Abstract #4372

Concomitant Gradient Field Corrections for Asymmetric Diffusion Encoding Waveforms

Matthew J. Middione¹, Michael Loecher¹, Kévin Moulin^1,2, and Daniel B. Ennis^1,2,3

¹Department of Radiology, Stanford University, Palo Alto, CA, United States, ²Cardiovascular Institute, Stanford University, Palo Alto, CA, United States, ³Veterans Administration Health Care System, Division of Radiology, Palo Alto, CA, United States

In DWI, applied diffusion gradients are assumed to be linear in space, but in practice are accompanied by additional undesired concomitant gradient (CG) fields that arise as a consequence of Maxwell’s equations. These CG fields contribute a residual gradient moment for asymmetric diffusion encoding strategies, which may impact the quantitative accuracy of the measured ADC. In this work, a CG correction method that does not increase the minimum achievable TE was implemented for clinically relevant asymmetric diffusion encoding DWI protocols and the mean ADC error reduction was characterized.

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