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High speed optical holography of retinal blood flow

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Abstract

We performed noninvasive video imaging of retinal blood flow in a pigmented rat by holographic interferometry of near-infrared laser light backscattered by retinal tissue, beating against an off-axis reference beam sampled at a frame rate of 39 kHz with a high throughput camera. Local Doppler contrasts emerged from the envelopes of short-time Fourier transforms and the phase of autocorrelation functions of holograms rendered by Fresnel transformation. This approach permitted imaging of blood flow in large retinal vessels (30 microns diameter) over 400×400pixels with a spatial resolution of 8 microns and a temporal resolution of 6.5ms.

© 2016 Optical Society of America

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Supplementary Material (6)

NameDescription
Visualization 1: MOV (7503 KB)      Zeroth moment of the spectrum M0.
Visualization 2: MOV (9664 KB)      First moment of the spectrum M1.
Visualization 3: MOV (13503 KB)      Second moment of the spectrum M2.
Visualization 4: MOV (22816 KB)      Composite image M0 M2.
Visualization 5: MOV (28682 KB)      Composite image M0 M1.
Visualization 6: MOV (4420 KB)      Phase images.

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Figures (5)

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Equations (4)

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