A comparison of readout segmented EPI and interleaved EPI in high-resolution diffusion weighted imaging.

abstract：INTRODUCTION:Pharmacokinetic parameters derived from dynamic contrast-enhanced MRI (DCE-MRI) data are sensitive to acquisition and post-processing techniques, which makes it difficult to compare results obtained using different methods. In particular, one of the most important factors affecting estimation of model para...

journal_title：Magnetic resonance imaging

authors： Wake N,Chandarana H,Rusinek H,Fujimoto K,Moy L,Sodickson DK,Kim SG

更新日期：2018-10-01 00:00:00

abstract：:The aim of this work is to present and evaluate a level-set segmentation approach with vesselness-dependent anisotropic energy weights, which focuses on the exact segmentation of malformed as well as small vessels from time-of-flight (TOF) magnetic resonance angiography (MRA) datasets. In a first step, a vesselness fi...

journal_title：Magnetic resonance imaging

authors： Forkert ND,Schmidt-Richberg A,Fiehler J,Illies T,Möller D,Säring D,Handels H,Ehrhardt J

更新日期：2013-02-01 00:00:00

abstract：:The amplitudes of gradient-echoes produced using static field gradients are sensitive to diffusion of tissue water during the echo evolution time. Gradient-echoes have been used to produce MR images in which image intensity is proportional to the self-diffusion coefficient of water. However, such measurements are subj...

journal_title：Magnetic resonance imaging

authors： Karczmar G,River J,Koretsky AP

更新日期：1995-01-01 00:00:00

abstract：:Fricke-agarose gels have been irradiated with a proton beam. Then samples have been extracted at different depths with respect to the beam penetration distance, corresponding to different irradiation doses. Relaxation times T1 and T2, measured at 17 MHz, appear sensitive to this kind of radiation. In particular, T2 ex...

journal_title：Magnetic resonance imaging

authors： Di Capua S,D'Errico F,Egger E,Guidoni L,Luciani AM,Rosi A,Viti V

更新日期：1997-01-01 00:00:00

abstract：:A parametric multiecho variant of proton spectroscopic imaging (SI) is presented using a multiecho SI sequence with uniform phase-encoding of all echoes within each echo train. The acquisition of SI data sets at different echo times (TE) increases the amount of information obtained within the same total measuring time...

journal_title：Magnetic resonance imaging

authors： Dreher W,Leibfritz D

更新日期：1995-01-01 00:00:00

abstract：:Radial acquisitions can suffer from trajectory errors leading to reduced image quality. Here we present a new method of trajectory correction that uses all spokes of a radial acquisition and compare it to an existing method that uses a two-spoke pre-scan calibration. For both methods, estimates of the necessary shifts...

journal_title：Magnetic resonance imaging

authors： Buonincontri G,Methner C,Krieg T,Carpenter TA,Sawiak SJ

更新日期：2014-09-01 00:00:00

abstract：PURPOSE:This study aims to develop and evaluate a robust conductivity imaging method that combines total variation and wavelet regularization to enhance the accuracy of conductivity maps. THEORY AND METHODS:The proposed approach is based on a gradient-based method. The central equation is derived from Maxwell's equati...

journal_title：Magnetic resonance imaging

authors： Sun X,Lu L,Qi L,Mei Y,Liu X,Chen W

更新日期：2020-06-01 00:00:00

abstract：:Quantifying the intracranial tissue volume changes in magnetic resonance imaging (MRI) assists specialists to analyze the effects of natural or pathological changes. Since these changes can be subtle, the accuracy of the automatic compartmentalization method is always criticized by specialists. We propose and then eva...

journal_title：Magnetic resonance imaging

authors： Azimbagirad M,Simozo FH,Senra Filho ACS,Murta Junior LO

更新日期：2020-01-01 00:00:00

abstract：PURPOSE:The purposes of this study were to (1) correlate the ultrashort echo time (TE) signal intensity of the pointwise encoding time reduction with radial acquisition (PETRA) sequence with that of the ultrashort echo (UTE) sequence using in vivo meniscal ultrashort TE imaging of the knee with a 3-Tesla (3T) clinical ...

journal_title：Magnetic resonance imaging

authors： Lee YH,Suh JS,Grodzki D

更新日期：2016-02-01 00:00:00

abstract：:Retained sponges after laparotomy may cause a broad spectrum of clinical symptoms and present a difficult diagnostic problem. We report a case of retained surgical sponge in a dog to illustrate the MRI findings of this infrequent but important cause of postoperative complications. ...

journal_title：Magnetic resonance imaging

authors： Terrier F,Revel D,Hricak H,Feduska N

更新日期：1985-01-01 00:00:00

abstract：:It has previously been observed that during isometric dorsiflexion exercise, the time course of T2-weighted signal intensity (SI) changes is spatially heterogeneous. The purpose of this study was to test the hypothesis that this spatial heterogeneity would increase at higher contraction intensities. Eight subjects per...

