Takiwaki H, Serup J
Department of Dermatology, School of Medicine, University of Tokushima, Japan.
Skin Pharmacol. 1994;7(3):145-50. doi: 10.1159/000211289.
Color parameters were measured on 50 psoriatic plaques in 10 patients, after scoring the amount of scales on them by inspection, with a narrow-band reflectance spectrophotometer (erythema/melanin index expression) and tristimulus colorimeter (CIE Lab* expression). Both erythema index a* (redness) were highest in the group of erythematous plaque with little scale (twice as high as in controls) and decreased significantly as the plaques were covered with thicker scale, while L* (brightness) changed in just the opposite fashion of a*. These portable 'color indicators' can be utilized to express the appearance of psoriatic plaques quantitatively, especially the extent of erythema and the amount of the scale on it.
对10名患者的50个银屑病斑块进行了颜色参数测量，通过检查对斑块上的鳞屑量进行评分后，使用窄带反射分光光度计（红斑/黑色素指数表达）和三色刺激比色计（CIE Lab表达）。红斑指数a（发红）在鳞屑少的红斑斑块组中最高（是对照组的两倍），并且随着斑块上覆盖的鳞屑变厚而显著降低，而L*（亮度）的变化与a*相反。这些便携式“颜色指标”可用于定量表达银屑病斑块的外观，特别是红斑的程度及其上的鳞屑量。
