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Feasibility and accuracy of a newly developed hand‐held device with a flat‐type fluorescent lamp for measuring the minimal erythema dose for narrow‐band UVB therapy

Background: Narrow‐band ultraviolet B (NB‐UVB) for the treatment of refractory skin diseases, such as psoriasis and atopic dermatitis, requires an adequate irradiation protocol based on the minimal erythema dose (MED) to establish an optimal dosage schedule. Although MED can be measured using a systemic‐type irradiation unit, there are difficulties associated with this device. There is no standardized device available to determine the MED for NB‐UVB. Here, we compared a conventional device with a newly developed device for measuring MED.