نتایج جستجو برای: diffusivity

تعداد نتایج: 8606  

2014
Lauren Walker Wijitha Senadeera

An investigation of the drying of spherical food particles was performed, using peas as the model material. In the development of a mathematical model for drying curves, moisture diffusion was modelled using Fick’s second law for mass transfer. The resulting partial differential equation was solved using a forward-time central-space finite difference approximation, with the assumption of variab...

2013
Rebecca J. Theilmann Jason D. Reed David D. Song Mingxiong X. Huang Roland R. Lee Irene Litvan Deborah L. Harrington

Diffusion tensor imaging (DTI) findings from emerging studies of cortical white-matter integrity in Parkinson's disease (PD) without dementia are inconclusive. When white-matter changes have been found, their relationship to cognitive functioning in PD has not been carefully investigated. To better characterize changes in tissue diffusivity and to understand their functional significance, the p...

2017
Eiji Yamamoto Takuma Akimoto Antreas C. Kalli Kenji Yasuoka Mark S. P. Sansom

Pleckstrin homology (PH) domains are membrane-binding lipid recognition proteins that interact with phosphatidylinositol phosphate (PIP) molecules in eukaryotic cell membranes. Diffusion of PH domains plays a critical role in biological reactions on membrane surfaces. Although diffusivity can be estimated by long-time measurements, it lacks information on the short-time diffusive nature. We rev...

2014
Wei-Che Lin Kun-Hsien Chou Chao-Long Chen Hsiu-Ling Chen Cheng-Hsien Lu Shau-Hsuan Li Chu-Chung Huang Ching-Po Lin Yu-Fan Cheng

Cerebral edema is the common pathogenic mechanism for cognitive impairment in minimal hepatic encephalopathy. Whether complete reversibility of brain edema, cognitive deficits, and their associated imaging can be achieved after liver transplantation remains an open question. To characterize white matter integrity before and after liver transplantation in patients with minimal hepatic encephalop...

Journal: :AJNR. American journal of neuroradiology 2016
S B Strauss N Kim C A Branch M E Kahn M Kim R B Lipton J M Provataris H F Scholl M E Zimmerman M L Lipton

BACKGROUND AND PURPOSE Mild traumatic brain injury results in a heterogeneous constellation of deficits and symptoms that persist in a subset of patients. This prospective longitudinal study identifies early diffusion tensor imaging biomarkers of mild traumatic brain injury that significantly relate to outcomes at 1 year following injury. MATERIALS AND METHODS DTI was performed on 39 subjects...

Journal: :AJNR. American journal of neuroradiology 2009
J I Berman H C Glass S P Miller P Mukherjee D M Ferriero A J Barkovich D B Vigneron R G Henry

BACKGROUND AND PURPOSE Many prematurely born neonates have abnormalities of vision or visual processing. This study tests the hypothesis that a correlation exists between the microstructure of the optic radiation and visual performance in premature neonates. MATERIALS AND METHODS Diffusion tensor imaging (DTI) was performed on 36 premature neonates ranging in age from 29 to 41 weeks of gestat...

Journal: :AJNR. American journal of neuroradiology 2005
Andrew J Fabiano Mark A Horsfield Rohit Bakshi

BACKGROUND AND PURPOSE Previous neuroimaging studies have suggested asymmetries in brain diffusivity may exist. The purpose of this study was to assess whether water diffusivity in deep gray matter structures shown by diffusion-weighted (DW) imaging differs between the right and left cerebral hemispheres in normal individuals. METHODS Brain MR imaging was obtained in 23 healthy volunteers. A ...

Journal: :AJNR. American journal of neuroradiology 2014
G Aghakhanyan A Martinuzzi F Frijia M Vavla H Hlavata A Baratto N Martino G Paparella D Montanaro

BACKGROUND AND PURPOSE The hereditary spastic paraplegias are a group of genetically heterogeneous neurodegenerative disorders, characterized by progressive spasticity and weakness of the lower limbs. Although conventional brain MR imaging findings are normal in patients with pure hereditary spastic paraplegia, microstructural alteration in the cerebral WM can be revealed with DTI. Concomitant ...

Journal: :AJNR. American journal of neuroradiology 2017
J E F Moonen J C Foster-Dingley A A van den Berg-Huijsmans W de Ruijter A J M de Craen J van der Grond R C van der Mast

BACKGROUND AND PURPOSE Small vessel disease is a major cause of neurocognitive dysfunction in the elderly. Small vessel disease may manifest as white matter hyperintensities, lacunar infarcts, cerebral microbleeds, and atrophy, all of which are visible on conventional MR imaging or as microstructural changes determined by diffusion tensor imaging. This study investigated whether microstructural...

2011
C. Pfrang M. Shiraiwa

Recent experimental evidence underlines the importance of reduced diffusivity in amorphous semi-solid or glassy atmospheric aerosols. This paper investigates the impact of diffusivity on the ageing of multi-component reactive organic particles approximating atmospheric cooking aerosols. We apply and extend the recently developed KMSUB model in a study of a 12-component mixture containing oleic ...

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