Title page for ETD etd-09212010-215625


Type of Document Master's Thesis
Author Chambers, Micah Christopher
Author's Email Address micahc@vt.edu
URN etd-09212010-215625
Title Full Brain Blood-Oxygen-Level-Dependent Signal Parameter Estimation Using Particle Filters
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Wyatt, Christopher L. Committee Chair
Baumann, William T. Committee Member
Beex, A. A. Louis Committee Member
Stilwell, Daniel J. Committee Member
Keywords
  • BOLD Response
  • FMRI
  • Nonlinear Systems
  • Particle Filter
  • Bayesian Statistics
  • System Identification
Date of Defense 2010-09-14
Availability unrestricted
Abstract
Traditional methods of analyzing functional Magnetic Resonance Images use a linear combination of just a few static regressors. This work demonstrates an alternative approach using a physiologically inspired nonlinear model. By using a particle filter to optimize the model parameters, the computation time is kept below a minute per voxel without requiring a linearization of the noise in the state variables. The activation results show regions similar to those found in Statistical Parametric Mapping; however, there are some notable regions not detected by that technique. Though the parameters selected by the particle filter based approach are more than sufficient to predict the Blood-Oxygen-Level-Dependent signal response, more model constraints are needed to uniquely identify a single set of parameters. This illposed nature explains the large discrepancies found in other research that attempted to characterize the model parameters. For this reason the final distribution of parameters is more medically relevant than a single estimate. Because the output of the particle filter is a full posterior probability, the reliance on the mean to estimate parameters is unnecessary. This work presents not just a viable alternative to the traditional method of detecting activation, but an extensible technique of estimating the joint probability distribution function of the Blood-Oxygen-Level-Dependent Signal parameters.

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