Error propagation model for microscopic magnetic resonance elastography shear-wave images.

abstract：:Balanced steady-state free precession (SSFP) sequences use fully re-focussed gradient waveforms to achieve a high signal and useful image contrast in short scan times. Despite these strengths, the clinical feasibility of balanced SSFP is still limited both by bright fat signal and by the signal voids that result from ...

journal_title：Magnetic resonance imaging

authors： Hargreaves BA,Bangerter NK,Shimakawa A,Vasanawala SS,Brittain JH,Nishimura DG

更新日期：2006-02-01 00:00:00

abstract：:In certain nuclear magnetic resonance (NMR) applications in which accessibility to the gantry is limited, performing optimal tuning and matching represents a major problem. Here, we discuss a method of tuning NMR probe circuits and matching their impedances which uses cables with different impedance values. This simpl...

journal_title：Magnetic resonance imaging

authors： Villa P,Vaquero JJ,Chesnick S,Ruiz-Cabello J

更新日期：1999-09-01 00:00:00

abstract：:In the breast carcinamas, sentinel lymph node biopsy (SLNB) attracts attention as technique to be settled by axillary lymph node metastasis, but existence of a false negative case is a problem. Equivalent cross relaxation rate image (ECRI) is the measurement method that we can evaluate a change of organization structu...

journal_title：Magnetic resonance imaging

authors： Matsushima S,Sasaki F,Sarumaru S,Ohta D,Era S,Sogami M,Inaba T,Kinosada Y

更新日期：2003-11-01 00:00:00

abstract：:Tracking of signal intensity changes in soft tissue over time is often hampered by deformation of the tissue. In this study a method is described that uses finite element modeling to compensate for tissue deformation. The method is applied to the quantification of fluid redistribution in an intervertebral disc that de...

journal_title：Magnetic resonance imaging

authors： Kingma I,Weinans H,van Dieën JH,de Boer RW

更新日期：1998-01-01 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：:We compared the ability and reproducibility of a fast fluid-attenuated inversion recovery (fast-FLAIR) sequence with and without a magnetization transfer (MT) pulse for detecting and measuring multiple sclerosis (MS)-related abnormalities on magnetic resonance imaging (MRI) scans from 20 patients. The Contrast-to-Nois...

journal_title：Magnetic resonance imaging

authors： Filippi M,Rocca MA,Mastronardo G,Comi G

更新日期：1999-04-01 00:00:00

abstract：:We have applied diffusion and relaxation Nuclear Magnetic Resonance experiments to investigate the translational and rotational mobility of adsorbents on quartz and calcite mineral surfaces. On both surfaces it was found that water is the dominant molecule. On the quartz surface the majority of water molecules have a ...

journal_title：Magnetic resonance imaging

authors： Sørgård HN,Totland C,Nerdal W,Seland JG

更新日期：2019-02-01 00:00:00

abstract：:Quantitative longitudinal brain magnetic resonance (MR) studies may be confounded by scanner-related drifts in voxel sizes. Total intracranial volume (TIV) normalisation is commonly used to correct serial cerebral volumetric measurements for these drifts. We hypothesised that automated rigid-body registration of whole...

journal_title：Magnetic resonance imaging

authors： Whitwell JL,Schott JM,Lewis EB,MacManus DG,Fox NC

更新日期：2004-09-01 00:00:00

abstract：PURPOSE:To evaluate the clinical outcomes of conservative management by observation with MRI of patients with branch-duct intraductal papillary mucinous neoplasms (BD-IPMNs). MATERIALS AND METHODS:Twenty-three consecutive patients, who were followed up by MRI with magnetic resonance cholangiopancreatography (MRCP) ove...

journal_title：Magnetic resonance imaging

authors： Shin SS,Armao DM,Shah M,Kim YH,Lee CH,Rubinas T,Brubaker LM,Semelka RC

更新日期：2010-12-01 00:00:00

abstract：PURPOSE:To assess the ability and reproducibility of Non-contrast Magnetic Resonance Lymphography (NMRL) in detecting and quantify lymphedema, using a semiquantitative scoring system. METHODS AND MATERIAL:This is a monocentric retrospective study of 134 consecutive patients with a clinical diagnosis of limb lymphedema...

journal_title：Magnetic resonance imaging

authors： Franconeri A,Ballati F,Panzuto F,Raciti MV,Smedile A,Maggi A,Asteggiano C,Esposito M,Stoppa D,Lungarotti L,Bortolotto C,Giardini D,De Silvestri A,Calliada F

更新日期：2020-05-01 00:00:00

abstract：:Pulsed arterial spin labeling (PASL) is an increasingly common technique for noninvasively measuring cerebral blood flow (CBF) and has previously been shown to have good repeatability. It is likely to find a place in clinical trials and in particular the investigation of pharmaceutical agents active in the central ner...

