Retinal Imaging

We have designed a fast-switching LED-based discrete-wavelength light source that can be used in combination with a high sensitivity CCD camera to obtain movement-free multispectral image sequences of the fundus. The system is capable of acquiring images at least one order of magnitude more quickly than the existing tunable filter system used by our group.

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This photograph shows the ocular microscope with the CCD camera mounted on top - the light source is on the bench

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This is a block diagram of the whole system


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And here are the first test images we took. From left to right the wavelengths are 535 nm, 592 nm, 630 nm and 640 nm.  The exposure time in the top row is 100 ms per image, and 25 ms in the bottom row.