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7 March 2022 Monitoring the thermal expansion with phase-resolved OCT for temperature control in retinal laser therapy
David Veysset, Yueming Zhuo, Tong Ling, Vimal P. Pandiyan, Ramkumar Sabesan, Daniel Palanker
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Proceedings Volume PC11948, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVI; PC119480J (2022) https://doi.org/10.1117/12.2612166
Event: SPIE BiOS, 2022, San Francisco, California, United States
Abstract
We present a method for determining the optical and thermal properties of layered materials, applicable to retinal laser therapy, using phase-resolved OCT. Transient heating of a tissue phantom is achieved by focusing a laser pulse onto a buried absorbing layer. Optical path length changes between the top of the phantom and the scattering absorbing layer induced by material expansion are extracted from the sequential B-scans. The absorption coefficient, heat conductivity and thermal expansion coefficient of the polymer are determined by matching the experimental data to a thermomechanical model of the tissue, yielding a temperature precision <2%, well below damage threshold.
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David Veysset, Yueming Zhuo, Tong Ling, Vimal P. Pandiyan, Ramkumar Sabesan, and Daniel Palanker "Monitoring the thermal expansion with phase-resolved OCT for temperature control in retinal laser therapy", Proc. SPIE PC11948, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXVI, PC119480J (7 March 2022); https://doi.org/10.1117/12.2612166
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KEYWORDS
Laser therapeutics
Optical coherence tomography
Beam controllers
Absorption
Data modeling
Polymers
Pulsed laser operation
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