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Real-time measurement and correction of both B0 changes and subject motion in diffusion tensor imaging using a double volumetric navigated (DvNav) sequence

A. Alhamud, Paul A. Taylor, Andre J.W. van der Kouwe, Ernesta M. Meintjes
2016 NeuroImage  
Keywords diffusion tensor imaging (DTI); zero-order shim (frequency); the first-order shim (linear gradients); navigated diffusion sequence (vNav); double volumetric navigators (DvNav); B0 correction Previous  ...  methods for correcting ΔB0 effects in EPI Several techniques have been proposed to correct ΔB0 effects in EPI, including the use of specific hardware and both prospective and retrospective methods.  ...  Using this double volumetric navigator (DvNav) approach one can correct simultaneously in real time both subject motion and ΔB0.  ... 
doi:10.1016/j.neuroimage.2015.11.022 pmid:26584865 pmcid:PMC4733594 fatcat:mo5da6qzpvgarnnhxelt7rf4eu

Repeatability and reproducibility of prospective motion- and shim corrected 2D glycoCEST MRI

Gizeaddis Lamesgin Simegn, Ali Alhamud, Andre J. W. van der Kouwe, Ernesta Meintjes, Frances Robertson
2019 Quantitative Imaging in Medicine and Surgery  
In nine subjects, double volumetric navigated (DvNav)-CEST acquisitions in the calf muscle were repeated five times in each of two sessions-the first without correction, and the second with real-time shim  ...  In both sessions a dynamically changing field was introduced by running a 5-minute gradient intensive diffusion sequence.  ...  Scanning protocols A 2D gradient echo single-shot echo planar imaging (ss-EPI) continuous wave (CW) CEST sequence with double volumetric navigators (DvNav-CEST) was used for this study.  ... 
doi:10.21037/qims.2019.09.15 pmid:31728311 pmcid:PMC6828578 fatcat:ugeaykmzv5eprkif7wsjpnm34m