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Spectrophotometric Measurement of Minimal Erythema Dose Sites after Narrowband Ultraviolet B Phototesting: Clinical Implication of Spetrophotometric Values in Phototherapy
摘要： Background: The spectrophotometer is well known to be a useful tool for estimating the objective minimal erythema dose (MED) during planning of phototherapy protocol. However, only a few spectrophotometric values are used to evaluate the erythema and pigmentation of the MED site during phototesting. Objective: To determine a new meaning of the relationships among spectrophotometric values during phototesting. Methods: Twenty-five patients with psoriasis and 23 patients with vitiligo were selected before undergoing narrowband ultraviolet B phototherapy. We interpreted the gross findings of erythema and measured the L*a*b* values using a spectrophotometer at each phototest spot. We compared MEDs, basic spectrophotometric values (L*a*b*), and b*/L* values separately according to skin type, and determined the correlation of each spectrophotometric value and the correlation between a* and b*/L* values. Results: Among L*a*b* values, only b* values showed a statistically significant difference between the type III and IV groups (p=0.003). There was a positive correlation only between MEDs and b* values (p＜0.05). The average b*/L* value in the type IV group was significantly higher than the type III group (p＜0.05). Conclusion: The higher b* values in type IV skin indicates that skin tanning develops more prominently than type III. The correlation between MEDs and b* values may signify that the skin pigmentation status is deepened with the higher MEDs. The difference in b*/L* values between type III and IV skin reflects that the b*/L* value is thought to be an index of tanning. The a* value, known as an index of erythema, does not influence the degree of tanning.
关键词： a*value,Skin phototype,Spectrophotometer,L*value
更新于2025-09-04 15:30:14
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Spectrophotometers for labs: A cost-efficient solution based on smartphones
摘要： In this paper, we introduce a proposal to provide students in labs with an alternative to the traditional visible range spectrophotometers (VIS spectrophotometers), whose acquisition and maintenance entails high costs, based on smartphones. Our solution faced two aspects. On the one hand, the software for the smartphone, able to perform the typical functionalities of the traditional spectrophotometers. On the other hand, the portable peripheral support needed to capture the images to be analyzed in the smartphone. The promising results allow this solution to be applied in Bring Your Own Devices (BYOD) contexts.
关键词： BYOD,VIS spectrophotometer,Apache Cordova,scientific equipment for labs,Beer–Lambert law
更新于2025-09-04 15:30:14