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Abstract #0562

Integration of Higher-Order Dynamic Fields Into MR Image Reconstruction

Bertram Jakob Wilm1, Christoph Barmet1, Matteo Pavan1, Peter Boesiger1, Klaas Paul Pruessmann1

1Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland

Recent improvements in magnetic field monitoring opened up the possibility of capturing higher-order dynamic field evolution, providing the necessary information to correct for the image distortions they cause. In the present work a technique for higher order field reconstruction is introduced and demonstrated for diffusion weighted EPI. It has been found that eddy currents of diffusion gradients can induce considerable higher-order field perturbations, causing residual error in conventional first-order reconstruction. Higher-order reconstruction largely eliminated these errors in phantom and in-vivo experiments.