Results 141 to 150 of about 2,779 (160)

Characterization of Cardiac Quantitative Susceptibility Mapping (QSM)

ISMRM Annual Meeting
Cardiac Quantitative Susceptibility Mapping (QSM) is a promising technique for the evaluation of iron levels in the myocardium, particularly after a hemorrhagic infarction. In this abstract, we validate the accuracy of our QSM acquisition and reconstruction procedure in phantom experiments, and characterize its precision and repeatability in the ...
Andrew Tyler, Li Huang, Radhouene Neji, Ronald Mooiweer, Pier-Giorgio Masci, Sébastien Roujol   +5 more
openaire   +1 more source

Enhanced quantitative susceptibility mapping (QSM) using real‐time field control

Magnetic Resonance in Medicine, 2018
PURPOSE To assess the potential of a real-time field-control (FC) system for mitigating effects of spatiotemporal field fluctuations in quantitative susceptibility mapping (QSM) at 7 T. METHODS Magnitude, phase, and QSM images of phantoms and healthy volunteers were acquired under standard conditions and under induced field perturbation (FP) (phantoms:
Bertram J Wilm, Klaas P Pruessmann, Daniel Nanz   +2 more
exaly   +2 more sources

Inhomogeneity-informed Field-fitting for Quantitative Susceptibility Mapping (if-QSM)

ISMRM Annual Meeting
Motivation: Inhomogeneity in measured multi-gradient echo (mGRE) field data corrupts reconstructions of quantitative susceptibility maps by obscuring the tissue field of interest with strong background field. Goal(s): To extend the voxel spread function (VSF) library implementation to a nonzero phase offset and demonstrate improvements on QSM. Approach:
Alexandra Roberts, Alexey Dimov, Thanh Nguyen, Pascal Spincemaille, Yi Wang   +4 more
openaire   +1 more source

Diffusion-QSM: Diffusion Model With Time-Travel and Resampling Refinement for Quantitative Susceptibility Mapping

IEEE Transactions on Biomedical Engineering
Quantitative susceptibility mapping (QSM) is a useful magnetic resonance imaging technique. We aim to propose a deep learning (DL)-based method for QSM reconstruction that is robust to data perturbations.We developed Diffusion-QSM, a diffusion model-based method with a time-travel and resampling refinement module for high-quality QSM reconstruction ...
Ming Zhang, Chunlei Liu 0004, Yuyao Zhang 0005, Hongjiang Wei   +3 more
openaire   +2 more sources

Internal structures of the globus pallidus in patients with Parkinson’s disease: evaluation with quantitative susceptibility mapping (QSM)

European Radiology, 2014
The aim of this study was to assess the susceptibility change in medial and lateral globus pallidus (GPm and GPl) related to age separately, using quantitative susceptibility mapping (QSM) and to determine whether QSM can depict GPm in Parkinson's disease (PD) patients.QSM was performed in 19 PD patients and in 41 normal control (NC) subjects.
Satoru, Ide, Shingo, Kakeda, Issei, Ueda, Keita, Watanabe, Yu, Murakami, Junji, Moriya, Atsushi, Ogasawara, Koichiro, Futatsuya, Toru, Sato, Norihiro, Ohnari, Kazumasa, Okada, Atsuji, Matsuyama, Hitoshi, Fujiwara, Masanori, Hisaoka, Sadatoshi, Tsuji, Tian, Liu, Yi, Wang, Yukunori, Korogi   +17 more
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Cerebral metabolic rate of oxygen (CMRO₂) mapping with hyperventilation challenge using quantitative susceptibility mapping (QSM)

Magnetic Resonance in Medicine, 2016
PurposeOur objective was to demonstrate the feasibility of using hyperventilation as an efficient vasoconstrictive challenge and prior knowledge as denoising constraints for cerebral metabolic rate of oxygen (CMRO2) mapping based upon quantitative susceptibility mapping (QSM).MethodsThree‐dimensional (3D) multi‐echo gradient echo and arterial spin ...
Jingwei, Zhang, Dong, Zhou, Thanh D, Nguyen, Pascal, Spincemaille, Ajay, Gupta, Yi, Wang   +5 more
openaire   +2 more sources

Flow-QSM: bridging learned priors and physical models for quantitative susceptibility mapping

Physics in Medicine & Biology
Abstract Objective. Quantitative susceptibility mapping (QSM) is a magnetic resonance imaging technique that quantifies tissue magnetic susceptibility by solving an ill-posed inverse problem from measured magnetic field perturbations.
Haoming Qin, Yutao Chen, Lijun Bao
openaire   +1 more source

INR-QSM: unsupervised quantitative susceptibility mapping using implicit neural representation

ISMRM Annual Meeting
This study introduced an unsupervised deep learning-based method for QSM reconstruction using implicit neural representation (INR-QSM), a training databases-free method for high-quality QSM reconstruction. In INR-QSM, the susceptibility map was represented as a continuous function of the spatial coordinates.
Ming Zhang, Yuyao Zhang, Hongjiang Wei
openaire   +1 more source

DF‐QSM: Data Fidelity based Hybrid Approach for Improved Quantitative Susceptibility Mapping of the Brain

NMR in Biomedicine
AbstractQuantitative Susceptibility Mapping (QSM) is an advanced magnetic resonance imaging (MRI) technique to quantify the magnetic susceptibility of the tissue under investigation. Deep learning methods have shown promising results in deconvolving the susceptibility distribution from the measured local field obtained from the MR phase.
Naveen Paluru, Raji Susan Mathew, Phaneendra K. Yalavarthy   +2 more
openaire   +2 more sources

Studying psychiatric diseases using quantitative susceptibility mapping (QSM)

Quantitative Susceptibility Mapping (QSM), a sophisticated MRI-based technique for quantifying brain magnetic susceptibility, has emerged as a valuable tool in exploring neurodegenerative diseases and, more recently, psychiatric disorders such as first-episode schizophrenia, depression, anxiety, and stress.
openaire   +1 more source