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Journal of Diabetes Research
Volume 2015, Article ID 305084, 5 pages
http://dx.doi.org/10.1155/2015/305084
Research Article

Wide-Field Megahertz OCT Imaging of Patients with Diabetic Retinopathy

1Department of Ophthalmology, Technical University of Munich, Ismaninger Strasse 22, 81675 Munich, Germany
2Institute for Biomolecular Optics, Ludwig Maximilians University, Oettingenstrasse 67, 80538 Munich, Germany
3Institute of Biomedical Optics, University of Lübeck, Peter-Monnik-Weg 4, 23562 Lübeck, Germany
4Department of Ophthalmology, Ludwig Maximilians University, Mathildenstrasse 8, 80336 Munich, Germany

Received 31 March 2015; Accepted 30 June 2015

Academic Editor: Subrata Chakrabarti

Copyright © 2015 Lukas Reznicek et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To evaluate the feasibility of wide-field Megahertz (MHz) OCT imaging in patients with diabetic retinopathy. Methods. A consecutive series of 15 eyes of 15 patients with diagnosed diabetic retinopathy were included. All patients underwent Megahertz OCT imaging, a close clinical examination, slit lamp biomicroscopy, and funduscopic evaluation. To acquire densely sampled, wide-field volumetric datasets, an ophthalmic 1050 nm OCT prototype system based on a Fourier-domain mode-locked (FDML) laser source with 1.68 MHz A-scan rate was employed. Results. We were able to obtain OCT volume scans from all included 15 patients. Acquisition time was 1.8 seconds. Obtained volume datasets consisted of 2088 1044 A-scans of 60° of view. Thus, reconstructed en face images had a resolution of 34.8 pixels per degree in x-axis and 17.4 pixels per degree. Due to the densely sampled OCT volume dataset, postprocessed customized cross-sectional B-frames through pathologic changes such as an individual microaneurysm or a retinal neovascularization could be imaged. Conclusions. Wide-field Megahertz OCT is feasible to successfully image patients with diabetic retinopathy at high scanning rates and a wide angle of view, providing information in all three axes. The Megahertz OCT is a useful tool to screen diabetic patients for diabetic retinopathy.