Filters








15,774 Hits in 15.4 sec

Ex vivo gadoxetate relaxivities in rat liver tissue and blood at five magnetic field strengths from 1.41 to 7 T

Sabina Ziemian, Claudia Green, Steven Sourbron, Gregor Jost, Gunnar Schütz, Catherine D G Hines
2020 NMR in Biomedicine  
T1 was measured at 37 ± 3°C on NMR instruments (1.41 and 3 T), small-animal MRI (4.7 and 7 T) and clinical MRI (1.5 and 3 T).  ...  Failing to correct for the relaxivity difference between liver tissue and blood overestimates intracellular uptake rates by a factor of 2.0 at 1.41 T, 1.8 at 1.5 T, 1.5 at 3 T and 1.2 at 4.7 T.  ...  1.41 T and 1.8 at 1.5 T, gradually decreasing with increasing magnetic field strength, being 1.5 at 3 T, 1.  ... 
doi:10.1002/nbm.4401 pmid:32851735 fatcat:ts3drif6vngbfoljudrcug2i4m

Age-associated differences in triceps surae muscle composition and strength – an MRI-based cross-sectional comparison of contractile, adipose and connective tissue

Robert Csapo, Vadim Malis, Usha Sinha, Jiang Du, Shantanu Sinha
2014 BMC Musculoskeletal Disorders  
Methods: Five young (31.6 ± 7.0 yrs) and five older (83.4 ± 3.2 yrs) Japanese women were subject to a detailed MR imaging protocol, including Fast Gradient Echo, Quantitative Fat/Water (IDEAL) and Ultra-short  ...  Such quantification of the remodeling process is likely to be of functional and clinical importance in elucidating the causes of the disproportionate age-associated decrease of force compared to that of  ...  We would like to thank Yanjie Xue for her assistance with DTI fiber tracks and all of our volunteers for their kind contribution to this study.  ... 
doi:10.1186/1471-2474-15-209 pmid:24939372 pmcid:PMC4072482 fatcat:6tgw6dob6bdt5c3swgqr5eoiju

Cortical bone quality affectations and their strength impact analysis using holographic interferometry

Cesar G. Tavera Ruiz, Manuel H. De La Torre-Ibarra, J. M. Flores-Moreno, Claudio Frausto-Reyes, Fernando Mendoza Santoyo
2018 Biomedical Optics Express  
From the results obtained, a strong correlation among the hydroxyapatite, collagen and water is found that determines the bone strength.  ...  It is now accepted that bone strength is a complex property determined mainly by three factors: quantity, quality and turnover of the bone itself.  ...  (3) water (15 to 25% of the volume) [2, 3] .  ... 
doi:10.1364/boe.9.004818 pmid:30319905 pmcid:PMC6179407 fatcat:zccfhjijknfoliqeavw2t5xc4a

Relationship Between Quantitative MRI Biomarkers and Patient-Reported Outcome Measures After Cartilage Repair Surgery: A Systematic Review

Drew A. Lansdown, Kevin Wang, Eric Cotter, Annabelle Davey, Brian J. Cole
2018 Orthopaedic Journal of Sports Medicine  
Five studies on T2 mapping showed a correlation between T2 relaxation times and clinical outcome scores.  ...  Two dGEMRIC studies found a correlation between T1 relaxation times and clinical outcome scores.  ...  are limited by lower resolutions, potential need for higher field strength scanners, additional imaging time requirements, and lack of clearly established clinical relevance compared with traditional  ... 
doi:10.1177/2325967118765448 pmid:29662912 pmcid:PMC5898666 fatcat:eyvf62x56ndo3jv7j43gyxo5oy

A Single-Scan, Rapid Whole-Brain Protocol for Quantitative Water Content Mapping With Neurobiological Implications

Ana-Maria Oros-Peusquens, Ricardo Loução, Zaheer Abbas, Vincent Gras, Markus Zimmermann, N. J. Shah
2019 Frontiers in Neurology  
The receive and transmit corrections, which are increasingly large at higher field strengths and for highly segmented coil arrays, are multiplicative and can be approached heuristically using a bias field  ...  The method was tested on 21 healthy volunteers at 3T field strength.  ...  The proposed field strength (1.5 vs. 3T) comparison is an experimental way of studying the influence of SNR on water content values.  ... 
doi:10.3389/fneur.2019.01333 pmid:31920951 pmcid:PMC6934004 fatcat:lulbdf4fbfaqdgnftz4rbh6vri

Development of a temperature-controlled phantom for magnetic resonance quality assurance of diffusion, dynamic, and relaxometry measurements

