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Abstract #0680

B 0 Drift and Respiratory Motion Correction by Dual-Echo Susceptibility Correction (DESC)

Di Xu 1,2 , Steven M Shea 1,3 , Wesley D Gilson 1 , and Sunil G Patil 1

1 Center for Applied Medical Imaging, Imaging and Computer Vision, Siemens Corporation, Corporate Technology, Baltimore, Maryland, United States, 2 Department of Biomedical Engineering, Johns Hopkins University, School of Medicine, Baltimore, Maryland, United States, 3 Department of Radiology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL, United States

A new B 0 correction method known as Dual-Echo Susceptibility Correction (DESC) for Echo-planar (EP) based magnetic resonance imaging (MRI) is introduced. The proposed DESC method is comprised of 1) an acquisition of two EPI echoes; 2) modeling the susceptibility changes from B0 drift and respiratory motion using a smoothing polynomial function and 3) an iterative reconstruction framework to accurately estimate B0 corrected data. The DESC method is evaluated in an MR thermometry application as a proof of concept. It is shown that the DESC method reduces B 0 drift and respiratory motion-related inaccuracies, while being computationally efficient.

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