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Proceedings Paper

Instrumentation for feedback-controlled retinal photocoagualation
Author(s): Steven F. Barrett; Maya Ratna Jerath; Henry Grady Rylander; Ashley J. Welch
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Paper Abstract

Laser induced retinal lesions are used to treat a variety of eye diseases. The size and location of these retinal lesions are critical for effective treatment and minimal complications. An automated system is under development for retinal photocoagulation to improve the accuracy of this treatment. Separate instrumentation systems have been developed to monitor and control lesion growth in real time to compensate for tissue inhomogeneity, and to track and compensate for retinal movement during irradiation. A real time lesion feedback control system is implemented on a UNIX based workstation. A CCD camera (30 frames/second) and coagulating laser are coaxially aligned such that images of the lesion can be acquired during laser irradiation. Parameters of these reflectance images are extracted by an image processor in real time and when certain preset thresholds are exceeded, the laser is shut off. The camera and laser legs are alternately shuttered during irradiation by a high speed spinning wheel to prevent the reflected light from the laser from interfering with the reflectance signal. This system is coupled to a fundus camera for delivery to the eye.

Paper Details

Date Published: 7 July 1993
PDF: 10 pages
Proc. SPIE 1892, Medical Lasers and Systems II, (7 July 1993); doi: 10.1117/12.147487
Show Author Affiliations
Steven F. Barrett, Univ. of Texas/Austin (United States)
Maya Ratna Jerath, Wellman Labs. of Photomedicine (United States)
Henry Grady Rylander, Univ. of Texas/Austin (United States)
Ashley J. Welch, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 1892:
Medical Lasers and Systems II
David M. Harris; Carl Murray Penney; Abraham Katzir, Editor(s)

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