Abstract：
:We report initial NMR studies of continuous flow laser-polarized xenon gas, both in unrestricted tubing, and in a model porous media. The study uses Pulsed Gradient Spin Echo-based techniques in the gas-phase, with the aim of obtaining more sophisticated information than just translational self-diffusion coefficients. Pulsed Gradient Echo studies of continuous flow laser-polarized xenon gas in unrestricted tubing indicate clear diffraction minima resulting from a wide distribution of velocities in the flow field. The maximum velocity experienced in the flow can be calculated from this minimum, and is seen to agree with the information from the complete velocity spectrum, or motion propagator, as well as previously published images. The susceptibility of gas flows to parameters such as gas mixture content, and hence viscosity, are observed in experiments aimed at identifying clear structural features from echo attenuation plots of gas flow in porous media. Gas-phase NMR scattering, or position correlation flow-diffraction, previously clearly seen in the echo attenuation data from laser-polarized xenon flowing through a 2 mm glass bead pack is not so clear in experiments using a different gas mixture. A propagator analysis shows most gas in the sample remains close to static, while a small portion moves through a presumably near-unimpeded path at high velocities.
journal_name
Magn Reson Imagingjournal_title
Magnetic resonance imagingauthors
Mair RW,Wang R,Rosen MS,Candela D,Cory DG,Walsworth RLdoi
10.1016/s0730-725x(03)00156-5subject
Has Abstractpub_date
2003-04-01 00:00:00pages
287-92issue
3-4eissn
0730-725Xissn
1873-5894pii
S0730725X03001565journal_volume
21pub_type
杂志文章abstract：PURPOSE:To systematically investigate the scan-rescan, intra-observer, and inter-observer reproducibility of an improved DANTE-SPACE sequence for the simultaneous assessment of intra- and extracranial arterial vessel wall morphology. MATERIALS AND METHODS:Thirty-five healthy volunteers and 10 patients with atheroscler...
journal_title：Magnetic resonance imaging
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abstract：PURPOSE:Although functional magnetic resonance imaging (fMRI) has revealed that spinal cord injury (SCI) causes anomalous changes in task-induced brain activation, its effect during the resting state remains unclear. The aim of this study is to explore the changes of the brain resting-state function in non-human primat...
journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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journal_title：Magnetic resonance imaging
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更新日期：2019-11-01 00:00:00
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doi：10.1016/j.mri.2011.10.003
更新日期：2012-04-01 00:00:00
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更新日期：2003-12-01 00:00:00
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journal_title：Magnetic resonance imaging
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