Jos Pedro Marques1, Rolf Gruetter1
1Centre d'Imagerie BioMdicale, Ecole Polytechnique Fdrale de Lausanne, Lausanne, Vaud, Switzerland
The tissue phase variations between grey and white matter are thought to originate from either tissue susceptibility variations or variations of macromolecule content affecting the water chemical shift. In this abstract we test these two hypotheses by trying to fit a high resolution fieldmap with the expected spatial distribution calculated after segmentation of a high resolution T1 weighted image. Results tentatively suggest the dominance of a non-susceptibility origin.