• 作者：M. Conde Quintero^a ; ^{mconde@fraternidad.com} ; J.C.G. de Sande^b ; M.J. Toscano Arroyo^c
• 关键词：Terapia por l&aacute ; ser de baja potencia ; Bioestimulació ; n ; Dosis de radiació ; n
• 刊名：Fisioterapia
• 出版年：2011
• 期刊代码：pca160_02115638
• 类别：med
• 出版时间：January-February 2011
• 卷：33
• 期：1
• 页码：5-12
• 文件大小：354 K

lass="h4">Objectives

To analyze the distribution of energy deposited in a tissue when this is irradiated with a low power laser and to study the minimum characteristics that manufacturers of low power laser therapy equipments should include to estimate the dosage.

lass="h4">Material and methods

Monte Carlo simulation was performed to determine the absorption location of the laser energy. The diffusion theory was used to estimate penetration depth and mean free path. Variation of this distribution was studied based on three different skin types (Caucasians, Asians and Afroamericans) and for two different anatomic locations: palm and volar forearm. Information given by several manufactures of low power laser therapy equipments has been analyzed.

lass="h4">Results

Infrared (810 nm) laser radiation is mainly absorbed in a skin layer of thickness 1.9 卤 0.2 mm for Caucasians, from 1.73 卤 0.08 mm (volar forearm) to 1.80 卤 0.11 mm (palm) for Asians, and from 1.25 卤 0.09 mm (volar forearm) to 1.65 卤 0.2 mm (palm) for Afroamericans. The light mean free path is lower than 0.69 卤 0.09 mm for all cases. The laser beam characteristics (beam shape, energy distribution on a transversal section, divergence, incidence angle, etc.) are not usually specified by the manufacturers. Only beam size (ranging from 0.08 to 1 cm²) is given in some cases.

lass="h4">Discussion and conclusions

Depending on the low power laser therapy equipment, on the patient and on the anatomic area to be treated, the staff should adapt the recommended dosage for each individual case.