Abstract
Characteristics such as skin tone and pigmentation color vary among patients, but most researches on laser irradiation in laser ablation have revolved around minimizing damage to reduce pain. Chromophores are the most important factors in photon energy absorption, a key principle of laser ablation. We investigated the influences on ablation depth by different chromophores on the target and modulating duration per laser exposure using an Nd:YVO4 nanosecond 532-nm laser. We used a Fourier-domain optical coherence tomography (Fd-OCT) system combined with a 532-nm Nd:YVO4 laser to observe the ablation process. In addition, an external customized shutter and water-based color pens (red, green, blue, black) were used to determine the effects of modulating the duration per laser exposure and coloring chromophores on porcine skin and hairless mouse models. Experiments with modulating duration per laser exposure demonstrated that shorter duration generated shallower craters than longer one. Painted experimental group showed damaged region as craters in the experiments with coloring various chromophores. In this research, we investigated the effects of modulating duration per laser exposure and different chromophores on the target. Coloring chromophores with water-based dyes using pens increased tissue damage without dyeing cells or tissue.
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Funding
This research was financially supported in INHA UNIVERSITY Research Grant (INHA-55436). The laser used in these studies was provided by Dong Jun Shin (EO Technics Co., Ltd., Anyang, South Korea). This work was presented at the 2017 SPIE Photonics West conference.
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Hang Chan Jo designed and performed the experiments, analyzed the data, and wrote the paper. Dae Yu Kim conceived and designed the experiments, supervised the work, and revised the paper.
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Experiments using hairless mouse were approved by the institutional animal care and use committee (IACUC) of Dankook University.
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The authors declare that they have no conflict of interest.
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Jo, H.C., Kim, D.Y. Observations of in vivo laser tissue ablation in animal models with different chromophores on the skin and modulating duration per laser exposure. Lasers Med Sci 34, 1031–1039 (2019). https://doi.org/10.1007/s10103-018-2693-4
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DOI: https://doi.org/10.1007/s10103-018-2693-4