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Natural linewidth chemical shift imaging (NL-CSI)
2006
Magnetic Resonance in Medicine
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However, the existence of magnetic field inhomogeneities creates an additional source of intervoxel signal leakage. ...
The approach is based on acquired CSI data, high-resolution images, and magnetic field maps. ...
While these coils can partially correct for relatively coarse, low-spatial-frequency field inhomogeneities, they cannot completely eliminate magnetic field inhomogeneities at the interfaces of air, tissue ...
doi:10.1002/mrm.20917
pmid:16721752
pmcid:PMC2235821
fatcat:yjruau5gjvhmtjqboahpev2ixe
Denoising MR Spectroscopic Imaging Data With Low-Rank Approximations
2013
IEEE Transactions on Biomedical Engineering
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This paper addresses the denoising problem associated with magnetic resonance spectroscopic imaging (MRSI), where signal-to-noise ratio (SNR) has been a critical problem. ...
A new scheme is proposed, which exploits two low-rank structures that exist in MRSI data, one due to partial-separability and the other due to linear predictability. ...
CONCLUSIONS This paper has presented a new method (LORA) for spatialspectral filtering of MR spectroscopic imaging data. ...
doi:10.1109/tbme.2012.2223466
pmid:23070291
pmcid:PMC3800688
fatcat:xefbapswfva7xlspib3e3ote2i
Imaging based magnetic resonance spectroscopy (MRS) localization for quantitative neurochemical analysis and cerebral metabolism studies
2017
Analytical Biochemistry
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, including incorporation of magnetic field inhomogeneity corrections, the use of multiple receiver coils, and prospective optimization of data acquisition. ...
In vivo magnetic resonance spectroscopy (MRS) techniques allow non-invasive measurements of neurochemicals in either single voxel or multiple voxels, yet the spatial resolution and detection sensitivity ...
The Hoglund Brain Imaging Center is partly supported by grants from the NIH (1S10 RR029577) and the Hoglund Family Foundation. ...
doi:10.1016/j.ab.2017.01.007
pmid:28082217
pmcid:PMC5469694
fatcat:w4bjdslun5ewviqfwzlazcuf3i
Comprehensive Literature Review of Hyperpolarized Carbon-13 MRI: The Road to Clinical Application
2021
Metabolites
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The road to clinical application is discussed regarding clinical needs and technological advancements, highlighting the most recent successes of metabolic imaging with hyperpolarized carbon-13 MRI. ...
Given the current state of hyperpolarized carbon-13 MRI, the conclusion of this review is that the workflow for hyperpolarized carbon-13 MRI is the limiting factor. ...
Data Acquisition B0 field map: Magnetic field inhomogeneity leads to a spread in resonance frequencies, causing difficulties preserving the spectral separation. ...
doi:10.3390/metabo11040219
pmid:33916803
fatcat:qwy64p2cwjah5mml3w7qg4lu54
Evidence of Axonal Damage in the Early Stages of Multiple Sclerosis and Its Relevance to Disability
2001
Archives of Neurology
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Design: We performed proton magnetic resonance spectroscopic imaging in 88 patients with a wide range of clinical disability and disease duration to measure Nacetylaspartate (NAA, an index of axonal integrity ...
) relative to creatine (Cr) in a large central brain volume that included mostly normal-appearing white matter on magnetic resonance imaging. ...
Artifacts present in the time domain water-suppressed signal due to static magnetic field inhomogeneities and time-varying gradients were corrected by dividing the water-suppressed MRSI signal by the non-water-suppressed ...
doi:10.1001/archneur.58.1.65
pmid:11176938
fatcat:lo6nvvc6ijgrjk77ddrss7zek4
Accelerated MR spectroscopic imaging—a review of current and emerging techniques
2020
NMR in Biomedicine
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Over more than 30 years in vivo MR spectroscopic imaging (MRSI) has undergone an enormous evolution from theoretical concepts in the early 1980s to the robust imaging technique that it is today. ...
In this process, MRSI techniques had to constantly adapt, but have also benefitted from the significant increase of magnetic field strength boosting the signal-to-noise ratio along with high gradient fidelity ...
Moser, Lukas Hingerl and Gilbert Hangel for their support with the preparation of Figures 1, 4, 6 , and 8 as well as Zhi-Pei Liang and Fan Lam for providing Figure 15 .
ORCID ...
doi:10.1002/nbm.4314
pmid:32399974
pmcid:PMC8244067
fatcat:kx2yyrjp7vbhvks5j723s5prre
Achieving High-Resolution 1H-MRSI of the Human Brain with Compressed-Sensing and Low-Rank Reconstruction at 7 Tesla
2021
Journal of magnetic resonance (San Diego, Calif. 1997 : Print)
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Low sensitivity MR techniques such as magnetic resonance spectroscopic imaging (MRSI) greatly benefit from the gain in signal-to-noise provided by ultra-high field MR. ...
High-resolution and whole-slab brain MRSI remains however very challenging due to lengthy acquisition, low signal, lipid contamination and field inhomogeneity. ...
.: IZSEZ0_188859, and the National Institutes of Health through National Cancer Institute grant 1R01CA211080. ...
doi:10.1016/j.jmr.2021.107048
pmid:34438355
pmcid:PMC8717865
fatcat:pfidjvdn4rcklaqnsgcgz2gfea
Evaluation of heterogeneous metabolic profile in an orthotopic human glioblastoma xenograft model using compressed sensing hyperpolarized 3D13C magnetic resonance spectroscopic imaging
2012
Magnetic Resonance in Medicine
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Compressed sensing 3D 13 C magnetic resonance spectroscopic imaging data were acquired from a phantom and 10 tumor-bearing rats following injection of hyperpolarized [1-13 C]-pyruvate using a 3T scanner ...
polarization in liquid state have allowed for the acquisition of 13 C magnetic resonance spectroscopic imaging (MRSI) data with a substantial gain in sensitivity over conventional MR methods (1). ...
