Results 1 to 10 of about 62,400 (175)

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
exaly   +6 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
exaly   +6 more sources

The effect of residual Nyquist ghost in quantitative echo-planar diffusion imaging [PDF]

Magnetic Resonance in Medicine, 1999
Single-shot diffusion-weighted echo-planar imaging (EPI) is typically used for most clinical diffusion studies due to its low sensitivity to patient motion. Although the Nyquist ghost artifact in EPI can be substantially reduced, there is frequently a residual ghost with low signal intensity.
David A. Porter, Fernando Calamante, Alan Connelly   +2 more
exaly   +3 more sources

Sensitivity and resolution enhancement in the SERF experiment using perfect echo and by elimination of axial peaks and ghost couplings

Journal of Magnetic Resonance Open, 2022
Due to its inherent insensitivity amongst the spectroscopic techniques, improvements in sensitivity and resolution are always demanding in NMR spectroscopy.
Sandeep Kumar Mishra, Suryaprakash Nagarajarao   +1 more
exaly   +3 more sources

Reduction of spectral ghost artifacts in high-resolution echo-planar spectroscopic imaging of water and fat resonances [PDF]

Magnetic Resonance in Medicine, 2003
AbstractEcho‐planar spectroscopic imaging (EPSI) can be used for fast spectroscopic imaging of water and fat resonances at high resolution to improve structural and functional imaging. Because of the use of oscillating gradients during the free induction decay (FID), spectra obtained with EPSI are often degraded by Nyquist ghost artifacts arising from ...
Gregory S Karczmar
exaly   +3 more sources

A robust self-referenced 2D nyquist ghost correction for different MRI-biomarker measurements based on multi-band interleaved EPI

Frontiers in Physics, 2023
Purpose: To enable 2D Nyquist ghost correction for multi-band interleaved echo-planar imaging (EPI) without reference scan.Methods: 2D phase errors between positive and negative echo were directly measured from the multi-band interleaved EPI data ...
Xiaoxi Liu, Xiaoxi Liu, Shihui Chen, Di Cui, Edward S. Hui, Edward S. Hui, Edward S. Hui, Queenie Chan, Nan-Kuei Chen, Nan-Kuei Chen, Hing-Chiu Chang, Hing-Chiu Chang   +11 more
doaj   +1 more source

Enhancement of ice-phase precipitation caused by thermal forcing produces ghost echoes over the Tibetan Plateau

npj Climate and Atmospheric Science, 2021
Whether tall storms produce heavy precipitation is currently a controversial topic. Here, we used seven years of observations from the dual-frequency precipitation radar and found that there is a rare but unique vertical precipitation structure over the ...
Yilun Chen, Aoqi Zhang, Shumin Chen, Chaoyong Tu, Weibiao Li, Yunfei Fu   +5 more
doaj   +1 more source

Estimation of High-Frequency Vibration Parameters for Airborne Terahertz SAR Using Chirplet Decomposition and LS Sequential Estimators

Remote Sensing, 2022
Due to the short wavelength of the terahertz wave, airborne terahertz synthetic aperture radar (THz-SAR) suffers from echo phase errors caused by the high-frequency vibration of the platform.
Zhaoxin Hao, Jinping Sun, Qing Li, Tao Shan   +3 more
doaj   +1 more source

Pharmacokinetic Analysis of Gd-DTPA Enhancement in dynamic three-dimensional MRI of breast lesions [PDF]

, 1997
The purpose of this study was to demonstrate that dynamic MRI covering both breasts can provide sensitivity for tumor detection as well as specificity and sensitivity for differentiation of tumor malignancy.
de Vos, Rob A.I., den Boer, Jacques A., Dornseiffen, Gerard, Hoenderop, Ruud K.K.M., Koch, Paul W.A.A., Mulder, Jan H., Mulder, Jan H., Slump, Cornelis H., Smink, Jouke, Smink, Jouke, Volker, Edo D.P.   +10 more
core   +10 more sources

Fugitive Aesthetics [PDF]

Third Text, 2022
This article discusses four recently released refugee films: Dolce Fine Giornata, Atlantics, Island of the Hungry Ghosts, and Life Overtakes Me. It draws on a range of theoretical frames, including the work of Avery Gordon and Jacques Derrida on spectrality, in order to outline the original concept of ‘fugitive aesthetics’, the narrative and stylistic ...
Bruce Bennett, Katarzyna Marciniak
openaire   +1 more source