High resolution whole brain diffusion imaging at 7 T for the Human Connectome Project

Vu, A.T. and Auerbach, E. and Lenglet, C. and Moeller, S. and Sotiropoulos, Stamatios N. and Jbabdi, S. and Andersson, J. and Yacoub, E. and Ugurbil, K. (2015) High resolution whole brain diffusion imaging at 7 T for the Human Connectome Project. NeuroImage, 122 . pp. 318-331. ISSN 1095-9572

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Abstract

Mapping structural connectivity in healthy adults for the Human Connectome Project (HCP) benefits from high quality, high resolution, multiband (MB)-accelerated whole brain diffusion MRI (dMRI). Acquiring such data at ultrahigh fields (7 T and above) can improve intrinsic signal-to-noise ratio (SNR), but suffers from shorter T2 and T2⁎ relaxation times, increased B1+ inhomogeneity (resulting in signal loss in cerebellar and temporal lobe regions), and increased power deposition (i.e. specific absorption rate (SAR)), thereby limiting our ability to reduce the repetition time (TR). Here, we present recent developments and optimizations in 7 T image acquisitions for the HCP that allow us to efficiently obtain high quality, high resolution whole brain in-vivo dMRI data at 7 T. These data show spatial details typically seen only in ex-vivo studies and complement already very high quality 3 T HCP data in the same subjects. The advances are the result of intensive pilot studies aimed at mitigating the limitations of dMRI at 7 T. The data quality and methods described here are representative of the datasets that will be made freely available to the community in 2015.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine
Identification Number: 10.1016/j.neuroimage.2015.08.004
Depositing User: Eprints, Support
Date Deposited: 05 Apr 2018 10:42
Last Modified: 05 Apr 2018 13:18
URI: http://eprints.nottingham.ac.uk/id/eprint/50959

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