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Belikov A.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Gelfond M.L.,Nn Petrov Scientific Research Institute Of Oncology | Shatilova K.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Sosenkova S.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | And 2 more authors.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2016

Results of nevus, papilloma, dermatofibroma, and basal cell skin cancer in vivo removal by a 980±10 nm diode laser with "blackened" tip operating in continuous (CW) mode and automatic power control (APC) mode are presented. The collateral damage width and width of graze wound area around the collateral damage area were demonstrated. The total damage area width was calculated as sum of collateral damage width and graze wound area width. The mean width of total damage area reached 1.538±0.254 mm for patient group with nevus removing by 980 nm diode laser operating in CW mode, papilloma -0.586±0.453 mm, dermatofibroma -1.568±0.437 mm, and basal cell skin cancer -1.603±0.613 mm. The mean width of total damage area reached 1.201±0.292 mm for patient group with nevus removing by 980 nm diode laser operating in APC mode, papilloma -0.413±0.418 mm, dermatofibroma -1.240±0.546 mm, and basal cell skin cancer -1.204±0.517 mm. It was found that using APC mode decreases the total damage area width at removing of these nosological neoplasms of human skin, and decreases the width of graze wound area at removing of nevus and basal cell skin cancer. At the first time, the dynamic of output laser power and thermal signal during laser removal of nevus in CW and APC mode is presented. It was determined that output laser power during nevus removal for APC mode was 1.6±0.05 W and for CW mode -14.0±0.1 W. This difference can explain the decrease of the total damage area width and width of graze wound area for APC mode in comparison with CW mode. © 2016 SPIE.


Belikov A.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Gelfond M.L.,Nn Petrov Scientific Research Institute Of Oncology | Shatilova K.V.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Sosenkova S.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Lazareva A.A.,Saint Petersburg State University of Information Technologies, Mechanics and Optics
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2015

Results of nevus, papilloma, dermatofibroma, and basal cell skin cancer removal by a 980±10 nm diode laser with "blackened" tip operating in continuous (CW) mode and automatic power control (APC) mode are compared. It was demonstrated that using APC mode decreases the width of collateral damage at removing of these nosological neoplasms of human skin. The mean width of collateral damage reached 0.846±0.139 mm for patient group with nevus removing by 980 nm diode laser operating in CW mode, papilloma - 0.443±0.312 mm, dermatofibroma - 0.923±0.271 mm, and basal cell skin cancer - 0.787±0.325 mm. The mean width of collateral damage reached 0.592±0.197 mm for patient group with nevus removing by 980 nm diode laser operating in APC mode, papilloma - 0.191±0.162 mm, dermatofibroma - 0.476±0.366 mm, and basal cell skin cancer - 0.517±0.374 mm. It was found that the percentage of laser wounds with collateral damage less than 300 μm of quantity of removed nosological neoplasms in APC mode is 50%, that significantly higher than the percentage of laser wounds obtained using CW mode (13.4%). © COPYRIGHT SPIE-OSA.

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