Localized imaging using stimulated echoes.

abstract：:Comparative NMR studies of normal and pathologically altered human stomach tissues were performed on the basis of proton T1 relaxation time measurements in the presence of high external concentrations of relaxation (contrast) agents manganese ethylenediaminetetraacetic acid (Mn-EDTA) and gadolinium diethylenetriaminep...

journal_title：Magnetic resonance in medicine

authors： Srejić R,Popov DV,Boricić I,Zuvela M

更新日期：1990-09-01 00:00:00

abstract：:Whole-body NMR imaging antennas (probes) are strongly affected by the inevitable magnetic and controllable dielectric losses. Using a convenient parallelepiped model, the magnetic losses are evaluated. By introducing the "ideal power gain," the best possible antenna performance is delimited as a function of the freque...

journal_title：Magnetic resonance in medicine

authors： Sergiadis G

更新日期：1985-08-01 00:00:00

abstract：PURPOSE:Head motion continues to be a major source of artifacts and data quality degradation in MRI. The goal of this work was to develop and demonstrate a novel technique for prospective, 6 degrees of freedom (6DOF) rigid body motion estimation and real-time motion correction using inductively coupled wireless nuclear...

journal_title：Magnetic resonance in medicine

authors： Sengupta S,Tadanki S,Gore JC,Welch EB

更新日期：2014-10-01 00:00:00

abstract：:An effective shield for the dc fringing fields produced by a large-bore, high field magnet intended for imaging and in vivo spectroscopy is presented. While limiting the extent of fringe fields, the shield has little effect on the homogeneity of the central field of the magnet. The effect of institutional safety polic...

journal_title：Magnetic resonance in medicine

authors： Ewing JR,Timms W,Williams JE,Welch KM

更新日期：1985-10-01 00:00:00

abstract：:Two-dimensional T2-selective proton imaging of human head has been performed at 10 MHz employing Carr-Purcell-Gill-Meiboom pulse trains with echo separation of 6 and 12 msec. Using the information of 36 spin echoes and applying a recovery time of 2 sec the magnetization decay has been traced. The multi-exponential T2 ...

journal_title：Magnetic resonance in medicine

authors： Gersonde K,Felsberg L,Tolxdorff T,Ratzel D,Ströbel B

更新日期：1984-12-01 00:00:00

abstract：:Focused ultrasound heating of ex vivo bovine kidney and liver was monitored using magnetic resonance imaging (MRI) to investigate the quantitative relationship between time-dependent temperature elevations and altered contrast in MR images due to thermal coagulation. Proton resonance frequency shift MR thermometry was...

journal_title：Magnetic resonance in medicine

authors： Graham SJ,Chen L,Leitch M,Peters RD,Bronskill MJ,Foster FS,Henkelman RM,Plewes DB

更新日期：1999-02-01 00:00:00

abstract：:This study characterizes gains in sensitivity and spectral resolution of proton echo-planar spectroscopic imaging (PEPSI) with increasing magnetic field strength (B(0)). Signal-to-noise ratio (SNR) per unit volume and unit time, and intrinsic linewidth (LW) of N-acetyl-aspartate (NAA), creatine (Cr), and choline (Cho)...

journal_title：Magnetic resonance in medicine

authors： Otazo R,Mueller B,Ugurbil K,Wald L,Posse S

更新日期：2006-12-01 00:00:00

abstract：PURPOSE:MRI-guided high intensity focused ultrasound (MR-HIFU) allows noninvasive heating of deep tissues. Specifically targeting visceral fat deposits with MR-HIFU could offer an effective therapy for reversing the development of obesity, diabetes, and metabolic syndrome. METHODS:Overweight rats received either MR-HI...

journal_title：Magnetic resonance in medicine

authors： Winter PM,Lanier M,Partanen A,Dumoulin C

更新日期：2016-07-01 00:00:00

abstract：:A technique for noninvasively quantifying the concentration of sodium ((23) Na) ions was applied to the study of ischemic stroke. (23) Na-magnetic resonance imaging techniques have shown considerable potential for measuring subtle changes in ischemic tissue, although studies to date have suffered primarily from poor s...

journal_title：Magnetic resonance in medicine

authors： Wetterling F,Gallagher L,Macrae IM,Junge S,Fagan AJ

更新日期：2012-03-01 00:00:00

abstract：PURPOSE:Spiral readouts combine several favorable properties that promise superior net sensitivity for diffusion imaging. The purpose of this study is to verify the signal-to-noise ratio (SNR) benefit of spiral acquisition in comparison with current echo-planar imaging (EPI) schemes. METHODS:Diffusion-weighted in vivo...

