Role of Laser in interstitial photocoagulation of deep vascular lesions

Abstract

To reach your goals you must start from a correct point and proceed in -a correct manner. Laser is the acronym for, Light Amplication by Stimulated Emission of Radiation Laser like sun light or light from• a lamp, •can be• refracted; absorbed, reflected, and diffused. lt differ from ordinary light in having an intense ,coherent directional beam and energy delivered in milliseconds to nanoseconds .This light is monochromatic . ' . . ,that is all light vvaves are the same in length and travel in phase and in the Sati1e direction .over long distance these parallel beams have minimal divergence or convergence (collimation). Moreover the laser light is non ionizing radiatioi1 (its wave lengths are longer than 200 nm).In the electromagnetic spectrum .laser light • lies in the infrared and visible light portions (Ap.felberg.1987). Deep vascular lesions arc considered as haemangiomas, vascular malformations mainly, and varicose veins. Haemangiomas and vascular malformations are the vascular benign lesions most common in infancy (Bowers et a/,1960).Vascular lesions are first divided into two main categories (haemangiomas , and vascular malformations )this division is based largely on the presence or absence of endothelial proliferation. Haemangiomas show endothelial proliferation and tendency to involutes spontaneously , and can be sub class!fied according to the stage of their evolution.