title: Diffusion MRI and its Role in Neuropsychology.
abstract: Diffusion Magnetic Resonance Imaging (dMRI) is a popular method used by neuroscientists to uncover unique information about the structural connections within the brain. dMRI is a non-invasive imaging methodology in which image contrast is based on the diffusion of water molecules in tissue. While applicable to many tissues in the body, this review focuses exclusively on the use of dMRI to examine white matter in the brain. In this review, we begin with a definition of diffusion and how diffusion is measured with MRI. Next we introduce the diffusion tensor model, the predominant model used in dMRI. We then describe acquisition issues related to acquisition parameters and scanner hardware and software. Sources of artifacts are then discussed, followed by a brief review of analysis approaches. We provide an overview of the limitations of the traditional diffusion tensor model, and highlight several more sophisticated non-tensor models that better describe the complex architecture of the brain's white matter. We then touch on reliability and validity issues of diffusion measurements. Finally, we describe examples of ways in which dMRI has been applied to studies of brain disorders and how identified alterations relate to symptomatology and cognition.
authors.affiliation: Department of Psychiatry, Medical School, University of Minnesota, 717 Delaware St SE, Suite 516, Minneapolis, MN, 55414, USA.
authors.forename: Bryon A
authors.initials: BA
authors.lastname: Mueller
authors.forename: Kelvin O
authors.initials: KO
authors.lastname: Lim
authors.forename: Laura
authors.initials: L
authors.lastname: Hemmy
authors.forename: Jazmin
authors.initials: J
authors.lastname: Camchong
mesh_terms: D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology* / Q000473:pathology*; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D056324:Diffusion Tensor Imaging / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D009434:Neural Pathways / Q000033:anatomy & histology / Q000473:pathology; D009484:Neuropsychology / Q000379:methods*; D015203:Reproducibility of Results; D066127:White Matter / Q000033:anatomy & histology* / Q000473:pathology*