Abstract #1560

Effects of concomitant gradients on Quantitative Susceptibility Mapping

Timothy J Colgan^1,2, Diego Hernando¹, Samir Sharma¹, Debra E Horng^1,2, and Scott B Reeder^1,2,3,4,5

¹Radiology, University of Wisconsin, Madison, WI, United States, ²Medical Physics, University of Wisconsin, Madison, WI, United States, ³Biomedical Engineering, University of Wisconsin, Madison, WI, United States, ⁴Medicine, University of Wisconsin, Madison, WI, United States, ⁵Emergency Medicine, University of Wisconsin, Madison, WI, United States

MR-based Quantitative Susceptibility Mapping (QSM) techniques have multiple potential applications in brain and body imaging. QSM techniques generally rely on the removal of background field effects to obtain a local B0 map, followed by dipole inversion to estimate the underlying susceptibility distribution. However, concomitant gradients introduce significant unanticipated phase shifts in the acquired data that manifest as errors in the measured B0 field map. Our results demonstrate that CG phase corrections and/or the use of a background field removal algorithm that removes this background field component are necessary for accurate QSM.

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