title: White matter organization in relation to upper limb motor control in healthy subjects: exploring the added value of diffusion kurtosis imaging.
abstract: Diffusion tensor imaging (DTI) characterizes white matter (WM) microstructure. In many brain regions, however, the assumption that the diffusion probability distribution is Gaussian may be invalid, even at low b values. Recently, diffusion kurtosis imaging (DKI) was suggested to more accurately estimate this distribution. We explored the added value of DKI in studying the relation between WM microstructure and upper limb coordination in healthy controls (N = 24). Performance on a complex bimanual tracking task was studied with respect to the conventional DTI measures (DKI or DTI derived) and kurtosis metrics of WM tracts/regions carrying efferent (motor) output from the brain, corpus callosum (CC) substructures and whole brain WM. For both estimation models, motor performance was associated with fractional anisotropy (FA) of the CC-genu, CC-body, the anterior limb of the internal capsule, and whole brain WM (r s range 0.42-0.63). Although DKI revealed higher mean, radial and axial diffusivity and lower FA than DTI (p < 0.001), the correlation coefficients were comparable. Finally, better motor performance was associated with increased mean and radial kurtosis and kurtosis anisotropy (r s range 0.43-0.55). In conclusion, DKI provided additional information, but did not show increased sensitivity to detect relations between WM microstructure and bimanual performance in healthy controls.
authors.affiliation: Motor Control and Neuroplasticity Research Group, Department of Kinesiology, Group Biomedical Sciences, KU Leuven, Tervuursevest 101, Bus 1501, 3001, Heverlee, Belgium, Jolien.Gooijers@faber.kuleuven.be.
authors.forename: J
authors.initials: J
authors.lastname: Gooijers
authors.forename: A
authors.initials: A
authors.lastname: Leemans
authors.forename: S
authors.initials: S
authors.lastname: Van Cauter
authors.forename: S
authors.initials: S
authors.lastname: Sunaert
authors.forename: S P
authors.initials: SP
authors.lastname: Swinnen
authors.forename: K
authors.initials: K
authors.lastname: Caeyenberghs
mesh_terms: D000328:Adult; D000578:Amidines / Q000378:metabolism; D000818:Animals; D016880:Anisotropy; D001921:Brain / Q000033:anatomy & histology*; D003337:Corpus Callosum / Q000502:physiology*; D056324:Diffusion Tensor Imaging; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D016011:Normal Distribution; D011597:Psychomotor Performance / Q000502:physiology*; D018709:Statistics, Nonparametric; D034941:Upper Extremity / Q000294:innervation*; D055815:Young Adult
chemical_list: D000578:Amidines; C031455:diamidino compound 253-50