A fast volumetric imaging technique has been demonstrated for imaging fluids contained in porous media. The 2D π-modified EPI or PEPI technique forms part of a novel 3D imaging technique which incorporates a z-axis phase-encoding procedure to yield a 3D PEPI hybrid. Full isotropically resolved data sets with good S/N ratio may be acquired in several minutes using the 3D PEPI hybrid. This is in contrast to acquisition times of several hours for standard 3D imaging techniques.
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