Publications de Daniel Wenz | EPFL Graph Search

Publications associées (11)

A flexible framework for the design and optimization of water-excitation RF pulses using B-spline interpolation

PurposeTo implement a flexible framework, named HydrOptiFrame, for the design and optimization of time-efficient water-excitation (WE) RF pulses using B-spline interpolation, and to characterize their lipid suppression performance. MethodsAn evolutionary o ...

WILEY2024

Apparent diffusion coefficients of 31P metabolites in the human calf muscle at 7 T

Lijing Xin, Daniel Wenz, Ying Xiao, Zhiwei Huang

PurposeIn this study, we aimed to measure the apparent diffusion coefficients (ADCs) of major phosphorous metabolites in the human calf muscle at 7 T with a diffusion-weighted (DW)-STEAM sequence.MethodsA DW-STEAM sequence with bipolar gradients was implem ...

SPRINGER2023

Effect of circadian rhythm on NAD and other metabolites in human brain

Lijing Xin, Daniel Wenz, Mark Stephan Widmaier, Zhiwei Huang

Nicotinamide Adenine Dinucleotide (NAD) plays a central role in the master circadian clock of the brain (the suprachiasmatic nuclei, SCN) as demonstrated in many model organisms. NAD acts as an enzyme co-factor and substrate and its modulation was found to ...

Frontiers Media Sa2023

Dipole-Fed Rectangular Dielectric Resonator Antennas for Magnetic Resonance Imaging at 7 T: The Impact of Quasi-Transverse Electric Modes on Transmit Field Distribution

Rolf Gruetter, Daniel Wenz

Shortened dipole antennas based on rectangular dielectric blocks play an important role in ultrahigh field magnetic resonance imaging (UHF-MRI) radio frequency (RF) coil design. However, the generally assumed direct contact with the subject is difficult to ...

2021

Fast 3D 31P B1+ mapping with a weighted stack of spiral trajectory at 7 T

Salomé Sophie Célestine Baup, Lijing Xin, Katarzyna Pierzchala, Daniel Wenz, Mark Stephan Widmaier, Ying Xiao, Zhiwei Huang, Antonia Kaiser

Purpose: Phosphorus MRS (31P MRS) enables noninvasive assessment of energy metabolism, yet its application is hindered by sensitivity limitations. To overcome this, often high magnetic fields are used, leading to challenges such as spatial (Formula present ...

Wiley2025

Fast in vivo assay of creatine kinase activity in the human brain by P-31 magnetic resonance fingerprinting

Lijing Xin, Mark Stephan Widmaier, Songi Lim, Daniel Wenz

A new and efficient magnetisation transfer P-31 magnetic resonance fingerprinting (MT-P-31-MRF) approach is introduced to measure the creatine kinase metabolic rate kCK

{k}_{\mathrm{CK}}

between phosphocreatine (PCr) and adenosine triphosphate (ATP) i ...

WILEY2023

Dipolectric antenna for high-field MRI

Lijing Xin, Daniel Wenz

Purpose: To introduce the dipolectric antenna: a novel RF coil design for high-field MRI using a combination of a dipole antenna with a loop-coupled dielectric resonator antenna. ...

WILEY2023

Multi-feed, loop-dipole combined dielectric resonator antenna arrays for human brain MRI at 7 T

Thomas Dardano, Daniel Wenz

ObjectiveTo determine whether a multi-feed, loop-dipole combined approach can be used to improve performance of rectangular dielectric resonator antenna (DRA) arrays human brain for MRI at 7 T.Materials and methodsElectromagnetic field simulations in a sph ...

2023

Twisted pair transmission line coil - a flexible, self-decoupled and robust element for 7 T MRI

Lijing Xin, Daniel Wenz, Ying Xiao

Objective: This study evaluates the performance of a twisted pair transmission line coil as a transceive element for 7 T MRI in terms of physical flexibility, robustness to shape deformations, and interelement decoupling. Methods: Each coil element was cre ...

Elsevier Science Inc2024

Reproducibility of Electromagnetic Field Simulations of Local Radiofrequency Transmit Elements Tailored for 7 T MRI

Daniel Wenz

The literature reports on radiofrequency (RF) transmit (Tx) elements tailored for ultrahigh-field (UHF) magnetic resonance imaging (MRI) showed confounded reproducibility due to variations in simulation tools, modeling assumptions, and meshing techniques. ...

2025

Multi-channel system for combined transcranial focused ultrasound and magnetic resonance imaging

Daniel Wenz

The present invention relates to a system (1) for combined transcranial focused ultrasound and magnetic resonance imaging, comprising: a plurality of dielectric resonator antennas (2), each dielectric resonator antenna (2) comprising a dielectric medium (2 ...

2024