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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