Investigating the field-dependence of the Davis model: Calibrated fMRI at 1.5, 3 and 7 tesla
Hannah V Hare 1 , Nicholas P Blockley 1 , Alexander G Gardener 1 , Michael A Germuska 1 , Stuart Clare 1 , and Daniel P Bulte 1
FMRIB, University of Oxford, Oxford, United
Calibrated functional MRI (fMRI) is most often performed
at 3T, but there is increasing interest in implementing
this method on 7T research and 1.5T clinical systems. It
is currently unclear whether this affects the accuracy
of the resultant measurements of oxygen metabolism. We
investigated the robustness of such measurements by
performing the same calibrated fMRI protocol at 1.5, 3
and 7T. The calibration parameter M was found to
increase predictably with field strength, whilst the
estimated change in oxygen metabolism in response to a
motor task was independent of field strength.
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