The Effect of Polarized Laser Radiation on Viscoelastic Properties of Soft Tissue

Background: laser-tissue interaction on low-level laser therapy (lllt) haswidespread medical applications (e.g., improved wound healing). the tensile strengthof radiated tissue by lllt is known to be increased mainly because of cross collagenbands developed after radiation.objective: in this work, we studied the instantaneous effect of radiation of polarizedlaser beam on the viscoelastic tissue properties.methods: the viscoelastic behavior of tissue was investigated by experimentalmeasurement and analyses of stress-strain plots.result: lllt increased the viscoelastic properties of the irradiated soft tissue.the maximum variation in viscoelasticity was attained when the direction of laserpolarization is parallel to the tissue stretch vector. the variation also depended onduration of laser irradiation.conclusion: viscoelastic properties of soft tissue can be changed by polarizedlaser radiation.