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Abstract #3015

Removing Air-Tissue Artifacts in Phase Images by Modulating the Air Susceptibility

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.