Abstract #5334

Eddy current characterization and correction using field monitoring for diffusion weighted imaging with maximal strength of 250 mT/m

Yi-Cheng Hsu^1,2, Ying-Hua Chu^1,2, 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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