MRI findings in pulmonary sarcoidosis.

abstract：:Blood circulation is an important determinant of the biodistribution of superparamagnetic iron oxide nanoparticles. Here we present a magnetic resonance imaging (MRI) technique based on the use of ultrafast echo times (UTE) for the noninvasive determination of blood half-lives at high particle concentrations, when con...

journal_title：Magnetic resonance imaging

authors： Scharlach C,Warmuth C,Schellenberger E

更新日期：2015-11-01 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：PURPOSE:The purpose was to validate diffusion-weighted imaging (DWI) in the assessment of hepatic metastases compared with superparamagnetic iron oxide (SPIO)-enhanced magnetic resonance imaging. MATERIALS AND METHODS:For 21 consecutive patients with 160 metastases from extrahepatic malignancy and 25 benign focal lesi...

journal_title：Magnetic resonance imaging

authors： Kim H,Yu JS,Cho ES,Chung JJ,Kim JH,Kim DJ,Ahn JH,Kim KW

更新日期：2012-05-01 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：:New applications of the NMR-MOUSE (mobile universal surface explorer) to non-destructive quality control of elastomers are reported. One example concern the thermal aging of fast clutches which was probed by measurements of 1H transverse relaxation time. Novel methodological developments show that 1H double-quantum fi...

journal_title：Magnetic resonance imaging

authors： Kühn H,Klein M,Wiesmath A,Demco DE,Blümich B,Kelm J,Gold PW

更新日期：2001-04-01 00:00:00

abstract：:Open-configuration magnetic resonance imaging (MRI) systems are becoming increasingly desirable for musculoskeletal imaging and image-guided radiotherapy because of their non-claustrophobic configuration. However, geometric image distortion in large fields-of-view (FOV) due to field inhomogeneity and gradient nonlinea...

journal_title：Magnetic resonance imaging

authors： Hong C,Lee DH,Han BS

更新日期：2014-07-01 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 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：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：: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：:Peripheral magnetic resonance angiography (MRA) is growing in use. However, methods of performing peripheral MRA vary widely and continue to be optimized, especially for improvement in illustration of infrapopliteal arteries. The main purpose of this project was to identify imaging factors that can improve arterial vi...

journal_title：Magnetic resonance imaging

authors： Hood MN,Ho VB,Foo TK,Marcos HB,Hess SL,Choyke PL

更新日期：2002-09-01 00:00:00

abstract：:Eighty-nine cases after anterior cruciate ligaments (ACL) reconstruction were followed prospectively with magnetic resonance imaging (MRI). The patients were examined using axial and sagittal MRI at least twice during the postoperative evaluation of reconstructed ACL. Two cases of pretibial cyst formation were observe...

journal_title：Magnetic resonance imaging

authors： Deie M,Sumen Y,Ochi M,Murakami Y,Fujimoto E,Ikuta Y

更新日期：2000-10-01 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：:A new method for generating diffusion contrast in magnetic resonance imaging is presented. This technique is robust enough to allow implementation on conventional imaging systems without hardware modifications. Results from phantom measurements are reported. Qualitative contrast changes in magnetic resonance images de...

journal_title：Magnetic resonance imaging

authors： Norwood TJ,Williams SC

更新日期：1993-01-01 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：:The purpose of this study was to develop a method to determine time discrepancies between input and myocardial time-signal intensity (TSI) curves for accurate estimation of myocardial perfusion with first-pass contrast-enhanced MRI. Estimation of myocardial perfusion with contrast-enhanced MRI using kinetic models req...

journal_title：Magnetic resonance imaging

authors： Natsume T,Ishida M,Kitagawa K,Nagata M,Sakuma H,Ichihara T

更新日期：2015-11-01 00:00:00

abstract：:The nonhuman primate brain study provides important supplemental means for human brain exploration since the two species share close anatomical and functional similarities. MR diffusion tensor imaging (DTI) in human brain has revealed exquisite details of brain structures especially in the brain white matter. However,...

journal_title：Magnetic resonance imaging

authors： Liu X,Zhu T,Gu T,Zhong J

更新日期：2009-04-01 00:00:00

abstract：:The misunderstanding of the labeling for an "MR conditional" respiratory ventilator system resulted in the placement of this device, which had substantial ferromagnetic components, too close to a 3-T magnetic resonance (MR) system, causing a projectile incident. Magnetic resonance imaging health care professionals sho...