Neil P. Jerome, Marianthi-Vasiliki Papoutsaki, Matthew R. Orton, Harold G. Parkes, Jessica M. Winfield, Michael A. Boss, Martin O. Leach, Nandita M. deSouza, David J. Collins
2016 Medical Physics (Lancaster)  
M.O.L. is a NIHR Senior Investigator. The authors acknowledge CR-UK and EPSRC support to the Cancer Imaging Centre at ICR and RMH in association with MRC and Department of Health Nos.  ...  C1060/A10334 and C1060/A16464, NHS funding to the NIHR Biomedicine Research Centre, the Clinical Research Facility in Imaging, and the CR-UK and EPSRC Paediatric Imaging Programme No. C7809/A10342.  ...  and field strengths as a quality assurance tool in multicenter clinical trials.  ... 
doi:10.1118/1.4948997 pmid:27277048 fatcat:2gwh6elja5aazl4jvsmklusnoq

Musculoskeletal MRI at 7 T: do we need more or is it more than enough?

Giacomo Aringhieri, Virna Zampa, Michela Tosetti
2020 European Radiology Experimental  
European Union and Food and Drug Administration approvals for clinical imaging at UHF have been the first step towards a more routinely use of this technology, but some drawbacks are still present limiting  ...  Further studies are needed to consolidate the added value of the use of UHF-MRI in the routine clinical practice and promising efforts in technology development are already in progress.  ...  [32] compared T1rho mapping of the knee in healthy volunteers and patients with OA at 3 T and 7 T and found increased T1rho values in the patellar cartilage in patient with OA at both field strengths  ... 
doi:10.1186/s41747-020-00174-1 pmid:32761480 fatcat:vop5ceckdrbp3g22xmd3mpjeia

Advanced musculoskeletal MRI at ultra-high field (7 T)

Siegfried Trattnig, Klaus M Friedrich, Wolfgang Bogner, Goetz H Welsch
2010 Imaging in Medicine  
Studies comparing T 2 relaxation at 1.5 and 3.0 T reported a less pronounced dependence on the magnetic field strength compared with longitudinal T 1 relaxation, however, a shortening of T 2 values at  ...  a standard field strength (1.5 T).  ...  Int. 20(5), 779-785 (2009). 7 Goldstein SA, Goulet RW, Mccubbrey D: Measurement and significance of 3-dimensional architecture to the mechanical integrity of trabecular bone. Calcif.  ... 
doi:10.2217/iim.09.26 fatcat:l7lunmuiffedtaefbrjrexnygu

Characterization ofT2* heterogeneity in human brain white matter

Tie-Qiang Li, Bing Yao, Peter van Gelderen, Hellmut Merkle, Stephen Dodd, Lalith Talagala, Alan P. Koretsky, Jeff Duyn
2009 Magnetic Resonance in Medicine  
at 7.0 T can also be detected, albeit weaker, at 1.5 and 3.0 T.  ...  In order to study the origin of this heterogeneity, we performed T 2 * measurements at 1.5, 3.0, and 7.0 T in normal volunteers.  ...  Matsuda and S. Chen. This work was supported by the intramural research program of the NIH, NINDS.  ... 
doi:10.1002/mrm.22156 pmid:19859939 pmcid:PMC3508464 fatcat:wunlvyu67bczhe2z373chdtsv4

Ultrashort echo time MRI of pulmonary water content: assessment in a sponge phantom at 1.5 and 3.0 Tesla

Francesco Molinari, Ananth J Madhuranthakam, Robert Lenkinski, Alexander A Bankier
2013 Diagnostic and Interventional Radiology  
ORIGINAL ARTICLE PURPOSE We aimed to develop a predictive model for lung water content using ultrashort echo time (UTE) magnetic resonance imaging (MRI) and a sponge phantom.  ...  Figure 3 .Figure 5 35 a, b. Signal-to-noise ratio (SNR) of the sponges at 1.5 T (a) and 3.0 T (b).  ...  Proton density decreased proportionally with the decreases in both lung water and field strength (from 3.5 to 2.0 mL; proton density range at 1.5 T, 30.5-17.3 ; at 3.0 T, 84.2-41.5).  ... 
doi:10.5152/dir.2013.13232 pmid:24317335 pmcid:PMC4463248 fatcat:5shnivhafrdy5afdv4oz23kqdy

Quantitative techniques for musculoskeletal MRI at 7 Tesla

Neal K. Bangerter, Meredith D. Taylor, Grayson J. Tarbox, Antony J. Palmer, Daniel J. Park
2016 Quantitative Imaging in Medicine and Surgery  
There has been considerable research work on musculoskeletal applications at 7 Tesla over the past decade, including techniques for ultra-high resolution morphological imaging, 3D T2 and T2* mapping, ultra-short  ...  TE applications, diffusion tensor imaging of cartilage, and several techniques for assessing proteoglycan content in cartilage.  ...  Imaging studies at the University of Oxford were also supported by a  ... 
doi:10.21037/qims.2016.12.12 pmid:28090448 pmcid:PMC5219959 fatcat:u2gsb3loxfg5ncwb2pvxtpyqse

7-T MR-from research to clinical applications?

