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2 March 2010 Improved safety of retinal photocoagulation with a shaped beam and modulated pulse
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Proceedings Volume 7550, Ophthalmic Technologies XX; 75500V (2010)
Event: SPIE BiOS, 2010, San Francisco, California, United States
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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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