Results 81 to 90 of about 6,791 (211)

Quantitative susceptibility and T1ρ mapping of knee articular cartilage at 3T

Osteoarthritis and Cartilage Open
T1ρ and Quantitative Susceptibility Mapping (QSM) are evolving as substrates for quantifying the progressive nature of knee osteoarthritis. Objective: To evaluate the effects of spin lock time combinations on depth-dependent T1ρ estimation, in adjunct to
Allen A. Champagne, Taylor M. Zuleger, Daniel R. Smith, Alexis B. Slutsky-Ganesh, Shayla M. Warren, Mario E. Ramirez, Lexie M. Sengkhammee, Sagar Mandava, Hongjiang Wei, Davide D. Bardana, Joseph D. Lamplot, Gregory D. Myer, Jed A. Diekfuss   +12 more
doaj   +1 more source

QQ‐Based Oxygen Extraction Fraction (OEF) Mapping in Mouse Brain: Initial Experience

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Oxygen extraction fraction (OEF) is a vital biomarker of cerebral oxygen metabolism and tissue viability. A novel OEF mapping method, QQ, which combines quantitative susceptibility mapping (QSM) and quantitative blood oxygen level‐dependent (qBOLD) (QSM + qBOLD = QQ), has demonstrated promise in detecting disease‐related OEF ...
Quinn Boyer, Dongkyu Lee, Tian Qiu, HyungJoon Cho, Junghun Cho   +4 more
wiley   +1 more source

Comparison of QSM, plain GRE, SWI and QSM-WI at 7.0 T ex vivo.

, 2015
Comparison of QSM post-processed, plain GRE, SWI and QSM-WI datasets from a 1-month-old human specimen scanned at 7.0 T (TE = 29.06 ms and bandwidth = 60 Hz/pixel) in 3 mm-thick mIPs with QSM contrast inverted to match SWI and GRE.
Ferenc Tóth (665272), Mikko J. Nissi (769123), Cathy S. Carlson (277390), Luning Wang (769124), Jutta M. Ellermann (769125)   +4 more
core   +1 more source

A pilot study assessing the clinical utility of deep learning-reconstructed 3D-echo-planar-imaging-based quantitative susceptibility mapping in multiple sclerosis

Frontiers in Neuroscience
BackgroundQuantitative susceptibility mapping (QSM) has emerged as a promising paraclinical tool in multiple sclerosis (MS). This retrospective pilot study aims to evaluate whether a recently proposed deep learning-assisted, k-space-operating ...
Dimitrios G. Gkotsoulias, Dimitrios G. Gkotsoulias, Dimitrios G. Gkotsoulias, Matthias Weigel, Matthias Weigel, Matthias Weigel, Matthias Weigel, Alessandro Cagol, Alessandro Cagol, Alessandro Cagol, Alessandro Cagol, Nina de Oliveira Soares Siebenborn, Esther Ruberte, Esther Ruberte, Esther Ruberte, Josef Pfeuffer, Cristina Granziera, Cristina Granziera, Cristina Granziera   +18 more
doaj   +1 more source

Simultaneous T1 and T2 Mapping in the Brain With QuantoRAGE: An MP2RAGE Variant Using T2‐Prepared Inversion

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To develop and validate a repeatable and reproducible approach, QuantoRAGE, for simultaneous whole‐brain T1 and T2 mapping using adiabatic magnetization preparation. Methods QuantoRAGE is a 3D FLASH‐based sequence using an adiabatic T2‐prepared inversion followed by two readout blocks.
Natalia Pato Montemayor, Tâm Johan Nguyên, José P. Marques, Berk Can Açikgöz, Jessica A. M. Bastiaansen, Roland Kreis, Piotr Radojewski, Jonathan Stelter, Dimitrios Karampinos, Jocelyn Philippe, Lina Bacha, Tommaso Di Noto, Bénédicte Maréchal, Dominik Nickel, Patrick A. Liebig, Robin M. Heidemann, Tobias Kober, Jean‐Philippe Thiran, Tom Hilbert, Thomas Yu, Gian Franco Piredda, Gabriele Bonanno   +21 more
wiley   +1 more source

Accelerated MR Elastography Using Learned Neural Network Representation

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To develop a deep‐learning method for achieving fast high‐resolution MR elastography from highly undersampled data without the need for high‐quality training datasets. Methods We first reframed the deep neural network representation as a nonlinear extension of the linear subspace model, then used it to represent and reconstruct MRE ...
Xi Peng
wiley   +1 more source

Quantification of brain oxygen extraction fraction using QSM and a hyperoxic challenge

, 2020
To use hyperoxia in combination with QSM to quantify microvascular oxygen extraction fraction (OEF) and cerebral metabolic rate of oxygen (CMRO ) in healthy subjects and to cross-validate results with those from hypercapnia QSM-OEF.Ten healthy subjects ...
Ma, Yuhan, Wang, Yi, Mazerolle, Erin L., Cho, Junghun, Sun, Hongfu, Pike, G. Bruce   +5 more
core   +1 more source

Toward Brain Biosignature at 7 T—Repeatability of a Multiparametric CEST, QSM, QTI, and Sodium Imaging Protocol

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To evaluate the repeatability of an extended multiparametric 7 T MRI protocol for voxel‐wise tissue characterization combining morphological, CEST, QSM, QTI, and Sodium contrasts. Methods A repeatability study was performed in 12 volunteers without diagnosed neurological disease on a 7 T MRI system, using a comprehensive acquisition ...
Annika Hofmann, Martin Freudensprung, Lion Mücke, Tobias Wilferth, Zijin Yang, Dominik Perrin, Julius Glaser, Katharina Tkotz, Magda Duarte, Simon Weinmüller, Oliver Chaudry, Annemarie Wirth, Angelika Mennecke, Oliver Gödicke, Patrick Liebig, Lena V. Gast, Philipp Ehses, Clemens Stilianu, Rudolf Stollberger, Jannis Hanspach, Alexander German, Jürgen Winkler, Michael Uder, Arnd Doerfler, Sebastian Bickelhaupt, Andreas Maier, Katharina Breininger, Moritz Zaiss, Armin M. Nagel, Frederik B. Laun, Florian Knoll   +30 more
wiley   +1 more source

SSB: QSM vs. QFT [PDF]

, 2012
Philosophical analysis of spontaneous symmetry breaking (SSB) in particle physics has been hindered by the unavailability of rigorous formulations of models in quantum field theory (QFT).
Fraser, Doreen
core  

Retinal neurovascular alterations are associated with optic radiation microstructure in adrenomyeloneuropathy: A susceptibility separation MRI study

VIEW, EarlyView.
In a cross‐sectional cohort of 104 participants, 7 T susceptibility separation MRI and diffusion imaging were combined with retinal imaging and visual evoked potentials to characterize visual pathway involvement in adrenomyeloneuropathy (AMN). Absolute diamagnetic susceptibility, a myelin‐associated measure, and fractional anisotropy (FA) showed ...
Ronghao Li, Jun Li, Chongyi Li, Xingang Wang, Wenyu Zhou, Yangcheng Zou, Zhiming Zhen, Li Xiao, Na Liang, Zongxing Zou, Junru Yang, Hui Yang, Chunhua Fu, Weiqi Chen, Yuyu Chen, Chen Liu, Hongjiang Wei, Liang Tan   +17 more
wiley   +1 more source