TLDR The new automatic tool accurately measures hair thickness and is reliable.
In 2011, a study evaluated a new automatic phototrichogram system with a high-resolution DSLR camera and pattern recognition software for measuring hair diameters. The system aimed to provide precise hair thickness measurements using an alternative immersion fluid to minimize hair swelling. The results indicated that the automatic measurements correlated highly with manual measurements, with over 90% correlation for the same hairs and at least 80% when comparing automatic results with manual measurements of the same images. The study confirmed the system's reliability and precision, with a mean error of ±4µm for manual analysis and high reproducibility (intra-assay variability >95%) and consistency in hair orientation. The ZETA image analysis tool, trained for this system, showed a very good correlation with manual analysis (R² = 0.926). The automated method could reduce costs and workload in cosmetic hair growth studies.
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January 2021 in “Plastic and Aesthetic Research” Hair loss reduces hair thickness and coverage, but drug treatments mainly revive dormant hairs rather than reverse thinning; patients often undervalue their hair loss severity.
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April 2012 in “British Journal of Dermatology” Caucasian women's hair appears thickest in their 20s, with perceived thinning after mid-30s due to both decreasing density and diameter.
July 2024 in “Experimental Dermatology” AP collagen peptides help hair grow and improve hair health.
