NMR study of the diffusion processes in gels.

abstract：:Several previous 31 phosphorus magnetic resonance spectroscopy ((31)P MRS) studies performing incremental or progressive muscle exercises have observed that a decrease in pH is accompanied with an acceleration in phosphocreatine (PCr) hydrolysis. The purpose of this study was to investigate the relationship between PC...

journal_title：Magnetic resonance imaging

authors： Schocke MF,Esterhammer R,Kammerlander C,Rass A,Kremser C,Fraedrich G,Jaschke WR,Greiner A

更新日期：2004-01-01 00:00:00

abstract：:Spiral acquisition schemes offer unique advantages such as flow compensation, efficient k-space sampling and robustness against motion that make this option a viable choice among other non-Cartesian sampling schemes. For this reason, the main applications of spiral imaging lie in dynamic magnetic resonance imaging suc...

journal_title：Magnetic resonance imaging

authors： Delattre BM,Heidemann RM,Crowe LA,Vallée JP,Hyacinthe JN

更新日期：2010-07-01 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：:In this study, in order to differentiate cavernous hemangioma and hepatic metastases, rapid acquisition relaxation enhanced (RARE) sequence was used. First, in vivo measurements of T1, T2 relaxation times and proton density were obtained using T1, T2 calculation protocol (TOMIKON S50, 0.5T) and multipoint techniques. ...

journal_title：Magnetic resonance imaging

authors： Jafari F,Nayeri N,Tahsini M,Khodadoust AA

更新日期：1999-06-01 00:00:00

abstract：:In this retrospective study we tested the hypothesis that the net effect of impaired electrical conduction and therefore increased heat dissipation in multiple sclerosis (MS) results in elevated lateral ventricular (LV) cerebrospinal fluid (CSF) diffusivity as a measure of brain temperature estimated in vivo using dif...

journal_title：Magnetic resonance imaging

authors： Hasan KM,Lincoln JA,Nelson FM,Wolinsky JS,Narayana PA

更新日期：2015-04-01 00:00:00

abstract：:Many informatics tools have emerged to process the voluminous and complex data generated by functional magnetic resonance imaging (fMRI). The interpretation of fMRI exams is largely determined by these tools. However, their performance is hard to evaluate because there is no independent means of calibration. A novel f...

journal_title：Magnetic resonance imaging

authors： Cheng H,Zhao Q,Duensing GR,Edelstein WA,Spencer D,Browne N,Saylor C,Limkeman M

更新日期：2006-04-01 00:00:00

abstract：OBJECTIVES:To compare the accuracy of contrast-enhanced ultrasound (CEUS) and Dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) for the assessment of changes in tissue vascularization as result of sorafenib treatment in a rat model of hepatocellular carcinoma (HCC). METHODS:Male Buffalo rats with orthot...

journal_title：Magnetic resonance imaging

authors： Muñoz NM,Minhaj AA,Maldonado KL,Kingsley CV,Cortes AC,Taghavi H,Polak U,Mitchell JM,Ensor JE,Bankson JA,Rashid A,Avritscher R

更新日期：2019-04-01 00:00:00

abstract：PURPOSE:In this study we proposed a fully automated method for localizing and segmenting the ascending aortic lumen with phase-contrast magnetic resonance imaging (PC-MRI). MATERIAL AND METHODS:Twenty-five phase-contrast series were randomly selected out of a large population dataset of patients whose cardiac MRI exam...

journal_title：Magnetic resonance imaging

authors： Codari M,Scarabello M,Secchi F,Sforza C,Baselli G,Sardanelli F

更新日期：2018-04-01 00:00:00

abstract：:Diffusion tensor imaging (DTI) was used to investigate the involvement of brain white matter in Williams syndrome (WS), a genetic neurodevelopmental disorder. Whole-brain DTIs were obtained from 16 young adults with WS and 16 normal controls. A voxel-based analysis was performed to compare fractional anisotropy (FA) v...

journal_title：Magnetic resonance imaging

authors： Arlinghaus LR,Thornton-Wells TA,Dykens EM,Anderson AW

更新日期：2011-11-01 00:00:00

abstract：:One of the most critical structural parameters in elastomeric materials is the density of cross-linking between the polymeric chains. This chemical feature greatly affects chain motions and is determinant in controlling mechanical properties of the final product. NMR techniques are widely and efficiently applied to in...

