Neurophysiological and functional MRI evidence of reorganization of cortical motor areas in cerebral arteriovenous malformation.

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：:The goal of this study was to determine whether presurgical metabolite levels measured by 3D MR Spectroscopic Imaging (MRSI) can accurately detect viable cancer within human brain tumor masses. A total of 31 patients (33 exams, 39 pathology correlations) with brain tumors were studied prior to surgical biopsy and/or r...

journal_title：Magnetic resonance imaging

authors： Vigneron D,Bollen A,McDermott M,Wald L,Day M,Moyher-Noworolski S,Henry R,Chang S,Berger M,Dillon W,Nelson S

更新日期：2001-01-01 00:00:00

abstract：:Partial volume effects in proton magnetic resonance spectroscopy in the brain have been studied previously in terms of proper water concentration calculations, but there is a lack of disclosure in terms of voxel placement techniques that would affect the calculations. The purpose of this study is to facilitate a fully...

journal_title：Magnetic resonance imaging

authors： Lee H,Caparelli E,Li H,Mandal A,Smith SD,Zhang S,Bilfinger TV,Benveniste H

更新日期：2013-09-01 00:00:00

abstract：:A new application of the stimulated echo pulse sequence is presented that permits the elucidation of molecular order and dynamics in a time scale between about 100 microseconds and the spin-lattice relaxation time. The technique exploits the influence of dipolar coupling on the quotient of the stimulated and primary e...

journal_title：Magnetic resonance imaging

authors： Grinberg F,Kimmich R,Stapf S

更新日期：1996-01-01 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：:Merkel cell carcinoma (MCC) is a rare malignant tumor of the skin and often is diagnosed histologically as lymphoma, melanoma and even metastatic small cell carcinoma of the lung (SCCL). Classified as a neuroendocrine tumor, clinically it originates in the head and neck region and may present with metastatic disease a...

journal_title：Magnetic resonance imaging

authors： Moayed S,Maldjianb C,Adam R,Bonakdarpour A

更新日期：2000-10-01 00:00:00

abstract：:We compared the ability of magnetic resonance imaging (MRI) using a 0.064 T permanent magnet, three-phase bone scanning, and indium-labeled white blood cell (111In-WBC) scanning, to diagnose osteomyelitis. Twenty-three patients underwent biopsy. All patients were examined at presentation with all three modalities. Sen...

journal_title：Magnetic resonance imaging

authors： Williamson MR,Quenzer RW,Rosenberg RD,Meholic AJ,Eisenberg B,Espinosa MC,Hartshorne MF

更新日期：1991-01-01 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：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：:We have developed an in vivo longitudinally detected ESR (LODESR) imaging system operating at 700 MHz based on a loop-gap resonator and a pair of saddle-type pickup coils. A good linear relationship between the LODESR signal intensity and the applied power in a range up to 15.8 W was obtained. The detection of LODESR ...

journal_title：Magnetic resonance imaging

authors： Yokoyama H,Sato T,Tsuchihashi N,Ogata T,Ohya-Nishiguchi H,Kamada H

更新日期：1997-01-01 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

abstract：:Magnetic resonance spectroscopy (MRS) is ideally suited for physiology-neurochemistry experiments with the living brain and particularly for studies on the primary visual cortex (striate cortex or area V1). Yet, the highly convoluted form of the human V1 has thus far prevented the performance of MRS investigations tha...

journal_title：Magnetic resonance imaging

authors： Juchem C,Logothetis NK,Pfeuffer J

更新日期：2007-07-01 00:00:00

abstract：:The purpose of this investigation is to evaluate the positioning and to confirm the volume concept of the Lea's Shield diaphragm utilizing MR imaging. We evaluated the device in two women, one nulliparous and one multiparous. We were able to comprehensively evaluate the device in both patients and answer all questions...

journal_title：Magnetic resonance imaging

authors： Maldjian C,Pelosi MA 2nd,Pelosi MA 3rd,Adam R

更新日期：2001-06-01 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：:A new approach is introduced for non-rigid registration of a pair of magnetic resonance images (MRI). It is a generalization of the demons algorithm with low computational cost, based on local information augmentation (by integrating multiple images) and balanced implementation. Specifically, a single deformation that...

journal_title：Magnetic resonance imaging

authors： Mesin L

更新日期：2020-12-01 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：:Glycosaminoglycan Chemical Exchange Saturation Transfer (gagCEST) is an important molecular MRI methodology developed to assess changes in cartilage GAG concentrations. The correction for B0 field inhomogeneity is technically crucial in gagCEST imaging. This study evaluates the accuracy of the B0 estimation determined...

journal_title：Magnetic resonance imaging

authors： Wei W,Jia G,Flanigan D,Zhou J,Knopp MV

更新日期：2014-01-01 00:00:00

abstract：:An NMR technique is described which allows the observation of ionic charge carriers moving in the electric field within a porous system saturated with electrolyte solution. This method, which was recently developed in our laboratory, gives experimental access to the study of electric transport in disordered media on a...

