Results 71 to 80 of about 11,693 (198)

Quantitative Assessment of Visible Nigrosome‐1 in Patients with Parkinson's Disease

Movement Disorders Clinical Practice, EarlyView.
Abstract Background The nigrosome‐1 (N1) sign on susceptibility‐weighted imaging (SWI) typically disappears in Parkinson's disease (PD), though some patients can show uni−/bilaterally preserved N1. Objective Investigating whether visible nigrosomes in PD patients differ from those of healthy subjects (HC). Methods Forty‐eight PD and 35 HC underwent 3 T‐
Maria Eugenia Caligiuri, Ilaria Chimento, Marida De Maria, Emma Biondetti, Jolanda Buonocore, Valerio Riccardo Aquila, Maria Celeste Bonacci, Emanuele Tinelli, Umberto Sabatini, Aldo Quattrone, Andrea Quattrone   +10 more
wiley   +1 more source

Affine transformation edited and refined deep neural network for quantitative susceptibility mapping

NeuroImage, 2023
Deep neural networks have demonstrated great potential in solving dipole inversion for Quantitative Susceptibility Mapping (QSM). However, the performances of most existing deep learning methods drastically degrade with mismatched sequence parameters ...
Zhuang Xiong, Yang Gao, Feng Liu, Hongfu Sun   +3 more
doaj   +1 more source

Nonlinear Dynamical Equation for Irreversible, Steepest-Entropy-Ascent Relaxation to Stable Equilibrium

, 2007
We discuss the structure and main features of the nonlinear evolution equation proposed by this author as the fundamental dynamical law within the framework of Quantum Thermodynamics.
Andrei Yu. Khrennikov, Gian Paolo Beretta, Guillaume Adenier, Pekka Lahti, Theo M. Nieuwenhuizen, Vladimir I. Man'ko   +5 more
core   +1 more source

In Vivo Mapping of Catecholaminergic Loss and Iron Deposition in Huntington's Disease

Movement Disorders, EarlyView.
Abstract Background The pathophysiology of Huntington's disease (HD) remains obscure. Magnetic resonance imaging (MRI) can reveal in vivo molecular changes related to disease pathology. Objectives To investigate catecholaminergic neuronal integrity and subcortical brain iron accumulation in HD employing neuromelanin‐sensitive MRI, and quantitative ...
Edoardo R. de Natale, Heather Wilson, Efstratios Karavasilis, Athanasia Liozidou, Chrisoula Kartanou, Georgios Velonakis, Jens Kuhle, Ioannis Zalonis, Georgia Karadima, Leonidas Stefanis, Georgios Koutsis, Marios Politis   +11 more
wiley   +1 more source

Ultrashort Echo Time Quantitative Susceptibility Mapping (UTE-QSM) of Highly Concentrated Magnetic Nanoparticles: A Comparison Study about Different Sampling Strategies

Molecules, 2019
The ability to accurately and non-invasively quantify highly concentrated magnetic nanoparticles (MNPs) is desirable for many emerging applications. Ultrashort echo time quantitative susceptibility mapping (UTE-QSM) has demonstrated the capability to ...
Xing Lu, Hyungseok Jang, Yajun Ma, Saeed Jerban, Eric Y. Chang, Jiang Du   +5 more
doaj   +1 more source

Lindblad dynamics of the quantum spherical model

, 2017
The purely relaxational non-equilibrium dynamics of the quantum spherical model as described through a Lindblad equation is analysed. It is shown that the phenomenological requirements of reproducing the exact quantum equilibrium state as stationary ...
Henkel, Malte, Landi, Gabriel T., Wald, Sascha   +2 more
core   +1 more source

Sieving random iterative function systems

, 2020
It is known that backward iterations of independent copies of a contractive random Lipschitz function converge almost surely under mild assumptions. By a sieving (or thinning) procedure based on adding to the functions time and space components, it is ...
Marynych, Alexander, Molchanov, Ilya
core   +1 more source

Temperature Dependence of Paramagnetic Species in the Human Brain Tissue: An X‐Band EPR Study

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Paramagnetic ions are distributed throughout the human brain. The increased accumulation of these metals, such as iron and copper, can induce cellular death and the development of neurological diseases. Electron Paramagnetic Resonance (EPR) is a spectroscopic technique capable of detecting these ions in a given biological sample ...
André Avanzine, José Henrique Monteiro de Azevedo, Martina Huber, Fábio Seiji Otsuka, Maria Concepción García Otaduy, Roberta Diehl Rodriguez, Carlos Ernesto Garrido Salmon   +6 more
wiley   +1 more source

Magnetic Properties of Ferritin at Different Levels of Degradation: Implications for MRI‐Based Iron Quantification in the Brain

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Ferritin's iron core exhibits complex magnetic properties, as suggested by magnetometry and Mössbauer spectroscopy, which remain incompletely understood. In particular, the antiferromagnetic inner core could influence the accuracy of iron quantification using MRI and raise concerns about postmortem validation studies involving degraded
Stefan Ropele, Sowmya Sunkara, Snježana Radulović, Saška Lipovšek, Michael Stöger‐Pollach, Christoph Birkl, Walter Gössler, Christian Enzinger, Gerd Leitinger   +8 more
wiley   +1 more source

Motion‐ and Field‐Robust Mesoscopic Whole‐Brain T2*$$ {T}_2^{\ast } $$‐Weighted Imaging at 7 and 11.7 T Using Servo Navigation

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To mitigate artifacts related to motion and field changes in high‐resolution T2*$$ {T}_2^{\ast } $$‐weighted human brain imaging using servo navigation at ultra‐high fields up to 11.7 T. Methods MR‐based servo navigators were integrated into a segmented 3D‐EPI sequence to allow for prospective correction of involuntary head motion and ...
Matthias Serger, Rüdiger Stirnberg, Philipp Ehses, Malte Riedel, Thomas Ulrich, Caroline Le Ster, Franck Mauconduit, Vincent Gras, Alexis Amadon, Alexandre Vignaud, Son Chu, Shajan Gunamony, Maxim Zaitsev, Nicolas Boulant, Klaas P. Pruessmann, Tony Stoecker   +15 more
wiley   +1 more source