نتایج جستجو برای: diffusion volume
تعداد نتایج: 469130 فیلتر نتایج به سال:
BACKGROUND It is generally agreed that diffusion of botulinum toxin occurs, but the extent of the spread and its clinical importance are disputed. Many factors have been suggested to play a role but which have the most clinical relevance is a subject of much discussion. METHODS This review discusses the variables affecting diffusion, including protein composition and molecular size as well as...
We study the global existence of classical solutions to volume–surface reaction–diffusion systems with control mass. Such appear naturally from modeling evolution concentrations or densities appearing both in a volume domain and its surface, therefore have attracted considerable attention. Due characteristic coupling, general is challenging issue. In particular, duality method, which powerful d...
Background: It is generally agreed that diffusion of botulinum toxin occurs, but the extent of the spread and its clinical importance are disputed. Many factors have been suggested to play a role but which have the most clinical relevance is a subject of much discussion. Methods: This review discusses the variables affecting diffusion, including protein composition and molecular size as well as...
Mapping mean axon diameter and intra-axonal volume fraction may have significant clinical potential because nerve conduction velocity is directly dependent on axon diameter, and several neurodegenerative diseases affect axons of specific sizes and alter axon counts. Diffusion-weighted MRI methods based on the pulsed gradient spin echo (PGSE) sequence have been reported to be able to assess axon...
IMAGE-HD is an Australian based multi-modal longitudinal magnetic resonance imaging (MRI) study in premanifest and early symptomatic Huntington's disease (pre-HD and symp-HD, respectively). In this investigation we sought to determine the sensitivity of imaging methods to detect macrostructural (volume) and microstructural (diffusivity) longitudinal change in HD. We used a 3T MRI scanner to acq...
BACKGROUND AND PURPOSE Diffusion-perfusion MRI in patients with anterior circulation occlusions has demonstrated salvage of threatened tissue after thrombolytic therapy. Similar studies have not been reported with posterior circulation occlusions. METHODS Patients with acute basilar artery occlusion treated with intra-arterial thrombolytics were studied with multimodal MRI before treatment, s...
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