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Proceedings Paper

Endoscopic optical coherence tomography of the retina at 1310 nm using paired-angle rotating scanning
Author(s): Marinko V. Sarunic; Shuo Han; Jigang Wu; Zahid Yaqoob; Mark Humayun; Changhuei Yang
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Paper Abstract

Vitrectomy (removal of the vitreous humor) is an ophthalmic surgery required as a precursor to several posterior chamber procedures. Vitrectomy is commonly performed using an endoscopic vitreous cutter and fiber based light delivery for observation through a surgical microscope. Cross-sectional visualization of the retina and remnant vitreous layers during surgery using an external optical coherence tomography (OCT) scanner is impractical due to deformation in the shape of the eye and the cornea. We present a forward imaging probe with 820 &mgr;m outer diameter (21 gauge needle) for cross-sectional endoscopic OCT imaging during ophthalmic surgeries. The Paired-Angle-Rotating Scanner (PARS) OCT probe is based on angle polished gradient index (GRIN) lenses which are rotated about the optical axis. The scan pattern is determined by the angle between the GRIN lenses and the relative angular velocity. Endoscopic placement of the PARS-OCT probe tip near the retinal surface permits use of a longer wavelength light, in particular 1310 nm, which would otherwise suffer significant attenuation traversing the vitreous humor. The prototype endoscopic PARS-OCT probe is coupled to a commercially available 1310 nm swept laser source, and uses commercial software for data acquisition, processing, and display of retinal images in real time at an A-scan rate of 16 kHz. We present an analysis of aberrations due to off axis use of GRIN lenses and measure the scan pattern of the PARS probe. Images acquired on an ex vivo porcine retina are presented, motivating development of the endoscopic PARS-OCT probe for clinical evaluation.

Paper Details

Date Published: 7 February 2007
PDF: 11 pages
Proc. SPIE 6429, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XI, 642911 (7 February 2007); doi: 10.1117/12.701226
Show Author Affiliations
Marinko V. Sarunic, Simon Fraser Univ. (Canada)
Shuo Han, California Institute of Technology (United States)
Jigang Wu, California Institute of Technology (United States)
Zahid Yaqoob, California Institute of Technology (United States)
Mark Humayun, Univ. of Southern California (United States)
Changhuei Yang, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6429:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XI
James G. Fujimoto; Joseph A. Izatt; Valery V. Tuchin, Editor(s)

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