Research Papers

Dynamic focus in optical coherence tomography for retinal imaging

[+] Author Affiliations
M. Pircher, E. Götzinger, C. K. Hitzenberger

Medical University of Vienna, Center for Biomedical Engineering and Physics, Vienna, Austria

J. Biomed. Opt. 11(5), 054013 (October 03, 2006). doi:10.1117/1.2358960
History: Received July 29, 2005; Revised June 26, 2006; Accepted June 26, 2006; Published October 03, 2006; Online October 03, 2006
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Imaging the human retina still represents the main field of application of optical coherence tomography (OCT). A major advantage of OCT is the decoupling of depth resolution (given by the coherence length of the light source) and transverse resolution (given by the focal spot size). This enables images of the retina with high depth resolution. On the other hand, in most OCT systems, a limited transverse resolution has been accepted to provide a sufficiently large (1mm) depth of focus. However, to obtain images with high transverse resolution throughout the whole depth of the retina (especially in the nerve head region) a tracking of coherence gate and focus position (dynamic focus) is essential. This study realizes a dynamic focus in a time domain transversal (en face) scanning system for retinal imaging. We show that maintenance of a transverse resolution of 4.4μm can be achieved over an optical depth of 1mm in a model eye and apply our method to imaging the human retina in vivo.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

M. Pircher ; E. Götzinger and C. K. Hitzenberger
"Dynamic focus in optical coherence tomography for retinal imaging", J. Biomed. Opt. 11(5), 054013 (October 03, 2006). ; http://dx.doi.org/10.1117/1.2358960


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