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Home arrow Computer Science arrow Computational Diffusion MRI: MICCAI Workshop, Athens, Greece, October 2016

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Performance Evaluation

The proposed method was evaluated on MRI datasets of 15 healthy volunteers from the Human Connectome Project (HCP), Wu-Minn[1] database . The acquisition protocol included three shells (b-values of 1000, 2000, 3000), 96 unique directions for each, isotropic resolution of 1.25 mm and imaging matrix of 144 x 168 x 111 pixels [11]. The diffusion data were preprocessed using the HCP diffusion pipelines [12], which included susceptibility, eddy-current and motion distortions correction, and registration to a common space. WM fibers were obtained using Q-Space Diffeomorphic Reconstruction (QSDR) reconstruction and tractography by DSI- Studio.[2] Tractography was terminated upon reaching 1M fibers. In this section we evaluate the performance of the proposed scheme. There are three main aspects we would like to explore: how well does the sparse representation approximate the original fibers; how well is the original similarity measure approximated by CWDS; and is it possible to use a common dictionary for different fiber-sets. The experiments that are described next shed some light on these questions.

  • [1] http://www.humanconnectome.org.
  • [2] Developed by Fang-Cheng Yeh from the Advanced Biomedical MRI Lab, National TaiwanUniversity Hospital, Taiwan, and made available at http://dsi-studio.labsolver.org/Download/.
 
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