Accurate Measurement of MRI Gradient Characteristics
Gerald B Matson 1,2 and Hui Liu 1
Center for Imaging of Neurodegenerative
Diseases, Department of Veterans Affairs, San Francisco,
California, United States,
Chemistry, University of California, San Francisco, San
Francisco, California, United States
The imperfect fidelity of MRI gradient systems results
in altered k-space trajectories, which can result in
image degradation. Under the assumption that the
gradient system is linear and time invariant, accurate
measurement of the MRI gradient impulse response
function (GIRF) can be used to predict the actual output
gradient waveform as opposed to the requested waveform.
In this study we demonstrate a simple sample and coil
arrangement can be used to obtain GIRFs of high
precision that can accurately predict gradient output
waveforms. This capability could potentially be used to
predict actual k-space trajectories for improved
fidelity of image reconstruction.
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