Results 201 to 210 of about 54,563 (252)

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
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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
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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
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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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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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Echo Planar Imaging of the Abdomen

Topics in Magnetic Resonance Imaging, 1995
Echo planar imaging (EPI) is an ultrafast magnetic resonance (MR) imaging method first proposed more than 15 years ago. With EPI, all the information necessary to create an image is obtained very rapidly (typically on the order of 50-150 ms). Special hardware modifications are needed, particularly in the magnetic field gradients and data acquisition ...
Markus F. M??ller, Robert R. Edelman
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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

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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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
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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
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