Exchange dynamics of surfactants in adsorption layers investigated by PFG NMR diffusion.

abstract：UNLABELLED:The conventional diagnostic work-up of a patient suspected of having a vascular cause for stridor, or dysphagia, includes esophagography and bronchoscopy to delineate the abnormal structure without imaging the structure itself. Cine-angiography is regarded as the golden standard, but is not routinely perform...

journal_title：Magnetic resonance imaging

authors： Beekman RP,Hazekamp MG,Sobotka MA,Meijboom EJ,de Roos A,Staalman CR,Beek FJ,Ottenkamp J

更新日期：1998-01-01 00:00:00

abstract：AIM:Matrix metalloproteases (MMPs) expression and their inhibitors (TIMPs) play an important role in tumor physiopathology, so we investigated the relationship between the magnetic resonance (MR) and MMPs/TIMPs expression by breast carcinomas. MATERIALS AND METHODS:MRI parameters of 64 breast carcinomas were investiga...

journal_title：Magnetic resonance imaging

authors： Cuadriello EF,Fernández-Guinea Ó,Eiró N,González LO,Junquera S,Vizoso FJ

更新日期：2016-10-01 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：:Fifteen patients with liver cirrhosis and two control groups were examined. The first control group consisted of 7 healthy volunteers, and the second group of 17 patients with nonfocal liver diseases. The T1 and T2 relaxation times were calculated from signal intensities read out from a region of interest centrally lo...

journal_title：Magnetic resonance imaging

authors： Thomsen C,Christoffersen P,Henriksen O,Juhl E

更新日期：1990-01-01 00:00:00

abstract：:Functional MR (fMR) imaging techniques based on blood oxygenation level dependent (BOLD) effects were developed and applied to a rat brain tumor model to evaluate the potential utility of the method for characterizing tumor growth and regression following treatment. Rats bearing 9L brain tumors in situ were imaged dur...

journal_title：Magnetic resonance imaging

authors： Mazurchuk R,Zhou R,Straubinger RM,Chau RI,Grossman Z

更新日期：1999-05-01 00:00:00

abstract：:Arterial spin labeling (ASL) perfusion fMRI data differ in important respects from the more familiar blood oxygen level-dependent (BOLD) fMRI data and require specific processing strategies. In this paper, we examined several factors that may influence ASL data analysis, including data storage bit resolution, motion c...

journal_title：Magnetic resonance imaging

authors： Wang Z,Aguirre GK,Rao H,Wang J,Fernández-Seara MA,Childress AR,Detre JA

更新日期：2008-02-01 00:00:00

abstract：:Articular cartilage thickness is of relevance in various fields in diagnostics and biomedical research. In view of recent improvements of MR cartilage imaging a computational method has been developed for three-dimensional determination of cartilage thickness from tomographic datasets. A correction algorithm that comp...

journal_title：Magnetic resonance imaging

authors： Lösch A,Eckstein F,Haubner M,Englmeier KH

更新日期：1997-01-01 00:00:00

abstract：:In magnetic resonance elastography (MRE), shear waves at a certain frequency are encoded through bipolar gradients that switch polarity at a controlled encoding frequency and are offset in time to capture wave propagation using a controlled sampling frequency. In brain MRE, there is a possibility that the mechanical a...

journal_title：Magnetic resonance imaging

authors： Johnson CL,Chen DD,Olivero WC,Sutton BP,Georgiadis JG

更新日期：2012-02-01 00:00:00

abstract：:The purpose of this study was to test whether an empirical mathematical model (EMM) of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) can distinguish between benign and malignant breast lesions. A modified clinical protocol was used to improve the sampling of contrast medium uptake and washout. T(1)-we...

journal_title：Magnetic resonance imaging

authors： Fan X,Medved M,Karczmar GS,Yang C,Foxley S,Arkani S,Recant W,Zamora MA,Abe H,Newstead GM

更新日期：2007-06-01 00:00:00

abstract：:Resting fluctuations in arterial CO2 (a cerebral vasodilator) are believed to be an important source of low-frequency blood oxygenation level dependent (BOLD) signal fluctuations. In this study we focus on the two commonly used resting-states in functional magnetic resonance imaging experiments, eyes open and eyes clo...

