Improved safety of retinal photocoagulation with a shaped beam and modulated pulse

Christopher Sramek; Jefferson Brown; Yannis M. Paulus; Hiroyuki Nomoto; Daniel Palanker

doi:10.1117/12.841079

2 March 2010 Improved safety of retinal photocoagulation with a shaped beam and modulated pulse

Christopher Sramek, Jefferson Brown, Yannis M. Paulus, Hiroyuki Nomoto, Daniel Palanker

Proceedings Volume 7550, Ophthalmic Technologies XX; 75500V (2010) https://doi.org/10.1117/12.841079
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

Shorter pulse durations help confine thermal damage during retinal photocoagulation, decrease treatment time and minimize pain. However, safe therapeutic window (the ratio of threshold powers for rupture and mild coagulation) decreases with shorter exposures. A ring-shaped beam enables safer photocoagulation than conventional beams by reducing the maximum temperature in the center of the spot. Similarly, a temporal pulse modulation decreasing its power over time improves safety by maintaining constant temperature for a significant portion of the pulse. Optimization of the beam and pulse shapes was performed using a computational model. In vivo experiments were performed to verify the predicted improvement. With each of these approaches, the pulse duration can be decreased by a factor of two, from 20 ms down to 10 ms while maintaining the same therapeutic window.

Citation Download Citation

Christopher Sramek, Jefferson Brown, Yannis M. Paulus, Hiroyuki Nomoto, and Daniel Palanker "Improved safety of retinal photocoagulation with a shaped beam and modulated pulse", Proc. SPIE 7550, Ophthalmic Technologies XX, 75500V (2 March 2010); https://doi.org/10.1117/12.841079

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