journal_title：Magnetic resonance imaging

authors： Damon BM,Wadington MC,Lansdown DA,Hornberger JL

更新日期：2008-10-01 00:00:00

abstract：:The fluorine nuclear magnetic resonance spin-lattice relaxation rate (1/T1) of the perfluorochemical blood substitute perfluorotripropylamine (FTPA) is very sensitive to oxygen tension. This presents the possibility of measuring blood oxygen tension by 19F MR imaging. We obtained oxygen-sensitive 19F NMR images of the...

journal_title：Magnetic resonance imaging

authors： Fishman JE,Joseph PM,Floyd TF,Mukherji B,Sloviter HA

更新日期：1987-01-01 00:00:00

abstract：PURPOSE:The purpose was to study the effect of estrogen deficiency on contrast agent diffusion into intervertebral disc in a rat model. MATERIALS AND METHODS:Seven-month-old female Sprague-Dawley rats were used. Fourteen rats had ovariectomy, and nine rats had sham surgery. Magnetic resonance imaging (MRI) of sagittal...

journal_title：Magnetic resonance imaging

authors： Deng M,Griffith JF,Zhu XM,Poon WS,Ahuja AT,Wang YX

更新日期：2012-06-01 00:00:00

abstract：:The evaluation of local muscle recruitment during a specific movement can be done indirectly by measuring changes in local blood flow. Intravoxel incoherent motion perfusion imaging exploits some properties of the magnetic resonance to measure locally microvascular perfusion, and seems ideally suited for this task. We...

journal_title：Magnetic resonance imaging

authors： Nguyen A,Ledoux JB,Omoumi P,Becce F,Forget J,Federau C

更新日期：2017-01-01 00:00:00

abstract：:Budd-Chiari syndrome (BCS) is a rare disorder caused by the obstruction of hepatic venous outflow, leading to sinusoidal congestion, ischemic injury to liver cells and portal hypertension. Long-term survival largely depends on whether hepatocellular carcinoma occurs. A recently available liver-specific contrast medium...

journal_title：Magnetic resonance imaging

authors： Kitajima K,Yoshikawa T,Seo Y,Ohno Y,Yano Y,Miki A,Kanda T,Kanata N,Azuma T,Sugimura K

更新日期：2011-05-01 00:00:00

abstract：PURPOSE:To establish an optimized sequence design for fast acceleration of arterial spin labeling (ASL)-based time-resolved magnetic resonance angiography (MRA) by acquisition of control and labeled images in the same shot (fast ACTRESS) and a scan time of <1min, for the evaluation of intracranial vessels. MATERIALS A...

journal_title：Magnetic resonance imaging

authors： Sugimori H,Fujima N,Suzuki Y,Hamaguchi H,Ishizaka K,Kudo K

更新日期：2017-11-01 00:00:00

abstract：BACKGROUND:Ultra-high spatial resolution imaging of whole, ex vivo brains provides new opportunities to understand neurological disease. Recent work has demonstrated that 100 μm isotropic resolution can reveal anatomical details that are otherwise difficult to appreciate, but relied on fabrication facilities, fabricati...

journal_title：Magnetic resonance imaging

authors： Kim S,Sakaie K,Blümcke I,Jones S,Lowe MJ

更新日期：2021-02-01 00:00:00

abstract：:Image artifacts due to 14 gauge radiotherapy electromagnetic (EM) transponders were assessed on conventional spin echo images, and corrected using metal artifact reduction techniques: high bandwidth, view angle tilting (VAT), and slice encoding for metal artifact correction (SEMAC). Large areas of signal loss and/or p...

journal_title：Magnetic resonance imaging

authors： Bergen RV,Ryner L

更新日期：2019-06-01 00:00:00

abstract：:Dysfunction of the corticolimbic circuitry has been highlighted in social anxiety disorder (SAD) during social stimuli. However, few studies have investigated functional connectivity in SAD during the resting state, which may improve our understanding of SAD pathophysiology. The aim of this study was to investigate wh...

journal_title：Magnetic resonance imaging

authors： Ding J,Chen H,Qiu C,Liao W,Warwick JM,Duan X,Zhang W,Gong Q

更新日期：2011-06-01 00:00:00

abstract：:Changes in both blood flow and blood oxygenation determine the functional MRI (fMRI) signal. In the present study factors responsible for blood oxygenation (e.g., FiO(2)) were held constant so that changes in pixel count would above all reflect changes in regional cerebral blood flow (rCBF). Continuous positive airway...

journal_title：Magnetic resonance imaging

authors： Lorenz IH,Kolbitsch C,Hörmann C,Schocke M,Kremser C,Zschiegner F,Felber S,Benzer A

更新日期：2001-01-01 00:00:00

abstract：:Neurovascular coupling describes the cascade between neuronal activity and subsequent Blood-Oxygenation-Level-Dependent (BOLD) signal increase. Based on this premise, the correlation of this BOLD signal increase with a particular task, such as finger-tapping, is used to map neuronal activation. This signal increase ma...