journal_title：Magnetic resonance imaging

authors： Borgia GC,Fantazzini P,Ferrando A,Maddinelli G

更新日期：2001-04-01 00:00:00

abstract：:Focal brain ischemia was induced by middle cerebral artery occlusion in the rat. The volume of cerebral damage was determined 2 days later by MRI in vivo and in the same animals histologically. The edema volume as measured by MRI and the histologically determined infarction was highly correlated. As a consequence, the...

journal_title：Magnetic resonance imaging

authors： Allegrini PR,Sauer D

更新日期：1992-01-01 00:00:00

abstract：:High field MRI has been applied to high-resolution structural and functional imaging of the brain. Echo planar imaging (EPI) is an ultrafast acquisition technique widely used in diffusion imaging, functional MRI and perfusion imaging. However, it suffers from geometric and intensity distortions caused by static magnet...

journal_title：Magnetic resonance imaging

authors： Hong X,To XV,Teh I,Soh JR,Chuang KH

更新日期：2015-11-01 00:00:00

abstract：:To establish the quantitative MR diagnostic criteria for discoid lateral meniscus, MR imaging of 60 knees with arthroscopically confirmed discoid lateral menisci and 134 knees with semilunar lateral menisci were analyzed. Following four quantitative parameters were measured. (1) Meniscal width (MW): The minimum menisc...

journal_title：Magnetic resonance imaging

authors： Samoto N,Kozuma M,Tokuhisa T,Kobayashi K

更新日期：2002-01-01 00:00:00

abstract：:Type A acute aortic dissection (TAAAD) sometimes presents with acute stroke-like symptoms. When intravenous tissue plasminogen activator (IV-tPA) therapy is considered for acute ischemic stroke, TAAAD must be excluded. Painless TAAAD presenting with acute stroke may be easily missed. Two cases of painless TAAAD presen...

journal_title：Magnetic resonance imaging

authors： Matsumoto H,Yoshida Y,Hirata Y

更新日期：2016-09-01 00:00:00

abstract：AIM:To assess imaging findings and characteristics of the lymphatic system in patients affected by lipedema and lipolymphedema of the lower extremities on Non-Contrast MR Lymphography (NCMRL). MATERIALS AND METHODS:44 lower extremities in 11 consecutive female patients affected by lipedema, and 11 patients with lipoly...

journal_title：Magnetic resonance imaging

authors： Cellina M,Gibelli D,Soresina M,Menozzi A,Martinenghi C,Panzeri M,Oliva G

更新日期：2020-09-01 00:00:00

abstract：BACKGROUND AND PURPOSE:The widespread propagation of synchronized neuronal firing in seizure disorders may affect cortical and subcortical brain regions. Diffusion tensor imaging (DTI) can noninvasively quantify white matter integrity. The purpose of this study was to investigate the abnormal changes of white matter in...

journal_title：Magnetic resonance imaging

authors： Meng L,Xiang J,Kotecha R,Rose D,Zhao H,Zhao D,Yang J,Degrauw T

更新日期：2010-11-01 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：: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：:We studied 26 cases of abdominal aortic aneurysm with magnetic resonance imaging (MRI), computed tomography (CT), ultrasonography (US), and angiography. Data acquired were compared to those obtained at surgery. Diameter of the aneurysm was correctly defined in all cases by CT and MRI, while angiography underestimated ...

journal_title：Magnetic resonance imaging

authors： Pavone P,Di Cesare E,Di Renzi P,Marsili L,Ventura M,Spartera C,Passariello R

更新日期：1990-01-01 00:00:00

abstract：:We propose a deuterium diffusion tracer approach to measure diffusion coefficient in the case of very short NMR relaxation times, too short for NMR pulsed field gradient sequences (T1 or T2 below 1 ms). We also treat the case of porous media containing metallic fibers (such as reinforced concrete) strongly disturbing ...

