Marlies Friese1,2, Roberta Santarelli2,
Lionel Martin2, Luc Darrasse2, Ralph Sinkus3,
Xavier Matre2
1Center for Magnetic Resonance, The
University of Queensland, Brisbane, Queensland, Australia; 2Imagerie
par Rsonance Magntique et MultiModalits (UMR8081), Univ Paris-Sud, CNRS,
Orsay, France; 3Institut Langevin (UMR 7587), ESPCI, Univ Denis
Diderot, CNRS, Paris, France
Magnetic
resonance elastography is performed in a pig lung inflated with three
different gases, helium-4 (4He), air and sulphur hexafluoride (SF6), in a
phantom designed for voxel-by-voxel
comparison. Proton MRI
morphology and computed l, Gd and Gl maps
were compared on a voxel-by-voxel basis by computing mean differences
between corresponding voxels. Voxel-by-voxel comparison of Morphology data
and l values shows good agreement between air/4He, Air/Air and Air/SF6
measurements while Gd and Gl values agree less well. Global values of Gl, Gd
and l are in excellent agreement for the different gases, showing gas density
does not affect MRE measurement.