Contrast Enhanced Phototrichogram: An Improved Non-Invasive Technique for Measurement of Scalp Hair Dynamics in Androgenetic Alopecia – Validation Study with Histology After Transverse Sectioning of Scalp Biopsies

June 2001 in “ PubMed ”

D. Van Neste

contrast enhanced phototrichogram CE-PTG phototrichogram PTG androgenetic alopecia AGA hair dynamics scalp hair hair fibers miniaturized hair hair growth stages hair follicles hair cycling

TLDR CE-PTG is a better method for analyzing hair growth in androgenetic alopecia.

The study validated the contrast enhanced phototrichogram (CE-PTG) as an improved non-invasive technique for measuring scalp hair dynamics in androgenetic alopecia (AGA). CE-PTG significantly enhanced the detection of both thin and thick hair compared to the traditional phototrichogram (PTG). It was comparable to histology in identifying hair fibers, including severely miniaturized ones, and could observe all hair growth stages. However, staging severely affected hair follicles remained challenging for both CE-PTG and histology. The study concluded that CE-PTG is a superior method for detailed analysis of hair cycling in AGA.

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