journal_title：Magnetic resonance imaging

authors： Holz M,Heil SR,Schwab IA

更新日期：2001-04-01 00:00:00

abstract：OBJECTIVE:To characterize capillary perfusion and tissue diffusion changes in transplant renal artery stenosis (TRAS) with diffusion-weighted imaging (DWI). MATERIALS & METHODS:We retrospectively identified 30 patients with non-contrast enhanced magnetic resonance angiography-proven TRAS. Another 20 kidney transplant ...

journal_title：Magnetic resonance imaging

authors： Fan M,Ni X,Li Y,Chen J,Cheng D,Shi D,He X,Wen J

更新日期：2019-07-01 00:00:00

abstract：PURPOSE:To evaluate the use of the double-echo steady-state (DESS) sequence for acquiring high-resolution breast images with diffusion and T2 weighting. MATERIALS AND METHODS:Phantom scans were used to verify the T2 and diffusion weighting of the DESS sequence. Image distortion was evaluated in volunteers by comparing...

journal_title：Magnetic resonance imaging

authors： Granlund KL,Staroswiecki E,Alley MT,Daniel BL,Hargreaves BA

更新日期：2014-05-01 00:00:00

abstract：:Prostate MRI is an important tool to diagnose and characterize cancer. High local sensitivity and good parallel imaging performance are of paramount importance for diagnostic quality and efficiency. The purpose of this work was to evaluate stacked resonators as part of a surface receiver array for prostate MRI at 3 Te...

journal_title：Magnetic resonance imaging

authors： Chacon-Caldera J,Fischer A,Malzacher M,Vetter Y,Davids M,Flöser M,Stumpf C,Schad LR

更新日期：2018-11-01 00:00:00

abstract：:Surface modification of liposomes containing Gd-diethylenetriaminepentaacetyl-phosphatidylethanolamine (Gd-DTPA-PE) as an amphiphilic paramagnetic label influences their contrast properties as MRI agents. Liposomes with the mean diameter ca. 220 nm and 10% mol content of Gd-DTPA-PE were modified with dextran (molecula...

journal_title：Magnetic resonance imaging

authors： Trubetskoy VS,Cannillo JA,Milshtein A,Wolf GL,Torchilin VP

更新日期：1995-01-01 00:00:00

abstract：:Relaxation time measurements were carried out during the preacute stage of lesion progression in an animal model of demyelination created in the internal capsule (ic) area of the rat brain using lysophosphatidyl choline (LPC). T1 and T2 were determined both before and after 36 h of lesion creation. Histology carried o...

journal_title：Magnetic resonance imaging

authors： Degaonkar MN,Raghunathan P,Jayasundar R,Jagannathan NR

更新日期：2005-01-01 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：: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：:BOLD-contrast functional magnetic resonance imaging (MRI) was used to assess the evolution of tumor oxygenation and blood flow after administration of four different anesthetics: pentobarbital (60 mg/kg), ketamine/xylazine (80/8 mg/kg), fentanyl/droperidol (0.078/3.9 mg/kg), and isoflurane (1.5%). Gradient echo sequen...

journal_title：Magnetic resonance imaging

authors： Baudelet C,Gallez B

更新日期：2004-09-01 00:00:00

abstract：:Quantitative processing of NMR relaxation images depends on the characteristics of the used fitting algorithm. Therefore several common fitting algorithms are compared for decay curves with low signal-to-noise ratios. The use of magnitude data yields a non-zero base line, and is shown to result in an overestimation of...

journal_title：Magnetic resonance imaging

authors： van der Weerd L,Vergeldt FJ,Adrie de Jager P,Van As H

更新日期：2000-11-01 00:00:00

abstract：:The midcalf muscles of eight patients who had peripheral arterial occlusive disease were evaluated by exercise MRI before and after bypass surgery or percutaneous transluminal angioplasty. MRI showed a high intensity of these muscles, especially the posterior muscles, after exercise in all patients before intervention...

journal_title：Magnetic resonance imaging

authors： Yoshioka H,Anno I,Kuramoto K,Matsumoto K,Jikuya T,Itai Y

更新日期：1995-01-01 00:00:00

abstract：:Trabecular bone structure and bone density contribute to the strength of bone and are important in the study of osteoporosis. Wavelets are a powerful tool in characterizing and quantifying texture in an image. The purpose of this study was to validate wavelets as a tool in computing trabecular bone thickness directly ...

journal_title：Magnetic resonance imaging

authors： Krug R,Carballido-Gamio J,Burghardt AJ,Haase S,Sedat JW,Moss WC,Majumdar S

更新日期：2007-04-01 00:00:00

abstract：:The purpose of this study was to develop a novel intravascular loopless monopole antenna (ILMA) design specifically for imaging of small vessel walls. The ILMA consisted of an unshielded, low-friction guide wire and a tuning/matching box. The material of the guide wire was nitinol and it was coated with polyurethane. ...

journal_title：Magnetic resonance imaging

authors： Yuan H,Lv X,Ma X,Zhang R,Fu Y,Yang X,Wang X,Zhang Z,Zhang J,Fang J

更新日期：2013-01-01 00:00:00