journal_title：Magnetic resonance imaging

authors： Peng T,Niazy R,Payne SJ,Wise RG

更新日期：2013-04-01 00:00:00

abstract：:This work discusses the effect of sampling time on noise, signal-to-noise and contrast-to-noise ratios in magnetic resonance imaging. A simple imaging experiment is performed to demonstrate the effect of sampling time on noise, confirming theoretical expectations that doubling the sampling time while decreasing the re...

journal_title：Magnetic resonance imaging

authors： Hendrick RE

更新日期：1987-01-01 00:00:00

abstract：:A new approach to solid-state imaging (SSI) is presented. The method relies on narrowing the resonance line using the Lee-Goldburg sequence. The technique is easy to implement in practice and may find widespread applications in materials science. ...

journal_title：Magnetic resonance imaging

authors： De Luca F,Lugeri N,De Simone BC,Maraviglia B

更新日期：1992-01-01 00:00:00

abstract：:Current fast imaging techniques are based on gradient echo sequences with reduced flip angle excitation pulses and very short repetition times TR. Practical T2 values may be of the order of TR or longer. In this situation, a different image contrast can be obtained, depending on details of the sequence. Four essential...

journal_title：Magnetic resonance imaging

authors： van der Meulen P,Groen JP,Tinus AM,Bruntink G

更新日期：1988-07-01 00:00:00

abstract：:The goal of this study was to develop and evaluate high-resolution magnetic resonance spectroscopic imaging (MRSI) utilizing the gains in signal-to-noise ratio (SNR) provided by combining higher magnetic field with high-sensitivity phased-array (PA) coils. We investigated the maximum improvement in spatial resolution ...

journal_title：Magnetic resonance imaging

authors： Xu D,Chen AP,Cunningham C,Osorio JA,Nelson SJ,Vigneron DB

更新日期：2006-01-01 00:00:00

abstract：:Ten patients with biopsy-proved synovial sarcoma were evaluated by magnetic resonance (MR) imaging on a 1.5-T unit. The lesions showed intermediate signal intensity on T1-weighted images and heterogeneous high signal intensity on T2-weighted images. Tumors were well-demarcated from normal tissues. Additional informati...

journal_title：Magnetic resonance imaging

authors： Mahajan H,Lorigan JG,Shirkhoda A

更新日期：1989-03-01 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：:Image quality and total scan time in MRI are determined in large part by the trajectory employed to sample the Fourier space. Each trajectory has different properties like coverage of k-space, scan time, sensitivity to off-resonance conditions, etc. These properties are often contradictory, therefore a universal optim...

journal_title：Magnetic resonance imaging

authors： Sabat S,Mir R,Guarini M,Guesalaga A,Irarrazaval P

更新日期：2003-09-01 00:00:00

abstract：:We compared the ability and reproducibility of a fast fluid-attenuated inversion recovery (fast-FLAIR) sequence with and without a magnetization transfer (MT) pulse for detecting and measuring multiple sclerosis (MS)-related abnormalities on magnetic resonance imaging (MRI) scans from 20 patients. The Contrast-to-Nois...

journal_title：Magnetic resonance imaging

authors： Filippi M,Rocca MA,Mastronardo G,Comi G

更新日期：1999-04-01 00:00:00

abstract：:In this paper the effects of reducing the flip angle of the 90-degree observation pulse in inversion recovery imaging are described and analyzed. When incorporated in an IR sequence with a short inversion time (STIR), reduction to the 90-degree pulse allows a significant shortening of the repetition time without loss ...

journal_title：Magnetic resonance imaging

authors： Bakker CJ,Witkamp TD,Janssen WM

更新日期：1991-01-01 00:00:00

abstract：:Magnetic resonance imaging (MRI) and localized proton MR spectroscopy (MRS) techniques have been applied for studying different maturation processes in the histochemistry of coconut (Cocos nucifera). Images of the tender and mature coconut are characterized by protons of the aqueous solution present in the cavity and ...

journal_title：Magnetic resonance imaging

authors： Jagannathan NR,Govindaraju V,Raghunathan P

更新日期：1995-01-01 00:00:00

abstract：:Percentage of lipid content of 22 adrenal cortex lesions and their water proton longitudinal relaxation time were measured in vitro at 60 MHz. Although water relaxation times obtained on benign and malignant samples overlap each other, measurements of the percentage of lipids performed on the same tissues allow us to ...

journal_title：Magnetic resonance imaging

authors： Leroy-Willig A,Roucayrol JC,Luton JP,Courtieu J,Niesenbaum N,Louvel A

更新日期：1987-01-01 00:00:00

abstract：:We report on experiments to characterize internal magnetic field gradients that are caused by magnetic susceptibility differences between the solid phase and the fluids filling the pore space. Our measurements focus on low-field relaxometry of brine and oil in sandstones from various reservoirs around the world. Our r...

journal_title：Magnetic resonance imaging

authors： Appel M,Freeman JJ,Gardner JS,Hirasaki GH,Zhang QG,Shafer JL

更新日期：2001-04-01 00:00:00

abstract：:Tissue contrast obtained using fast spin-echo (FSE) and conventional spin-echo (SE) sequences is not identical and a number of mechanisms are thought to contribute to these contrast differences. The effect of stimulated echoes has previously been apparently ruled out as a contributing mechanism. Signal-to-noise ratios...

journal_title：Magnetic resonance imaging

authors： Williams CF,Redpath TW,Smith FW

更新日期：1996-01-01 00:00:00

abstract：:Magnetic resonance imaging (MRI) has been applied to assess kidney function in normal rats by monitoring the passage of the extracellular contrast agent GdDOTA. High-resolution images have been obtained using either the rapid acquisition with relaxation enhancement (RARE) or the snapshot pulse sequence. The latter was...

journal_title：Magnetic resonance imaging

authors： Baumann D,Rudin M

更新日期：2000-06-01 00:00:00

abstract：:Multi-echo pulse sequences for producing T2-weighted images in much reduced imaging times have recently been developed for routine clinical use. A number of recent articles have described the contrast obtained with fast spin-echo (FSE) sequences and have generally indicated that they depict tissues very similarly to c...

journal_title：Magnetic resonance imaging

authors： Constable RT,Anderson AW,Zhong J,Gore JC

更新日期：1992-01-01 00:00:00

abstract：:Water content is the dominant chemical compound in the brain and it is the primary determinant of tissue contrast in magnetic resonance (MR) images. Water content varies greatly between individuals, and it changes dramatically over time from birth through senescence of the human life span. We hypothesize that the effe...

journal_title：Magnetic resonance imaging

authors： Bansal R,Hao X,Liu F,Xu D,Liu J,Peterson BS

更新日期：2013-12-01 00:00:00

abstract：:Manganese-dipyridoxal diphosphate (Mn-DPDP) is a liver-selective contrast agent selectively taken up by the hepatocytes. Because of the analogy of structure with pyridoxine (vitamin B6), it was previously suggested that this compound can be selectively taken up by the facilitated transport of vitamers B6. To understan...

journal_title：Magnetic resonance imaging

authors： Gallez B,Baudelet C,Adline J,Charbon V,Lambert DM

更新日期：1996-01-01 00:00:00

abstract：OBJECTIVES:The objectives of this study were to develop protocols that measure abdominal fat and calf muscle lipids with magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MRS), respectively, at 3 T and to examine the correlation between these parameters and insulin sensitivity. MATERIALS AND METHOD...

journal_title：Magnetic resonance imaging

authors： Li X,Youngren JF,Hyun B,Sakkas GK,Mulligan K,Majumdar S,Masharani UB,Schambelan M,Goldfine ID

更新日期：2008-02-01 00:00:00

abstract：:In this contribution, we report results from MRI studies of the propagation of heavy metal ions through columns packed with sandy aquifer materials. Both sorption of low concentrations of heavy metal ions from water flowing through the column and the formation of sorption traces produced from initially localized highe...

journal_title：Magnetic resonance imaging

authors： Nestle N,Baumann T,Wunderlich A,Niessner R

更新日期：2003-04-01 00:00:00

abstract：PURPOSE:A direct correlation between T(1ρ), T(2) and quantified proteoglycan and collagen contents in human osteoarthritic cartilage has yet to be documented. We aimed to investigate the orientation effect on T(1ρ) and T(2) values in human osteoarthritic cartilage and to quantify the correlation between T(1ρ), T(2) vs....

journal_title：Magnetic resonance imaging

authors： Li X,Cheng J,Lin K,Saadat E,Bolbos RI,Jobke B,Ries MD,Horvai A,Link TM,Majumdar S

更新日期：2011-04-01 00:00:00