Analytic parallel‐polarized light imaging technique using various light‐emitting diodes: a comparison with skin conductance values

Kim, Dai Hyun; Choi, Jungkyu; Ryu, Hwa Jung; Seo, Soo Hong; Kye, Young Chul; Ahn, Hyo Hyun

doi:10.1111/srt.12172

Cited by 5 publications

(5 citation statements)

References 14 publications

(21 reference statements)

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“…8 According to another study using LED illuminators of various colors, the green LED illuminator yielded more accurate and objective skin image data. 9 Thus, we chose to use the green LED illuminator as the light source in our study. We also used the conventional white LED illuminator in the study to compare the effectiveness of both green and white light.…”

Section: Discussionmentioning

confidence: 99%

An assessment method for dermal structures using cross‐polarized light imaging with a green light‐emitting diode

Hong

Park

Ham

et al. 2020

Skin Research and Technology

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Background: Several experimental methods for evaluating dermal structures exist; however, most of these are not used in dermatology clinics because of cost and functional limitations. Objective: To propose a simple, non-invasive method for dermal structure evaluation using a green light-emitting diode (LED) with cross-polarized light (CPL) imaging and compare the quality of the images taken using either green or white LED. Materials and Methods: Skin specimens were taken from fifteen cadavers. Images were captured using CPL photography with a green or white LED. The Commission International d'Eclairage L*a*b* (CIELAB) values were calculated for each image. The skin specimens were processed and stained with Masson's trichrome to visualize collagen fibers with major image scattering. The images were histologically analyzed, and correlational and regression analyses were performed to determine the relationship between the L* values and histologic measurements. Results: The L* values for the green images were positively correlated with collagen fiber density, reticular collagen bundle diameter, and dermal thickness. They were effective for estimating dermal properties. The L* values for the white images were positively correlated with reticular collagen bundle diameter and dermal thickness. Correlational coefficients for white images were lower than those for green images. In regression analysis, green images showed a higher coefficient of determination (R 2) for predicting reticular collagen bundle diameter than white images (0.1128 vs. 0.0827). Conclusion: Cross-polarized light imaging with a green LED is a simple, non-invasive method for evaluating dermal structures. The use of a green LED was also more effective for image analysis.

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Section: Discussionmentioning

confidence: 99%

An assessment method for dermal structures using cross‐polarized light imaging with a green light‐emitting diode

Hong

Park

Ham

et al. 2020

Skin Research and Technology

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“…Parallel-polarized light (PPL) photography is a method that can objectively evaluate reflections from the skin surface1. A preliminary study with various skin diseases indicated that PPL photography images taken with green light emitting diodes (LEDs) might be useful for analyzing specific diseases such as atopic dermatitis, rosacea, and xerotic dermatitis2.…”

Section: Introductionmentioning

confidence: 99%

Rosacea Subtypes Visually and Optically Distinct When Viewed with Parallel-Polarized Imaging Technique

et al. 2017

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BackgroundParallel-polarized light (PPL) photography evaluates skin characteristics by analyzing light reflections from the skin surface.ObjectiveThe aim of this study was to determine the significance of quantitative analysis of PPL images in rosacea patients, and to provide a new objective evaluation method for use in clinical research and practice.MethodsA total of 49 rosacea patients were enrolled. PPL images using green and white light emitting diodes (LEDs) were taken of the lesion and an adjacent normal area. The values from the PPL images were converted to CIELAB coordinates: L* corresponding to the brightness, a* to the red and green intensities, and b* to the yellow and blue intensities.ResultsA standard grading system showed negative correlations with L* (r=−0.67862, p=0.0108) and b* (r=−0.67862, p=0.0108), and a positive correlation with a* (r=0.64194, p=0.0180) with the green LEDs for papulopustular rosacea (PPR) types. The xerosis severity scale showed a positive correlation with L* (r=0.36709, p=0.0276) and a negative correlation with b* (r=−0.33068, p=0.0489) with the white LEDs for erythematotelangiectatic rosacea (ETR) types. In the ETR types, there was brighter lesional and normal skin with white LEDs and a higher score on the xerosis severity scale than the PPR types.ConclusionThis technique using PPL images is applicable to the quantitative and objective assessment of rosacea in clinical settings. In addition, the two main subtypes of ETR and PPR are distinct entities visually and optically.

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“…Age‐associated skin color changes may be studied using colorimetric analyses using the CIE L * a * b * system (Kikuchi et al, ; de Rigal et al, ; Kim et al, ); our previous studies reported a significant correlation between colorimetric values and age (Kim et al, ). However, the extant literature does not document a correlation between skin color modifications and histologic findings, according to individual age.…”

Section: Introductionmentioning

confidence: 99%

Relationship between skin color and solar elastosis in aged Asian skin: A colorimetric–pathologic correlation

Kim

Oh²,

Kwon

et al. 2017

Microscopy Res & Technique

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Aged skin is reported to be associated with unattractive skin color changes and solar elastosis. However, comparative studies have not documented the possible correlation between the two factors. This study investigated the plausible relationship between the facial skin color of elderly Asians and solar elastosis. A total of 22 skin specimens were collected from 22 Korean patients who underwent cheek skin biopsies. Skin color was quantitatively measured using colorimetric photography techniques to produce CIE L*a*b* values; the degree of solar elastosis was quantifiably assessed using a histologic grading scale. These values were used to investigate a correlation between the CIE L*a*b* coordinates and solar elastosis grade. The solar elastosis grade increased according to patient age (r = 0.67, p = .0006). However, the extent of solar elastosis was not statistically correlated with the CIE L*a*b* values, including L*, a*, and b* (r = 0.02, p = .95; r = 0.15, p = 0.50; r = -0.07, p = 0.76, respectively). The results showed that the solar elastosis grade increased, according to patient age, because of cumulative actinic damage. However, colorimetric skin color data did not correlate with the degree of solar elastosis. Therefore, cutaneous color changes and solar elastosis are separate, age-related phenomena. Physicians should be aware of the possible histologic changes in actinically damaged facial skin, regardless of the skin color.

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Analytic parallel‐polarized light imaging technique using various light‐emitting diodes: a comparison with skin conductance values

Cited by 5 publications

References 14 publications

An assessment method for dermal structures using cross‐polarized light imaging with a green light‐emitting diode

An assessment method for dermal structures using cross‐polarized light imaging with a green light‐emitting diode

Rosacea Subtypes Visually and Optically Distinct When Viewed with Parallel-Polarized Imaging Technique

Relationship between skin color and solar elastosis in aged Asian skin: A colorimetric–pathologic correlation

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