Slide-free clinical imaging of melanin with absolute quantities using label-free third-harmonic-generation enhancement-ratio microscopy

The capability to image the 3D distribution of melanin in human skin in vivo with absolute quantities and microscopic details will not only enable noninvasive histopathological diagnosis of melanin-related cutaneous disorders, but also make long term treatment assessment possible. In this paper, we...

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Veröffentlicht in:Biomedical optics express 2020-06, Vol.11 (6), p.3009-3024
Hauptverfasser: Sun, Chi-Kuang, Wu, Pei-Jhe, Chen, Sheng-Tse, Su, Yu-Hsiang, Wei, Ming-Liang, Wang, Chiao-Yi, Gao, Hao-Cheng, Sung, Kung-Bing, Liao, Yi-Hua
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container_issue 6
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container_title Biomedical optics express
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creator Sun, Chi-Kuang
Wu, Pei-Jhe
Chen, Sheng-Tse
Su, Yu-Hsiang
Wei, Ming-Liang
Wang, Chiao-Yi
Gao, Hao-Cheng
Sung, Kung-Bing
Liao, Yi-Hua
description The capability to image the 3D distribution of melanin in human skin in vivo with absolute quantities and microscopic details will not only enable noninvasive histopathological diagnosis of melanin-related cutaneous disorders, but also make long term treatment assessment possible. In this paper, we demonstrate clinical in vivo imaging of the melanin distribution in human skin with absolute quantities on mass density and with microscopic details by using label-free third-harmonic-generation (THG) enhancement-ratio microscopy. As the dominant absorber in skin, melanin provides the strongest THG nonlinearity in human skin due to resonance enhancement. We show that the THG-enhancement-ratio (erTHG) parameter can be calibrated in vivo and can indicate the melanin mass density. With an unprecedented clinical imaging resolution, our study revealed erTHG-microscopy’s unique capability for long-term treatment assessment and direct clinical observation of melanin’s micro-distribution to shed light into the unknown pathway and regulation mechanism of melanosome transfer and translocation.
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title Slide-free clinical imaging of melanin with absolute quantities using label-free third-harmonic-generation enhancement-ratio microscopy
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