Results 161 to 170 of about 4,917,448 (190)

On the water–fat in-phase assumption for quantitative susceptibility mapping (QSM)

ISMRM Annual Meeting, 2023
Gradient echo imaging using in-phase echoes has been proposed to reduce the field-map estimation in water–fat regions to a convex nonlinear least squares problem. Conventionally, the in-phase assumption is based on a single-peak fat-model.
Christof Boehm, Jakob Meineke, Kilian Weiss, Marcus Makowski, Dimitrios Karampinos   +4 more
openaire   +1 more source

Use of quantitative susceptibility mapping (QSM) in progressive multifocal leukoencephalopathy

Journal of Neuroradiology, 2016
Progressive multifocal leukoencephalopathy (PML) is an opportunistic demyelinating encephalopathy related to JC virus. Its characteristics on conventional brain MRI are well known and are important for the diagnosis.To analyze SWI hypointensities recently described in U-fibers and cortex adjacent to the white matter lesions of PML.Prospective study ...
Carra-Dallière, C., Menjot de Champfleur, Nicolas, Deverdun, Jeremy, Ayrignac, Xavier, Nerrant, E., Makinson, Alain, Casanova, Marie-Laure, Labauge, Pierre   +7 more
openaire   +2 more sources

Potential application of the quantitative susceptibility mapping (QSM) in MR-guided radiation therapy

Physics in Medicine & Biology, 2019
<p>Magnetic resonance-guided radiation therapy (MR-GRT) offers great potential to improve radiation treatment outcomes by providing more accurate and patient-tailored therapy. Despite superior soft tissue contrast in MRI, one of the challenges towards MRI-only workflows is that the process often requires some sort of 'MR-invisible' metal-based ...
Reyhaneh, Nosrati, Moti, Paudel, Ananth, Ravi, Ana, Pejovic-Milic, Gerard, Morton, Greg J, Stanisz   +5 more
openaire   +2 more sources

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

Vessel Orientation Constrained Quantitative Susceptibility Mapping (QSM) Reconstruction

2016
QSM is used to estimate the underlying tissue magnetic susceptibility and oxygen saturation in veins. This paper presents vessel orientation as a new regularization term to improve the accuracy of \(l_1\) regularized QSM reconstruction in cerebral veins. For that purpose, the vessel tree is first extracted from an initial QSM reconstruction.
Suheyla Cetin, Berkin Bilgic, Audrey P. Fan, Samantha J. Holdsworth, Gözde B. Ünal   +4 more
openaire   +2 more sources

Quantitative Susceptibility Mapping (QSM) as a Means to Measure Brain Iron? A Post Mortem Validation Study

NeuroImage, 2012
Quantitative susceptibility mapping (QSM) is a novel technique which allows determining the bulk magnetic susceptibility distribution of tissue in vivo from gradient echo magnetic resonance phase images. It is commonly assumed that paramagnetic iron is the predominant source of susceptibility variations in gray matter as many studies have reported a ...
Walter Goessler, Andreas Deistung, Jürgen R Reichenbach   +2 more
exaly   +4 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

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   +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
openaire   +2 more sources

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   +3 more sources