Signal processing for robotically assisted laser photocoagulation of the retina

Cameron H. G. Wright; Peter W. de Graaf; Steven F. Barrett; R. Daniel Ferguson

doi:10.1117/12.364020

4 October 1999 Signal processing for robotically assisted laser photocoagulation of the retina

Cameron H. G. Wright, Peter W. de Graaf, Steven F. Barrett, R. Daniel Ferguson

Proceedings Volume 3809, Signal and Data Processing of Small Targets 1999; (1999) https://doi.org/10.1117/12.364020
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A new system for robotically assisted retinal surgery requires real-time signal processing of the reflectance signal from small targets on the retina. Laser photocoagulation is used extensively by ophthalmologists to treat retinal disorders such as diabetic retinopathy and retinal breaks. Currently, the procedure is performed manually and suffers from several drawbacks which a computer-assisted system could alleviate. Such a system is under development that will rapidly and safely place multiple therapeutic lesions at desired locations on the retina in a mater of seconds. This system provides real- time, motion-stabilized lesion placement for typical clinical irradiation times. A reflectance signal from a small target on the retina is used to derive high-speed tracking corrections to compensate for patient eye movement by adjusting the laser pointing angles. Another reflectance signal from a different small target on the retina is used to derive information to control the laser irradiation time which allows consistent lesion formation over any part of the retina. This paper describes the electro-optical system which dynamically measures the two reflectance signals, determines the appropriate reflectance parameters in real time, and controls laser pointing and irradiation time to meet the stated requirements.

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Cameron H. G. Wright, Peter W. de Graaf, Steven F. Barrett, and R. Daniel Ferguson "Signal processing for robotically assisted laser photocoagulation of the retina", Proc. SPIE 3809, Signal and Data Processing of Small Targets 1999, (4 October 1999); https://doi.org/10.1117/12.364020

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KEYWORDS

Reflectivity

Retina

Analog electronics

Mirrors

Laser coagulation

Optical tracking

Reflectometry

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