Spectral imaging using illumination of preselected spectral cont

Details Spectral imaging using illumination of preselected spectral cont Spectral imaging using illumination of preselected spectral cont

1998-08-30

2000-11-07

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 314

Patent

active

061426296

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.

REFERENCES:
patent: 5433197 (1995-07-01), Stark
patent: 5760407 (1998-06-01), Margosiak et al.

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