نتایج جستجو برای: Relaxometry

تعداد نتایج: 838  

Journal: :Journal of magnetism and magnetic materials 2009
Natalie L Adolphi Dale L Huber Jason E Jaetao Howard C Bryant Debbie M Lovato Danielle L Fegan Eugene L Venturini Todd C Monson Trace E Tessier Helen J Hathaway Christian Bergemann Richard S Larson Edward R Flynn

Magnetite nanoparticles (Chemicell SiMAG-TCL) were characterized by SQUID-relaxometry, susceptometry, and TEM. The magnetization detected by SQUID-relaxometry was 0.33% of that detected by susceptometry, indicating that the sensitivity of SQUID-relaxometry could be significantly increased through improved control of nanoparticle size. The relaxometry data were analyzed by the moment superpositi...

2010
Julia V. Bayer Fabian Jaeger Gabriele E. Schaumann

Proton NMR relaxometry is a very powerful tool for investigating porous media and their interaction with water or other liquids and the mobility and interaction of organic molecules in solution. It is commonly used in material science or earth science. However, it is only scarcely applied in soil science although it shows great potential for helping to understand water uptake into the soil matr...

2016
Bruna Ferreira Gomes Juliana Soares da Silva Burato Carlos Manuel Silva Lobo Luiz Alberto Colnago

We have demonstrated that the relaxometry technique is very efficient to quantify paramagnetic ions during in situ electrolysis measurements. Therefore, the goal of this work was to validate the relaxometry technique in the determination of the concentration of the ions contained in electrolytic solutions, Cu(2+), Ni(2+), Cr(3+), and Mn(2+), and compare it with other analytical methods. Two dif...

2015
Hye-Jin Moon Yongmin Chang Yeong Seon Lee Huijin Song Hyuk Won Chang Jeonghun Ku Richard P Allen Christopher J Earley Yong Won Cho

PURPOSE Magnetic resonance imaging relaxometry studies differed on the relaxometry methods and their approaches to determining the regions of interest (ROIs) in restless legs syndrome (RLS) patients. These differences could account for the variable and inconsistent results found across these studies. The aim of this study was to assess the relationship between the different relaxometry methods ...

Journal: :European journal of radiology 2012
Oktay Algin Gokhan Gokalp Gokhan Ocakoglu Ahmet Ursavas Ozlem Taskapilioglu Bahattin Hakyemez

PURPOSE To evaluate neurochemical and structural changes in the patients with newly diagnosed obstructive sleep apnea syndrome (OSAS) by MR spectroscopy (MRS), T2 relaxometry, and diffusion weighted imaging (DWI). MATERIAL AND METHODS Following the acquisition of routine cranial MR, MRS, T2 relaxometry, and DWI images; spectroscopic metabolite ratios and DWI-T2 relaxometry findings of the tha...

2014
Michael Haimerl Niklas Verloh Claudia Fellner Florian Zeman Andreas Teufel Stefan Fichtner- Feigl Andreas G. Schreyer Christian Stroszczynski Philipp Wiggermann

Gd-EOB-DTPA is a hepatocyte-specific MRI contrast agent. Due to its hepatocyte-specific uptake and paramagnetic properties, functioning areas of the liver exhibit shortening of the T1 relaxation time. We report the potential use of T1 relaxometry of the liver with Gd-EOB-DTPA-enhanced magnetic resonance imaging (MRI) for estimating the liver function as expressed by the MELD score. 3 T MRI rela...

Journal: :Epilepsy research 2006
Pedro M Gonçalves Pereira Eduardo Oliveira Pedro Rosado

OBJECTIVES The aims of the study were (i) to examine the localizing value of three MRI quantitative modalities (qMRI) currently used for the analysis of the hippocampus and amygdala in the context of pre-surgical screening and (ii) to propose a step-by-step protocol based on the sensitivity and performance of the different MR techniques. METHODS Ninety-two adults with chronic mesial temporal ...

2017
Miguel Molina-Romero Pedro A Gómez Jonathan I Sperl Derek K Jones Marion I Menzel Bjoern H Menze

We introduce a new approach to characterise brain tissue microstructure combining diffusion MRI and relaxometry. The tissue is modelled as a composition of water pools with distinct T2 and diffusivities. Mathematically, we establish a blind source separation framework that we solve using sparse component analysis. Results show that this technique is able to extract distinct diffusion and relaxo...

2017
Michael Haimerl Niklas Verloh Florian Zeman Claudia Fellner Dominik Nickel Sven A. Lang Andreas Teufel Christian Stroszczynski Philipp Wiggermann

Gadolinium ethoxybenzyl-diethylenetriaminepentaacetic acid (Gd-EOB-DTPA) is a paramagnetic hepatobiliary magnetic resonance (MR) contrast agent. Due to its OATP1B1/B3-dependent hepatocyte-specific uptake and paramagnetic properties increasing evidence has emerged to suggest that Gd-EOB-DTPA-enhanced MRI can be potentially used for evaluation of liver function. In this paper we compare the diagn...

2016
Ariel Hafftka Wojciech Czaja Richard G. Spencer

Title of dissertation: TENSOR COMPLETION FOR MULTIDIMENSIONAL INVERSE PROBLEMS WITH APPLICATIONS TO MAGNETIC RESONANCE RELAXOMETRY Ariel Hafftka, Doctor of Philosophy, 2016 Dissertation directed by: Professor Wojciech Czaja Department of Mathematics This thesis deals with tensor completion for the solution of multidimensional inverse problems. We study the problem of reconstructing an approxima...

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