منابع مشابه
Evaluation of Diffusion Anisotropy and Diffusion Shape in Grading of Glial Tumors
Background: The most common primary tumors of brain are gliomas. Grading of tumor is vital for designing proper treatment plans. The gold standard choice to determine the grade of glial tumor is biopsy which is an invasive method.Objective: In this study, we try to investigate the role of fractional anisotropy (diffusion anisotropy) and linear anisotropy ...
متن کاملAssessment of Diffusion Anisotropy of White Matter in Areas of the Brain with crossing fibers: A simulation study
Introduction: We present a model of simulation of diffusion in white matter. This model has been used in Diffusion Weighted Imaging researches as a tool for employing cylindrically constrained two-tensor models to identify two independent directions within a voxel and assessing the orientation angle as a parameter that influence on fractional anisotropy. Materials a...
متن کاملIntrinsic diffusion of hydrogen on rutile TiO2(110).
The combined experimental and theoretical study of intrinsic hydrogen diffusion on bridge-bonded oxygen (BBO) rows of TiO 2(110) is presented. Sequences of isothermal scanning tunneling microscopy images demonstrate a complex behavior of hydrogen formed by water dissociation on BBO vacancies. Different diffusion rates are observed for the two hydrogens in the original geminate OH pair suggestin...
متن کاملHigher anisotropy in Diffusion Spectrum Imaging at longer diffusion times
Target audience Scientists and clinicians interested in Diffusion Spectrum MRI and its methodological development Purpose To demonstrate that Diffusion Spectrum Imaging at longer diffusion times gives rise to higher anisotropy measures, as illustrated by using a stimulated echo sequence in a clinical scanner in vivo. Diffusion Spectrum MRI (DSI) [1] has become a powerful tool for non-invasive i...
متن کاملDiffusion anisotropy in the corpus callosum.
BACKGROUND AND PURPOSE The corpus callosum is a heterogeneous white-matter tract that connects the cerebral hemispheres. The purpose of this investigation was to study its microstructural architecture in normal human adult brains by using diffusion tensor imaging (DTI). METHODS Two hundred consecutive patients referred for brain MR imaging underwent additional DTI with a high gradient field s...
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ژورنال
عنوان ژورنال: Nature
سال: 1969
ISSN: 0028-0836,1476-4687
DOI: 10.1038/222079a0