Efficacy of 810 nm diode laser in hair reduction in Indian subpopulation using a novel Gabor filter-based detection software and hair algorithm

Pai, Sathish B and Suvarna, Punya and Shetty, Varsha M and Pathan, Sameena (2021) Efficacy of 810 nm diode laser in hair reduction in Indian subpopulation using a novel Gabor filter-based detection software and hair algorithm. Journal of Cosmetic Dermatology, 21. pp. 10041-1012. ISSN 1473-2130

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Abstract

Diode laser (810 nm) is frequently employed for hair reduction. There are few studies determining the efficacy in Indian population. Objectives: Assessment of efficacy and safety of 810 nm diode laser in facial/axillary hair reduction and objective assessment of the improvement with dermoscopy, pho�tographs, and novel Gabor filter-based hair detection algorithm. Methodology: This hospital-based study included 40 adult women with 108 treat�ment sites over 5.4 sessions (range 4–8). Evaluation of treatment areas (hair texture, density) was done using modified Ferriman–Galwey scoring. Photography and dermo�scopic images were taken before each session and 6 weeks after the last. Immediate and delayed adverse reactions were noted. Assessment of efficacy was done by pa�tient, principal, and blinded investigator using Global Aesthetic Improvement scale (GAIS) and hair detection algorithm (evaluating characteristics of dermoscopic hair). Results: The fluences ranged from 16 to 29 Joules/cm2 with pulse width of 30 ms. Upper lip (n = 29, 26.9%) and chin (n = 25, 22.1%) were commonly treated areas. Improvement in hair texture and density (reduction in uniformly distributed, terminal hair from 37.1% to 13.9%) was statistically significant (p < 0.0001). Excellent improve�ment of 75–100% (GAIS) was noted by principal and blinded investigator in 24.1% and 33.3% total sites, respectively. The median improvement, calculated by the algorithm, was 60% for side locks, 53.9% for xilla, 24.1% for upper lip, and 14.9% for chin. Axilla and upper lip were sites associated with maximum discomfort. Epidermolysis and par�adoxical hypertrichosis were seen in five patients each. Conclusion: The 810 nm diode laser is safe and effective in the reduction of dark, coarse terminal hairs in Fitzpatrick skin types III–V. Inter-observer variation and in�vestigator bias in the assessment of efficacy can be successfully overcome by using the algorithm.

Item Type: Article
Uncontrolled Keywords: darker skin, diode laser, hair detection software, Indian subpopulation, laser hair reduction
Subjects: Engineering > MIT Manipal > Information and Communication Technology
Depositing User: MIT Library
Date Deposited: 23 Jun 2022 05:16
Last Modified: 23 Jun 2022 05:16
URI: http://eprints.manipal.edu/id/eprint/158841

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