Eddy current characterization and correction using field monitoring for diffusion weighted imaging with maximal strength of 250 mT/m
Yi-Cheng Hsu1,2, Ying-Hua Chu1,2, Thomas Witzel3, Qiuyun Fan3, and Fa-Hsuan Lin2
1Dept. of Radiology, Medical Physics, Medical Center University of Freiburg, Faculty of Medicine, Freiburg, Germany, 2Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan, 3Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Harvard Medical School, Massachusetts General Hospital, Charlestown, MA, United States
We used a 24-channel field probe array to characterize the eddy current in a connectome scanner during diffusion weighted imaging with the maximal strength of 250 mT/m. Image distortion can be reduced by field monitoring but noticeable artifact remained after characterizing the eddy by up the 3rd-order spherical harmonics. We also found that eddy current lasted longer than 1 s. Our results suggested that the connectome scanner is not a linear time-invariant system, where concurrent field monitoring and high-order spherical harmonics characterization are desired.
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