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Symmetric block-matching registration for the distortion correction of Echo-Planar images
2015
2015 IEEE 12th International Symposium on Biomedical Imaging (ISBI)
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We introduce a new approach to correct geometric and intensity distortion of Echo Planar Images (EPI) from images acquired with opposite phase encoding directions. ...
A new symmetric block-matching registration algorithm has been developed for this purpose relying on new adapted transformations between blocks and a symmetric optimization scheme to ensure an opposite ...
Block-Matching for Distortion Correction In the distortion model, the corrected image C is unknown and can at best be estimated. ...
doi:10.1109/isbi.2015.7163973
dblp:conf/isbi/HedouinCTBSWB15
fatcat:fca45nv6ibdalp5vhetxdeesbi
Block-Matching Distortion Correction of Echo-Planar Images With Opposite Phase Encoding Directions
2017
IEEE Transactions on Medical Imaging
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By shortening the acquisition time of MRI, Echo Planar Imaging (EPI) enables the acquisition of a large number of images in a short time, compatible with clinical constraints as required for diffusion ...
We propose a new block-matching registration method to perform EPI distortion correction based on the acquisition of two EPI with opposite phase encoding directions (PED). ...
The grid phantom was developed by the UNIRS group from the CEA Neurospin for the CATI Consortium for image acquisition and processing. ...
doi:10.1109/tmi.2016.2646920
pmid:28092527
fatcat:337j4dthzvc2re7eeg7vfbc6c4
Evaluation of distortion correction methods in diffusion MRI of the spinal cord
[article]
2021
arXiv
pre-print
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Magnetic field inhomogeneities generate important geometric distortions in reconstructed echo-planar images. ...
The cross-correlation with anatomical image is also improved by Hyperelastic Susceptibility Artefact Correction (HySCO) and block-matching. ...
The pulse sequence used for diffusion MRI was a single-shot Echo-planar imaging (ss-EPI) using parallel imaging (GRAPPA, acceleration factor 2). ...
arXiv:2108.03817v1
fatcat:kzp6aej46fhhxlkiaznrbqctve
COMPENSATION OF GEOMETRIC DISTORTION EFFECTS ON INTRAOPERATIVE MAGNETIC RESONANCE IMAGING FOR ENHANCED VISUALIZATION IN IMAGE-GUIDED NEUROSURGERY
2008
Operative Neurosurgery
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The geometry of intraoperative images (0.5 T) is changed so that the images match the preoperative MRI scans (3 T). ...
application of nonrigid registration to compensate for geometric distortion during neurosurgery, 4) measurement of residual distortion after geometric distortion correction, and 5) phantom study to quantify ...
Acknowledgments We thank GE for the research support. ...
doi:10.1227/01.neu.0000317395.08466.e6
pmid:18424988
fatcat:3ztq5yoobzfy7jjuutkgfwwzza
Modeling and Analysis of Ultrasonic Echoes Reflected from a Surface under Two Layers
[chapter]
2000
Lecture Notes in Computer Science
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In this work, we describe a possible method to compensate or correct for these distortions in ultrasound images. This can be used as a pre-processing step before registration with other modalities. ...
Novel ultrasonic applications such as registration between CT and ultrasound images, requiring comparable levels of accuracies between modalities could suffer from the distortions in ultrasound images. ...
Acknowledgments: We would like to thank Rajesh Gopakumar and Farhana Kagalwala for many helpful discussions and suggestions. ...
doi:10.1007/978-3-540-40899-4_49
fatcat:r5dvhmaghfg3dmrluy6o7a24em
Distortion correction for diffusion-weighted MRI tractography and fMRI in the temporal lobes
2010
Human Brain Mapping
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Single shot echo-planar imaging (EPI) sequences are currently the most commonly used sequences for diffusion-weighted imaging (DWI) and functional magnetic resonance imaging (fMRI) as they allow relatively ...
We describe robust acquisition and processing methods for correcting such distortions in spin echo (SE) EPI using a variant of the reversed direction k space traversal method with a number of novel additions ...
ACKNOWLEDGMENTS We acknowledge the help of Liz Moore of Philips Medical Systems for assistance with sequence development. ...
doi:10.1002/hbm.20959
pmid:20143387
fatcat:ivyr24upnbd7lpfiwswsnczhkq
Quantitative Assessment of the Impact of Geometric Distortions and Their Correction on fMRI Data Analyses
2021
Frontiers in Neuroscience
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Functional magnetic resonance imaging (fMRI) data is typically collected with gradient-echo echo-planar imaging (GE-EPI) sequences, which are particularly prone to the susceptibility artifact as a result ...
TOPUP. fMRI data should thus be corrected for geometric distortions, with the choice of the approach having a modest, albeit positive, impact on the fMRI analyses. ...
AUTHOR CONTRIBUTIONS Both authors coded the stimulus presentation and acquired the data. RA performed the data analyses and wrote the manuscript. JD reviewed the manuscript. ...
doi:10.3389/fnins.2021.642808
pmid:33767610
pmcid:PMC7985341
fatcat:wljdukdtlrekrkxa2uii3wijdy
Distortion Correction of Single-shot EPI Enabled by Deep-learning
2020
NeuroImage
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The PSF-EPI method can obtain distortion-free echo planar images. ...
