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Automatic control of lesion size in a simulated model of the eye

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4 Author(s)
Y. Yang ; Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA ; M. S. Markow ; A. J. Welch ; H. G. Rylander

A multiple-layer phantom consisting of a thin absorbing layer sandwiched between two nonabsorbing layers was created to simulate laser-induced thermal lesions in the eye. The nonabsorbing layers consisted of clear egg white, and the thin (20-40-μm) absorbing layer was created with black spray paint. Heat generated in the absorbing layer during 0.5-10-s argon irradiation was conducted to the adjacent egg white. Sufficient heat produced a region of coagulation that was graphically evidenced by the characteristic whiteness of cooked egg white. Light reflected from the lesion was monitored with a video camera and used as a feedback signal to control irradiation time. The laser irradiation was automatically ended when the diameter of the reflectance parameter related to coagulation thickness reached a preselected value

Published in:

IEEE Journal of Quantum Electronics  (Volume:26 ,  Issue: 12 )