journal_title：Magnetic resonance in medicine

authors： Lee Y,Wilm BJ,Brunner DO,Gross S,Schmid T,Nagy Z,Pruessmann KP

更新日期：2021-04-01 00:00:00

abstract：PURPOSE:To develop a prospective baseline enhancement that compensates for intermingled background effects in Z-spectra to achieve sensitivity enhancement of peaks related to CEST and nuclear Overhauser effect. METHODS:An MRI sequence-specific compensation of background effects is achieved through variation of the pul...

journal_title：Magnetic resonance in medicine

authors： Lenich T,Pampel A,Mildner T,Möller HE

更新日期：2019-04-01 00:00:00

abstract：PURPOSE:Gradient imperfections remain a challenge in MRI, especially for sequences relying on long imaging readouts. This work aims to explore image reconstruction based on k-space trajectories predicted by an impulse response model of the gradient system. THEORY AND METHODS:Gradient characterization was performed twi...

journal_title：Magnetic resonance in medicine

authors： Vannesjo SJ,Graedel NN,Kasper L,Gross S,Busch J,Haeberlin M,Barmet C,Pruessmann KP

更新日期：2016-07-01 00:00:00

abstract：:The investigation of flow behavior in coronary arteries is of great importance for an understanding of heart failure and heart regulation mechanisms. The purpose of the present study was to demonstrate that flow velocity can be quantified in the coronary arteries of the isolated rat heart with high-resolution phase co...

journal_title：Magnetic resonance in medicine

authors： Köhler S,Hiller KH,Jakob PM,Bauer WR,Haase A

更新日期：2003-09-01 00:00:00

abstract：:Skeletal muscle triglycerides are markers for insulin resistance in type 2 diabetes. Recently, MR spectroscopy was adapted for in vivo measurement of triglycerides in animal models and for the characterization of new therapeutic approaches. Because of small MR spectroscopy voxel sizes used in skeletal muscles, surface...

journal_title：Magnetic resonance in medicine

authors： Neumaier M,Niessen HG,Kaulisch T,Stiller D

更新日期：2009-10-01 00:00:00

abstract：:The incoherent displacement of water in living tissues is of considerable interest because of the widespread use of diffusion-weighted MRI, for which image contrast is based on the water apparent diffusion coefficient (ADC). It has been hypothesized that the decrease in water ADC associated with brain injury is primar...

journal_title：Magnetic resonance in medicine

authors： Sehy JV,Ackerman JJ,Neil JJ

更新日期：2002-07-01 00:00:00

abstract：:Three-dimensional magnetization-prepared (MP) MR angiography (MRA) was applied to the carotid and vertebral arteries by using ECG triggering, a slab selective RF inversion pulse, centric phase encoding and acquisition during diastole. Both theoretically and experimentally, the MP MRA sequence was shown to perform well...

journal_title：Magnetic resonance in medicine

authors： Wilman AH,Huston J 3rd,Riederer SJ

更新日期：1997-02-01 00:00:00

abstract：:For perfusion-based functional magnetic resonance imaging, the previously introduced flow-sensitive alternating inversion recovery (FAIR) technique is combined with single-shot RARE (rapid acquisition with relaxation enhancement) and GRASE (gradient and spin echo) imaging sequences. The advantages of these sequences c...

journal_title：Magnetic resonance in medicine

authors： Crelier GR,Hoge RD,Munger P,Pike GB

更新日期：1999-01-01 00:00:00

abstract：:Genetically engineered mouse models provide enormous potential for investigation of the underlying mechanisms of atherosclerotic disease, but noninvasive imaging methods for analysis of atherosclerosis in mice are currently limited. This study aimed to demonstrate the feasibility of MRI to noninvasively visualize athe...

journal_title：Magnetic resonance in medicine

authors： Wiesmann F,Szimtenings M,Frydrychowicz A,Illinger R,Hunecke A,Rommel E,Neubauer S,Haase A

更新日期：2003-07-01 00:00:00

abstract：:An automatic fMRI protocol for the investigation of the human auditory cortex has been developed. For the activation of the auditory system, the scanner noise itself is the source of sound. Rapid switching of B0 gradients allows the generation of tones of defined frequencies and amplitude on a conventional scanner wit...

journal_title：Magnetic resonance in medicine

authors： Bilecen D,Radü EW,Scheffler K

更新日期：1998-12-01 00:00:00

abstract：PURPOSE:To design, construct, and evaluate quantitative MR phantoms that mimic MRI signals from the liver with simultaneous control of three parameters: proton-density fat fraction (PDFF), R 2 ∗ ...

journal_title：Magnetic resonance in medicine

authors： Zhao R,Hamilton G,Brittain JH,Reeder SB,Hernando D

更新日期：2021-02-01 00:00:00

abstract：:Assuming that the SSFP magnetization response maintains a steady state which is periodic in the presence of diffusion, we can solve for the diffusion effect in such sequences. Formulating a Fourier series decomposition solution to the Bloch-Torrey equation and imposing the steady-state condition, analytical expression...

