Spectral imaging using illumination of preselected spectral content
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United States of America Patent
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Nov 7, 2000
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N/A
app pub date -
Aug 30, 1998
filing date -
Aug 30, 1998
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Expired
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Abstract
A device and method for spectral imaging of an object. A plurality of sets of narrow-band light sources such as LEDs are provided. Each set emits illumination radiation in a different narrow spectral band. Each set is activated sequentially to illuminate the object. Light reflected from the object or transmitted by the object is focused on a detector array to image the object. Narrower illumination bands are provided by dispersing the emitted light using a dispersive optical element such as a diffraction grating. Alternatively; selected sets or subsets are activated simultaneously with duty cycles that emulate a preselected spectral distribution. For imaging ocular fundus tissue, the illumination light is shaped into an annular beam by an appropriately shaped waveguide.
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