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Activity Number:
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494
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Type:
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Topic Contributed
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Date/Time:
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Thursday, August 2, 2007 : 8:30 AM to 10:20 AM
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Sponsor:
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Biometrics Section
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| Abstract - #308852 |
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Title:
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FMRI Statistical Brain Activation from k-Space Data
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Author(s):
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Daniel Rowe*+
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Companies:
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Medical College of Wisconsin
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Address:
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Department of Biophysics, Milwaukee, WI, 53226,
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Keywords:
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complex-valued ; k-space ; fMRI ; brain activation
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Abstract:
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In fMRI brain activation is commonly performed in terms of voxel time series measurements after image reconstruction. The image reconstruction and statistical activation processes are treated separately. The relationship between complex-valued k-space measurements and complex-valued image measurements is summarized. The voxel time-series measurements are written in terms of spatio-temporal k-space measurements. FMRI activation is determined in image space in terms of the original k-space measurements. Additionally, the spatio-temporal covariance between reconstructed complex-valued voxel time series can be written in terms of the spatio-temporal covariance between complex-valued k-space measurements. This allows one to utilize the originally measured data in its more naturally acquired state rather than in a transformed state. This allows statistical modeling in k-space.
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