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    Using high-resolution quantitative mapping of R1 as an index of cortical myelination

    Lutti, A. and Dick, Frederic and Sereno, Martin I. and Weiskopf, N. (2014) Using high-resolution quantitative mapping of R1 as an index of cortical myelination. NeuroImage 93 (2), pp. 176-188. ISSN 1053-8119.

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    Abstract

    A fundamental tenet of neuroscience is that cortical functional differentiation is related to the cross-areal differences in cyto-, receptor-, and myeloarchitectonics that are observed in ex-vivo preparations. An ongoing challenge is to create non invasive magnetic resonance (MR) imaging techniques that offer sufficient resolution, tissue contrast, accuracy and precision to allow for characterization of cortical architecture over an entire living human brain. One exciting development is the advent of fast, high-resolution quantitative mapping of basic MR parameters that reflect cortical myeloarchitecture. Here, we outline some of the theoretical and technical advances underlying this technique, particularly in terms of measuring and correcting for transmit and receive radio frequency field inhomogeneities. We also discuss new directions in analytic techniques, including higher resolution reconstructions of the cortical surface. We then discuss two recent applications of this technique. The first compares individual and group myelin maps to functional retinotopic maps in the same individuals, demonstrating a close relationship between functionally and myeloarchitectonically defined areal boundaries (as well as revealing an interesting disparity in a highly studied visual area). The second combines tonotopic and myeloarchitectonic mapping to localize primary auditory areas in individual healthy adults, using a similar strategy as combined electrophysiological and post-mortem myeloarchitectonic studies in non-human primates.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): quantitative, MRI, anatomy, R1, T1, myelin, myeloarchitecture, visual, auditory
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Research Centre: Brain and Cognitive Development, Centre for (CBCD)
    Depositing User: Administrator
    Date Deposited: 10 Jun 2013 06:58
    Last Modified: 02 Dec 2016 11:18
    URI: http://eprints.bbk.ac.uk/id/eprint/7415

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