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Differentiating solar lentigines from post-inflammatory hyperpigmentation with hyperspectral imaging: A pilot study.

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Hyperspectral imaging (HSI) can differentiate solar lentigines from post-inflammatory hyperpigmentation (PIH) by analyzing colorimetric features and chromophore concentrations. PIH spots show higher hemoglobin content and specific color value differences compared to solar lentigines.

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chromophoresclaim substantiationhyperspectral imagingpost‐inflammatory hyperpigmentationskin physiologysolar lentiginesspectroscopystatistics

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Area of Science:

  • Dermatology
  • Medical Imaging
  • Biophysics

Background:

  • Solar lentigines and post-inflammatory hyperpigmentation (PIH) are common skin pigmentation disorders.
  • Accurate differentiation is crucial for effective dermatological treatment.
  • Current diagnostic methods rely on trained dermatologists' visual assessment.

Purpose of the Study:

  • To evaluate the efficacy of hyperspectral imaging (HSI) in characterizing and discriminating between solar lentigines and PIH.
  • To identify unique colorimetric features and chromophore concentrations associated with each condition.

Main Methods:

  • Hyperspectral imaging (HSI) was acquired using a liquid-crystal tuneable filter spectral scanning spectrometer.
  • The study included 11 female Japanese subjects with solar lentigines and 5 subjects with both solar lentigines and PIH.
  • Quantitative analysis focused on differences in oxyhaemoglobin, deoxyhaemoglobin, melanin, and colorimetric values (L*, a*, b*) relative to surrounding skin.

Main Results:

  • Significant differences were observed in ΔOxyhaemoglobin, ΔDeoxyhaemoglobin, Δa*, and Δb* values between PIH spots and solar lentigines (p < 0.05).
  • PIH spots exhibited higher haemoglobin content and Δa* values, along with lower Δb* values compared to solar lentigines.
  • No significant differences were found in ΔL* values or ΔMelanin content between the two types of hyperpigmentation.

Conclusions:

  • Hyperspectral imaging (HSI) shows potential in differentiating solar lentigines from PIH based on distinct chromophore and colorimetric profiles.
  • PIH spots are characterized by increased hemoglobin and specific color shifts (higher a*, lower b*) compared to solar lentigines.
  • Further clinical studies with larger cohorts are recommended to validate HSI's utility in supporting clinical assessment for these pigmentation disorders.