journal_title：Magnetic resonance imaging

authors： van Niftrik CHB,Piccirelli M,Bozinov O,Maldaner N,Strittmatter C,Pangalu A,Valavanis A,Regli L,Fierstra J

更新日期：2018-06-01 00:00:00

abstract：PURPOSE:While PRESS is often employed to measure glutamate concentrations, MEGA-PRESS enables simultaneous Glx (glutamate and glutamine) and GABA measurements. This study aimed to compare validation, repeatability, and concordance of different approaches for glutamate quantification at 3T to aid future studies in their...

journal_title：Magnetic resonance imaging

authors： van Veenendaal TM,Backes WH,van Bussel FCG,Edden RAE,Puts NAJ,Aldenkamp AP,Jansen JFA

更新日期：2018-05-01 00:00:00

abstract：:Balanced steady-state free precession (SSFP) sequences use fully re-focussed gradient waveforms to achieve a high signal and useful image contrast in short scan times. Despite these strengths, the clinical feasibility of balanced SSFP is still limited both by bright fat signal and by the signal voids that result from ...

journal_title：Magnetic resonance imaging

authors： Hargreaves BA,Bangerter NK,Shimakawa A,Vasanawala SS,Brittain JH,Nishimura DG

更新日期：2006-02-01 00:00:00

abstract：:We report the MR appearance of undifferentiated (embryonal) sarcoma of the liver (USL) in a 13-year-old female who presented with a 1-year history of intermittent abdominal pain, weight loss, and fatigue. The tumor was a large, solitary, well-defined focal mass lesion with multiple cystic spaces, septations, and subst...

journal_title：Magnetic resonance imaging

authors： Psatha EA,Semelka RC,Fordham L,Firat Z,Woosley JT

更新日期：2004-07-01 00:00:00

abstract：:Radio frequency magnetic fields from 5 to 100 kHz off resonance reduce longitudinal magnetization of water in some tissues without affecting the magnetization of simple solutions (Wolff, S.D.; Balaban, R.S. Magnetization transfer contrast (MTC) and tissue water proton relaxation in vivo. Magn. Reson. Med. 10:135-144; ...

journal_title：Magnetic resonance imaging

authors： Dixon WT,Engels H,Castillo M,Sardashti M

更新日期：1990-01-01 00:00:00

abstract：:Etched particle tracks produced after heavy ion irradiation of polymer foils are used as model systems to test the performance of NMR in a newly developed ultrahigh magnetic field gradient system. The stimulated NMR echo decay of molecules diffusing in the channels, formulated in terms of the self part of the intermed...

journal_title：Magnetic resonance imaging

authors： Fujara F,Ilyina E,Nienstaedt H,Sillescu H,Spohr R,Trautmann C

更新日期：1994-01-01 00:00:00

abstract：:Gd-DOTA contrast enhancement of MR images was evaluated on induced mammary tumors in female rats. A single intravenous injection of the carcinogenic N-nitrosourea ENU was administered to Wistar rats; this simple treatment led to a high percentage of mammary tumors without causing death. All the induced tumors were ade...

journal_title：Magnetic resonance imaging

authors： Bonnet PA,Michel A,Fernandez JP,Cyteval C,Rifai A,Boucard M,Chapat JP,Lamarque JL

更新日期：1990-01-01 00:00:00

abstract：:The general aims of functional brain magnetic resonance imaging (fMRI) studies are to ascertain which areas of the brain are activated during a specific task, the extent of this activation, whether different groups of subjects demonstrate different patterns of activation, and how these groups behave in different tasks...

journal_title：Magnetic resonance imaging

authors： Constable RT,Skudlarski P,Mencl E,Pugh KR,Fulbright RK,Lacadie C,Shaywitz SE,Shaywitz BA

更新日期：1998-04-01 00:00:00

abstract：:In independent component analysis (ICA), principal component analysis (PCA) is generally used to reduce the raw data to a few principal components (PCs) through eigenvector decomposition (EVD) on the data covariance matrix. Although this works for spatial ICA (sICA) on moderately sized fMRI data, it is intractable for...

journal_title：Magnetic resonance imaging

authors： Wang Z,Wang J,Calhoun V,Rao H,Detre JA,Childress AR

更新日期：2006-06-01 00:00:00

abstract：:Rapid maturational brain changes occur during adolescence--a time associated with risk-taking behaviors and improvements in cognition. The present study examined the relationship between white matter (WM) microstructure, impulsive behavior and response inhibition in female and male adolescents. Twenty-one healthy adol...

journal_title：Magnetic resonance imaging

authors： Silveri MM,Rohan ML,Pimentel PJ,Gruber SA,Rosso IM,Yurgelun-Todd DA

更新日期：2006-09-01 00:00:00