Imaging eddy currents induced by crusher gradients using SPEEDI with sub-millisecond temporal resolution
Alessandro M Scotti1, Zheng Zhong2, and Xiaohong Joe Zhou1,3,4,5
1Center for MR Research, University of Illinois at Chicago, Chicago, IL, United States, 2Department of Radiology, Stanford University, Stanford, CA, United States, 3Department of Radiology, University of Illinois at Chicago, Chicago, IL, United States, 4Department of Neurosurgery, University of Illinois at Chicago, Chicago, IL, United States, 5Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, IL, United States
Crusher gradients, typically having very high amplitude, can induce a substantial amount of eddy currents, causing various artifacts. In order to fully characterize the spatiotemporal characteristics of the currents, we have developed a spin echo version of the previously reported SPEEDI technique. The method consists of a series of spin echo acquisitions where each echo point is assigned to a different k-space, reaching a temporal resolution equal to the dwell time. The measured phase difference between sequences with positive and negative crushers revealed B0 and linear eddy currents with time constants equal to the ones measured by the manufacturer’s tool.
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