The elimination of magnetic susceptibility artifacts in the micro-image of liquid-solid interfaces: internal gradient modulation by the CPMG RF train.
Distortions of magnetic resonance images near solid-liquid interface appear as the result of the restriction to spin self-diffusion in the proximity of impermeable boundary as well as of a susceptibility difference. The spectral analysis of spin echo enables to resolve, in a simple way, how various RF-gradient pulse sequences reduce the effect of the internal magnetic field induced by the susceptibility difference at interfaces. The 1D diffusion-weighted imaging of water in the narrow notch tested efficiency of some sequence. The notch was milled in a piece of Plexiglas. The method can be used to distinguish the susceptibility effect from the effects of applied gradients when investigating the transport of fluid through a porous structure.
Duh
Andrej
A
Faculty of Electrical Engineering and Computer Science, Institute of Mathematics and Physics, University of Maribor, Smetanova 17, 2000, Maribor, Slovenia. andrej@fiz.uni-lj.si
Mohoric
Ales
A
Stepisnik
Janez
J
Sersa
Igor
I