journal_title：Magnetic resonance in medicine

authors： Carney CE,Wong ST,Patz S

更新日期：1991-06-01 00:00:00

abstract：:The pulse wave velocity (PWV) of aortic blood flow is considered a surrogate for aortic compliance. A new method using phase-contrast (PC)-MRI is presented whereby the spatial and temporal profiles of axial velocity along the descending aorta can be analyzed. Seventeen young healthy volunteers (the YH group), six olde...

journal_title：Magnetic resonance in medicine

authors： Yu HY,Peng HH,Wang JL,Wen CY,Tseng WY

更新日期：2006-10-01 00:00:00

abstract：PURPOSE:To develop a method that fits a multipool model to z-spectra acquired from non-steady state sequences, taking into account the effects of variations in T1 or B1 amplitude and the results estimating the parameters for a four-pool model to describe the z-spectrum from the healthy brain. METHODS:We compared measu...

journal_title：Magnetic resonance in medicine

authors： Geades N,Hunt BAE,Shah SM,Peters A,Mougin OE,Gowland PA

更新日期：2017-08-01 00:00:00

abstract：PURPOSE:To characterize the q-space truncation and sampling on the spin-displacement probability density function (PDF) in diffusion spectrum imaging (DSI). METHODS:DSI data were acquired using the MGH-USC connectome scanner (Gmax  = 300 mT/m) with bmax  = 30,000 s/mm2 , 17 × 17 × 17, 15 × 15 × 15 and 11 × 11 × 11 gri...

journal_title：Magnetic resonance in medicine

authors： Tian Q,Rokem A,Folkerth RD,Nummenmaa A,Fan Q,Edlow BL,McNab JA

更新日期：2016-12-01 00:00:00

abstract：PURPOSE:Myocardial effective relaxation time T2* is commonly regarded as a surrogate for myocardial tissue oxygenation. However, it is legitimate to assume that there are multiple factors that influence T2*. To this end, this study investigates the relationship between T2* and cardiac macromorphology given by left vent...

journal_title：Magnetic resonance in medicine

authors： Huelnhagen T,Hezel F,Serradas Duarte T,Pohlmann A,Oezerdem C,Flemming B,Seeliger E,Prothmann M,Schulz-Menger J,Niendorf T

更新日期：2017-06-01 00:00:00

abstract：:The dependence of 1/T1 on the magnetic field strength (the relaxation dispersion) has been measured at 37 degrees C on autopsy samples of human brain gray and white matter at field strengths corresponding to proton Larmor frequencies between 10 kHz and 50 MHz (0.0002-1.2 T). Additional measurements of 1/T1 and 1/T2 ha...

journal_title：Magnetic resonance in medicine

authors： Fischer HW,Rinck PA,Van Haverbeke Y,Muller RN

更新日期：1990-11-01 00:00:00

abstract：:We have obtained high-field (11.7 Tesla), high-resolution carbon-13 solid-state "magic-angle" sample-spinning nuclear magnetic resonance (NMR) spectra of a variety of phospholipids, sphingolipids, myelin and white matter samples, resolving and assigning over 40 resonances in the spectra of human and bovine myelin. The...

journal_title：Magnetic resonance in medicine

authors： Husted C,Montez B,Le C,Moscarello MA,Oldfield E

更新日期：1993-02-01 00:00:00

abstract：:SENSitivity Encoding (SENSE) greatly enhances the quality of diffusion-weighted echo-planar imaging (EPI) by reducing blurring and off-resonance artifacts. Such improvement would also be desirable for diffusion tensor imaging (DTI), but measures derived from the diffusion tensor can be extremely sensitive to any kind ...

journal_title：Magnetic resonance in medicine

authors： Bammer R,Auer M,Keeling SL,Augustin M,Stables LA,Prokesch RW,Stollberger R,Moseley ME,Fazekas F

更新日期：2002-07-01 00:00:00

abstract：:The harmonic phase (HARP) method provides automatic and rapid analysis of tagged magnetic resonance (MR) images for quantification and visualization of myocardial strain. In this article, the development and implementation of a pulse sequence that acquires HARP images in real time are described. In this pulse sequence...

journal_title：Magnetic resonance in medicine

authors： Sampath S,Derbyshire JA,Atalar E,Osman NF,Prince JL

更新日期：2003-07-01 00:00:00

abstract：PURPOSE:Diffusion magnetic resonance imaging (MRI) microstructure imaging provides a unique noninvasive probe into tissue microstructure. The technique relies on biophysically motivated mathematical models, relating microscopic tissue features to the magnetic resonance (MR) signal. This work aims to determine which com...

journal_title：Magnetic resonance in medicine

authors： Ferizi U,Schneider T,Panagiotaki E,Nedjati-Gilani G,Zhang H,Wheeler-Kingshott CA,Alexander DC

更新日期：2014-12-01 00:00:00