Microscope-mounted intraoperative optical coherence tomography with actively tunable focus and optical path length (Conference Presentation)

Ju Ha Kim; Yong Joon Joo; Su Min Han; Eun-Seo Choi; Tae Joong Eom

doi:10.1117/12.2289478

5 April 2018 Microscope-mounted intraoperative optical coherence tomography with actively tunable focus and optical path length (Conference Presentation)

Ju Ha Kim, Yong Joon Joo, Su Min Han, Eun-Seo Choi, Tae Joong Eom

Author Affiliations +

Proceedings Volume 10484, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVI; 104840U (2018) https://doi.org/10.1117/12.2289478
Event: SPIE BiOS, 2018, San Francisco, California, United States

Abstract

We present a method for an intraoperative microscope-mounted Fourier-domain optical coherence tomography (FD-OCT) system to maintain high image contrast while dynamic adjusting focal planes. Because two imaging system with different imaging depth are integrated into one system, active control of OCT imaging conditions is indispensible for functioning high quality imaging modality. For the purpose of active adjustment of the focal plane, an electrically focus tunable lens (FTL) was used in the sample arm of the OCT system. Because the OCT image contrast at a depth is given by roll-off characteristics of the FD-OCT that is a function of difference in OPL between the sample and reference arm, we should compensate the difference in the OPL to enhance image contrast. We proposed the use of a piezoelectric actuator (PZT) attached to a reflection optic to actively control the OPL in the reference arm. With active controlling the FTL and PZT simultaneously, we can optimize and keep the OCT image contrast while maintaining image depth positions. From a surface position in the OCT image, the focal length variations with the FTL are calculated and the focal length of the FTL is tuned to match on the sample surface. Contrast optimization with the PZT is performed with compensating the optical path length difference from the additional focal length of the FTL. We integrated the OCT to a conventional surgical microscope and demonstrate feasible observation of OCT image with high contrast at constant imaging depth under the change of focal plane of the microscope.

Conference Presentation

Citation Download Citation

Ju Ha Kim, Yong Joon Joo, Su Min Han, Eun-Seo Choi, and Tae Joong Eom "Microscope-mounted intraoperative optical coherence tomography with actively tunable focus and optical path length (Conference Presentation)", Proc. SPIE 10484, Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVI, 104840U (5 April 2018); https://doi.org/10.1117/12.2289478

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KEYWORDS

Optical coherence tomography

Imaging systems

Ferroelectric materials

Microscopes

Active optics

Actuators

Control systems

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