Temperature induced tissue deformation monitored by dynamic speckle interferometry

Kathrin Bliedtner, Eric Seifert, Ralf Brinkmann


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.
Original languageEnglish
Title of host publicationStudent Conference Medical Engineering Science 2013
EditorsT. M. Buzug
Place of PublicationLübeck
PublisherGRIN Publishing
Publication date2013
ISBN (Print)978-3-656-38193-8
ISBN (Electronic)978-3-656-38192-1
Publication statusPublished - 2013
EventStudent Conference 2013 - Lübeck, Germany
Duration: 13.03.201314.03.2013


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