Eddy current compensated double diffusion encoded ( DDE ) MRI
نویسندگان
چکیده
منابع مشابه
Artifacts Caused by Eddy Current in Diffusion MRI
Magnetic resonance diffusion imaging is potentially an important tool for the noninvasive characterization of normal and pathological tissue. The technique, however, is prone to a number of artifacts that can severely affect its ability to provide clinically useful information. In this study, the problem of eddy current-induced geometric distortions that occur in diffusion images was addressed,...
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Introduction: High-performance RF coils and shielded Gradient coils [1] for high or ultra high field MRI often require the use of RF shields that are in close proximity to the imaged volume. These shields can sometimes generate Eddy-Currents that are not adequately compensated for using the pre-emphasis algorithm [2] of the scanner. K-space trajectory measurements [3] can be used to compensate ...
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Introduction Eddy currents (EC) are known to distort diffusion-weighted (DW) images. The image distortions increase in magnitude with increased diffusion sensitisation (b–value) while the signal to noise (SNR) decreases simultaneously. This is challenging for post processing correction methods that compare DW image volumes with a non-DW image volume. Such methods have been confirmed to work wel...
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Image distortion due to field gradient eddy currents can create image artifacts in diffusion-weighted MR images. These images, acquired by measuring the attenuation of NMR signal due to directionally dependent diffusion, have recently been shown to be useful in the diagnosis and assessment of acute stroke and in mapping of tissue structure. This work presents an improvement on the spin-echo (SE...
متن کاملDouble-spin-echo diffusion weighting with a modified eddy current adjustment.
Magnetic field inhomogeneities like eddy current-related gradient fields cause geometric distortions in echo-planar imaging (EPI). This in particular affects diffusion-weighted imaging where these distortions vary with the direction of the diffusion weighting and hamper the accurate determination of diffusion parameters. The double-spin-echo preparation often used aims to reduce the cumulative ...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2015
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.26092