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Proceedings Paper

System design for spectrally encoded video-rate near infrared tomography during magnetic resonance imaging of the breast
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Paper Abstract

Video rate diffuse tomography can be implemented within the magnetic resonance breast exam. The following paper outlines the basics of a spectrally encoded source set up, being designed and tested for use in breast imaging within a specialized breast surface coil. The system design maximizes input power to the breast, while confining the spectrum to a 10 nm bandwidth of near-infrared light. The center spectral band can be varied, since it is supplied by a tunable Ti:Sapphire laser. The encoding of each source is achieved by splitting the signal into individual nanometer bands through a high resolution grating, and focusing the output of this into each source fiber. This source configuration then requires spectral detection at the output, and so each detection fiber is delivered to a high resolution spectrometer to resolve the detected intensities. Breast imaging with this system has some subtle dynamic range issues, which means that light from sources farthest from the detector pickup are likely not providing useful data, but the closest 4-6 fibers near each source can provide useful data. The implementation of this is being carried out within a magnetic resonance breast array, and initial testing of the signals is shown, along with diagrams and photographs of the system configuration.

Paper Details

Date Published: 20 February 2008
PDF: 6 pages
Proc. SPIE 6850, Multimodal Biomedical Imaging III, 68500H (20 February 2008); doi: 10.1117/12.778326
Show Author Affiliations
Brian W. Pogue, Dartmouth College (United States)
Zhiqiu Li, Dartmouth College (United States)
Colin Carpenter, Dartmouth College (United States)
Ashley Laughney, Dartmouth College (United States)
Venkataramanan Krishnaswamy, Dartmouth College (United States)
Scott C. Davis, Dartmouth College (United States)
Shudong Jiang, Dartmouth College (United States)
Keith D. Paulsen, Dartmouth College (United States)

Published in SPIE Proceedings Vol. 6850:
Multimodal Biomedical Imaging III
Fred S. Azar; Xavier Intes, Editor(s)

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