Characterisation of wetting heterogeneities in sandstone rocks by MRI.

abstract：:We determined whether the accuracy of magnetic resonance angiography (MRA) in the peripheral run-off vessels can be improved by using contrast-enhanced (CE) three-dimensional (3D) technique in comparison to electrocardiograph (ECG)-triggered two-dimensional (2D) time-of-flight (TOF) technique. In a prospective study 2...

journal_title：Magnetic resonance imaging

authors： Vosshenrich R,Kopka L,Castillo E,Böttcher U,Graessner J,Grabbe E

更新日期：1998-10-01 00:00:00

abstract：:The purpose of this study was to demonstrate the initial results of the dynamic contrast-enhanced MRA in under four seconds in the assessment of anomalous pulmonary circulation. We performed dynamic contrast enhanced MRA on ten patients with a temporal resolution of 2-3 sec for each phase. Five patients had pulmonary ...

journal_title：Magnetic resonance imaging

authors： Balci NC,Yalçin Y,Tunaci A,Balci Y

更新日期：2003-01-01 00:00:00

abstract：PURPOSE:To perform comprehensive in vitro experiments using six-directional icosahedral flow encoding (ICOSA6) 4D flow magnetic resonance imaging (MRI) under various scan conditions to analyze the robustness of velocity and turbulence quantification. MATERIALS AND METHODS:In vitro flow phantoms with steady flow rates ...

journal_title：Magnetic resonance imaging

authors： Ha H,Park KJ,Dyverfeldt P,Ebbers T,Yang DH

更新日期：2020-10-01 00:00:00

abstract：:We used magnetic resonance imaging (MRI) and water-suppressed proton MR spectroscopic imaging (1H MRSI) to study the effects of human immunodeficiency virus (HIV) infection on the brain. Our recent in vivo finding of lower N-acetylaspartate (NAA), a putative marker of neurons, in the supraventricular brain of cognitiv...

journal_title：Magnetic resonance imaging

authors： Meyerhoff DJ,MacKay S,Poole N,Dillon WP,Weiner MW,Fein G

更新日期：1994-01-01 00:00:00

abstract：:An inductively coupled surface coil for imaging the rat spine at 7 T is described. This planar circular probe was made from microwave substrate to limit the size of the coil and to minimize the magnetic susceptibility. The surface coil was used as a single transmit/receive coil and as a receive-only coil with a birdca...

journal_title：Magnetic resonance imaging

authors： Banson ML,Cofer GP,Hedlund LW,Johnson GA

更新日期：1992-01-01 00:00:00

abstract：:In recent years there has been increasing interest in applying magnetic resonance (MR) techniques in areas of engineering and chemical technology. The science that underpins many of these applications is the physics and chemistry of transport and reaction processes in porous materials. Key to the exploitation of MR me...

journal_title：Magnetic resonance imaging

authors： Gladden LF,Alexander P,Britton MM,Mantle MD,Sederman AJ,Yuen EH

更新日期：2003-04-01 00:00:00

abstract：:The effects of motion in two-dimensional Fourier transform imaging (2DFT) are considered. Specific calculations describing the case of periodic motion are presented. The results predict the commonly seen artifact of image replication, sometimes referred to as ghosting. Expressions for both position and amplitude of th...

journal_title：Magnetic resonance imaging

authors： Haacke EM,Patrick JL

更新日期：1986-01-01 00:00:00

abstract：:High signal-to-noise ratios (SNR) are essential for high-resolution anatomical and functional MRI. Phased arrays are advantageous for this but have the drawback that they often have inflexible and bulky configurations. Particularly in experiments where functional MRI is combined with simultaneous electrophysiology, sp...

journal_title：Magnetic resonance imaging

authors： Goense J,Logothetis NK,Merkle H

更新日期：2010-10-01 00:00:00

abstract：:Diffusion tensor imaging (DTI) is potentially sensitive to collagen degeneration in cartilage. In this study, DTI was measured on human cartilage samples with interventions of trypsin and collagenase. The measured preferred diffusion direction was consistent with the zonal structure of collagen network. The glycosamin...

journal_title：Magnetic resonance imaging

authors： Deng X,Farley M,Nieminen MT,Gray M,Burstein D

更新日期：2007-02-01 00:00:00

abstract：:The purpose of this study is to estimate the precision or statistical variability of the velocity measurements computed from MRI phase-contrast. From the analytical probability density function (PDF) of the phase in the signal we obtain the PDF of the velocity by means of an auto-convolution. This PDF allows the estim...

