New approach for correcting distortions in echo planar imaging
نویسندگان
چکیده
منابع مشابه
Correcting dynamic distortions in 7T echo planar imaging using a jittered echo time sequence
PURPOSE To develop a distortion correction method for echo planar imaging (EPI) that is able to measure dynamic changes in B0 . THEORY AND METHODS The approach we propose is based on single-echo EPI with a jittering of the echo time between two values for alternate time points. Field maps are calculated between phase images from adjacent volumes and are used to remove distortion from correspo...
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Diffusion tensor imaging is often performed by acquiring a series of diffusion-weighted spin-echo echo-planar images with different direction diffusion gradients. A problem of echo-planar images is the geometrical distortions that obtain near junctions between tissues of differing magnetic susceptibility. This results in distorted diffusion-tensor maps. To resolve this we suggest acquiring two ...
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A novel and effective technique is described for distortion correction in echo planar imaging (EPI) utilizing the field maps derived from multi-echo gradient-echo images. The distortions from different off-resonance related factors such as field inhomogeneity, eddy current effect, radiofrequency pulse frequency offset, and chemical shift effect can be simultaneously reduced to a great extent. W...
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Echo-planar imaging is a fast magnetic resonance (MR) imaging technique that allows acquisition of single images in as little as 20 msec and performance of multiple-image studies in as little as 20 seconds. Echo-planar imaging achieves its speed by obtaining all spatial-encoding information after a single radio-frequency (RF) excitation. Conventional imaging requires multiple-RF excitations, se...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2004
ISSN: 0740-3194,1522-2594
DOI: 10.1002/mrm.20297