, including the hemoglobin concentration, oxygen saturation and melanin absorption. The performance of the new inverse fitting procedure was evaluated on 40 sets of simulated spectra. The results showed that the fitting procedure without knowing the epidermis thickness extracted chromophore information with accuracy similar to or better than fitting with known epidermis thickness, which is advantageous for practical applications due to simpler and more cost-effective instruments. In addition, the melanin volume fraction multiplied by the thickness of the melanin-containing epidermis layer was estimated more accurately than the melanin volume fraction itself. This product has the potential to provide a quantitative indicator of melanin absorption in the skin. In-vivo cuff occlusion experiments were conducted and skin optical properties extracted from the experiments were comparable to the results of previously reported in vivo studies. The results of the current study demonstrated the applicability of the proposed method to quantify the optical properties related to major chromophores in the skin, as well as scattering coefficients of the dermis. Therefore, it has the potential to be a useful tool for quantifying skin optical properties in vivo. © 2019 by the authors. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/484498 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067547828&doi=10.3390%2fphotonics6020061&partnerID=40&md5=551def7dd615b88f203e1486d6bc3197 |
ISSN: | 23046732 | DOI: | 10.3390/photonics6020061 |
顯示於: | 生醫電子與資訊學研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。