Abstract

Doppler optical coherence tomography (DOCT) is a valuable tool for depth-resolved flow measurements in tissue. However, DOCT is insensitive to flow in the direction normal to the imaging beam and requires knowledge of the phase of the demodulated signal. We present an alternative method of extracting flow information, using speckle of conventional amplitude optical coherence tomography images. Due to the pixel-by-pixel acquisition scheme of conventional OCT, time-varying speckle is manifested as a change in OCT image spatial speckle frequencies. We tested the ability of speckle to provide quantitative flow information using an Intralipid flow phantom. Over a range of velocities, the ratio of high to low OCT image spatial frequencies was shown to bear a linear relation to flow velocity. With two dimensional imaging, flow in a tube and in vivo hamster skin was visualized. This study shows the feasibility of extracting flow from OCT images in all directions without phase information.

© 2005 Optical Society of America

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References

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Appl. Opt. (1)

Arch. Ophthalmol. (1)

S. Yazdanfar, A. M. Rollins, and J. A. Izatt, �??In vivo imaging of human retinal flow dynamics by color Doppler optical coherence tomography,�?? Arch. Ophthalmol., 121, 235-239 (2003).
[PubMed]

J. Biomed. Opt. (2)

J. M. Schmitt, S. H. Xiang, K. M. Yung, �??Speckle in Optical Coherence Tomography,�?? J. Biomed. Opt. 4, 95-105 (1999).
[CrossRef]

K. Gossage, T. Tkaczyk, J. Rodriguez and J. Barton, �??Texture Analysis of Optical Coherence Tomography Images: Feasibility for Tissue Classification,�?? J. Biomed. Opt. 8, 570-575 (2003).
[CrossRef] [PubMed]

J. Opt. Soc. Am. A (1)

Laser speckle and related phenomena (1)

J.W. Goodman, �??Statistical Properties of Laser Speckle Patterns,�?? in Laser speckle and related phenomena, Vol.9 in series Topics in Applied Physics, J.C. Dainty, Ed., (Springer-Verlag, New York, 1984).

Opt. Commun. (1)

A. F. Fercher and J. D. Briers, �??Flow Visualization by Means of Single-Exposure Speckle Photography,�?? Opt. Commun. 37, 326-330 (1981).
[CrossRef]

Opt. Eng. (1)

J. D. Briers, �??Speckle Fluctuations and Biomedical Optics: Implications and Applications,�?? Opt. Eng. 32 277-283 (1993).
[CrossRef]

Opt. Laser Tech. (1)

Y. Aizu and T. Asakura, �??Bio-Speckle Phonomena and Their Application to the Evaluation of Blood Flow,�?? Opt. Laser Tech. 23, 205-219 (1991).
[CrossRef]

Opt. Lett. (7)

Phys. Med. Biol. (1)

J. K. Barton, A. S. Yazdanfar, T. J. Pfefer, V. Westphal and J. A. Izatt, �??Photothermal coagulation of blood vessels: a comparison of high-speed optical coherence tomography and numerical modeling,�?? Phys. Med. Biol. 46, 1665-1678 (2001).
[CrossRef] [PubMed]

Proc. SPIE (2)

A. N. Yaroslavsky, I. V. Yaroslavsky, T. Goldbach and H. J. Schwarzmaier, �??Optical properties of blood in the near-infrared spectral range,�?? Proc. SPIE 2678, 314�??24 (1996).
[CrossRef]

T. S. Tkaczyk, K. W. Gossage and J. K. Barton, �??Speckle Image Properties in Optical Coherence Tomography,�?? Proc. SPIE 4619, 59-77 (2002).
[CrossRef]

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Figures (3)

Fig. 1.
Fig. 1.

Graph of calculated Doppler velocity and high-low ratio (HLR) calculated from phantom experiments.

Fig. 2.
Fig. 2.

Magnitude image (left), Doppler velocity (top right) and speckle flow (bottom right) images of flowing Intralipid in a glass capillary tube. In velocity/flow images, from left to right, average flow velocities are 0, 10, 15, and 17.5 mm/s. Doppler image scale in mm/s, speckle flow image scale in arbitrary units.

Fig. 3.
Fig. 3.

Magnitude (left), speckle flow (middle) and corresponding histology (right) images of hamster skin. Regions of high HLR in the speckle flow image correspond to blood vessels seen visually in the preparation, and in histology.

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