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A Quantative Evaluation of Pigmented Skin Lesions Using The L*a*b* Color Coordinates

 Soo Chan Kim  ;  Deok Won Kim  ;  Joon Pio Hong  ;  Dong Kyun Rah 
 Yonsei Medical Journal, Vol.41(3) : 333-339, 2000 
Journal Title
Issue Date
Color* ; Female ; Hemangioma/pathology ; Hemangioma/therapy ; Humans ; Nevus of Ota/pathology ; Nevus of Ota/therapy ; Outcome Assessment (Health Care)/methods* ; Pigmentation Disorders/pathology* ; Pigmentation Disorders/therapy* ; Skin Neoplasms/pathology ; Skin Neoplasms/therapy ; Skin Pigmentation* ; Software*
Relative color difference ; hemangioma ; ota nevus ; treatment effect
The evaluation of pigmentary skin lesions by clinical doctors has been based on subjective and qualitative judgements. Observations have mostly relied on visual inspection, making the effects of treatment difficult to evaluate with any precision. For this reason there is a real need for an objective method to evaluate prognosis after treatment. Recent scientific measurements such as reflectance spectrophotometry and reflectance colorimetry have provided accurate quantitative color information about skin lesions, but these techniques are costly and difficult to apply in the clinical field. The purpose of this study was to develop a simple and cost-effective way of evaluating treatment results. We have developed a software program using the L*a*b* color coordinate system to quantify the effect of treatment and have successfully demonstrated its clinical usefulness. Our method compares the relative color difference between normal skin and skin lesions before and after treatment, instead of measuring the absolute color of skin lesions. The accuracy of our quantitative color analysis was confirmed by the simulated images of hemangioma and ota nevus. Clinical efficacy was also confirmed through a blind test involving 3 clinicians who were asked to grade the treatment effects of 13 cases of hemangioma and 7 cases of ota nevus. These subjective clinical grades correlated well with the treatment results obtained using the proposed color analysis system (Correlation coefficient = 0.84).
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1. College of Medicine (의과대학) > Dept. of Medical Engineering (의학공학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Plastic and Reconstructive Surgery (성형외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Deok Won(김덕원)
Rah, Dong Kyun(나동균)
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