Effect of Ion Size on Conductivity Measurements of MR-phase-based Electric Properties Tomography.
Jan Sedlacik 1 , Ulrich Katscher 2 , and Jens Fiehler 1
University Medical Center Hamburg-Eppendorf,
Hamburg, Hamburg, Germany,
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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