Results 261 to 270 of about 231,179 (296)
Ultra-high field imaging in Major Depressive Disorder: a review of structural and functional studies
Journal of Affective Disorders, 2021 Background: Major depressive disorder (MDD) is a severe and pervasive psychiatric condition with a lifetime prevalence of 15–25%. Numerous Magnetic Resonance Imaging (MRI) studies employing scans at field strengths of 1.5T or 3T have been carried out in ...
Giulia Cattarinussi +2 more
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Ultra-High-Field Superconductivity
Physical Review Letters, 1962In a rare earth ferromagnetic metal the effective exchange field (H/sub eff/) impressed on the conduction electrons is in general so large as to inhibit the occurrence of superconductivity in zero external field H. A discussion is presented to point out that in certain ferromagnetic metals H/sub eff/ opposes H and allows conduction electron ...
V. Jaccarino, M. Peter
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Macroscopic Susceptibility in Ultra High Field MRI
Journal of Computer Assisted Tomography, 1999Magnetic susceptibility provides the basis for functional studies and image artifacts in MRI. In this work, magnetic susceptibility and the associated artifacts were analyzed at 8 T in phantoms and in the human head.A mineral oil phantom was constructed in which three cylindrical air-filled tubes were inserted.
A M, Abduljalil, P M, Robitaille
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Perspectives of Ultra-High-Field MRI in Neuroradiology
Clinical Neuroradiology, 2015Magnetic resonance imaging (MRI) is one of the most important methods for the diagnosis and therapy monitoring of various diseases. Today, magnets up to 3 T are standard. This review will give an overview of the clinical perspectives of ultra-high field MRI, meaning mainly 7 T.Literature review with focus on clinical applications of 7 T imaging in ...
Gizewski, Elke Ruth +2 more
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Biological and clinical MRS at ultra-high field
NMR in Biomedicine, 1997The advantages of performing spectroscopic studies at higher field strengths include increased SNR, improved spectral resolution for J-coupled resonances, and improvements in the selectivity of spectral editing schemes. By using pulse sequences that minimize the required echo time, refocus J-evolution, employ low peak B1 requiring pulses and take ...
H P, Hetherington +4 more
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Ultra-high field imaging of the amygdala – A narrative review
Neuroscience & Biobehavioral Reviews, 2023The amygdala is an evolutionarily conserved core structure in emotion processing and one of the key regions of interest in affective neuroscience. Results of neuroimaging studies focusing on the amygdala are, however, often heterogeneous since it is composed of functionally and neuroanatomically distinct subnuclei. Fortunately, ultra-high-field imaging
Cedric Fabian Kirstein +2 more
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Epilepsy under the scope of ultra-high field MRI
Epilepsy & Behavior, 2021Ultra-high field magnetic resonance imaging (UHF-MRI) is capable of unraveling anatomical structures in a submillimeter range. In addition, its high resonance regime allows the quantification of constitutive molecules in a spatially sensitive manner, a crucial capability for determining the extent and localization of a probable epileptogenic region or ...
Carlo, Rondinoni +4 more
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Dielectric Resonance Phenomena in Ultra High Field MRI
Journal of Computer Assisted Tomography, 1999Dielectric resonances have previously been advanced as a significant cause of image degradation at higher fields. In this work, a study of dielectric resonances in ultra high field MRI is presented to explore the real importance of dielectric resonances in the human brain in this setting.Gradient-recalled echo images were acquired using a transverse ...
A, Kangarlu +6 more
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Applications of ultra-high field lasers
Spectrochimica Acta Part B: Atomic Spectroscopy, 2003Abstract This article describes the development of lasers of extremely high intensity using the technique of chirped pulse amplification. A number of applications of high-intensity laser–matter interactions are described. These include proton beam generation and tomography, astrophysics, laser-induced nuclear physics, the generation and measurement ...
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Threats to ultra-high-field MRI
Physics World, 2009In 2004 the European Commission (EC) adopted a directive restricting occupational exposure to electromagnetic fields. This directive (2004/40/CE), which examines the possible health risks of the electromagnetic fields from mobile phones, Wi-Fi, Bluetooth and other devices, concluded that upper limits on radiation and applied electromagnetic fields are ...
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