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Abstract #0500

The variability of MR axon radii estimates in the human white matter

Jelle Veraart1, Erika P. Raven1, Luke J. Edwards2, Nikolaus Weiskopf2,3, and Derek K. Jones4,5
1Center for Biomedical Imaging, NYU Grossman School of Medicine, New York, NY, United States, 2Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany, 3Felix Bloch Institute for Solid State Physics, Leipzig University, Leipzig, Germany, 4School of Psychology, Cardiff University, Cardiff, United Kingdom, 5Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Australia

The accuracy of the quantification of axon radii in vivo using diffusion MRI has been promoted in recent years by hardware developments and novel biophysical modeling insights. The MR-derived effective radii are in good quantitative agreement with histology if one accounts for the intrinsic bias of diffusion MRI to larger axons. In this work, we show that the translation of MR axon diameter mapping to human neuroimaging is possible within acceptable scan times if strong diffusion-weighting gradients are available. Indeed, we demonstrate that the MR-derived effective axon radii is a reproducible and sensitive metric, with interesting inter- and along-tract variability.

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