Results 151 to 160 of about 93,892 (190)

Reducing flow artifacts in echo‐planar imaging

Magnetic Resonance in Medicine, 1997
AbstractEcho‐planar imaging (EPI) is very susceptible to flow artifacts. Two ways to improve its flow properties are presented. First, “partial flyback” is proposed to reduce artifacts arising from flow in the readout direction. Near the center of k‐space, only the even echoes of the EPI echo‐train are used.
G T, Luk Pat, C H, Meyer, J M, Pauly, D G, Nishimura   +3 more
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Echo-planar imaging of intravoxel incoherent motion.

Radiology, 1990
The recently established single-shot technique of echo-planar imaging of intravoxel incoherent motion (IVIM) for determining and imaging the variations of microscopic motions of water has been applied to studies of water perfusion in phantoms and to in vivo studies of diffusion and perfusion in cat and human brains. The phantom results demonstrate that
Turner, R., Le Bihan, D., Maier, J., Vavrek, R., Hedges, L. K., Pekar, J.   +5 more
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Perfusion Imaging with Echo-Planar Imaging

1998
The introduction of nuclear magnetic resonance (NMR) into medicine [1] initially created hopes that this totally noninvasive imaging modality would be able to differentiate clearly between healthy and pathological tissue on the basis of T1 and T2 signals [2].
M. K. Stehling, R. Brüning, B. R. Rosen
openaire   +1 more source

Spiral Echo-Planar Imaging

1998
This chapter departs somewhat from the others in this volume. Echo-planar imaging (EPI) typically refers to a scan that covers k-space in a nearly rectilinear fashion, with an oscillating gradient on one axis. Here we discuss scanning k-space in a spiral fashion, with two oscillating gradients.
openaire   +1 more source

A keyhole echo planar hybrid imaging technique

Magma: Magnetic Resonance Materials in Physics, Biology, and Medicine, 1999
A hybrid keyhole imaging method is presented which demonstrates the combination of two distinctly different MR imaging techniques. In this work single shot EPI was used as a dynamic update scan for a conventional high resolution gradient echo acquisition.
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Echo Planar Imaging

2022
Val M. Runge, Johannes T. Heverhagen
openaire   +1 more source

Functional Magnetic Resonance Imaging with Echo Planar Imaging

1996
In this report, a review is made of the mechanism behind the functional MRI (fMRI) signals and the advances made in many different areas of fMRI. Such areas include understanding and compensating for artifacts specific to fMRI, postprocessing of fMRI images, the application of fMRI to areas of interest in neuroscience, some interesting new glimpses on ...
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Molecular imaging in oncology: Current impact and future directions

Ca-A Cancer Journal for Clinicians, 2022
Steven P Rowe, Martin G Pomper
exaly  

Diffusion Imaging with Echo-Planar Imaging

1998
By 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 ...
openaire   +1 more source

Theory of Echo-Planar Imaging

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 ...
openaire   +1 more source