Results 211 to 220 of about 54,563 (252)
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Echo-Planar Imaging of the Abdomen
1998Magnetic resonance imaging (MRI) of the abdomen has been of limited clinical value because of long examination times, motion artifacts, and lack of suitable contrast agents [1–7]. Echo-planar MRI (EPI) and its derivatives have been developed to provide ultrafast imaging capability thus eliminating motion-related volume-averaging and phase-encoding ...
P. Reimer, R. Ladebeck
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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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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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Line scan echo planar spectroscopic imaging
Magnetic Resonance in Medicine, 2000A 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 of the Heart
1998The initial exploratory studies into the potential use of echo-planar imaging (EPI) to study the heart were carried out by the pioneers of the technique, Mansfield and his group at the University of Nottingham. As early as 1982 Ordidge and colleagues [63] first demonstrated the potential of the method by “freezing” the motion of the heart while imaging
D. N. Firmin, B. P. Poncelet
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Volumetric multishot echo‐planar spectroscopic imaging
Magnetic Resonance in Medicine, 2001AbstractRapid 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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The clinical applications of echo planar imaging in Neuroradiology
Neuroradiology, 1990Ultra high speed echo-planar imaging gives an imaging time typically of the order of a few minutes, facilitating throughput, improving patient tolerance and allowing real time dynamic studies. A complete two dimensional image may be acquired in a single shot lasting between 64 and 128 ms.
B S, Worthington, P, Mansfield
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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
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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
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Analysis of flow effects in echo‐planar imaging
Journal of Magnetic Resonance Imaging, 1992AbstractThe effects on the phase of spins moving during echo‐planar imaging (EPI) acquisition were studied. Standard single‐shot and interleaved multishot blipped EPI acquisitions were considered, assuming either high gradient strength and slew rates or standard gradient strength and slew rates. A spiral k‐space trajectory was also considered.
K, Butts, S J, Riederer
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Diffusion Imaging with Echo-Planar Imaging
1998By diffusion we mean the random, thermally activated motion of particles from site to site, often given the name of Brownian motion, after its first observer. This may be self-diffusion, as in the case of a pure liquid in which we may conceptually label one of the molecules and follow its motion over the course of time, or diffusion of one type of ...
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1998
Magnetic resonance (MR) imaging always involves a complex balance of final signal-to-noise ratio (SNR) against a host of user-specified parameters such as resolution, contrast, scan time, and field of view. The total available nuclear MR signal in biological tissues is extremely small, a problem aggravated by the typical needs of the researcher or ...
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Magnetic resonance (MR) imaging always involves a complex balance of final signal-to-noise ratio (SNR) against a host of user-specified parameters such as resolution, contrast, scan time, and field of view. The total available nuclear MR signal in biological tissues is extremely small, a problem aggravated by the typical needs of the researcher or ...
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