Results 141 to 150 of about 1,217,161 (237)

Composition operators on Bloch and Hardy type spaces

, 2022
The main purpose of this paper is to discuss Hardy type spaces, Bloch type spaces and the composition operators of complex-valued harmonic functions. We first establish a sharp estimate of the Lipschitz continuity of complex-valued harmonic functions in ...
Chen, Shaolin, Hamada, Hidetaka, Zhu, Jian-Feng   +2 more
core  

Multi‐Vendor and Multi‐Site Characterization of 13C Coils for Clinical Studies

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Due to the inherently low signal‐to‐noise ratio (SNR) domain for 13C imaging, optimal coil performance is essential to maximize data quality. Quality control (QC) for 13C coils employed in magnetic resonance spectroscopy (MRS) is of paramount importance.
Emil S. Christensen, Andreas Clemmensen, Esben S. S. Hansen, Jonathan Birchall, Mary A. McLean, Christoffer Laustsen, Andreas Kjaer, Thomas L. Andersen   +7 more
wiley   +1 more source

Essential Norm of Generalized Integral-Type Operator from the Fractional Cauchy Transform Space into Weighted Bloch and Dirichlet Spaces

Axioms
In this paper, we investigate the generalized integral-type operator acting between the fractional Cauchy transform space and two classical analytic function spaces: the weighted Bloch space and the weighted Dirichlet space.
Mostafa Hassanlou, Ebrahim Abbasi, Maryam G. Alshehri   +2 more
doaj   +1 more source

Improved Accuracy of Multidimensional Spatially‐Selective Saturation RF Pulses for Short‐Repetition‐Time Steady‐State Imaging

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To introduce and evaluate a novel RF pulse design algorithm for multi‐dimensional spatially tailored excitation that is optimized for spoiled steady‐state gradient echo MRI sequences. Methods Existing multi‐dimensional RF pulse design algorithms optimize RF and gradient waveforms using a loss function based on a single RF pulse ...
Yongli He, Douglas C. Noll, Jon‐Fredrik Nielsen   +2 more
wiley   +1 more source

Stevic-Sharma operators from Logarithmic Bergman-type spaces to Bloch spaces

四川大学学报. 自然科学版, 2018
Let D be the open unit disk in the complex plane C. In order to unify the products of composition, multiplication and differentiation operators, Stevic and Sharma introduced the following, so-called, Stevic-Sharma operator.
HU Xiao-Bo
doaj  

OpenMRF: A Modular, Vendor‐Neutral Open‐Source Framework for Magnetic Resonance Fingerprinting Using Pulseq

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Widespread adoption and methodological advancement of magnetic resonance fingerprinting (MRF) are limited by the lack of unified, reproducible implementation frameworks and fragmented open‐source tools. To address these barriers, we introduce OpenMRF—a comprehensive Pulseq‐based solution—designed to enable standardized and transferable
Tom Griesler, Jannik Stebani, Sydney Kaplan, Ivaylo Angelov, Petra Albert, Tobias Wech, Martin Blaimer, Xiang Wang, Qingping Chen, Maxim Zaitsev, Zhibo Zhu, Qi Liu, Peter Martin, Jon‐Fredrik Nielsen, Jesse I. Hamilton, Peter Nordbeck, Nicole Seiberlich, Maximilian Gram   +17 more
wiley   +1 more source

Intertwining relation of integral-type operators on logarithmic Bloch-type spaces

四川大学学报. 自然科学版, 2019
In this paper, we study the intertwining relation of a class of integral-type operators by composition operators on logarithmic Bloch-type spaces, and give an equivalent condition.
HAN Xue_Hong, ZENG Hong_Gang
doaj  

Whole‐Brain Diffusion MRI at 7T With Universal Multiband GRAPE pTx Pulses

Magnetic Resonance in Medicine, EarlyView.
Purpose To improve signal strength and homogeneity of whole‐brain diffusion‐weighted imaging (DWI) at 7T. Methods Universal multiband excitation and refocusing pulses were optimized with the gradient ascent pulse engineering (GRAPE) algorithm across a database of B1+$$ {B}_1^{+} $$ and B0$$ {B}_0 $$ maps obtained from 20 subjects.
Marten Laufenberg, Daniel Löwen, Mónica Ferreira, Nicolas Boulant, Jennifer Faber, Tony Stöcker   +5 more
wiley   +1 more source

COMPOSITION OPERATORS ON BLOCH TYPE SPACES

, 2015
. Let Bα and Bα0 denote the α−Bloch spaces and little α−Bloch spaces. An analytic map ϕ of the unit disk into itself induces an operator Cϕ on analytic functions by composition. We study the boundedness and compactness of composition operators Cϕ from Bα(
Zengjian Lou, Lou, Z
core  

Predicting Mesoscopic Larmor Frequency Shifts in Ex Vivo Porcine Optic Nerve

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Larmor frequency shifts in white matter (WM) vary with fiber orientation due to anisotropic microstructure. Since clinical voxels are significantly larger than these microscopic frequency variations, the measured signal represents a bulk average of local shifts.
Anders Dyhr Sandgaard, André Pampel, Roland Müller, Niklas Wallstein, Toralf Mildner, Carsten Jäger, Markus Morawski, Aage Kristian Olsen Alstrup, Harald E. Möller, Sune Nørhøj Jespersen   +9 more
wiley   +1 more source