Efficient correction of inhomogeneous static magnetic field-induced distortion in Echo Planar Imaging
نویسندگان
چکیده
منابع مشابه
Susceptibility‐induced distortion correction in hyperpolarized echo planar imaging
PURPOSE Echo planar imaging is an attractive rapid imaging readout that can image hyperpolarized compounds in vivo. By alternating the sign of the phase encoding gradient waveform, spatial offsets arising from uncertain frequency shifts can be determined. We show here that blip-reversed echo planar imaging can also be used to correct for susceptibility and B0 inhomogeneity effects that would ot...
متن کاملCorrection of concomitant magnetic field-induced image artifacts in nonaxial echo-planar imaging.
Echo-planar images acquired in nonaxial planes are often distorted. Such image distortion has limited the applications of the echo-planar imaging (EPI) technique. In this article, it is demonstrated that a considerable amount of the distortion is caused by the higher-order magnetic field concomitant with the linear magnetic field gradient, or the concomitant magnetic field. The image distortion...
متن کاملOptimized distortion correction technique for echo planar imaging.
A new phase-shifted EPI pulse sequence is described that encodes EPI phase errors due to all off-resonance factors, including B(o) field inhomogeneity, eddy current effects, and gradient waveform imperfections. Combined with the previously proposed multichannel modulation postprocessing algorithm (Chen and Wyrwicz, MRM 1999;41:1206-1213), the encoded phase error information can be used to effec...
متن کاملMonitoring, analysis, and correction of magnetic field fluctuations in echo planar imaging time series.
PURPOSE To assess the utility of concurrent magnetic field monitoring for observing and correcting for variations in k-space trajectories and global background fields that occur in single-shot echo planar imaging (EPI) time series as typically used in functional MRI (fMRI). METHODS Field monitoring was performed using an array of NMR field probes operated concurrently with series of single-sh...
متن کاملGeometric distortion correction in echo volumar imaging
Introduction: Echo volumar imaging (EVI) is a 3D extension of echo-planar imaging (EPI) that allows data from an entire volume to be acquired following a single excitation. However, only a few studies to date have applied EVI to functional MRI (fMRI) due to its high sensitivity to field-inhomogeneity induced distortions. In this study, we extend two EPI distortion correction techniques to EVI: ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: NeuroImage
سال: 2010
ISSN: 1053-8119
DOI: 10.1016/j.neuroimage.2009.11.044