journal_title：Magnetic resonance imaging

authors： Irarrazaval P,Dehghan Firoozabadi A,Uribe S,Tejos C,Sing-Long C

更新日期：2019-11-01 00:00:00

abstract：:Surface magnetic relaxation in porous media is usually attributed to hindered rotation or to paramagnetic impurities on the surface. In cement pastes, however, it seems reasonable to attribute surface relaxation to dipole interactions in water adsorbed as water of hydration on grain surfaces. The rate limiting factor ...

journal_title：Magnetic resonance imaging

authors： Mendelson KS,Halperin WP,Jehng JY,Song YQ

更新日期：1994-01-01 00:00:00

abstract：:With the aim of developing a fast algorithm for high-quality MRI reconstruction from undersampled k-space data, we propose a novel deep neural Network, which is inspired by Iterative Shrinkage Thresholding Algorithm with Data consistency (NISTAD). NISTAD consists of three consecutive blocks: an encoding block, which m...

journal_title：Magnetic resonance imaging

authors： Qiu W,Li D,Jin X,Liu F,Sun B

更新日期：2020-07-01 00:00:00

abstract：:The fast Fourier flow technique offers a convenient way for extremely exact flow measurements. In combination with ECG gating, arterial flow can be studied. The total acquisition time for a single measurement is about 10 s, an ECG-gated cine sequence can be acquired in about 4 min. Fast Fourier flow can, therefore, be...

journal_title：Magnetic resonance imaging

authors： Hennig J,Mueri M,Brunner P,Friedburg H

更新日期：1988-07-01 00:00:00

abstract：:Idiopathic dilatation of the pulmonary artery (IDPA) is a rare congenital disease which is usually detected fortuitously on chest x-ray, thus radiologists must be aware of this clinical entity. This report describes four cases to which Magnetic Resonance Imaging (MRI) played a major role in diagnosing IDPA and in dete...

journal_title：Magnetic resonance imaging

authors： Ugolini P,Mousseaux E,Sadou Y,Sidi D,Mercier LA,Paquet E,Gaux JC

更新日期：1999-07-01 00:00:00

abstract：:We report initial NMR studies of continuous flow laser-polarized xenon gas, both in unrestricted tubing, and in a model porous media. The study uses Pulsed Gradient Spin Echo-based techniques in the gas-phase, with the aim of obtaining more sophisticated information than just translational self-diffusion coefficients....

journal_title：Magnetic resonance imaging

authors： Mair RW,Wang R,Rosen MS,Candela D,Cory DG,Walsworth RL

更新日期：2003-04-01 00:00:00

abstract：:Signal fluctuations in functional magnetic resonance imaging (fMRI) can result from a number of sources that may have a neuronal, physiologic or instrumental origin. To determine the relative contribution of these sources, we recorded physiological (respiration and cardiac) signals simultaneously with fMRI in human vo...

journal_title：Magnetic resonance imaging

authors： Bianciardi M,Fukunaga M,van Gelderen P,Horovitz SG,de Zwart JA,Shmueli K,Duyn JH

更新日期：2009-10-01 00:00:00

abstract：:In the present work, we reported a new nuclear Overhauser enhancement (NOE)-mediated magnetization transfer (MT) signal at around -1.6ppm (NOE(-1.6)) in rat brain and investigated its application in the detection of acute ischemic stroke in rodent model. Using continuous wave (CW) MT sequence, the NOE(-1.6) is reliabl...

journal_title：Magnetic resonance imaging

authors： Zhang XY,Wang F,Afzal A,Xu J,Gore JC,Gochberg DF,Zu Z

更新日期：2016-10-01 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：:Perfusion magnetic resonance imaging (MRI) is a promising non-invasive technique providing insights regarding the brain's microvascular architecture in vivo. The scalar perfusion metrics can be used for quantitative diagnostics of various brain abnormalities, in particular, in the stroke cases and tumours. However, co...

journal_title：Magnetic resonance imaging

authors： Maximov II,Vellmer S

更新日期：2019-04-01 00:00:00

abstract：:NMR offers, in the complex proton relaxation properties of biological tissues, a unique and potentially powerful tool of tissue characterization. The difficulties encountered so far in comparing the results of in vitro and in vivo NMR studies carried out in different laboratories inhibit NMR methodologies from fully e...