Acknowledgments The authors gratefully acknowledge the assistance of Dr. ...
doi:10.1002/mrm.24434
pmid:22851374
pmcid:PMC3630274
fatcat:oqqdkb76g5a3biambsyq472k7u
Achieving High-Resolution Whole-Brain Slab 1H-MRSI with Compressed-Sensing and Low-Rank Reconstruction at 7 Tesla
[article]
2020
bioRxiv
pre-print
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Low sensitivity MR techniques such as magnetic resonance spectroscopic imaging (MRSI) greatly benefit from the gain in signal-to-noise (SNR) provided by ultra-high field MR. ...
High-resolution and whole-brain slab MRSI remains however very challenging due to lengthy acquisition, low signal, lipid contamination and field inhomogeneity. ...
This research was supported by the Swiss National Science Foundation grant number: IZSEZ0 188859, and the National Institutes of Health through National Cancer Institute grant 1R01CA211080. ...
doi:10.1101/2020.05.13.092668
fatcat:wi755wcl7zglzau2sxky2ec5nq
Data-Driven MRSI Spectral Localization Via Low-Rank Component Analysis
2013
IEEE Transactions on Medical Imaging
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Magnetic resonance spectroscopic imaging (MRSI) is a powerful tool capable of providing spatially localized maps of metabolite concentrations. ...
As additional a priori information, our approach relies only upon a measured field inhomogeneity map at high spatial resolution. ...
The authors would also like to thank the anonymous reviewers, whose insightful comments significantly improved the quality of the manuscript. ...
doi:10.1109/tmi.2013.2266259
pmid:23744674
fatcat:uhzipyxbg5elpgx6nclhor3zca
PATHOLOGICAL BRAIN DETECTION BY ARTIFICIAL INTELLIGENCE IN MAGNETIC RESONANCE IMAGING SCANNING (INVITED REVIEW)
2016
Electromagnetic Waves
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Next, we introduced important MRI techniques, such as the shimming, water and fat suppression, and three advanced imaging modalities (functional MRI, diffusion tensor imaging, and magnetic resonance spectroscopic ...
This review offers a comprehensive and quantitative comparison for PBD systems by artificial intelligence in magnetic resonance imaging (MRI) scanning. ...
Shimming Shimming is to correct the inhomogeneity of magnetic field produced by the main magnet [51] . ...
doi:10.2528/pier16070801
fatcat:li642csvdfhwvhgpdvats34g4i
Algebraic Decomposition of Fat and Water in MRI
2009
IEEE Transactions on Medical Imaging
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The decomposition of MRI data to generate water and fat images has several applications in medical imaging, including fat suppression and quantification of visceral fat. ...
On most of the pixels with multiple feasible solutions, the correct solution can be identified by a simple sorting of the solutions. ...
ACKNOWLEDGMENT This work was supported by the Beckman Foundation and the startup funds at the University of Rochester. The authors would like to thank Prof. ...
doi:10.1109/tmi.2008.927344
pmid:19188106
fatcat:yg2awad3dzckjotkypevhq5524
Localized Single-Voxel Spin-Echo Proton MR Spectroscopy of Normal Hippocampal Area at 1.5 T : Optimal Voxel Volume and Reproducibility of Metabolite Ratios
1997
Journal of the Korean Radiological Society
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PU rpose : To determine the optimal voxel volume covering the hippocampal area in single-voxel proton magnetic resonance (MR) spectroscopy and to evaluate the reprod uci bili ty of metabolite ratios of ...
Results : The SNR of NAA peaks increased significantly as voxel volume was increased to 3 ml (p < 0.01 , Kruskal-Wallis test and Wilcoxon rank sum test). ...
During the last decade, morphological changes is this small structute have been thoroughly evaluated by qualitative and quantitative magnetic resonance imaging (MR1) techniques (2 -5) , and MR imaging ...
doi:10.3348/jkrs.1997.37.5.775
fatcat:y5owhpr37nf3xizghjzsnhhf6a
Research Applications of Magnetic Resonance Spectroscopy to Investigate Psychiatric Disorders
2008
Topics in Magnetic Resonance Imaging (TMRI)
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Advances in magnetic resonance spectroscopy (MRS) methodology and related analytic strategies allow sophisticated testing of neurobiological models of disease pathology in psychiatric disorders. ...
An overview of principles underlying MRS, methodological considerations, and investigative approaches is presented. ...
in field inhomogeneity. 30, 31 This latter approach additionally necessitates correction for partial volume effects. ...
doi:10.1097/rmr.0b013e318181e0be
pmid:19363431
pmcid:PMC2669689
fatcat:26bdusddgffkhd2dzu6vfnihtu
Phased-array combination for MR spectroscopic imaging using a water reference
2015
Magnetic Resonance in Medicine
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Purpose-To evaluate methods for multichannel combination of 3D MR Spectroscopic Imaging (MRSI) data with a focus on using information from a water-reference spectroscopic image. ...
Results were compared using the signal to noise ratio (SNR) of the N-Acetylaspartate (NAA) resonance. ...
In the SVD based methods, the combined signal is determined through the rank reduction of the data, which truncates a large portion of the data. ...
doi:10.1002/mrm.25992
pmid:26413752
pmcid:PMC4809804
fatcat:lazphvl6gfghdlgdv7f2aindpy
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