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In the absence of a phototherapy technician, vitiligo patients need to pay attention to determine the irradiation time when using the home narrow-band UV phototherapy apparatus, including three parts: the frequency and total number of illumination, the initial irradiation time and the incremental irradiation time.

First, the frequency of illumination and the total number of times

Usually UVB phototherapy frequency is 2-3 times a week, or once every other day. Do not advocate once a day. Due to the lack of long-term follow-up data, there is no limit to the total number of UVB phototherapys observed only by clinicians. There are reports in foreign countries, UVB phototherapy for 33---93 months, no patients with suspected skin lesions or non-melanoma skin cancer (NMSC). There was no statistically significant increase in the risk of skin cancer compared with the average person. This shows that for patients with vitiligo. UVB phototherapy can be said to be a long-term, safe and effective treatment.

Second, the initial irradiation time

The initial illumination time refers to the length of the first illumination time. This is directly related to the dose of radiation. The medical profession determines the initial dose according to the type of disease, the type of skin of the user, etc.---the type of skin in China is mostly III-IV, and the initial dose of UVB phototherapy in vitiligo patients is 0.2J/cm2 (Joule/ The initial dose of PUVA therapy is 1.0 J/cm2 per square centimeter.

After determining the initial irradiation dose, the irradiation intensity value indicated on the base of the ultraviolet phototherapy apparatus and the ��irradiation time calculation method�� in the appendix of the phototherapy instrument manual may be used, or the ��irradiation dose, intensity, time reference�� may be checked. Table" to determine the corresponding initial exposure time. Take "calculation method" as an example: If the base of the phototherapy instrument you purchased is marked with an irradiation intensity of 11.00mw/cm2 (milliwatts/cm2), the initial irradiation dose of vitiligo is usually 0.2J/cm2, which is converted to 200mJ. /cm2 (milli-joule//cm 2 ), nested in the calculation formula: irradiation time = irradiation dose / irradiation intensity, that is, initial irradiation time = 200 mJ / cm 2 / 11.00 mw / cm 2 = 18.2 s (seconds). If it is not calculated, the initial irradiation time can be set to 20 seconds.

Third, incremental exposure time

After the initial irradiation time is determined and the first phototherapy is performed, the subsequent irradiation time is not constant. Pay attention to the second, third, and Nth exposure times. In other words, whether or not each irradiation time of continuous phototherapy needs to be increased, and the proportion of time increase should be determined according to the skin reaction of the phototherapy site.

The principle is:

1. If there is a slight erythema after the previous phototherapy and it has subsided during the phototherapy, it should be increased by 10% based on the previous irradiation time;

2. If there is obvious erythema after the previous phototherapy and it has not subsided during the phototherapy, the previous irradiation time should be maintained;

3. If the erythema is still severe and accompanied by pain or even blisters during the phototherapy, the phototherapy should be suspended. 4. If there is no phototherapy reaction after the previous irradiation, it can be increased by 20% based on the previous irradiation time. For example, if your previous exposure time is 18 seconds and there is no treatment response after irradiation, your next exposure time should be increased to 22 seconds.