Results 81 to 90 of about 194 (131)

3D MR fingerprinting for dynamic contrast‐enhanced imaging of whole mouse brain

Magnetic Resonance in Medicine, Volume 93, Issue 1, Page 67-79, January 2025.
Abstract Purpose Quantitative MRI enables direct quantification of contrast agent concentrations in contrast‐enhanced scans. However, the lengthy scan times required by conventional methods are inadequate for tracking contrast agent transport dynamically in mouse brain. We developed a 3D MR fingerprinting (MRF) method for simultaneous T1 and T2 mapping
Yuran Zhu, Guanhua Wang, Yuning Gu, Walter Zhao, Jiahao Lu, Junqing Zhu, Christina J. MacAskill, Andrew Dupuis, Mark A. Griswold, Dan Ma, Chris A. Flask, Xin Yu   +11 more
wiley   +1 more source

QRAGE—Simultaneous multiparametric quantitative MRI of water content, T1, T2*, and magnetic susceptibility at ultrahigh field strength

Magnetic Resonance in Medicine, Volume 93, Issue 1, Page 228-244, January 2025.
Abstract Purpose To introduce quantitative rapid gradient‐echo (QRAGE), a novel approach for the simultaneous mapping of multiple quantitative MRI parameters, including water content, T1, T2*, and magnetic susceptibility at ultrahigh field strength. Methods QRAGE leverages a newly developed multi‐echo MPnRAGE sequence, facilitating the acquisition of ...
Markus Zimmermann, Zaheer Abbas, Yannic Sommer, Alexander Lewin, Shukti Ramkiran, Jörg Felder, Wieland A. Worthoff, Ana‐Maria Oros‐Peusquens, Seong Dae Yun, N. Jon Shah   +9 more
wiley   +1 more source

Estimates of B.-Y. Chen’s δˆ-Invariant in Terms of Casorati Curvature and Mean Curvature for Strictly Convex Euclidean Hypersurfaces

, 2019
B.-Y. Chen’s δˆ-invariants can be estimated in function of other curvature terms through an algebraic process using the AM-GM and AM-QM inequalities. This procedure works on strictly convexsmooth hypersurfaces lying in an Euclidean ambient space, and the
Vajiac, Mihaela, Suceava, Bogdan D.
core  

On the extrinsic principal directions of Riemannian submanifolds

, 2009
The Casorati curvature of a submanifold $M^n$ of a Riemannianmanifold ${\widetilde{M}^{n + m}}$ is known to be the normalized square of the lengthof the second fundamental form, $C = \frac{1}{n}\|h\|^2$, i.e., inparticular, for hypersurfaces, $C = \frac ...
Kowalczyk, D, Haesen, Stefan, Verstraelen, Leopold, Kowalczyk, Daniel   +3 more
core   +1 more source

Accelerated 3D metabolite T1 mapping of the brain using variable‐flip‐angle SPICE

Magnetic Resonance in Medicine, Volume 92, Issue 4, Page 1310-1322, October 2024.
Abstract Purpose To develop a practical method to enable 3D T1 mapping of brain metabolites. Theory and Methods Due to the high dimensionality of the imaging problem underlying metabolite T1 mapping, measurement of metabolite T1 values has been currently limited to a single voxel or slice.
Yibo Zhao, Yudu Li, Rong Guo, Wen Jin, Brad Sutton, Chao Ma, Georges El Fakhri, Yao Li, Jie Luo, Zhi‐Pei Liang   +9 more
wiley   +1 more source

An analysis of high order FEM and IGA for explicit dynamics: Mass lumping and immersed boundaries

International Journal for Numerical Methods in Engineering, Volume 125, Issue 16, 30 August 2024.
Summary We investigate the behavior of different shape functions for the discretization of hyperbolic problems. In particular, we consider classical Lagrange polynomials and B‐splines. The studies focus on the performance of the these functions as a spatial discretization approach combined with an explicit time marching scheme.
Lars Radtke, Michele Torre, Thomas J.R. Hughes, Alexander Düster, Giancarlo Sangalli, Alessandro Reali   +5 more
wiley   +1 more source

Basic Inequalities for Submanifolds of Conformal Kenmotsu Manifolds

Mathematics
In this paper, we have established some basic inequalities for the submanifolds of conformal Kenmotsu manifolds. As an application, we have also derived the same inequalities for the θ-slant submanifolds of conformal Kenmotsu manifolds.
Qiming Zhao, Mohamd Saleem Lone, Mehraj Ahmad Lone, Idrees Fayaz Harry, Yongqiao Wang   +4 more
doaj   +1 more source

Prospectively accelerated dynamic speech magnetic resonance imaging at 3 T using a self‐navigated spiral‐based manifold regularized scheme

NMR in Biomedicine, Volume 37, Issue 8, August 2024.
Dynamic images can be modeled as points on a smooth nonlinear manifold embedded in a high dimensional ambient space. The manifold regularization exploits the neighborhood relations of points on this manifold. Image frames sharing similar vocal tract postures are mapped as neighbors on the manifold even if they occur at different times (see the red and ...
Rushdi Zahid Rusho, Abdul Haseeb Ahmed, Stanley Kruger, Wahidul Alam, David Meyer, David Howard, Brad Story, Mathews Jacob, Sajan Goud Lingala   +8 more
wiley   +1 more source

The role of geomorphometric predictors in LUCC modeling

, 2023
An adequate choice of independent variables poses a basal step to create successful model of Land-Use and Land-Cover Change (LUCC). Spatial predictors derived from digital elevation model (DEM) are a big group of determinants that are relatively easy to ...
Minár, Jozef, Rusinko, Adam
core   +1 more source

Inequalities involving Casorati curvatures for submanifolds of real space forms with a quarter-symmetric connection

Filomat, 2022
In this paper, we obtain some inequalities based on Casorati curvature for submanifolds in a real space form with a special kind of quarter-symmetric connection.
openaire   +1 more source