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Abstract #4848

Accurate Measurement of MRI Gradient Characteristics

Gerald B Matson 1,2 and Hui Liu 1

1 Center for Imaging of Neurodegenerative Diseases, Department of Veterans Affairs, San Francisco, California, United States, 2 Pharmaceutical 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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