Results 131 to 140 of about 2,779 (160)
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A data-driven deep learning pipeline for quantitative susceptibility mapping (QSM)
Magnetic Resonance Imaging, 2022This study developed a data-driven optimization to improve the accuracy of deep learning QSM quantification.The proposed deep learning QSM pipeline consisted of two projections onto convex set (POCS) models designed to decouple trainable network components with the spherical mean value (SMV) filters and dipole kernel in the data-driven optimization ...
Zuojun, Wang +6 more
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Quantitative Susceptibility Mapping (QSM) Algorithms: Mathematical Rationale and Computational Implementations [PDF]
IEEE Transactions on Biomedical Engineering, 2017 Quantitative susceptibility mapping (QSM) solves the magnetic field-to-magnetization (tissue susceptibility) inverse problem under conditions of noisy and incomplete field data acquired using magnetic resonance imaging. Therefore, sophisticated algorithms are necessary to treat the ill-posed nature of the problem and are reviewed here.
Youngwook Kee +2 more
exaly +4 more sources
On the water–fat in-phase assumption for quantitative susceptibility mapping (QSM)
ISMRM Annual Meeting, 2023Gradient 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 +4 more
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Use of quantitative susceptibility mapping (QSM) in progressive multifocal leukoencephalopathy
Journal of Neuroradiology, 2016Progressive 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 ...
C, Carra-Dalliere +7 more
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Quantitative susceptibility mapping (QSM) and R2* in the human brain at 3 T
Zeitschrift Fur Medizinische Physik, 2018 Xiang Feng +2 more
exaly +2 more sources
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 +5 more
openaire +2 more sources
<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 +5 more
openaire +2 more sources
Enhanced quantitative susceptibility mapping (QSM) using real‐time field control
Magnetic Resonance in Medicine, 2017PurposeTo 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.MethodsMagnitude, phase, and QSM images of phantoms and healthy volunteers were acquired under standard conditions and under induced field perturbation (FP) (phantoms ...
Özbay, Pinar Senay +4 more
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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 ...
Christian Langkammer +2 more
exaly +3 more sources
Vessel Orientation Constrained Quantitative Susceptibility Mapping (QSM) Reconstruction
2016QSM 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 +4 more
openaire +1 more source
NMR in Biomedicine, 2015
The purpose of this study was to measure the regional change of magnetic susceptibility in human brain upon inhalation of 100% oxygen by MRI quantitative susceptibility mapping (QSM). Fourteen healthy volunteers were scanned in a 3 T MR scanner with a 3D multi‐gradient‐echo sequence while breathing medical air (normoxia) and pure oxygen (hyperoxia ...
Cristina Rossi +2 more
exaly +4 more sources
The purpose of this study was to measure the regional change of magnetic susceptibility in human brain upon inhalation of 100% oxygen by MRI quantitative susceptibility mapping (QSM). Fourteen healthy volunteers were scanned in a 3 T MR scanner with a 3D multi‐gradient‐echo sequence while breathing medical air (normoxia) and pure oxygen (hyperoxia ...
Cristina Rossi +2 more
exaly +4 more sources