Through the correction of diffusion-weighted images, the proposed deep-learning based method was demonstrated to have the feasibility to correct for the distortion of EPI images. ...
., 2018) proposed to use the convolutional neural network (CNN) for gradient-echo EPI distortion correction. ...
doi:10.1016/j.neuroimage.2020.117170
pmid:32682096
fatcat:7hp4gdfqrbfr3am3ryvj6wn4ti
3-D Residual Eddy Current Field Characterisation: Applied to Diffusion Weighted Magnetic Resonance Imaging
2013
IEEE Transactions on Medical Imaging
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Characterization of the 3-D eddy current field with linear response theory enables the prediction of the 3-D eddy current field required to correct eddy current induced geometric distortions for a wide ...
The model's performance was tested on diffusion weighted images of four normal volunteers, following distortion correction, the quality of the Stejskal-Tanner diffusion-weighted images was found to have ...
ACKNOWLEDGMENT The authors would like to acknowledge the assistance of Dr. C. Granzeria for assistance with interpretation of the tract based analysis. ...
doi:10.1109/tmi.2013.2259249
pmid:23674437
fatcat:tj3rbiosnrbd5arwjuc4drcnsi
Application of Cortical Unfolding Techniques to Functional MRI of the Human Hippocampal Region
2000
NeuroImage
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We describe a new application of cortical unfolding to high-resolution functional magnetic resonance imaging (fMRI) of the human hippocampal region. ...
The application of these unfolding techniques greatly enhances the ability of fMRI to localize and characterize signal changes within the medial temporal lobe. ...
Special thanks to Oi Lee Wong for her help in segmentation. We also acknowledge Brian Wandell for the use of his segmentation and unfolding software. Finally, we thank J. Mazziotta, M. Cohen, A. ...
doi:10.1006/nimg.2000.0561
pmid:10860795
fatcat:5z2kx55vxraqjfcn3rywl3jclm
Hemifield columns co-opt ocular dominance column structure in human achiasma
2018
NeuroImage
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T 2 -weighted 2D Spin Echo images were acquired at 0.8 mm isotropic resolution. The left eye was occluded. ...
To the right eye, a presentation of flickering checkerboards alternated between the left and right visual fields in a blocked stimulus design. ...
A custommade radio frequency head coil (4-channel transmit, 9-channel receive; Adriany et al., 2012) was used for T 2 -weighted (spin echo) echo-planar imaging (EPI) in the achiasmic participant and ...
doi:10.1016/j.neuroimage.2016.12.063
pmid:28017921
pmcid:PMC5481499
fatcat:rvtwj3k4x5d4vepmyijxffdwqm
Properties of a 2D fat navigator for prospective image domain correction of nodding motion in brain MRI
2014
Magnetic Resonance in Medicine
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Magnetic resonance imaging is one of the fastest developing medical imaging techniques. ...
One of the possible MR imaging contrasts is the ability to visualize diffusion processes. ...
Echo Planar Imaging Echo Planar Imaging (EPI) is a fast image acquisition technique that was invented in 1977 by Sir Peter Mansfield (4) . ...
doi:10.1002/mrm.25234
pmid:24733744
fatcat:edimpyjaafad7bnjtfem4datrm
Scattered slice SHARD reconstruction for motion correction in multi-shell diffusion MRI
[article]
2020
arXiv
pre-print
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Furthermore, the proposed framework integrates slice-level outlier rejection, distortion correction, and slice profile correction. ...
Validation experiments demonstrate accurate slice-level motion correction across the age range and across the range of motion in the population. ...
However, the vast majority of dMRI data are collected as stacks of slices using echo planar imaging (EPI) sequences (Turner et al., 1990) . ...
arXiv:1905.02996v2
fatcat:xtxreyf7gbaarodlfvv5peehuq
Abstracts (Continue in Part XXXIII)
1996
Proceedings of the International Society for Magnetic Resonance in Medicine
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However, it has been observed that the correction of gradient echo EP images is generally not as good as in spin echo images. This results from intra-voxel dephasing in the gradient echo experiments. ...
This has the disadvantage of a greater minimum echo time than for a half Fourier or gradient echo EPI experiment of the same resolution, often leading to excessive T2 contrast. ...
Acknowledgements This project was supported in part by a Special Opportunities Award from the Whitaker Foundation, and by NIH lP41 RRO7723-03. ...
doi:10.1002/mrmp.22419960133
fatcat:qeadomlnojcy7fzo4lmbpjl7oq
Semi-automatic deformable registration of prostate MR images to pathological slices
2010
Journal of Magnetic Resonance Imaging
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For each patient, the T2w imaging containing the largest area of tumor was manually matched with the corresponding pathologic slice. ...
Purpose-To present a semi-automatic deformable registration algorithm for co-registering T2weighted (T2w) images of the prostate with whole-mount pathological sections of prostatectomy specimens. ...
Ada Muellner, BA, for editing this manuscript. Funded by: National Institutes of Health grant #R01 CA76423. ...
doi:10.1002/jmri.22347
pmid:21031521
pmcid:PMC2975408
fatcat:23ijbjglvzhubbejkwgs6hshhu
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