Results 191 to 200 of about 2,171 (219)

In Vivo31P Echo-Planar Spectroscopic Imaging of Human Calf Muscle

Journal of Magnetic Resonance, 2001
Localized phosphorus-31 NMR spectra of human calf muscle in vivo were obtained by means of echo-planar spectroscopic imaging (EPSI) with a 1.5-T whole-body scanner. The technique permits the measurement of two-dimensional 31P SI data at a minimum acquisition time of 2.4 s (8x8 voxels, TR=300 ms).
T, Wilhelm, P, Bachert
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High‐resolution echo‐planar spectroscopic imaging at ultra‐high field

NMR in Biomedicine, 2018
MR spectroscopic imaging (MRSI) at ultra‐high field (≥7 T) benefits from improved sensitivity that allows the detection of low‐concentration metabolites in the brain. However, optimized acquisition techniques are required to overcome inherent limitations of MRSI at ultra‐high field.
Eduardo Coello, Ralph Noeske, Brian L. Burns, Jeremy W. Gordon, Angela Jakary, Bjoern Menze, Axel Haase, Peder E.Z. Larson, Yan Li, Rolf F. Schulte   +9 more
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Spectroscopic imaging using concentrically circular echo‐planar trajectories in vivo

Magnetic Resonance in Medicine, 2011
AbstractAn alternative to the standard echo‐planar spectroscopic imaging technique is presented, spectroscopic imaging using concentrically circular echo‐planar trajectories (SI‐CONCEPT). In contrast to the conventional chemical shift imaging data, the sampled data from each set of concentric rings were regridded into Cartesian space.
Jon K, Furuyama, Neil E, Wilson, M Albert, Thomas   +2 more
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Overdiscrete echo‐planar spectroscopic imaging with correlated higher‐order phase correction

Magnetic Resonance in Medicine, 2019
PurposeTo introduce a robust methodology for fast 1H MRSI of the brain at 3T with improved SNR and reduced phase‐related artifacts.MethodAn accelerated acquisition scheme using echo‐planar spectroscopic imaging (EPSI) was combined with the overdiscrete reconstruction framework. This approach enables the interleaved acquisition of a water reference scan
Eduardo Coello, Fatih S. Hafalir, Ralph Noeske, Marion Menzel, Axel Haase, Bjoern Menze, Rolf F. Schulte   +6 more
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Comparison of Sagittal and Transverse Echo Planar Spectroscopic Imaging on the Quantification of Brain Metabolites

Journal of Neuroimaging, 2014
ABSTRACTPURPOSEWe quantitatively compared sagittal and transverse echo planar spectroscopic imaging (EPSI) on the quantification of metabolite concentrations with consideration of tissue variation. A quantification strategy is proposed to collect the necessary information for quantification of concentrations in a minimized acquisition time.METHODSSix ...
Yeh, Chia-Jung, Tseng, Yu-Sheng, Lin, Yi-Ru, Tsai, Shang-Yueh, Huang, Teng-Yi   +4 more
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[Data reconstruction algorithm on echo-planar magnetic resonance spectroscopic imaging].

Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi, 2009
When a conventional phase-encoding magnetic resonance spectrascopic imaging(MRSI) method is in use, the data acquisition is very time consuming and thus it is not well accepted in clinical settings. Echo planar spectroscopic imaging (EPSI) technology has been applied for rapid acquisition of MRSI data.
Min, Huang, Songtao, Lu, Jiarui, Lin
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Phosphorus magnetic resonance spectroscopic imaging using flyback echo planar readout trajectories

Magnetic Resonance Materials in Physics, Biology and Medicine, 2018
To present and evaluate a fast phosphorus magnetic resonance spectroscopic imaging (MRSI) sequence using echo planar spectroscopic imaging with flyback readout gradient trajectories.Waveforms were designed and implemented using a 3 Tesla MRI system. 31P spectra were acquired with 2 × 2 cm2 and 3 × 3 cm2 resolution over a 20- and 21-cm field of view and
Alejandro Santos-Díaz, Sergei I. Obruchkov, Rolf F. Schulte, Michael D. Noseworthy   +3 more
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High‐speed 3T MR spectroscopic imaging of prostate with flyback echo‐planar encoding

Journal of Magnetic Resonance Imaging, 2007
AbstractProstate MR spectroscopic imaging (MRSI) at 3T may provide two‐fold higher spatial resolution over 1.5T, but this can result in longer acquisition times to cover the entire gland using conventional phase‐encoding. In this study, flyback echo‐planar readout trajectories were incorporated into a Malcolm Levitt's composite‐pulse decoupling ...
Albert P, Chen, Charles H, Cunningham, Esin, Ozturk-Isik, Duan, Xu, Ralph E, Hurd, Douglas A C, Kelley, John M, Pauly, John, Kurhanewicz, Sarah J, Nelson, Daniel B, Vigneron   +9 more
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Dynamic ³¹P spectroscopic imaging of skeletal muscles combining flyback echo‐planar spectroscopic imaging and compressed sensing

Magnetic Resonance in Medicine, 2019
PurposeDynamic phosphorus MR spectroscopic imaging (31P‐MRSI) experiments require temporal resolution on the order of seconds to concurrently assess different muscle groups. A highly accelerated pulse sequence combining flyback echo‐planar spectroscopic imaging (EPSI) and compressed sensing was developed and tested in a phantom and healthy humans ...
Alejandro Santos‐Díaz, Diana Harasym, Michael D. Noseworthy   +2 more
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Anatomical and functional brain imaging using high‐resolution echo‐planar spectroscopic imaging at 1.5 Tesla

NMR in Biomedicine, 2005
AbstractHigh‐resolution echo‐planar spectroscopic imaging (EPSI) of water resonance (i.e. without water suppression) is proposed for anatomic and functional imaging of the human brain at 1.5 T. Water spectra with a resolution of 2.6 Hz and a bandwidth of 333 Hz were obtained in small voxels (1.7 × 1.7 × 3 mm3) across a single slice.
Weiliang, Du, Gregory S, Karczmar, Stephen J, Uftring, Yiping P, Du   +3 more
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