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김원석 ( Won-serk Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
1. Characteristics of Laser A. Monochromicity; Same wave length, determined by the laser medium B. Coherence; Traveling in phase; both in time & space C. Collimation; Parallel with no divergence, travels long distances without significant loss of intensity 2. Skin response by Laser A. Photo-vaporization; A lasers quickly heat the tissues to above 100˚C, water within the tissues boils and evaporates. Since 70% of the body tissue is water, the boiling change the tissue into a gas; CO2/Erbium-YAG B. Photocoagulation; A laser heating of tissues above 50oC but below 100oC induces disordering of proteins and other bio-molecules; Fractional L/NAR C. Photoacoustic/Photomechanical; Ultra-short pulse makes extremely rapid thermal expansion can lead to acoustic waves & subsequent destruction of the absorbing tissue; Q-switched laser D. Photochemical; Derive from native or photosensetizer-related reaction; LED, PDT 3. Thermal relaxation time; Most of the absorbed energy is converted to heat and diffuse into the surrounding tissue. Heat diffusion via conduction is also called thermal relaxation. The key to clean ablation of tissue is to ablate it quickly, before much heat is conducted into surrounding tissue. 4. Selective photothermolysis; Selective, localized heating (with focal destruction of “target” structures) is achieved by a combination of selective light absorption and a pulse duration shorter than or approximately equal to the TRT of the targets
Symposium 7-2 (SYP 7-2) : Clinical characteristics and diagnostic work-up
김원석 ( Won Serk Kim ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Ultraviolet radiation (UVR) induced various skin damage and skin cancers can develop by accumulated exposure of UVR. Basal cell carcinoma, squamous cell carcinoma and melanoma is well-known UVR-induced skin cancer, their clinical manifestations are relatively distinct and not difficult to diagnosis differentially, however sometimes resemble each other and also some benign lesions can be misdiagnosed as skin cancer. For more precise diagnosis, it’s important to understand clinical features of various skin cancers and also to manage various devices such as dermoscopy, wood light and skin analyzer which provide additional information.Until now, the final diagnostic tool of skin cancer is biopsy; however the demand of non-invasive diagnosis and screening of multiple lesions is increasing. This lecture introduces and summarizes clinical features of various skin cancers and diagnostic tools of them especially focused on non-invasive technique.
Laser Safety 2 (LS 2) : Laser basics and physics
김원석 ( Won Serk Kim ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
After Albert Einstein first conceptualized Laser in 1917, many laser systems have been developed and used. Unlike standard light sources, laser exhibits three unique characteristics, monochromacity, coherence and collimation. In 1983, “Theory of Selective Photothermolysis (This allowed the targeting of specific constituents of the skin without damaging the surrounding tissues)”was published and which is most important basic mechanisms of laser treatment in dermatologic field. In this lecture, basic concepts of wavelengths, pulse duration, and power in laser treatment and how can we realize selective photothermolysis by modulating these physical parameters will be introduced.
The effects of laser irradiation on wound healing and scar prevention
김원석 ( Won Serk Kim ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Scar is a bad cosmetic result which caused by abnormal wound healing process. For minimal scar formation, various methods have been used in each stage from wound to scar. Traditionally, Specialized dressing materials were used for fast wound recovery and silicone sheet for prevention of scar growth. Recently, laser irradiation is regarded as a promising tool to modulate wound healing process and scar formation. Especially, light-emitting diode laser (LED), fractional laser and pulsed dye laser (PDL) are well studied. Our aim for this study was to find effects and its mechanisms of various lasers on wound healing and scar. And we found many interesting things such as systemic effects of LED, mast cell modulation of LED, process of wound healing after fractional stimuli..etc.