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Journal of Biomedical Optics

Magnetomotive laser speckle imaging
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Paper Abstract

Laser speckle imaging (LSI) involves analysis of reflectance images collected during coherent optical excitation of an object to compute wide-field maps of tissue blood flow. An intrinsic limitation of LSI for resolving microvascular architecture is that its signal depends on relative motion of interrogated red blood cells. Hence, with LSI, small-diameter arterioles, venules, and capillaries are difficult to resolve due to the slow flow speeds associated with such vasculature. Furthermore, LSI characterization of subsurface blood flow is subject to blurring due to scattering, further limiting the ability of LSI to resolve or quantify blood flow in small vessels. Here, we show that magnetic activation of superparamagnetic iron oxide (SPIO) nanoparticles modulate the speckle flow index (SFI) values estimated from speckle contrast analysis of collected images. With application of an ac magnetic field to a solution of stagnant SPIO particles, an apparent increase in SFI is induced. Furthermore, with application of a focused dc magnetic field, a focal decrease in SFI values is induced. Magnetomotive LSI may enable wide-field mapping of suspicious tissue regions, enabling subsequent high-resolution optical interrogation of these regions. Similarly, subsequent photoactivation of intravascular SPIO nanoparticles could then be performed to induce selective photothermal destruction of unwanted vasculature.

Paper Details

Date Published: 1 January 2010
PDF: 5 pages
J. Biomed. Opt. 15(1) 011110 doi: 10.1117/1.3285612
Published in: Journal of Biomedical Optics Volume 15, Issue 1
Show Author Affiliations
Jeehyun Kim, Kyungpook National Univ. (Korea, Republic of)
Junghwan Oh, The Univ. of Texas M.D. Anderson Cancer Ctr. (United States)
Bernard Choi, Beckman Laser Institute and Medical Ctr. (United States)

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