Ewald Moser, Freddy Stahlberg, Mark E. Ladd, Siegfried Trattnig
2011 NMR in Biomedicine  
Over 20 000 MR systems are currently installed worldwide and, although the majority operate at magnetic fields of 1.5 T and below (i.e. about 70%), experience with 3-T (in high-field clinical diagnostic  ...  Complementary to previous studies, this review attempts to provide an overview of ultrahigh-field MR research with special emphasis on emerging clinical applications at 7 T.  ...  As a consequence, high-field MRI at 3 T has now become the benchmark for clinical MRI research and qualified clinical investigations.  ... 
doi:10.1002/nbm.1794 pmid:22102481 fatcat:whwmh43ejnfzncxuv2agwf6du4

B0-field dependence of MRI T1 relaxation in human brain

Yicun Wang, Peter van Gelderen, Jacco A. de Zwart, Jeff H. Duyn
2020 NeuroImage  
In this study, T1-weighted MRI was acquired in a group of eight healthy volunteers at four clinically relevant field strengths (0.55, 1.5, 3 and 7 ​T) using the same pulse sequence at a single site, and  ...  Despite the explanatory power of this theory and substantial support from in-vitro experiments at low fields (<3T), in-vivo evidence across clinically relevant field strengths is lacking.  ...  The authors thank Adrienne Campbell-Washburn for assistance with the 0.55 T scanner, John Butman for use of the 1.5 T scanner, Susan Guttman and Steven Newman for their help with volunteer recruitment,  ... 
doi:10.1016/j.neuroimage.2020.116700 pmid:32145438 pmcid:PMC7165058 fatcat:zxa6cuovxjhqngzeua7wwgtpra

Quantitative Analysis of the Specific Absorption Rate Dependence on the Magnetic Field Strength in ZnxFe3−xO4 Nanoparticles

Mohamed Alae Ait Kerroum, Cristian Iacovita, Walid Baaziz, Dris Ihiawakrim, Guillaume Rogez, Mohammed Benaissa, Constantin Mihai Lucaciu, Ovidiu Ersen
2020 International Journal of Molecular Sciences  
Above this value, a clear saturation effect of SAR was observed that was successfully described qualitatively and quantitatively by considering the non-linear field's effects and the magnetic field dependence  ...  The SAR values are reduced upon the immobilization of the nanoparticles in a solid matrix being significantly increased by a pre-alignment step in a uniform static magnetic field before immobilization.  ...  Developing a model in which, at high magnetic field amplitudes, the magnetization follows a Langevin type dependence on the field strength and, considering the field dependence of both the Neel and Brown  ... 
doi:10.3390/ijms21207775 pmid:33096631 fatcat:6opowd4xg5c2rpklmggrezz6rm

Cartilage Repair Surgery: Outcome Evaluation by Using Noninvasive Cartilage Biomarkers Based on Quantitative MRI Techniques?

Pia M. Jungmann, Thomas Baum, Jan S. Bauer, Dimitrios C. Karampinos, Benjamin Erdle, Thomas M. Link, Xiaojuan Li, Siegfried Trattnig, Ernst J. Rummeny, Klaus Woertler, Goetz H. Welsch
2014 BioMed Research International  
T2 mapping, T1rho mapping, delayed gadolinium-enhanced MRI of cartilage (dGEMRIC), and diffusion weighted imaging (DWI) are applicable on most clinical 1.5 T and 3 T MR scanners.  ...  Quantitative MR biomarkers detect early degeneration of articular cartilage, mainly represented by an increasing water content, collagen disruption, and proteoglycan loss.  ...  Acknowledgments This work was supported by the German Research Foundation (DFG) and the Technische Universitaet Muenchen within the funding programme Open Access Publishing.  ... 
doi:10.1155/2014/840170 pmid:24877139 pmcid:PMC4024422 fatcat:2yotpksyr5ejbhvkn75vsr4ptm
« Previous Showing results 1 — 15 out of 15,774 results