Abstract #3289
GEOMETRICAL SHIFT RESULTS IN ERRONEOUS APPEARANCE OF LOW FREQUENCY TISSUE EDDY CURRENT INDUCED PHASE MAPS: THEORY, SIMULATIONS AND MEASUREMENTS
S. Mandija 1 , A.L.H.M.W. van Lier 1 , P. Petrov 2 , S.W.F. Neggers 2 , P.R. Luijten 1 , and C.A.T. van den Berg 1
1
Imaging Division, UMC Utrecht, Utrecht,
Netherlands,
2
Brain
Center Rudolf Magnus, UMC Utrecht, Utrecht, Netherlands
In this abstract we demonstrate that combinations of
phase maps obtained with different gradient polarities
should be done carefully since these images are prone to
geometrical shift leading to RF phase falsely attributed
to LF phase. Since the RF phase is related to
conductivity at MHz frequency, because of this
geometrical displacement it appears that the LF phase is
also proportional to electrical conductivity. Instead,
as shown in simulations, if corrections are performed,
the LF phase is not measurable anymore, thus the scaling
of the LF phase with the conductivity can be attributed
to the RF phase leakage.
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