Detection of mycotic pseudoaneurysm of the ascending aorta using MRI.

abstract：:A magnetic resonance imaging cardiac magnetic susceptometry (MRI-CS) technique for assessing cardiac tissue iron concentration based on phase mapping was developed. Normal control subjects (n=9) and thalassemia patients (n=13) receiving long-term blood transfusion therapy underwent MRI-CS and MRI measurements of the c...

journal_title：Magnetic resonance imaging

authors： Wang ZJ,Fischer R,Chu Z,Mahoney DH Jr,Mueller BU,Muthupillai R,James EB,Krishnamurthy R,Chung T,Padua E,Vichinsky E,Harmatz P

更新日期：2010-04-01 00:00:00

abstract：:Etched particle tracks produced after heavy ion irradiation of polymer foils are used as model systems to test the performance of NMR in a newly developed ultrahigh magnetic field gradient system. The stimulated NMR echo decay of molecules diffusing in the channels, formulated in terms of the self part of the intermed...

journal_title：Magnetic resonance imaging

authors： Fujara F,Ilyina E,Nienstaedt H,Sillescu H,Spohr R,Trautmann C

更新日期：1994-01-01 00:00:00

abstract：PURPOSE:Rapid regional fluctuations in GABA may result in inhomogeneous concentrations throughout the brain parenchyma. The goal of this study is to provide further insight into the natural distribution of GABA throughout the brain and thus determine if a surrogate site may be used for spectroscopy when evaluating moto...

journal_title：Magnetic resonance imaging

authors： Durst CR,Michael N,Tustison NJ,Patrie JT,Raghavan P,Wintermark M,Sendhil Velan S

更新日期：2015-06-01 00:00:00

abstract：:The NMR relaxivities of Gd-EOB-DTPA and Gd-DTPA were determined in the kidney and liver of intact male Wistar rats immediately following sacrifice and in vitro in solutions and gels, at 1.5 T using a clinical MR scanner, T1 and T2 values of tissue samples were derived from spin-echo image sequences. Tissue gadolinium ...

journal_title：Magnetic resonance imaging

authors： Shuter B,Tofts PS,Wang SC,Pope JM

更新日期：1996-01-01 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：PURPOSE:To introduce a simple analytical formula for estimating T2 from a single Double-Echo in Steady-State (DESS) scan. METHODS:Extended Phase Graph (EPG) modeling was used to develop a straightforward linear approximation of the relationship between the two DESS signals, enabling accurate T2 estimation from one DES...

journal_title：Magnetic resonance imaging

authors： Sveinsson B,Chaudhari AS,Gold GE,Hargreaves BA

更新日期：2017-05-01 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：: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：: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：:The purpose of this study was to evaluate the diagnostic potential of a high-resolution magnetic resonance (MR) venography technique in patients with cerebral arteriovenous malformations (AVMs). A high-resolution 3D gradient echo sequence was used with a long echo time TE to obtain venous information down to sub-pixel...

journal_title：Magnetic resonance imaging

authors： Essig M,Reichenbach JR,Schad LR,Schoenberg SO,Debus J,Kaiser WA

更新日期：1999-12-01 00:00:00

abstract：:The ability to evaluate empirical diffusion MRI acquisitions for quality and to correct the resulting imaging metrics allows for improved inference and increased replicability. Previous work has shown promise for estimation of bias and variance of generalized fractional anisotropy (GFA) but comes at the price of compu...

journal_title：Magnetic resonance imaging

authors： Hainline AE,Nath V,Parvathaneni P,Schilling KG,Blaber JA,Anderson AW,Kang H,Landman BA

更新日期：2019-06-01 00:00:00

abstract：PURPOSE:To describe the MR appearances of hepatic sarcoidosis in patients with chronic liver disease and correlate the results with clinical stage of disease as measured with the Mayo end-stage liver disease (MELD) score. MATERIALS AND METHODS:Twenty patients with chronic liver disease and histopathological diagnosis ...

journal_title：Magnetic resonance imaging

authors： Ferreira A,Ramalho M,de Campos RO,Heredia V,Roque A,Vaidean G,Semelka RC

更新日期：2013-04-01 00:00:00

abstract：:Geometric distortion in MR imaging predominantly arises from the inhomogeneity of the static field and the nonlinearity of the gradients. It is the purpose of this paper to analyse the object and machine related contributions to geometric distortion in order to determine which corrections are necessary for attaining a...

journal_title：Magnetic resonance imaging

authors： Bakker CJ,Moerland MA,Bhagwandien R,Beersma R

更新日期：1992-01-01 00:00:00

abstract：:Quantifying the intracranial tissue volume changes in magnetic resonance imaging (MRI) assists specialists to analyze the effects of natural or pathological changes. Since these changes can be subtle, the accuracy of the automatic compartmentalization method is always criticized by specialists. We propose and then eva...

