Photocoagulation is a common retinal laser treatment. Intra- and inter-individual variations of light scattering and absorption conditions make it impossible to achieve lesions of equal strength without a real-time temperature control. An optical temperature control concept may be based on laser speckle analysis, which is investigated in this work. A HeNe laser (633nm) was used for illumination of the porcine RPE and RPE models heated by a standard coagulation laser (532nm) using different irradiances. The scattered light was imaged on a CCD camera and then analyzed regarding speckle movement. It could be demonstrated that the speckle movement is radial towards the center of heating and accordingly reverse during relaxation. Furthermore a correlation between the magnitude of movement and the irradiance could be shown.
|Title of host publication
|Student Conference Medical Engineering Science 2013
|T. M. Buzug
|Place of Publication
|Published - 2013
|Student Conference 2013 - Lübeck, Germany
Duration: 13.03.2013 → 14.03.2013