Jos
P. Marques1,2, Rolf Gruetter1,3
1Centre d'Imagerie BioMdicale, EPFL,
Lausanne, Vaud, Switzerland; 2Department of Radiology, University
of Lausanne, Lausanne, Vaud, Switzerland; 3Department of
Radiology, Universities of Lausanne and Geneva, Switzerland
In
this work, the susceptibility of air was varied by changing its oxygen
fraction. Such a variation of the air susceptibility allowed to exclusively
map the contribution from oxygen towards the measured frequency shift maps in
phantoms and volunteers. This allowed removal of a significant part of the
observed frequency shift around air-water interfaces, making the frequency
shift maps more specific to their rich tissue contrast.