Results 191 to 200 of about 10,176 (239)

T2 relaxometry of brain in myotonic dystrophy

Neuroradiology, 2001
We 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, Di Salle F, Santoro L, Bonavita V, Tedeschi G.   +4 more
openaire   +7 more sources

NMR Relaxometry: The Canonical Case Glycerol

The Journal of Physical Chemistry B, 2020
We present a quantitative description of the proton spin-lattice relaxation rate R1(T,ω) of glycerol including temperatures from 191 to 360 K and a frequency range 10 kHz < ω/2π < 20 MHz covered by the field-cycling technique. The analysis encompasses the data compiled by Noack and co-workers in 1971, so far, the most complete data set (10 kHz > ω/2π <
M. Flämig, M. Hofmann, N. Fatkullin, E. A. Rössler   +3 more
openaire   +2 more sources

A relaxometry method that emphasizes practicality and availability

Magnetic Resonance in Medicine, 2022
PurposeAlthough many methods have been proposed to quantitatively map the main MRI parameters (e.g., T1, T2, C × M0), these methods often involve special sequences not readily available on clinical scanners and/or may require long scan times. In contrast, the proposed method can readily run on most scanners, offer flexible tradeoffs between scan time ...
Bruno Madore, Michael Jerosch‐Herold, Jr‐Yuan George Chiou, Cheng‐Chieh Cheng, Jeffrey P. Guenette, Georgeta Mihai   +5 more
openaire   +2 more sources

Relaxometry of Tissue

2007
The sections in this article are 1 Introduction 2 Proton 1/T1 NMRD Profiles of Tissue and Model Systems 3 Proton and Deuteron NMRD Profiles in Model Systems with Deuterated Solvent 4 Theory 5 Data and Theory 6 Cytoplasmic Ordering and Cytoplasmic Chaos 7 Perspectives 8 Biographical Sketches Related ...
Seymour H. Koenig, Rodney D. Brown
openaire   +1 more source

Magnetic resonance relaxometry in Parkinson's disease

Neurological Sciences, 2002
A 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, P, Filippi, U, Magliola, S, Duca   +3 more
openaire   +2 more sources

Relaxometry and Contrast Agents

2018
The perturbation on the relaxation of solvent water protons induced by the presence of paramagnetic metal-containing systems has been exploited for the design of contrast agents in magnetic resonance imaging applications. Complexes of Gd3+ ions were identified early as the candidates of choice and several, highly stable, Gd-containing contrast agents ...
Silvio Aime, Eliana Gianolio, Alessandra Viale   +2 more
openaire   +1 more source

Ferrohydrodynamic relaxometry for magnetic particle imaging

Applied Physics Letters, 2011
The ferrohydrodynamic properties of magnetic nanoparticles govern resolution and signal strength in magnetic particle imaging (MPI), a medical imaging modality with applications in small animals and humans. Here, we discuss the development and key results of a magnetic particle relaxometer that measures the core diameter and relaxation constant of ...
P. W. Goodwill, A. Tamrazian, L. R. Croft, C. D. Lu, E. M. Johnson, R. Pidaparthi, R. M. Ferguson, A. P. Khandhar, Kannan M. Krishnan, S. M. Conolly   +9 more
openaire   +1 more source

T2* relaxometry mapping of the uterine zones

Acta Radiologica, 2012
Background Previous literature demonstrated that the T2* value of the uterine junctional zone was lower than that of peripheral myometrium by using BOLD MR imaging. We expect T2* mapping image may add more information to T2-weighted images of the uterine myometrium.
Izumi, Imaoka, Takayuki, Nakatsuka, Tetsuro, Araki, Takashi, Katsube, Masahiro, Okada, Seishi, Kumano, Kazunari, Ishii, Ryuichiro, Ashikaga, Tomoyuki, Okuaki, Marc, Van Cauteren, Takamichi, Murakami   +10 more
openaire   +2 more sources

An MRI phantom material for quantitative relaxometry

Magnetic Resonance in Medicine, 1987
AbstractMost phantom media in current use exhibit T1 relaxation times that are significantly dependent on both temperature and operating frequency. This can introduce undesirable variability into relaxation measurements due to temperature fluctuations, and complicates direct comparison of imagers operating at different magnetic field strengths.
K A, Kraft, P P, Fatouros, G D, Clarke, P R, Kishore   +3 more
openaire   +2 more sources

T2 relaxometry of ring lesions of the brain

Clinical Radiology, 2007
To differentiate two common aetiologies of "ring lesions," tuberculomas and cysticercal cysts, using T2 relaxometry.Fifty-five ring-enhancing lesions of the brain (32 cysticercal cysts; 23 tuberculomas) in 27 patients with focal seizures were studied for T2 relaxation times.The mean T2 relaxation times of cysticercal cysts was 617 ms (range 305-1365 ms;
P N, Jayakumar, S G, Srikanth, H S, Chandrashekar, D K, Subbakrishna   +3 more
openaire   +2 more sources