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Abstract #3294

Effect of Ion Size on Conductivity Measurements of MR-phase-based Electric Properties Tomography.

Jan Sedlacik 1 , Ulrich Katscher 2 , and Jens Fiehler 1

1 University Medical Center Hamburg-Eppendorf, Hamburg, Hamburg, Germany, 2 Philips Research Europe, Hamburg, Germany

MR-based Electric Properties Tomography (EPT) provides a non-invasive means to assess electric tissue properties such as conductivity. EPT was shown to depend on ion concentration and temperature. In this study the effect of ion size, and therefore ion mobility, was studied. The EPT-conductivity steeply changed between HCl and NaOH which is caused by the much smaller free protons of HCl as compared to NaOH. On the other side, the contribution of the much larger glutamate ion on EPT-conductivity is negligible, effectively bisecting the amount of EPT-detectable ions and resulting in nearly half conductivity of MSG as compared to NaCl.

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