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Proceedings Paper

Label free imaging system for measuring blood flow speeds using a single multi-mode optical fiber (Conference Presentation)
Author(s): Iliya Sigal; Antonio M. Caravaca Aguirre; Raanan Gad; Rafael Piestun; Ofer Levi
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Paper Abstract

We demonstrate a single multi-mode fiber-based micro-endoscope for measuring blood flow speeds. We use the transmission-matrix wavefront shaping approach to calibrate the multi-mode fiber and raster-scan a focal spot across the distal fiber facet, imaging the cross-polarized back-reflected light at the proximal facet using a camera. This setup allows assessment of the backscattered photon statistics: by computing the mean speckle contrast values across the proximal fiber facet we show that spatially-resolved flow speed maps can be inferred by selecting an appropriate camera integration time. The proposed system is promising for minimally-invasive studies of neurovascular coupling in deep brain structures.

Paper Details

Date Published: 26 May 2016
PDF: 1 pages
Proc. SPIE 9717, Adaptive Optics and Wavefront Control for Biological Systems II, 97171G (26 May 2016); doi: 10.1117/12.2213173
Show Author Affiliations
Iliya Sigal, Univ. of Toronto (Canada)
Antonio M. Caravaca Aguirre, Univ. of Colorado at Boulder (United States)
Raanan Gad, Univ. of Toronto (Canada)
Rafael Piestun, Univ. of Colorado at Boulder (United States)
Ofer Levi, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 9717:
Adaptive Optics and Wavefront Control for Biological Systems II
Thomas G. Bifano; Joel Kubby; Sylvain Gigan, Editor(s)

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