Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Sep 2007
A new EPI-based dynamic field mapping method: application to retrospective geometrical distortion corrections.
To retrospectively correct for geometrical distortions, a new dynamic field mapping method suitable for dynamic single-shot gradient-echo type echo-planar imaging (GRE-EPI) is proposed. ⋯ Given the minor increase in the acquisition time, this method is well suited for functional magnetic resonance imaging; prospective direction.
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J Magn Reson Imaging · Sep 2007
Cepstral estimation of arterial input functions in brain perfusion imaging.
To investigate voxel-specific arterial input functions (AIFs) obtained through blind deconvolution using complex cepstrum liftering. Blindly estimated AIFs have the potential of reducing dispersion effects in perfusion maps and are completely user-independent. ⋯ The overlap of AIFs and TRFs in the complex cepstrum makes reliable separation of the two functions more difficult than previously described. Comparison to noncepstral blind methods suggests that similar optima are found using the new separation filter.
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J Magn Reson Imaging · Sep 2007
Three dimensional myoarchitecture of the human tongue determined in vivo by diffusion tensor imaging with tractography.
To study the anatomical relationships involving the intrinsic and extrinsic myofiber populations of the human tongue employing diffusion tensor imaging (DTI) with tractography. ⋯ The current results display for the first time the use of DTI tractography in vivo to visualize the complete structural anatomy of the human tongue and allow us to consider fundamental structure-function relationships.