Results 141 to 150 of about 93,892 (190)

Magnetization transfer with echo planar imaging

Magma: Magnetic Resonance Materials in Physics, Biology, and Medicine, 1997
The aim of magnetization transfer is to saturate the protons of the macromolecule pool with a radiofrequency (RF) pulse leading to differences in free water pool signal. Magnetization transfer (MT) contrast is difficult to achieve with the echo planar imaging (EPI) technique, although its short acquisition time would be most beneficial.
J P, Ranjeva, J M, Franconi, C, Manelfe, I, Berry   +3 more
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Line scan echo planar spectroscopic imaging

Magnetic Resonance in Medicine, 2000
A line scan echo planar spectroscopic imaging (LSEPSI) sequence is presented which can rapidly produce 2D chemical shift imaging (CSI) data with minimal relaxation weighting and motion-related artifacts. The technique is based on successive "snapshot" 1D CSI acquisitions of individual tissue columns, and avoids T(1) saturation problems associated with ...
K, Oshio, W, Kyriakos, R V, Mulkern
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Echo-Planar Imaging Pulse Sequences

1998
The advent of faster and stronger gradient systems has enormously boosted the acquisition speed and the scope of applications by magnetic resonance imaging (MRI). The higher gradient strengths and faster switching times available with new gradient amplifiers and coil design has made it possible to: Image with shorter echo times (TEs) to ...
Wielopolski, Piotr, Schmitt, F, Stehling, MK   +2 more
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Volumetric multishot echo‐planar spectroscopic imaging

Magnetic Resonance in Medicine, 2001
AbstractRapid volumetric magnetic resonance spectroscopic imaging (MRSI) is potentially of great relevance to the diagnosis and treatment of focal cerebral diseases such as cancer and epilepsy. A strategy for volumetric multishot echo‐planar spectroscopic imaging (MEPSI) is described which allows whole‐brain metabolite mapping in approximately 20 min ...
J M, Tyszka, A N, Mamelak
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Echo‐planar imaging of diffusion and perfusion

Magnetic Resonance in Medicine, 1991
AbstractUse of the Stejskal‐Tanner sequence for performing diffusion images in the human brain tends to be complicated by the presence of artifacts caused by voluntary or involuntary, sometimes pulsatile, motion. We describe the implementation of the technique of echo‐planar diffusion imaging, which avoids these artifacts and allows reproducible ...
Turner, R., Le Bihan, D., Chesnick, A. S.   +2 more
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Echo-Planar Imaging Image Artifacts

1998
Echo-planar imaging (EPI) is more sensitive to image artifacts than conventional imaging for two basic reasons; these are (a) reversal of every second echo and (b) the long readout (RO) period.
H. Fischer, R. Ladebeck
openaire   +1 more source

1H Detected 13C Echo Planar Imaging

Journal of Magnetic Resonance, 2002
Cyclic J cross polarisation (CYCLCROP) is a sensitive method for the noninvasive monitoring of (13)C distributions and fluxes. The PRAWN rotating frame Hartmann-Hahn mixing sequence ameliorates problems associated with sensitivity to Hartmann-Hahn mismatch and reduces RF power deposition.
Alex M J, Hudson, Walter, Köckenberger, Michael, Heidenreich, Narayanan, Chandrakumar, Rainer, Kimmich, Richard, Bowtell   +5 more
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Echo-Planar Imaging Hardware

1998
The extremely short image acquisition times afforded by the echo-planar imaging (EPI) technique [1] can only be achieved by imposing heavy demands on magnetic resonance (MR) scanner hardware. The high performance required, particularly in the generation of large rapidly switched magnetic field gradients, meant that in the past it was generally not ...
R. Bowtell, F. Schmitt
openaire   +1 more source

Echo-Planar Imaging

2007
The sections in this article are 1 Introduction 2 EPI Technique 3 Barriers to Progress—An Historical Note 4 Spectroscopic Explanation of EPI 5 K-Space Description of EPI 6 Future Prospects 7 Conclusions 8 Biographical Sketch Related ...
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Silent echo-planar imaging for auditory FMRI

Magnetic Resonance Materials in Physics, Biology and Medicine, 2008
The effect of the acoustic scanner noise produced by gradient coil switching on the auditory evoked BOLD signal represents a well-known problem in auditory functional MRI (FMRI). In this paper, a new low-noise echo-planar imaging (EPI) sequence is presented that is optimized for auditory FMRI measurements.The sequence produces a narrow-band acoustic ...
S, Schmitter, E, Diesch, M, Amann, A, Kroll, M, Moayer, L R, Schad   +5 more
openaire   +2 more sources