journal_title：Magnetic resonance imaging

authors： Azimbagirad M,Simozo FH,Senra Filho ACS,Murta Junior LO

更新日期：2020-01-01 00:00:00

abstract：:In this paper, we have presented a two stage method, using kernel principal component analysis (KPCA) and rough set theory (RST), for denoising volumetric MRI data. A rough set theory (RST) based clustering technique has been used for voxel based processing. The method groups similar voxels (3D cubes) using class and ...

journal_title：Magnetic resonance imaging

authors： Phophalia A,Mitra SK

更新日期：2017-02-01 00:00:00

abstract：:The phase difference method of phase contrast MR angiography provides a means of measuring the average velocity in each voxel of an MR scan. When static tissue is present in a voxel containing flow, the measured velocity is not the average velocity of the flow alone, but is lower due to the partial volume effect of th...

journal_title：Magnetic resonance imaging

authors： Hamilton CA

更新日期：1994-01-01 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：: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：PURPOSE:The purpose of this study was to assess relationships between intramuscular adipose tissue (IntraMAT) content determined by MRI and intramyocellular lipids (IMCL) and extramyocellular lipids (EMCL) determined by (1)H magnetic resonance spectroscopy ((1)H MRS) or echo intensity determined by B-mode ultrasonograp...

journal_title：Magnetic resonance imaging

authors： Akima H,Hioki M,Yoshiko A,Koike T,Sakakibara H,Takahashi H,Oshida Y

更新日期：2016-05-01 00:00:00

abstract：INTRODUCTION:Pharmacokinetic parameters derived from dynamic contrast-enhanced MRI (DCE-MRI) data are sensitive to acquisition and post-processing techniques, which makes it difficult to compare results obtained using different methods. In particular, one of the most important factors affecting estimation of model para...

journal_title：Magnetic resonance imaging

authors： Wake N,Chandarana H,Rusinek H,Fujimoto K,Moy L,Sodickson DK,Kim SG

更新日期：2018-10-01 00:00:00

abstract：:The location and masking of the brain and surrounding cerebrospinal fluid (CSF) in two-dimensional (2D) dual-echo fast spin-echo (FSE) magnetic resonance (MR) images of the head is achieved by an automated procedure with a voxel-based computational algorithm. Linear scale-space features are derived from the short-echo...

journal_title：Magnetic resonance imaging

authors： Suckling J,Brammer MJ,Lingford-Hughes A,Bullmore ET

更新日期：1999-02-01 00:00:00

abstract：:Combining electrical stimulation with fMRI (esfMRI) has proven to be an important tool to study the global effects of electrical stimulation on neural networks in the brain. Here we extend our previous studies to stimulating the upper superior temporal sulcus (STS) in the anesthetized monkey. Our results show that sti...

journal_title：Magnetic resonance imaging

authors： Sultan F,Augath M,Murayama Y,Tolias AS,Logothetis N

更新日期：2011-12-01 00:00:00

abstract：:It is often desirable to separate voxels that contain signal from tissue along with measurement noise from those that contain purely measurement noise. Generally, this separation called thresholding utilizes only the magnitude portion of the images. Recently, methods have been developed that utilize both the magnitude...

journal_title：Magnetic resonance imaging

authors： Rowe DB,Haacke EM

更新日期：2009-11-01 00:00:00

abstract：:Glioblastoma Multiforme is the most common and most aggressive type of brain tumors. Although accurate prediction of Glioblastoma borders and shape is absolutely essential for neurosurgeons, there are not many in silico platforms that can make such predictions. In the current study, an automatic patient-specific simul...

journal_title：Magnetic resonance imaging

authors： Hajishamsaei M,Pishevar A,Bavi O,Soltani M

更新日期：2020-05-01 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：:A fast spin echo two-point Dixon (fast 2PD) technique was developed for efficient T2-weighted imaging with uniform water and fat separation. The technique acquires two interleaved fast spin echo images with water and fat in-phase and 180 degrees out-of-phase, respectively, and generates automatically separate water an...

journal_title：Magnetic resonance imaging

authors： Ma J,Son JB,Bankson JA,Stafford RJ,Choi H,Ragan D

更新日期：2005-12-01 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：:Compressed sensing has shown great potential in reducing data acquisition time in magnetic resonance imaging (MRI). In traditional compressed sensing MRI methods, an image is reconstructed by enforcing its sparse representation with respect to a preconstructed basis or dictionary. In this paper, patch-based directiona...

journal_title：Magnetic resonance imaging

authors： Qu X,Guo D,Ning B,Hou Y,Lin Y,Cai S,Chen Z

更新日期：2012-09-01 00:00:00

abstract：:Diffusion-weighted imaging (DWI) is a relatively new magnetic resonance imaging (MRI) technique that can be used to probe the microenvironment of water. Contrast in DWI depends on properties different from traditional T1 and T2 contrast, and is derived form the translational motion of water molecules. Since it is reas...

journal_title：Magnetic resonance imaging

authors： Helpern JA,Huang N

更新日期：1995-01-01 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