journal_title：Magnetic resonance imaging

authors： Fleury M,Berthe G,Chevalier T

更新日期：2019-02-01 00:00:00

abstract：:Although there is ample evidence in the literature for structural, functional and physiological asymmetries in the two hemispheres of human brain, direct evidence of a similar asymmetry in the in vivo distribution of brain metabolites has been lacking. In this study, the existence of chemical asymmetries in six differ...

journal_title：Magnetic resonance imaging

authors： Jayasundar R,Raghunathan P

更新日期：1997-01-01 00:00:00

abstract：PURPOSE:Our study aimed to develop accelerated microscopic diffusional kurtosis imaging (μDKI) and preliminarily evaluated it in a rodent model of chronic epilepsy. METHODS:We investigated two μDKI acceleration schemes of reduced sampling density and angular range in a phantom and wild-type rats, and further tested μD...

journal_title：Magnetic resonance imaging

authors： Ji Y,Lu D,Wu L,Qiu B,Song YQ,Sun PZ

更新日期：2019-02-01 00:00:00

abstract：:Magnetic field inhomogeneities like eddy current-related gradient fields cause geometric distortions in echo-planar imaging (EPI). This in particular affects diffusion-weighted imaging where these distortions vary with the direction of the diffusion weighting and hamper the accurate determination of diffusion paramete...

journal_title：Magnetic resonance imaging

authors： Finsterbusch J

更新日期：2010-04-01 00:00:00

abstract：:Our purpose was to investigate three-dimensional (3D) gadolinium-enhanced magnetic resonance angiography (Gd-MRA) in the evaluation of renal transplant arteries. Eleven MR angiography examinations were performed in nine renal transplant patients. Gd-MRA, three-dimensional phase contrast (3D-PC) post-gadolinium, and tw...

journal_title：Magnetic resonance imaging

authors： Johnson DB,Lerner CA,Prince MR,Kazanjian SN,Narasimham DL,Leichtman AB,Cho KJ

更新日期：1997-01-01 00:00:00

abstract：:The non-Einstein diffusion behavior of water in a model biological tissue system, intact duck embryos, has been investigated by the use of an in vivo proton pulsed-gradient spin-echo (PGSE) MR imaging technique. Multiple-frame MR images of the intact duck embryos and control solution (0.5 mM CuSO4 doped water) were ac...

journal_title：Magnetic resonance imaging

authors： Cheng KH

更新日期：1993-01-01 00:00:00

abstract：:The relative value of two different MRI procedures for the assessment of infratentorial extension in multiple sclerosis (MS) was studied. Multislice spin-echo techniques were used overall. Procedure A consisted of parasagittal T1-weighted images (500/30) and axial T2-weighted images (2500/30, 2500/120). Procedure B co...

journal_title：Magnetic resonance imaging

authors： Van de Vyver FL,Truyen L,Gheuens J,Degryse HR,Peersman GV,Martin JJ

更新日期：1989-05-01 00:00:00

abstract：:Diffusion in the extracellular and intracellular spaces (ECS and ICS, respectively) was evaluated in excised spinal cords, before and after cell swelling induced by glutamate, by high b-value q-space diffusion MR of specific markers and water. The signal decays of deuterated tetramethylammonium (TMA-d(12)) chloride, a...

journal_title：Magnetic resonance imaging

authors： Biton IE,Mayk A,Assaf Y,Cohen Y

更新日期：2004-06-01 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：:The most recently reported magnetic resonance first-pass myocardial perfusion studies were restricted to single slice imaging or a data analysis based on interactively placed regions of interest. This study was designed to investigate a new saturation recovery TurboFLASH sequence for multisection myocardial perfusion ...

journal_title：Magnetic resonance imaging

authors： Penzkofer H,Wintersperger BJ,Knez A,Weber J,Reiser M

更新日期：1999-02-01 00:00:00

abstract：:Pulsed field gradient (PFG) nuclear magnetic resonance (NMR) and microimaging experiments have been performed to study the diffusion of liquid alkanes into a variety of semicrystalline polyethylene (PE) samples. The results highlight the importance of the crystalline phase in controlling the diffusion process in terms...

journal_title：Magnetic resonance imaging

authors： Harding SG,Gladden LF

更新日期：1998-06-01 00:00:00