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Journal of Biomedical Optics

Rapid near-infrared diffuse tomography for hemodynamic imaging using a low-coherence wideband light source
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Paper Abstract

Rapid near-infrared (NIR) diffuse optical tomography is implemented using a low-coherence source. The spectral bandwidth of the low-coherence source is dispersed and coupled to linearly bundled fibers, such that "spread"-spectral encoding among the bundled fibers is formed, and could be used for parallel source illumination onto tissue. In comparison with a previous spectral-encoding technique that employed multiple laser diodes, the use of a low-coherence source for spread-spectral encoding presents a few unique characteristics: (1) it provides shift-free spectral encoding; (2) it reduces the reconstruction uncertainty significantly owing to the minimization of spontaneous channel-to-channel intensity fluctuation; and (3) it enables the implementation of NIR tomography into an endoscopic imaging mode. A 20-mW superluminescent diode centered at 840 nm with a 40-nm bandwidth is used as the source, and a sampling speed of 5 Hz is obtained in a 27-mm imaging array consisting of eight sources and eight detection channels. The principles of using a low-coherence source for spread-spectral encoding are elaborated, the characteristic performances are demonstrated, and the preliminary results of imaging hemoglobin absorption variations during 10 s of voluntary breath-holding are presented.

Paper Details

Date Published: 1 January 2007
PDF: 12 pages
J. Biomed. Opt. 12(1) 014016 doi: 10.1117/1.2709636
Published in: Journal of Biomedical Optics Volume 12, Issue 1
Show Author Affiliations
Daqing Piao, Oklahoma State Univ. (United States)
Brian W. Pogue, Dartmouth College (United States)

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