Monitoring of thermal expansion during photocoagulation by optical coherence tomography.
JiaPu Syu1*, WenChuan Kuo1, ShihJen Chen2, ChiaHan Tsou3, KuanWei Su3, YungFu Chen3
1Institute of Biophotonics, National Yang-Ming University, Taipei, Taiwan
2Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
3Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
* Presenter:JiaPu Syu,
Retinal laser photocoagulation may be accompanied by side effects that damage the surrounding healthy tissues. To evaluate the tissue thermal-changes by laser irradiation, a spectral-domain optical coherence tomography (OCT) is used to monitor retina tissue during the therapy. High-speed Spectral-domain OCT combines with commercial photocoagulation laser provide 130k A-lines per second and 2.6 μm in axial resolution. Three different OCT contrast are used to analyze thermal expansion displacement of the ex vivo porcine eye. The results demonstrated the feasibility of using OCT to evaluate the tissue thermal-changes in retinal laser photocoagulation. Therefore, OCT can be used to control laser power for more precise and less damage to retinal photocoagulation treatment.

Keywords: Optical Coherence Tomography, photocoagulation, thermal expansion