journal_title：Magnetic resonance imaging

authors： Greenberg KL,Weinreb J,Shellock FG

更新日期：2011-10-01 00:00:00

abstract：:We implemented pseudo-continuous ASL (pCASL) with 2D and 3D balanced steady state free precession (bSSFP) readout for mapping blood flow in the human brain, retina, and kidney, free of distortion and signal dropout, which are typically observed in the most commonly used echo-planar imaging acquisition. High resolution...

journal_title：Magnetic resonance imaging

authors： Park SH,Wang DJ,Duong TQ

更新日期：2013-09-01 00:00:00

abstract：:In this manuscript, fast and clinically feasible model-based bootstrapping algorithms using a geometrically constrained two-tensor diffusion model are employed for estimating uncertainty in fiber orientation. A Monte-Carlo-based tensor morphology voxel classification algorithm is initially applied using single-tensor ...

journal_title：Magnetic resonance imaging

authors： Ratnarajah N,Simmons A,Bertoni M,Hojjatoleslami A

更新日期：2013-02-01 00:00:00

abstract：:In this paper, a new reaction-diffusion model with viscous stress tensor is proposed for modeling the diffusion and invasion of brain glioma cells, which is based on the model in Yuan J.J., Liu L., Hu Q.M. Mathematical modeling of brain glioma growth using modified reaction-diffusion equation on brain MR images. Compu...

journal_title：Magnetic resonance imaging

authors： Yuan J,Liu L

更新日期：2016-02-01 00:00:00

abstract：:Before it is possible to use MR imaging to investigate changes in the hippocampus in disease processes such as epilepsy and memory disorders, it is imperative that normal variations are defined. Using specific anatomic locations, we evaluated the hippocampi of 29 normal volunteers with coronal MR studies. Mild variati...

journal_title：Magnetic resonance imaging

authors： Bronen RA,Cheung G

更新日期：1991-01-01 00:00:00

abstract：:A four-channel Tic-Tac-Toe (TTT) transmit RF coil was designed and constructed for foot and ankle imaging at 7T MRI. Numerical simulations using an in-house developed FDTD package and experimental analyses using a homogenous phantom show an excellent agreement in terms of B1+ field distribution and s-parameters. Simul...

journal_title：Magnetic resonance imaging

authors： Santini T,Kim J,Wood S,Krishnamurthy N,Farhat N,Maciel C,Raval SB,Zhao T,Ibrahim TS

更新日期：2018-01-01 00:00:00

abstract：PURPOSE:To evaluate the application of high-resolution MRI methodology for characterizing the fluid velocity field and evaluate fluid shear field within a simplified in vitro model of a bone-implant interface. MATERIALS AND METHODS:The study used a specific micromotion canine bone implant that has been used for over a...

journal_title：Magnetic resonance imaging

authors： Conroy MJ,Pédrono A,Bechtold JE,Søballe K,Ambard D,Swider P

更新日期：2006-06-01 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：:Use of conjugated equine estrogens (CEE) has been linked to smaller regional brain volumes in women aged ≥65 years; however, it is unknown whether this results in a broad-based characteristic pattern of effects. Structural magnetic resonance imaging was used to assess regional volumes of normal tissue and ischemic les...

journal_title：Magnetic resonance imaging

authors： Casanova R,Espeland MA,Goveas JS,Davatzikos C,Gaussoin SA,Maldjian JA,Brunner RL,Kuller LH,Johnson KC,Mysiw WJ,Wagner B,Resnick SM,Women's Health Initiative Memory Study.

更新日期：2011-05-01 00:00:00

abstract：:Rhizomelic chondrodysplasia punctata is a member of genetic peroxisomal disorders. Delayed myelination, which is probably related to the inadequacy of plasmalogens biosynthesis, is an important feature of this disorder. Direct assessment of neuropathologic aspects of RCDP syndrome such as neuronal degeneration and del...

journal_title：Magnetic resonance imaging

authors： Alkan A,Kutlu R,Yakinci C,Sigirci A,Aslan M,Sarac K

更新日期：2003-01-01 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：: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 application of NMR Fricke-gelatin dosimetry to the imaging of dose distributions around high dose rate (HDR) radioactive Ir-192 seeds in brachytherapy is presented. The duration of the irradiations required to give changes of the Fricke-gelatin NMR characteristics, which were readily detected by the magnetic reson...

journal_title：Magnetic resonance imaging

authors： Schreiner LJ,Crooks I,Evans MD,Keller BM,Parker WA

更新日期：1994-01-01 00:00:00