Irradiation control parameters for computer-assisted laser photocoagulation of the retina

Espen Naess; Torstein Molvik; Steven F. Barrett; Cameron H. G. Wright; Peter W. de Graaf

doi:10.1117/12.429283

7 June 2001 Irradiation control parameters for computer-assisted laser photocoagulation of the retina

Espen Naess, Torstein Molvik, Steven F. Barrett, Cameron H. G. Wright, Peter W. de Graaf

Proceedings Volume 4245, Ophthalmic Technologies XI; (2001) https://doi.org/10.1117/12.429283
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

A system for robotically assisted retinal surgery has been developed to rapidly and safely place lesions on the retina for photocoagulation therapy. This system provides real- time, motion stabilized lesion placement for typical irradiation times of 100 ms. The system consists of three main subsystems: a global, digital-based tracking subsystem; a fast, local analog tracking subsystem; and a confocal reflectance subsystem to control lesion parameters dynamically. We have reported on these subsystems in previous SPIE presentations. This paper concentrates on the development of the second hybrid system prototype. Considerable progress has been made toward reducing the footprint of the optical system, simplifying the user interface, fully characterizing the analog tracking system and using measurable lesion reflectance growth parameters to develop a noninvasive method to infer lesion depth. This method will allow dynamic control of laser dosimetry to provide similar lesions across the non-uniform retinal surface. These system improvements and progress toward a clinically significant system are covered in detail within this paper.

Citation Download Citation

Espen Naess, Torstein Molvik, Steven F. Barrett, Cameron H. G. Wright, and Peter W. de Graaf "Irradiation control parameters for computer-assisted laser photocoagulation of the retina", Proc. SPIE 4245, Ophthalmic Technologies XI, (7 June 2001); https://doi.org/10.1117/12.429283

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