journal_title：Magnetic resonance imaging

authors： Podo F,Orr JS,Schmidt KH,Bovée WM

更新日期：1988-03-01 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：PURPOSE:To identify quantitative dynamic contrast-enhanced (DCE)-MRI perfusion parameters indicating tumor response of hepatocellular carcinoma (HCC) to transarterial chemoembolization (TACE). MATERIALS AND METHODS:This prospective pilot study was approved by our institutional review board; written and informed consen...

journal_title：Magnetic resonance imaging

authors： Thibodeau-Antonacci A,Petitclerc L,Gilbert G,Bilodeau L,Olivié D,Cerny M,Castel H,Turcotte S,Huet C,Perreault P,Soulez G,Chagnon M,Kadoury S,Tang A

更新日期：2019-10-01 00:00:00

abstract：:Qualitative and quantitative proton magnetic resonance imaging techniques were applied to persimmon (Diospyros kaki cv 'Fuyu') fruit during development and post-harvest ripening. Spin-lattice (T(1)) relaxation times in mesocarp parenchyma and vascular tissue exhibited a sigmoidal pattern of increase leading to commerc...

journal_title：Magnetic resonance imaging

authors： Clark CJ,MacFall JS

更新日期：2003-07-01 00:00:00

abstract：:This work addresses the special problems of measuring flow velocity distributions in rock by NMR methods. Specifically, these problems are to measure very slow flows as well as flows in the presence of background magnetic field gradients caused by heterogeneities of the rock. We modify a stimulated echo sequence for u...

journal_title：Magnetic resonance imaging

authors： Waggoner RA,Fukushima E

更新日期：1996-01-01 00:00:00

abstract：:Lipomatous tumors of the uterus are unusual, benign neoplasms seen in postmenopausal women. Although many of the mixed-type cases such as lipoleiomyoma and fibrolipoma have been reported, pure uterine lipomas are extremely rare. In the literature, a few cases with pure uterine lipoma have been reported. We first prese...

journal_title：Magnetic resonance imaging

authors： Erdem G,Celik O,Karakas HM,Alkan A,Hascalik S

更新日期：2007-10-01 00:00:00

abstract：PURPOSE:The purpose of this study was to assess relationships between intramuscular adipose tissue (IntraMAT) content determined by MRI and intramyocellular lipids (IMCL) and extramyocellular lipids (EMCL) determined by (1)H magnetic resonance spectroscopy ((1)H MRS) or echo intensity determined by B-mode ultrasonograp...

journal_title：Magnetic resonance imaging

authors： Akima H,Hioki M,Yoshiko A,Koike T,Sakakibara H,Takahashi H,Oshida Y

更新日期：2016-05-01 00:00:00

abstract：:The advantages of event-related functional Magnetic Resonance Imaging (fMRI) and the increasing use of fMRI in cognitive experiments are both driving the development of techniques that allow images sensitive to the blood oxygen level-dependent effect to be acquired at ever-higher temporal resolution. Here, we present ...

journal_title：Magnetic resonance imaging

authors： Gibson A,Peters AM,Bowtell R

更新日期：2006-05-01 00:00:00

abstract：:Left ventricle (LV) segmentation plays an important role in the diagnosis of cardiovascular diseases. The cardiac contractile function can be quantified by measuring the segmentation results of LVs. Fully convolutional networks (FCNs) have been proven to be able to segment images. However, a large number of annotated ...

journal_title：Magnetic resonance imaging

authors： Lin A,Wu J,Yang X

更新日期：2020-02-01 00:00:00

abstract：:1H Magnetic resonance imaging and 31P magnetic resonance spectroscopy (MRS) have been carried out in experimental rodent filariasis, i.e., Acanthocheilonema viteae infection in the rodent host, Mastomys coucha. The T2-weighted image of the infected host shows fine hyperintense thread like structures of adult filariid ...

journal_title：Magnetic resonance imaging

authors： Shukla-Dave A,Fatma N,Roy R,Srivastava S,Chatterjee RK,Govindaraju V,Viswanathan AK,Raghunathan P

更新日期：1997-01-01 00:00:00

abstract：PURPOSE:Visual review of individual spectra in magnetic resonance spectroscopic imaging (MRSI) data benefits from the application of spectral smoothing; however, if this processing step is applied prior to spectral analysis this can impact the accuracy of the quantitation. This study aims to analyze the effect of spect...

journal_title：Magnetic resonance imaging

authors： Goryawala M,Sullivan M,Maudsley AA

更新日期：2020-07-01 00:00:00