Finite pulse time effects in flash diffusivity measurements
β Scribed by Th. Lechner; E. Hahne
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 560 KB
- Volume
- 218
- Category
- Article
- ISSN
- 0040-6031
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π SIMILAR VOLUMES
Expressions for the effective diffusion times in multiple-gradient are of immediate utility in the analysis of experimental data. pulse diffusion measurements in liquid-saturated porous media These have been given, without derivation, in two previous are derived. This is necessary since the diffusio
## Abstract ## Purpose To characterize the effect of diffusion time on shortβrange hyperpolarized ^3^He magnetic resonance imaging (MRI) diffusion measurements across a wide range of emphysema severity. ## Materials and Methods ^3^He diffusion MRI was performed on 19 lungs or lobes resected from
Pulsed-field-gradient NMR techniques are demonstrated for measurements of time-dependent gas diffusion. The standard PGSE technique and variants, applied to a free gas mixture of thermally polarized xenon and O2, are found to provide a reproducible measure of the xenon diffusion coefficient (5.71 x