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Proceedings Paper

New spectral imaging techniques for blood oximetry in the retina
Author(s): Ied Alabboud; Gonzalo Muyo; Alistair Gorman; David Mordant; Andrew McNaught; Clement Petres; Yvan R. Petillot; Andrew R. Harvey
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Paper Abstract

Hyperspectral imaging of the retina presents a unique opportunity for direct and quantitative mapping of retinal biochemistry - particularly of the vasculature where blood oximetry is enabled by the strong variation of absorption spectra with oxygenation. This is particularly pertinent both to research and to clinical investigation and diagnosis of retinal diseases such as diabetes, glaucoma and age-related macular degeneration. The optimal exploitation of hyperspectral imaging however, presents a set of challenging problems, including; the poorly characterised and controlled optical environment of structures within the retina to be imaged; the erratic motion of the eye ball; and the compounding effects of the optical sensitivity of the retina and the low numerical aperture of the eye. We have developed two spectral imaging techniques to address these issues. We describe first a system in which a liquid crystal tuneable filter is integrated into the illumination system of a conventional fundus camera to enable time-sequential, random access recording of narrow-band spectral images. Image processing techniques are described to eradicate the artefacts that may be introduced by time-sequential imaging. In addition we describe a unique snapshot spectral imaging technique dubbed IRIS that employs polarising interferometry and Wollaston prism beam splitters to simultaneously replicate and spectrally filter images of the retina into multiple spectral bands onto a single detector array. Results of early clinical trials acquired with these two techniques together with a physical model which enables oximetry map are reported.

Paper Details

Date Published: 18 July 2007
PDF: 10 pages
Proc. SPIE 6631, Novel Optical Instrumentation for Biomedical Applications III, 66310L (18 July 2007); doi: 10.1117/12.728535
Show Author Affiliations
Ied Alabboud, Heriot Watt Univ. (United Kingdom)
Gonzalo Muyo, Heriot Watt Univ. (United Kingdom)
Alistair Gorman, Heriot Watt Univ. (United Kingdom)
David Mordant, Cheltenham General Hospital (United Kingdom)
Andrew McNaught, Cheltenham General Hospital (United Kingdom)
Clement Petres, Heriot Watt Univ. (United Kingdom)
Yvan R. Petillot, Heriot Watt Univ. (United Kingdom)
Andrew R. Harvey, Heriot Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 6631:
Novel Optical Instrumentation for Biomedical Applications III
Christian D. Depeursinge, Editor(s)

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