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Activity Number:
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322
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Type:
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Topic Contributed
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Date/Time:
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Tuesday, July 31, 2007 : 2:00 PM to 3:50 PM
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Sponsor:
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Biometrics Section
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| Abstract - #309908 |
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Title:
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Estimation of Pre-Post Surgical Changes in the fMRI Visual Field Map
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Author(s):
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Raymond Hoffmann*+ and Edgar A. DeYoe and Mary Jo Maciejewski and Daniel Rowe
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Companies:
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Medical College of Wisconsin and The Medical College of Wisconsin and Marquette University and Medical College of Wisconsin
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Address:
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1210 Larchmont Drive, Waukesha, WI, 53186,
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Keywords:
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fMRI ; Spatial Statistics ; Bayesian ; image analysis
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Abstract:
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The visual field map is produced by mapping active voxels of the visual cortex onto a circular disk corresponding to the points of a circular visual target. The location of areas on the target can be identified by the temporal course of the fMRI (functional Magnetic Resonance Image) signal in the visual cortex. Each scan (pre-surgical and post-surgical) produces a different set of points due to due to noise and variability in the positioning of the head between scans. The observed data is a non-homogeneous 2-dimensional point process with higher density in the center corresponding to the larger area of the visual cortex that is connected to the center of the retina. The underlying process intensity is estimated both by a 2D nonparametric smoother and a non-parametric 2D Dirichlet prior on the visual field. The posterior density is used to estimate the probability of change.
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