Results 281 to 290 of about 137,292 (318)

A retraced spiral strategy with semi‐automatic deblurring for volumetric thermometry

open access: yesMagnetic Resonance in Medicine, EarlyView.
Abstract Purpose To develop a 3D MRI‐thermometry technique for transcranial MR‐guided focused ultrasound (MRgFUS). Methods A stack of retraced in‐out (RIO) spirals was incorporated into a 3D, RF‐spoiled, gradient recalled echo (GRE) sequence with a minimized energy deblurring strategy. Bloch simulations examined isochromat precession during RIO readout
Steven P. Allen   +4 more
wiley   +1 more source

B0 navigator enables respiratory motion navigation in radial stack‐of‐stars liver Look‐Locker T1 mapping

open access: yesMagnetic Resonance in Medicine, EarlyView.
Abstract Purpose To develop a B0$$ {B}_0 $$ self‐navigation approach to estimate respiratory motion for motion‐corrected liver T1$$ {T}_1 $$ mapping using a Look‐Locker acquisition with radial stack‐of‐stars trajectory. Methods The proposed method derives 1D field‐map profiles from the oversampled k‐space center to estimate a normalized breathing curve
Jonathan Stelter   +5 more
wiley   +1 more source

Block‐interleaved segmented echo‐planar imaging for improved activity detection in submillimeter high‐resolution functional MRI at 7 T

open access: yesMagnetic Resonance in Medicine, EarlyView.
Abstract Purpose Isotropic submillimeter high‐resolution functional MRI (fMRI) facilitates noninvasive investigation of neuronal activities at the mesoscale level, including cortical columns and laminae. However, the task‐evoked functional activity becomes less detectable when using single‐shot echo planar imaging (EPI) with parallel imaging techniques
Guoxiang Liu   +2 more
wiley   +1 more source

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