Results 231 to 240 of about 20,208 (255)
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Spatially resolved multidimensional cross-correlation relaxometry
Magnetic Resonance Imaging, 2010Novel protocols are presented for acquiring one- and two-dimensional relaxation time spectra from selected subvolumes of a macroscopically heterogeneous sample. Although the protocols are generally applicable, special emphasis is given to their implementation on low-cost, low-field bench-top relaxometers lacking pulse shaping or pulsed gradient ...
Luca, Venturi, Brian, Hills
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Magnetic resonance relaxometry in Parkinson's disease
Neurological Sciences, 2002A central role of iron in the pathogenesis of idiopathic Parkinson's disease (PD), due to its increase in substantia nigra pars compacta dopaminergic neurons and its capacity to enhance production of toxin reactive oxygen radicals, has been discussed for many years.
F, Mondino +3 more
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T2 relaxometry of brain in myotonic dystrophy
Neuroradiology, 2001We investigated the nature and extent of brain involvement in myotonic dystrophy (DM), examining possible T2 relaxation abnormalities in the brain of 20 patients with adult-onset DM and 20 sex- and age-matched normal controls. Brain MRI was performed at 0.5 T, and T2 values were calculated from signal intensity in two echoes.
DI COSTANZO, Alfonso +4 more
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Proton Relaxometry of Long‐Lived Spin Order
ChemPhysChem, 2019AbstractA study of long‐lived spin order in chlorothiophene carboxylates at both high and low magnetic fields is presented. Careful sample preparation (removal of dissolved oxygen in solution, chelating of paramagnetic impurities, reduction of convection) allows one to obtain very long‐lived singlet order of the two coupled protons in chlorothiophene ...
Alexey S. Kiryutin +4 more
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T2 Relaxometry of Human Median Nerve
Seminars in Musculoskeletal Radiology, 2009This article examines the T2 relaxation characteristics of the median nerve. Knowledge of the T2 relaxation time is essential to optimize clinical magnetic resonance imaging (MRI) protocols and to enhance the visibility of pathophysiological changes in tissues. The T2 relaxation time of the median nerve is short relative to the T2 of other tissues like
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2019
Relaxation times and diffusion coefficients can be measured in inhomogeneous magnetic fields by analyzing signal decay and build-up in the time domain Inhomogeneous fields are inexpensive to generate with permanent magnets The fields of permanent magnets are low (up to 2 T) compared to those of most superconducting NMR magnets (up to 24 T)
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Relaxation times and diffusion coefficients can be measured in inhomogeneous magnetic fields by analyzing signal decay and build-up in the time domain Inhomogeneous fields are inexpensive to generate with permanent magnets The fields of permanent magnets are low (up to 2 T) compared to those of most superconducting NMR magnets (up to 24 T)
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1997
The main objective of field-cycling experiments [231, 367] is to obtain information on the spectral density of the fluctuating spin interactions in a frequency range as wide as possible.1 Typical examples are discussed in Chaps. 14 and 16 (see Figs. 12.1 and 14.2, for instance).
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The main objective of field-cycling experiments [231, 367] is to obtain information on the spectral density of the fluctuating spin interactions in a frequency range as wide as possible.1 Typical examples are discussed in Chaps. 14 and 16 (see Figs. 12.1 and 14.2, for instance).
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Relaxometry: Two-Dimensional Methods
2009The publication in 2002 of a fast algorithm for inverse double Laplace transforms opened the door to two-dimensional low-field relaxometry characterized by 2D “relaxation spectra” in which standard nuclear magnetic resonance (NMR) parameters such as T1, T2, and the diffusion coefficient, D, are cross-correlated.
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