Results 11 to 20 of about 2,171 (219)

Feasibility and reproducibility of echo planar spectroscopic imaging on the quantification of hepatic fat. [PDF]

PLoS ONE, 2014
1H-MRS is widely regarded as the most accurate noninvasive method to quantify hepatic fat content (HFC). When practical period of breath holding, and acquisition of HFC over multiple liver areas is considered, a fast MR spectroscopic imaging technique is
Yi-Ru Lin, Jian-Jia Chiu, Shang-Yueh Tsai   +2 more
doaj   +8 more sources

High-resolution echo-planar spectroscopic imaging of the human calf. [PDF]

PLoS ONE, 2014
BACKGROUND: This study exploits the speed benefits of echo-planar spectroscopic imaging (EPSI) to acquire lipid spectra of skeletal muscle. The main purpose was to develop a high-resolution EPSI technique for clinical MR scanner, to visualise the bulk ...
Jan Weis, Morten Bruvold, Francisco Ortiz-Nieto, Håkan Ahlström   +3 more
doaj   +6 more sources

Multi-Echo-Based Echo-Planar Spectroscopic Imaging Using a 3T MRI Scanner [PDF]

Materials, 2011
The use of spin-echoes has been employed in an Echo-Planar Spectroscopic Imaging (EPSI) sequence to collect multiple phase encoded lines within a single TR in a Multi-Echo-based Echo-Planar Spectroscopic Imaging technique (MEEPSI). Despite the T2 dependence on the amplitude of the spin-echoes, the Full Width at Half Maximum (FWHM) of the derived multi ...
M Albert Thomas, Thomas M Albert
exaly   +7 more sources

Assessment of spectral ghost artifacts in echo-planar spectroscopic micro-imaging with flyback readout [PDF]

Scientific Reports
In this work, echo-planar spectroscopic imaging (EPSI) with flyback readout gradient-echo train was implemented in a preclinical MR scanner. The aim of this study is to visualize and quantify the ghost spectral lines produced by two, three and four ...
Jan Weis, Magor Babos, Sergio Estrada, Ram Kumar Selvaraju   +3 more
doaj   +5 more sources

Metabolite-cycled echo-planar spectroscopic imaging of the human heart. [PDF]

Magn Reson Med, 2022
PurposeSpectroscopic imaging could provide insights into regional cardiac triglyceride variations, but is hampered by relatively long scan times. It is proposed to synergistically combine echo‐planar spectroscopic imaging (EPSI) with motion‐adapted gating, weighted acquisition and metabolite cycling to reduce scan times to less than 10 min while ...
Peereboom SM, Kozerke S.
europepmc   +4 more sources

Correction and optimization of symmetric echo-planar spectroscopic imaging for hyperpolarized [1-¹³C]-pyruvate. [PDF]

J Magn Reson, 2020
Symmetric echo-planar spectroscopic imaging (EPSI) supports higher spectral bandwidth and improves signal-to-noise efficiency compared to flyback EPSI with the same readout bandwidth, but suffers from artifacts that are associated with non-uniform temporal sampling in k-t space.
Xu Z, Niedzielski JS, Sun C, Walker CM, Michel KA, Einstein SA, Martinez GV, Bankson JA.   +7 more
europepmc   +4 more sources

Ghost peaks simulation and reduction in high-resolution echo-planar spectroscopic imaging with flyback readout [PDF]

Scientific Reports
The undesirable aspect of echo-planar spectroscopic imaging (EPSI) is the occurrence of Nyquist ghost spectral lines. This phenomenon reduces the intensity of each true spectral line due to energy transfer into one or more ghost peaks.
Jan Weis, Magor Babos, Ram Kumar Selvaraju   +2 more
doaj   +2 more sources

Whole-brain analysis of amyotrophic lateral sclerosis by using echo-planar spectroscopic imaging. [PDF]

Radiology, 2013
To detect regional metabolic differences in amyotrophic lateral sclerosis (ALS) with whole-brain echo-planar spectroscopic imaging.Sixteen patients with ALS (nine men, seven women; mean age, 56.6 years), five persons suspected of having ALS (four men, one woman; mean age, 62.6 years), and 10 healthy control subjects (five men, five women; mean age, 56 ...
Verma G, Woo JH, Chawla S, Wang S, Sheriff S, Elman LB, McCluskey LF, Grossman M, Melhem ER, Maudsley AA, Poptani H.   +10 more
europepmc   +4 more sources

Gamma-aminobutyric acid edited echo-planar spectroscopic imaging (EPSI) with MEGA-sLASER at 7T. [PDF]

Magn Reson Med, 2019
PurposeFor rapid spatial mapping of gamma‐aminobutyric acid (GABA) at the increased sensitivity and spectral separation for ultra‐high magnetic field strength (7 tesla [T]), an accelerated edited magnetic resonance spectroscopic imaging technique was developed and optimized for the human brain at 7 T.MethodsA MEGA‐sLASER sequence was used for GABA ...
Magnusson PO, Boer VO, Marsman A, Paulson OB, Hanson LG, Petersen ET.   +5 more
europepmc   +7 more sources

Association of Intracellular Microstructural and Neuropsychological Changes in HIV: A Pilot Validation of Trace Diffusion-Weighted Magnetic Resonance Spectroscopic Imaging Using Radial Trajectories [PDF]

Metabolites
Background: Despite effective antiretroviral therapy, HIV-associated neurocognitive disorders (HANDs) remain prevalent, highlighting the need for sensitive biomarkers of early brain alterations. Trace-weighted diffusion spectroscopic imaging offers a non-
Ajin Joy, Andres Saucedo, Matthew J. Wright, Pranathi Vallabhu, Neha Gupta, James Sayre, Aichi Chien, Uzay Emir, Paul M. Macey, Eric S. Daar, M. Albert Thomas   +10 more
doaj   +2 more sources