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Proceedings Paper

Guidance of hard tissue ablation by forward-viewing optical coherence tomography
Author(s): Paul J. L. Webster; Benjamin Y. C. Leung; Victor X. D. Yang; James M. Fraser
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Paper Abstract

A key issue in laser surgery is the inability for the human operator to stop the laser irradiation in time while cutting/ablating delicate tissue layers. In the present work, we forward-image through the laser machining front in complex biological tissue (dense bovine bone) to monitor the incision's approach to subsurface interfaces in real-time (47-312 kHz line rate). Feedback from imaging is used to stop the drilling process within 150 micron of a targeted interface. This is accomplished by combining the high temporal and spatial resolution of infrared optical coherence tomography (OCT) with a robust, turn-key, high brightness fiber laser. The high sensitivity of the imaging system (~100 dB) permit imaging through the rapidly changing beam path even with the additional scattering caused by the thermal cutting process. In spectral-domain OCT, the imaging acquisition period is easily locked to the machining laser exposure. Though motion-induced artifacts reduce interface contrast, they do not introduce incorrect depth measurements as found in other OCT variants. Standard tomography imaging of the tissue (B-scans) is also recorded in situ before and after laser processing to highlight morphology changes.

Paper Details

Date Published: 19 February 2010
PDF: 6 pages
Proc. SPIE 7554, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIV, 75540Z (19 February 2010); doi: 10.1117/12.842987
Show Author Affiliations
Paul J. L. Webster, Queen's Univ. (Canada)
Benjamin Y. C. Leung, Queen's Univ. (Canada)
Victor X. D. Yang, Univ. of Toronto (Canada)
Ryerson Univ. (Canada)
Sunnybrook Health Science Ctr. (Canada)
James M. Fraser, Queen's Univ. (Canada)

Published in SPIE Proceedings Vol. 7554:
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIV
Joseph A. Izatt; James G. Fujimoto; Valery V. Tuchin, Editor(s)

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