Results 131 to 140 of about 93,892 (190)

Radial Echo-Planar Imaging

Journal of Magnetic Resonance, 1998
A new ultrafast magnetic resonance imaging pulse sequence named radial echo-planar imaging (rEPI) is introduced. The sequence is based on a modification of the echo-planar imaging (EPI) sequence to scan k-space radially, in an attempt to combine the speed of EPI with the benefits of radial sampling.
A C, Silva, E L, Barbier, I J, Lowe, A P, Koretsky   +3 more
openaire   +2 more sources

Echo-Planar Image Reconstruction

1998
Echo-planar imaging (EPI), introduced by Mansfield in 1977 [1], permits the measurement of an entire magnetic resonance (MR) image in less than 100 ms. After a single excitation an appropriate gradient sequence encodes the magnetization repeatedly, thus filling the whole k-space.
Schmitt, F, Wielopolski, Piotr
openaire   +2 more sources

Echo-Planar Imaging Angiography

1998
Speed continues to be one of the most powerful features that echo-planar imaging (EPI) can offer relative to other magnetic resonance imaging (MRI) techniques. For most conventional MRI sequences, data acquisition is still slower than many dynamic physiological processes, often yielding images plagued with motion artifacts that can obscure important ...
Wielopolski, Piotr, Simonetti, OP, Duerk, JC   +2 more
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Echo‐Planar Diffusion Spectroscopic Imaging

Magnetic Resonance in Medicine, 1995
AbstractHigh‐speed diffusion spectroscopic imaging based on an echo‐planar technique is presented. A pair of diffusion gradients is applied prior to a rapidly oscillating magnetic field gradient which encodes both chemical shift and spatial information.
Y, Bito, S, Hirata, T, Nabeshima, E, Yamamoto   +3 more
openaire   +2 more sources

Interleaved asymmetric echo‐planar imaging

Magnetic Resonance in Medicine, 1995
AbstractA version of interleaved echo‐planar imaging (EPI) is presented in which only one polarity of the readout gradient is used for signal acquisition to avoid ghosting artifacts. Two possible forms of the phase encoding gradient, blipped and constant, are discussed.
F, Hennel, J F, Nédélec
openaire   +2 more sources

Echo-planar rotating-frame imaging

Journal of Magnetic Resonance, 2003
A new rotating-frame imaging method that produces a complete cross section of an object in a single experiment is reported. The echo planar rotating frame imaging (EPROFI) technique uses two perpendicular RF gradients for two-dimensional spatial encoding and fully exploits the formation of rotary echoes for fast sampling of spatial frequencies.
F, Casanova, H, Robert, J, Perlo, D, Pusiol   +3 more
openaire   +2 more sources

Accelerated silent echo-planar imaging

Magnetic Resonance Imaging, 2019
The standard approach to Echo-Planar Imaging (EPI) is to use trapezoidal readout (RO) gradients with blipped phase-encoding (PE) gradients. Sinusoidal RO gradients with constant PE gradients can reduce acoustic noise. However, this sequence, originally introduced by Mansfield et al., constitutes major challenges for Cartesian parallel imaging ...
Patrick, Liebig, Robin M, Heidemann, Bernhard, Hensel, David A, Porter   +3 more
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Echo planar imaging of perfluorocarbons

Magnetic Resonance Imaging, 1993
Emulsions of perfluorotributylamine (FTBA) and perflubron were evaluated for their utility in 19F echo planar imaging. Fluorine images of the emulsions were obtained in a phantom and two mice that had been predosed. Both agents, but particularly perflubron, show potential for fluorine echo planar studies because of the long spin-spin relaxation times ...
B R, Barker, R P, Mason, R M, Peshock
openaire   +2 more sources

Echo planar spectroscopic imaging

Concepts in Magnetic Resonance, 2001
AbstractEcho planar spectroscopic imaging (EPSI) allows for mapping one spatial dimension and the spectroscopic dimension in a single readout. Modern clinical magnetic resonance imaging scanners are becoming widely equipped with echo planar imaging gradient capabilities.
Robert V. Mulkern, Lawrence P. Panych
openaire   +1 more source

Echo-planar pediatric imager.

Radiology, 1988
Practical constraints make it difficult to build large-aperture echo-planar magnetic resonance (MR) imagers. The implementation of a pediatric imager and its performance are described. Spatial resolution and signal-to-noise levels comparable to those of 1982 state-of-the-art MR imagers have been achieved in imaging times of 0.05-0.15 seconds. T1 and T2
L E, Crooks, M, Arakawa, N M, Hylton, H, Avram, J C, Hoenninger, J C, Watts, J D, Hale, L, Kaufman   +7 more
openaire   +2 more sources