Reflectance feedback control of photocoagulation in vivo

Maya Ratna Jerath; Ravi K. Chundru; Steven F. Barrett; Henry Grady Rylander III; Ashley J. Welch

doi:10.1117/12.147537

24 June 1993 Reflectance feedback control of photocoagulation in vivo

Maya Ratna Jerath, Ravi K. Chundru, Steven F. Barrett, Henry Grady Rylander III, Ashley J. Welch

Proceedings Volume 1877, Ophthalmic Technologies III; (1993) https://doi.org/10.1117/12.147537
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Laser induced retinal lesions are used to treat a variety of eye diseases such as diabetic retinopathy and retinal detachment. In this treatment, an argon laser beam is directed into the eye through the pupil onto the fundus where the heat resulting from the absorbed laser light coagulates the retinal tissue. This thermally damaged region is highly scattering and appears as a white disk. The size of the retinal lesions is critical for effective treatment and minimal complications. A real time feedback control system is implemented that monitors lesion growth using two-dimensional reflectance images acquired by a CCD camera. The camera views the lesion formation on axis with the coagulating laser beam. The reflectance images are acquired and processed as the lesion forms. When parameters of the reflectance images that are correlated to lesion dimensions meet certain preset thresholds, the laser is shuttered. Results of feedback controlled lesions formed in vivo in pigmented rabbits are presented. An ability to produce uniform lesions despite variation in the tissue absorption or changes in laser power is demonstrated. This lesion control system forms part of a larger automated system for retinal photocoagulation.

Citation Download Citation

Maya Ratna Jerath, Ravi K. Chundru, Steven F. Barrett, Henry Grady Rylander III, and Ashley J. Welch "Reflectance feedback control of photocoagulation in vivo", Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); https://doi.org/10.1117/12.147537

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