Abstract #2319
Real-time distortion correction of spiral MRI using the gradient system impulse response function
Adrienne E Campbell-Washburn 1 , Hui Xue 1 , Robert J Lederman 1 , Anthony Z Faranesh 1 , and Michael S Hansen 1
1
Division of Intramural Research, National
Heart, Lung and Blood Institute, National Institutes of
Health, Bethesda, Maryland, United States
Spiral MRI is fast and low SAR, and therefore has
potential utility for MR-guided interventions. To remove
distortions in spiral MR images, gradient waveform
imperfections must be corrected. In this abstract, the
measured gradient system impulse response function is
used to correct k-space trajectories in real-time for
arbitrary image orientations and is demonstrated to
remove image distortions in a phantom. In addition, an
interactive off-resonance reconstruction is used to
de-blur image regions of interest. In vivo, spiral
imaging is performed with 10-15 frames/second. The
introduction of these real-time distortion corrections
will make spiral MR-guided interventions feasible.
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