7 February 2007 Endoscopic optical coherence tomography of the retina at 1310 nm using paired-angle rotating scanning
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Proceedings Volume 6429, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XI; 642911 (2007); doi: 10.1117/12.701226
Event: SPIE BiOS, 2007, San Jose, California, United States
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.
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Marinko V. Sarunic, Shuo Han, Jigang Wu, Zahid Yaqoob, Mark Humayun, Changhuei Yang, "Endoscopic optical coherence tomography of the retina at 1310 nm using paired-angle rotating scanning", Proc. SPIE 6429, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XI, 642911 (7 February 2007); doi: 10.1117/12.701226; http://dx.doi.org/10.1117/12.701226
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KEYWORDS
Optical coherence tomography

GRIN lenses

Endoscopy

Vitreous

Retina

Imaging systems

Surgery

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