Opt Lett. 2009 Jul 1;34(13):1943-5.

High-resolution OCT balloon imaging catheter with astigmatism correction.

Xi J, Huo L, Wu Y, Cobb MJ, Hwang JH, Li X.

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Department of Bioengineering, University of Washington, Seattle, WA 98195, USA.

Abstract

We report new optics designs for an optical coherence tomography (OCT) balloon imaging catheter to achieve diffraction-limited high resolution at a large working distance and enable the correction of severe astigmatism in the catheter. The designs employed a 1 mm diameter gradient-index lens of a properly chosen pitch number and a glass rod spacer to fully utilize the available NA of the miniature optics. Astigmatism caused by the balloon tubing was analyzed, and a method based on a cylindrical reflector was proposed and demonstrated to compensate the astigmatism. A catheter based on the new designs was successfully developed with a measured diffraction-limited lateral resolution of approximately 21 microm, a working distance of approximately 11-12 mm, and a round-shape beam profile. The performance of the OCT balloon catheter was demonstrated by 3D full-circumferential imaging of a swine esophagus in vivo along with a high-speed, Fourier-domain, mode-locked swept-source OCT system.

PMID:: 19571960; [PubMed - indexed for MEDLINE]

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