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.