نتایج جستجو برای: هسته mre

تعداد نتایج: 12042  

Journal: :Magnetic resonance in medicine 2016
Nadège Corbin Jonathan Vappou Elodie Breton Quentin Boehler Laurent Barbé Pierre Renaud Michel de Mathelin

PURPOSE MRI-guided thermal ablations require reliable monitoring methods to ensure complete destruction of the diseased tissue while avoiding damage to the surrounding healthy tissue. Based on the fact that thermal ablations result in substantial changes in biomechanical properties, interventional MR elastography (MRE) dedicated to the monitoring of MR-guided thermal therapies is proposed here....

Journal: :Journal of magnetic resonance imaging : JMRI 2014
Sudhakar K Venkatesh Gang Wang Lynette L S Teo Bertrand W L Ang

PURPOSE To determine normal liver stiffness values evaluated with magnetic resonance elastography (MRE) in healthy normal Asian volunteers and assess its reproducibility. MATERIALS AND METHODS Liver stiffness was evaluated with MRE in 41 healthy Asians (23 females, 18 males; mean age, 41.8 years, and mean body mass index [BMI], 23.4 kg/m(2) ) on a 1.5T clinical scanner. The correlations betwe...

Journal: :Magnetic resonance in medicine 2007
Meng Yin John Woollard Xiaofang Wang Vicente E Torres Peter C Harris Christopher J Ward Kevin J Glaser Armando Manduca Richard L Ehman

Chronic liver disease is a world-wide problem that causes progressive hepatic fibrosis as a hallmark of progressive injury. At present, the gold standard for diagnosing hepatic fibrosis is liver biopsy, which is an invasive method with many limitations, including questionable accuracy and risks of complications. MR elastography (MRE), a phase-contrast MRI technique for quantitatively assessing ...

Journal: :Physics in medicine and biology 2011
K P McGee D Lake Y Mariappan R D Hubmayr A Manduca K Ansell R L Ehman

Magnetic resonance elastography (MRE) is a non-invasive phase-contrast-based method for quantifying the shear stiffness of biological tissues. Synchronous application of a shear wave source and motion encoding gradient waveforms within the MRE pulse sequence enable visualization of the propagating shear wave throughout the medium under investigation. Encoded shear wave-induced displacements are...

Journal: :Investigative radiology 2006
Dieter Klatt Patrick Asbach Jens Rump Sebastian Papazoglou Rajan Somasundaram Jens Modrow Jürgen Braun Ingolf Sack

OBJECTIVE The objective of this study was to introduce an magnetic resonance elastography (MRE) protocol based on fractional motion encoding and planar wave acquisition for rapid measurements of in vivo human liver stiffness. MATERIALS AND METHODS Vibrations of a remote actuator membrane were fed by a rigid rod to the patient's surface beneath the right costal arch resulting in axial shear de...

Journal: :Physics in medicine and biology 2014
Heiko Tzschätzsch Selcan Ipek-Ugay Jing Guo Kaspar-Josche Streitberger Enno Gentz Thomas Fischer Robert Klaua Michael Schultz Jürgen Braun Ingolf Sack

Elastography is capable of noninvasively detecting hepatic fibrosis by imposing mechanical stress and measuring the viscoelastic response in the liver. Magnetic resonance elastography (MRE) relies on time-harmonic vibrations, while most dynamic ultrasound elastography methods employ transient stimulation methods. This study attempts to benefit from the advantages of time-harmonic tissue stimula...

Journal: :Endocrinology 2012
Pia Bagamasbad Tim Ziera Steffen A Borden Ronald M Bonett Aaron M Rozeboom Audrey Seasholtz Robert J Denver

Stress has complex effects on hippocampal structure and function, which consequently affects learning and memory. These effects are mediated in part by circulating glucocorticoids (GC) acting via the intracellular GC receptor (GR) and mineralocorticoid receptor (MR). Here, we investigated GC regulation of Krüppel-like factor 9 (KLF9), a transcription factor implicated in neuronal development an...

2002
K. J. Glaser J. P. Felmlee R. L. Ehman

Traditional MR elastography (MRE) involves the measurement of 2-D or 3-D shear wave displacement data from which the shear stiffness distribution in an object is estimated. These acquisitions often require 2 to 8 minutes for 2-D data, and as much as 30 minutes for 3-D data. When performed in vivo, patient motion and patient comfort can become an issue with these long scan times. The hypothesis ...

Journal: :Frontiers in Materials 2021

To accurately characterize the mechanical behavior of magnetorheological elastomer (MRE) under a wide range strain amplitude, excitation frequency, and magnetic field, viscoelastic fractional derivative was introduced, modified Bouc-Wen model based on for MRE in nonlinear region established. The can describe hysteretic characteristics region, but it cannot simulate magneto-viscoelasticity frequ...

Journal: :Plant physiology 2015
Na Sun Meng Liu Wentao Zhang Wanning Yang Xiujuan Bei Hui Ma Fan Qiao Xiaoting Qi

Cadmium (Cd) is highly toxic to plants. Modulation of Cd-responsive transcription is an important way for Cd detoxification in plants. Metal-responsive element (MRE) is originally described in animal metallothionein genes. Although functional MREs also exist in Cd-regulated plant genes, specific transcription factors that bind MRE to regulate Cd tolerance have not been identified. Previously, w...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید