Characterisation of crosslinked elastomeric materials by 1H NMR relaxation time distributions.

abstract：:Cells labeled by super paramagnetic iron-oxide (SPIO) nanoparticles are more easily seen in gradient echo MR images, but it has not been shown that the amount of nanoparticles or the number of cells can be directly quantified from MR images. This work utilizes a previously developed and improved Complex Image Summatio...

journal_title：Magnetic resonance imaging

authors： Kokeny P,Cheng YN,Liu S,Xie H,Jiang Q

更新日期：2017-01-01 00:00:00

abstract：:Recently, we have demonstrated that the fine-digit topography (millimeter sized) previously identified in the primary somatosensory cortex (SI), using electrophysiology and intrinsic signal optical imaging, can also be mapped with submillimeter resolution using blood-oxygenation-level-dependent (BOLD) functional magne...

journal_title：Magnetic resonance imaging

authors： Zhang N,Gore JC,Chen LM,Avison MJ

更新日期：2007-07-01 00:00:00

abstract：:Functional magnetic resonance imaging favors the use of multi-slice gradient-recalled echo-planar imaging due to its short image acquisition times, whole brain coverage and sensitivity to BOLD contrast. However, despite its advantages, gradient-recalled echo-planar imaging also is sensitive to static magnetic field gr...

journal_title：Magnetic resonance imaging

authors： Cordes D,Turski PA,Sorenson JA

更新日期：2000-11-01 00:00:00

abstract：:Quantification of magnetic resonance (MR)-based relaxation parameters of tendons and ligaments is challenging due to their very short transverse relaxation times, requiring application of ultra-short echo-time (UTE) imaging sequences. We quantify both T1 and T2* in the quadriceps and patellar tendons of healthy volunt...

journal_title：Magnetic resonance imaging

authors： Krämer M,Maggioni MB,Brisson NM,Zachow S,Teichgräber U,Duda GN,Reichenbach JR

更新日期：2019-11-01 00:00:00

abstract：:Autofocusing is a postprocessing technique for motion correction, which optimizes an image quality metric against various trial motions. In this work, image metric maps, which are measures of image quality plotted as a function of in-plane 2-D trial translations, are systematically studied to develop improved autofocu...

journal_title：Magnetic resonance imaging

authors： Lin W,Song HK

更新日期：2006-07-01 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：:The performance evaluation of a semi-supervised fuzzy c-means (SFCM) clustering method for monitoring brain tumor volume changes during the course of routine clinical radiation-therapeutic and chemo-therapeutic regimens is presented. The tumor volume determined using the SFCM method was compared with the volume estima...

journal_title：Magnetic resonance imaging

authors： Vaidyanathan M,Clarke LP,Hall LO,Heidtman C,Velthuizen R,Gosche K,Phuphanich S,Wagner H,Greenberg H,Silbiger ML

更新日期：1997-01-01 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：:The CNS involvement is frequently found in human immunodeficiency virus (HIV) infection. The purpose of our study was to determine whether proton magnetic resonance spectroscopy (MRS) could detect early brain involvement in neurologically asymptomatic HIV-infected patients with normal MR imagings and to find the corre...

journal_title：Magnetic resonance imaging

authors： Suwanwelaa N,Phanuphak P,Phanthumchinda K,Suwanwela NC,Tantivatana J,Ruxrungtham K,Suttipan J,Wangsuphachart S,Hanvanich M

更新日期：2000-09-01 00:00:00

abstract：:MRI is applied to the visualisation of wetting heterogeneities evidenced by water proton T1 contrast at 0.1 T. Water saturated Fontainebleau sandstone samples were examined either in their original water-wet condition, or after silanation. T1, T2Hahn, and T2CPMG were measured for several porosities. T1 and T2CPMG of h...

journal_title：Magnetic resonance imaging

authors： Guillot G,Chardaire-Rivière C,Bobroff S,Le Roux A,Roussel JC,Cuiec L

更新日期：1994-01-01 00:00:00

abstract：:Deep brain stimulation (DBS) is used increasingly in the field of movement disorders. The implanted electrodes create not only a prior risk to patient safety during MRI, but also a unique opportunity in the collection of functional MRI data conditioned by direct neural stimulation. We evaluated MRI-related heating for...

journal_title：Magnetic resonance imaging

authors： Bhidayasiri R,Bronstein JM,Sinha S,Krahl SE,Ahn S,Behnke EJ,Cohen MS,Frysinger R,Shellock FG

更新日期：2005-05-01 00:00:00

abstract：:The polysplenia syndrome is the association of multiple spleens, situs inversus, congenital heart disease, and azygous continuation of the inferior vena cava. Magnetic resonance (MR) is a noninvasive imaging modality which can easily confirm the multiplicity of spleens, situs inversus, and identify complex congenital ...

journal_title：Magnetic resonance imaging

authors： Jelinek JS,Stuart PL,Done SL,Ghaed N,Rudd SA

更新日期：1989-11-01 00:00:00

abstract：:Many algorithms have been proposed for automated segmentation of white matter hyperintensities (WMH) in brain MRI. Yet, broad uptake of any particular algorithm has not been observed. In this work, we argue that this may be due to variable and suboptimal validation data and frameworks, precluding direct comparison of ...

journal_title：Magnetic resonance imaging

authors： Knight J,Taylor GW,Khademi A

更新日期：2018-12-01 00:00:00

abstract：:In-plane flow quantification in MRI offers the potential for assessing vessel patency, and both volume flow rate and flow velocity. These techniques will have definite future impact on MR angiography. The method used in this paper employs motion artifact suppression technique (MAST) gradients to refocus spins travelli...

journal_title：Magnetic resonance imaging

authors： Duerk JL,Pattany PM

更新日期：1988-05-01 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 investigate right ventricular (RV) strain in patients without identified cardiac pathology using cardiac magnetic resonance tissue tracking (CMR TT). METHODS:A total of 50 consecutive patients with no identified cardiac pathology were analyzed. RV longitudinal and circumferential strain was assessed by CMR ...

journal_title：Magnetic resonance imaging

authors： Truong VT,Safdar KS,Kalra DK,Gao X,Ambach S,Taylor MD,Moore R,Taylor RJ,Germann J,Toro-Salazar O,Jefferies JL,Bartone C,Raman SV,Ngo T,Mazur W

更新日期：2017-05-01 00:00:00

abstract：:The objective of our study was to assess the feasibility of dynamic susceptibility contrast MR technique after bolus injection of SPIO and Gd-DOTA in a tumor model implanted in rats. Tumors were subcutaneously implanted in 24 rats. A FLASH sequence and EPI were evaluated. Different doses of AMI 227 and Gd-DOTA were as...

journal_title：Magnetic resonance imaging

authors： Loubeyre P,De Jaegere T,Miao Y,Landuyt W,Marchal G

更新日期：1999-05-01 00:00:00

abstract：:The extent of reaction of 153Gd-radiolabeled Gd(L) chelates with 25 mM CO23- (25 mF), PO34-, Zn2+ and Cu2+ at pH 7 was determined for L = EDTA, DTPA, DOTA, HP-DO3A, and DO3A. Gd(EDTA)- and Gd(DTPA)2- reacted (greater than 20% in 10 min) with Cu2+ and Zn2+ in the presence of PO34-. These double replacement reactions yi...

journal_title：Magnetic resonance imaging

authors： Tweedle MF,Hagan JJ,Kumar K,Mantha S,Chang CA

更新日期：1991-01-01 00:00:00

abstract：:A regularization strategy is described for generalized autocalibrating partially parallel acquisition (GRAPPA) that allows successful calibration using a small number of autocalibration signals (ACS). The approach requires certain nonlinear relationships between the GRAPPA coefficients to be satisfied, which increases...

journal_title：Magnetic resonance imaging

authors： Bydder M,Jung Y

更新日期：2009-01-01 00:00:00

abstract：PURPOSE:To investigate the alterations in water-fat (W-F) ratio of the normal breast tissue of female volunteers as a function of the histological phases of the menstrual cycle. METHODS:Image-guided volume localized in vivo proton ((1)H) magnetic resonance spectroscopy (MRS) at 1.5 T was carried out in the para-areola...

journal_title：Magnetic resonance imaging

authors： Sharma U,Kumar M,Sah RG,Jagannathan NR

更新日期：2009-07-01 00:00:00

abstract：:MRI reconstruction using super-resolution is presented and shown to improve spatial resolution in cases when spatially-selective RF pulses are used for localization. In 2-D multislice MRI, the resolution in the slice direction is often lower than the in-plane resolution. For certain diagnostic imaging applications, is...

journal_title：Magnetic resonance imaging

authors： Greenspan H,Oz G,Kiryati N,Peled S

更新日期：2002-06-01 00:00:00

abstract：:The purpose of this study was to develop a multi-shot dual-echo breathhold fast spin echo technique (DFSE) and compare it with conventional spin echo (T2SE) for T(2)-weighted MR imaging of liver lesions. The DFSE acquisition (EffTE1/EffTE2/TR = 66/143/2100 ms) imaged 5 sections per 17 s breathhold. T2SE imaging (TE1/T...

journal_title：Magnetic resonance imaging

authors： Rydberg JN,Tervonen OA,Rydberg DB,Lomas DJ,Ehman RL,Riederer SJ

更新日期：2000-02-01 00:00:00

abstract：:Dynamic and static gadolinium-diethylenetriaminepentaacetic acid(Gd-DTPA)-enhanced magnetic resonance imaging (MRI) were evaluated as measures of joint inflammation in arthritis, by a comparison with macroscopic and microscopic signs of synovitis. Furthermore, the importance of the size of the evaluated synovial areas...

journal_title：Magnetic resonance imaging

authors： Ostergaard M,Stoltenberg M,Løvgreen-Nielsen P,Volck B,Sonne-Holm S,Lorenzen I

更新日期：1998-09-01 00:00:00

abstract：:With the conventional 3D MR angiographic sequences, it is difficult to prescribe multiple phases in different orientations, though multiple phases may be prescribed in the same orientation as the initial scan. Magnetic resonance angiography (MRA) was performed in which three slabs were prescribed in different orientat...

journal_title：Magnetic resonance imaging

authors： Shetty AN,Bis KG

更新日期：1999-07-01 00:00:00

abstract：BACKGROUND AND PURPOSE:Slice-encoding metal artifact corrections (SEMAC)-view-angle tilting (VAT) sequences have recently been used in clinical protocols to reduce metal artifacts in MR scans of patients with spinal instrumentation. The objective of this study was to compare the SEMAC-VAT sequence with the conventional...

journal_title：Magnetic resonance imaging

authors： Park C,Lee E,Yeo Y,Kang Y,Lee JW,Ahn JM,Kang HS

更新日期：2018-12-01 00:00:00

abstract：:Forty-two patients with clinically suspected osteomyelitis were examined using magnetic resonance imaging (MRI). Twenty-seven patients (64%) had previous surgery or fracture, and 15 (36%) were referred for differentiation of acute osteomyelitis from bone tumors or other pathologic conditions. MRI was compared with com...

journal_title：Magnetic resonance imaging

authors： Berquist TH,Brown ML,Fitzgerald RH Jr,May GR

更新日期：1985-01-01 00:00:00

abstract：:The purpose of the study was to determine whether diffusion-weighted magnetic resonance imaging (DWI) could identify focal lesions that develop in ischemia-sensitive cerebral tissues during reperfusion following global brain ischemia. Localized 1H-Magnetic Resonance Spectroscopy (1H-MRS) measurements were also obtaine...

journal_title：Magnetic resonance imaging

authors： Bizzi A,Righini A,Turner R,Le Bihan D,Bockhorst KH,Alger JR

更新日期：1996-01-01 00:00:00

abstract：:For a number of reasons, it is desirable to fabricate coils which, for a known current, shall produce predetermined values of the magnetic field intensity at a number of points within a nuclear magnetic resonance imager. The calculation of the magnetic field intensity at a set of points involves the integration of the...

journal_title：Magnetic resonance imaging

authors： Letcher JH

更新日期：1989-11-01 00:00:00

abstract：PURPOSE:This study was done to test a series of MR sequences for evaluating the sciatic nerve after total hip arthroplasty (THA). MATERIAL AND METHODS:The study protocol was approved by the institutional review board. Informed consent was obtained from all patients. Twenty-five patients (11 men and 14 women mean age: ...

journal_title：Magnetic resonance imaging

authors： Tagliafico A,Podestà A,Assini A,Boccacini L,Serafini G,Calabrese M,Martinoli C

更新日期：2010-11-01 00:00:00

abstract：:A series of direct shear and nuclear magnetic resonance (NMR) tests were performed on a compacted weakly expansive clay saturated by sodium chloride (NaCl) solutions with different concentrations to study the effect of NaCl solution on the shear strength and its mechanism. Results from the direct shear tests show that...

journal_title：Magnetic resonance imaging

authors： Yu H,Sun D,Tian H

更新日期：2019-05-01 00:00:00