Observation of restricted diffusion in the presence of a free diffusion compartment: Single- and double-PFG experiments
نویسندگان
چکیده
منابع مشابه
Observation of restricted diffusion in the presence of a free diffusion compartment: single- and double-PFG experiments.
Theoretical and experimental studies of restricted diffusion have been conducted for decades using single pulsed field gradient (s-PFG) diffusion experiments. In homogenous samples, the diffusion-diffraction phenomenon arising from a single population of diffusing species has been observed experimentally and predicted theoretically. In this study, we introduce a composite bi-compartmental model...
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Figure 3. Angular d-PFG experiments performed on a bi-compartmental phantom consisting of microcapillaries with inner diameter of 19 μm in the SDC and 20 μl of water in the FDC. The diffusion periods were sufficiently long to probe the boundaries. Symbols represent experimental data, while the solid lines represent the theoretical fitting to the experimental data. Accounting for free and restri...
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Using pulsed-field-gradient (PFG) experiments, the sizes of the pores in ordered porous media can be estimated from the diffraction-like non-monotonic patterns that the signal attenuation curves exhibit [1]. A different diffraction pattern is observed when the experiment is extended to a larger number (N) of diffusion gradient pulse pairs as shown in Figure 1. When gradients of the same strengt...
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Repeated application of diffusion gradient pulse pairs [1] in a pulsed field gradient (PFG) experiment provides important insights into pore microstructure. For example, the dimensions and eccentricity of yeast cells were measured from the fourth order term of the double-PFG signal attenuation when the mixing time between the two encoding blocks is long [2]. In this abstract, we propose an alte...
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One of the most important attributes of diffusion NMR is that it can employ restricted diffusion to probe microstructures of opaque samples. The single-pulsed-field-gradient (s-PFG) methodology (Fig. 1A) employs a pair of diffusion-sensitizing PFGs that are separated by an interval in which the diffusion process takes place. When a specimen is characterized by a very narrow size distribution or...
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ژورنال
عنوان ژورنال: Journal of Magnetic Resonance
سال: 2009
ISSN: 1090-7807
DOI: 10.1016/j.jmr.2009.07.005