Results 241 to 250 of about 197,943 (293)
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Journal of Magnetic Resonance, 1998
The demagnetizing field produced by the nuclear polarization can induce refocusing of multiple spin echoes. We show that multiple spin echoes can be observed in vivo with a clinical MR system at 1.5 T. Strategies for the spatial localization of the multiple spin echo signals are considered.
Bifone A +3 more
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The demagnetizing field produced by the nuclear polarization can induce refocusing of multiple spin echoes. We show that multiple spin echoes can be observed in vivo with a clinical MR system at 1.5 T. Strategies for the spatial localization of the multiple spin echo signals are considered.
Bifone A +3 more
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Physics Today, 1950
An ensemble of nuclear magnetic moments which freely precesses in phase in a large magnetic field at a given Larmor frequency will provide a nuclear induction signal.
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An ensemble of nuclear magnetic moments which freely precesses in phase in a large magnetic field at a given Larmor frequency will provide a nuclear induction signal.
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Echo‐planar spin‐echo and inversion pulses
Magnetic Resonance in Medicine, 1993AbstractThe echo‐planar k‐space trajectory can be used as the basis for any two‐dimensional selective pulse. The main application is spectral‐spatial pulses, which must be based on the echoplanar trajectory. In this paper we show how echo‐planar spinecho (EPSE) pulses may be designed.
J, Pauly, D, Spielman, A, Macovski
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Neutron resonance spin echo using spin echo correction coils
Chemical Physics, 2003Abstract We report on a recent experiment which was performed in order to examine a new experimental realization of the neutron resonance spin echo (NRSE) technique. In neutron spin echo (NSE) neutrons accumulate spin phase in long magnetic fields before and after the sample.
Wolfgang Häussler +3 more
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Fast spin echo vs conventional spin echo in cervical spine imaging
European Radiology, 1997The major attraction of fast-spin-echo (FSE) imaging is reduced acquisition time; however, careful review of the literature reveals many weaknesses: phase-encoded blurring, truncation artefact, bright fat signal, reduced magnetic susceptibility and increased motion artefact.
A R, Gillams, J A, Soto, A P, Carter
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Applied Magnetic Resonance, 2004
Single-quantum proton spin coherences produced by a single radio-frequency pulse and evolving in a spatially modulated, external magnetic field were examined theoretically and experimentally in water. It is shown that the coherences are multiply refocused in the form of “grating echoes”. The theoretical treatment describes and explains the phenomena in
I. Ardelean, B. Buhai, R. Kimmich
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Single-quantum proton spin coherences produced by a single radio-frequency pulse and evolving in a spatially modulated, external magnetic field were examined theoretically and experimentally in water. It is shown that the coherences are multiply refocused in the form of “grating echoes”. The theoretical treatment describes and explains the phenomena in
I. Ardelean, B. Buhai, R. Kimmich
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Coupled‐spin fast spin‐echo MR imaging
Journal of Magnetic Resonance Imaging, 1993AbstractDistinguishing between lipid and water‐containing tissues is clinically important. Current techniques rely on the chemical shift difference between fat and water resonances or differences in relaxation times of the tissues, or a combination of both. A method is presented for separating the signals of lipid protons from those of water protons by
R T, Constable, R C, Smith, J C, Gore
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Gradient Echo Versus Spin Echo
2010Spin echo and gradient echo pulse sequences follow similar contrast behaviour but there are some key differences. The spin echo pulse sequence uses an excitation pulse that is normally 90°, and a 180° refocusing pulse that reverses the effect of field inhomogeneities.
Sven Plein +2 more
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1998
Abstract One of the most versatile tools available to the NMR spectroscopist is the spin echo experiment.1 Not only does it pervade the fields of solid- and liquid-state NMR, ESR, and magnetic resonance imaging, but it has acted as a catalyst for the invention of a host of new physical techniques introduced over the last four decades ...
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Abstract One of the most versatile tools available to the NMR spectroscopist is the spin echo experiment.1 Not only does it pervade the fields of solid- and liquid-state NMR, ESR, and magnetic resonance imaging, but it has acted as a catalyst for the invention of a host of new physical techniques introduced over the last four decades ...
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Journal of Experimental and Theoretical Physics Letters, 1996
A muon spin echo method is proposed for determining the contributions of the static and dynamic local fields in muon experiments. It is shown that if for each muon which has stopped in the sample a rf pulse of fixed duration is applied to the sample at a time τ after the muon entered the sample, then after a sufficient number of muon-positron decays ...
S. A. Moiseev, N. M. Suleimanov
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A muon spin echo method is proposed for determining the contributions of the static and dynamic local fields in muon experiments. It is shown that if for each muon which has stopped in the sample a rf pulse of fixed duration is applied to the sample at a time τ after the muon entered the sample, then after a sufficient number of muon-positron decays ...
S. A. Moiseev, N. M. Suleimanov
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