Now showing items 21-26 of 26

    • Statistical analysis of fiber bundles using multi-tensor tractography: application to first-episode schizophrenia 

      Rathi, Yogesh; Kubicki, Marek R.; Bouix, Sylvain; Westin, Carl-Fredrik; Goldstein, Jill M.; Seidman, Larry Joel; Mesholam-Gately, Raquelle; McCarley, Robert William; Shenton, Martha Elizabeth (Elsevier BV, 2011)
      This work proposes a new method to detect abnormalities in fiber bundles of first-episode (FE) schizophrenia patients. Existing methods have either examined a particular region of interest (ROI) or used voxel based morphometry ...
    • Tensor kernels for simultaneous fiber model estimation and tractography 

      Rathi, Yogesh; Malcolm, James G.; Michailovich, Oleg; Westin, Carl-Fredrik; Shenton, Martha Elizabeth; Bouix, Sylvain (Wiley-Blackwell, 2010)
      This paper proposes a novel framework for joint orientation distribution function (ODF) estimation and tractography based on a new class of tensor-kernels. Existing techniques estimate the local fiber orientation at each ...
    • Two-Tensor Tractography Using a Constrained Filter 

      Malcolm, James G.; Shenton, Martha Elizabeth; Rathi, Yogesh (Springer Science + Business Media, 2009)
      We describe a technique to simultaneously estimate a weighted, positive-definite multi-tensor fiber model and perform tractography. Existing techniques estimate the local fiber orientation at each voxel independently so ...
    • Voxel-based morphometry (VBM) studies in schizophrenia—can white matter changes be reliably detected with VBM? 

      Melonakos, Eric D.; Shenton, Martha Elizabeth; Rathi, Yogesh; Terry, Douglas P.; Bouix, Sylvain; Kubicki, Marek R. (Elsevier BV, 2011)
      Voxel-Based Morphometry (VBM) is a hypothesis-free, whole-brain, voxel-by-voxel analytic method that attempts to compare imaging data between populations. Schizophrenia studies have utilized this method to localize differences ...
    • White Matter Bundle Registration and Population Analysis Based on Gaussian Processes 

      Wassermann, Demian; Rathi, Yogesh; Bouix, Sylvain; Kubicki, Marek R.; Kikinis, Ron; Shenton, Martha Elizabeth; Westin, Carl-Fredrik (Springer Science + Business Media, 2011)
      This paper proposes a method for the registration of white matter tract bundles traced from diffusion images and its extension to atlas generation. Our framework is based on a Gaussian process representation of tract density ...
    • White matter tract abnormalities between rostral middle frontal gyrus, inferior frontal gyrus and striatum in first-episode schizophrenia 

      Quan, Meina; Lee, Sang-Hyuk; Kubicki, Marek R.; Kikinis, Zora; Rathi, Yogesh; Seidman, Larry Joel; Mesholam-Gately, Raquelle; Goldstein, Jill M.; McCarley, Robert William; Shenton, Martha Elizabeth; Levitt, James Jonathan (Elsevier BV, 2013)
      Background—Previous studies have shown that frontostriatal networks, especially those involving dorsolateral prefrontal cortex (DLPFC) and ventrolateral prefrontal cortex (VLPFC) mediate cognitive functions some of which ...