Research Article
Diffusion tensor fiber tracking of human brain connectivity: aquisition methods, reliability analysis and biological results
Article first published online: 5 DEC 2002
DOI: 10.1002/nbm.779
Copyright © 2002 John Wiley & Sons, Ltd.
Issue
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NMR in Biomedicine
Special Issue: Diffusion tensor imaging and axonal mapping - state of the art
Volume 15, Issue 7-8, pages 494–515, November - December 2002
Additional Information
How to Cite
Lori, N. F., Akbudak, E., Shimony, J. S., Cull, T. S., Snyder, A. Z., Guillory, R. K. and Conturo, T. E. (2002), Diffusion tensor fiber tracking of human brain connectivity: aquisition methods, reliability analysis and biological results. NMR Biomed., 15: 494–515. doi: 10.1002/nbm.779
Publication History
- Issue published online: 5 DEC 2002
- Article first published online: 5 DEC 2002
- Manuscript Revised: 9 DEC 2002
- Manuscript Accepted: 16 MAY 2002
- Manuscript Received: 24 JUL 2001
Funded by
- NIH. Grant Numbers: R01 NS39538, P01 NS06833, P20 MH62130
- Abstract
- Article
- References
- Cited By
Keywords:
- brain function;
- brain anatomy;
- white matter;
- MRI;
- diffusion tensor;
- connectivity
Abstract
We present a description, biological results and a reliability analysis for the method of diffusion tensor tracking (DTT) of white matter fiber pathways. In DTT, diffusion-tensor MRI (DT-MRI) data are collected and processed to visualize the line trajectories of fiber bundles within white matter (WM) pathways of living humans. A detailed description of the data acquisition is given. Technical aspects and experimental results are illustrated for the geniculo-calcarine tract with broad projections to visual cortex, occipital and parietal U-fibers, and the temporo-calcarine ventral pathway. To better understand sources of error and to optimize the method, accuracy and precision were analyzed by computer simulations. In the simulations, noisy DT-MRI data were computed that would be obtained for a WM pathway having a helical trajectory passing through gray matter. The error vector between the real and ideal track was computed, and random errors accumulated with the square root of track length consistent with a random-walk process. Random error was most dependent on signal-to-noise ratio, followed by number of averages, pathway anisotropy and voxel size, in decreasing order. Systematic error only occurred for a few conditions, and was most dependent on the stepping algorithm, anisotropy of the surrounding tissue, and non-equal voxel dimensions. Both random and systematic errors were typically below the voxel dimension. Other effects such as track rebound and track recovery also depended on experimental conditions. The methods, biological results and error analysis herein may improve the understanding and optimization of DTT for use in various applications in neuroscience and medicine. Copyright © 2002 John Wiley & Sons, Ltd.
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- DTT
diffusion tensor tracking
- DT-MRI
diffusion tensor MRI
- EPI
echo planar imaging
- GCT
geniculo-calcarine tract
- GM
gray matter
- RA
relative anisotropy
- SNR
signal-to-noise ratio
- SSV
spatial selection volume
- WM
white matter

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