Meeting Banner
Abstract #2576

Characterization and Correction of Eddy-Current Artifacts in Unipolar and Bipolar Diffusion Sequences Using a Field-Monitoring Approach: Application to Renal Diffusion Tensor Imaging (DTI)

Rachel Wai-chung Chan1, Sebastian Kozerke2, 3, Daniel Giese3, Jack Harmer3, Christian T. Stoeck2, Constantin von Deuster2, 3, Andrew Peter Aitken3, David Atkinson1

1Centre for Medical Imaging, University College London, London, United Kingdom; 2Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland; 3Division of Imaging Sciences, King's College London, London, United Kingdom

In diffusion tensor imaging (DTI), time-varying eddy-currents over long readout durations cause images from different directions to be misregistered. Using a field camera with 16 NMR probes, higher-order spatial phase offsets from eddy-currents were measured and used for correction of misregistration artifacts in renal DTI. The unipolar Stejskal-Tanner and velocity-compensated bipolar sequences were compared. Phantom experiments reveal that higher-order correction is beneficial for the unipolar sequence. In an in vivo experiment where both kidneys in a healthy volunteer were simultaneously imaged, the fractional anisotropy (FA) maps showed improved image quality with eddy-current correction.

Keywords

additional aligned alignment anisotropic anisotropy application array arrows artifacts background beam benefit best better biomedical bipolar blue breath bulk camera channels characterization characterizing chem college compensated conjugate consisting correct corrected correction cortex depending deviations differ diffusion diffusivity direct displayed distortions division dominated durations dynamic eddy edges embedded engineering experiment field fractional gating gelatin gradient gradients green harmer healthy held help ignored improved improvements in vivo indicated induced insensitivity institute jack kidney kidneys king kingdom lead linear locations long made maps matrix measured measuring medical medulla minimized misalignment misalignments monitoring motion nature navigator near object offer offsets particularly parts pencil phantom phys pipeline pixels plastic played preceding press probe probes processing pulses pyramids quality readout reconstructed reconstruction renal replacing respiratory sciences series several severe simultaneously slice spatial strong structures subsequently supported surrounding system tanner technologies tensor throughout translations unipolar valuable various vary varying velocity verified visible volunteer window worse