journal_title：Magnetic resonance imaging

authors： Murphy K,Harris AD,Diukova A,Evans CJ,Lythgoe DJ,Zelaya F,Wise RG

更新日期：2011-12-01 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：:Phantoms for evaluation of nuclear magnetic resonance (NMR) imaging systems were made from water-based agarose gels, according to a standard procedure herein described. Copper sulfate (CuSO4) was included in the gels to further affect their proton relaxation characteristics. The proton relaxation rates of each batch o...

journal_title：Magnetic resonance imaging

authors： Mitchell MD,Kundel HL,Axel L,Joseph PM

更新日期：1986-01-01 00:00:00

abstract：:The dependence of BOLD signal change (BSC) on baseline hematocrit is in the process of being characterized, primarily using conventional Gradient Echo (GE) echo planar imaging (EPI). We describe the first empiric exploration of this relationship using, in addition to GE, Spin Echo (SE) and two Asymmetric Spin Echo EPI...

journal_title：Magnetic resonance imaging

authors： Gustard S,Williams EJ,Hall LD,Pickard JD,Carpenter TA

更新日期：2003-07-01 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：: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：:White matter loss, ventricular enlargement and white matter lesions are common findings on brain scans of older subjects. Accurate assessment of these different features is therefore essential for normal aging research. Recently, we developed a novel unsupervised classification method, named 'Multispectral Coloring Mo...

journal_title：Magnetic resonance imaging

authors： Valdés Hernández Mdel C,Gallacher PJ,Bastin ME,Royle NA,Maniega SM,Deary IJ,Wardlaw JM

更新日期：2012-02-01 00:00:00

abstract：:We studied the effect of hydralazine on tumor blood volume fraction and microvascular random flow velocity magnitude by IVIM weighted MRI in conjunction with dynamic Gd-DTPA-Albumin enhanced MRI. Blood volume fraction maps were obtained from the dynamic Gd-DTPA-Albumin enhanced MRI measurements. The average blood volu...

journal_title：Magnetic resonance imaging

authors： Wang Z,Su MY,Najafi A,Nalcioglu O

更新日期：2001-10-01 00:00:00

abstract：:We compared the efficacy of rapidly acquired magnetization prepared gradient-echo (MP-GRE) sequences with CT and standard MRI pulse sequences for the detection of focal liver lesions. Fourteen patients with 28 focal liver lesions were scanned. TI times of 300, 450, and 600 ms were used. MP-GRE lesion conspicuity was c...

journal_title：Magnetic resonance imaging

authors： Winter TC 3rd,Freeny PC,Nghiem HV,Thomas CR Jr

更新日期：1994-01-01 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：:Increasing scientific interest in the zebrafish as a model organism across a range of biomedical and biological research areas raises the need for the development of in vivo imaging tools appropriate to this subject. Development of the embryonic and early stage forms of the subject can currently be assessed using opti...

journal_title：Magnetic resonance imaging

authors： Merrifield GD,Mullin J,Gallagher L,Tucker C,Jansen MA,Denvir M,Holmes WM

更新日期：2017-04-01 00:00:00

abstract：:Multi-echo pulse sequences for producing T2-weighted images in much reduced imaging times have recently been developed for routine clinical use. A number of recent articles have described the contrast obtained with fast spin-echo (FSE) sequences and have generally indicated that they depict tissues very similarly to c...

journal_title：Magnetic resonance imaging

authors： Constable RT,Anderson AW,Zhong J,Gore JC

更新日期：1992-01-01 00:00:00

abstract：:Changes in both blood flow and blood oxygenation determine the functional MRI (fMRI) signal. In the present study factors responsible for blood oxygenation (e.g., FiO(2)) were held constant so that changes in pixel count would above all reflect changes in regional cerebral blood flow (rCBF). Continuous positive airway...

journal_title：Magnetic resonance imaging

authors： Lorenz IH,Kolbitsch C,Hörmann C,Schocke M,Kremser C,Zschiegner F,Felber S,Benzer A

更新日期：2001-01-01 00:00:00

abstract：:The mapping of the human brain white matter fiber networks relative to deep subcortical and cortical gray matter requires high spatial resolution which is challenged by the low signal-to-noise ratio. The purpose of this short report was to introduce a whole brain high spatial resolution diffusion tensor imaging (DTI) ...

journal_title：Magnetic resonance imaging

authors： Hasan KM,Kamali A,Kramer LA

更新日期：2009-06-01 00:00:00

abstract：:The intraductal papillary-mucinous neoplasm (IPMN) is the rarest of the cystic pancreatic tumors. Endoscopic retrograde cholangiopancreatography (ERCP) is currently the gold standard for evaluating IPMN's and can demonstrate dilatation of the main duct or side branches, mural nodules, filling defects, and communicatio...

journal_title：Magnetic resonance imaging

authors： Peters HE,Vitellas KM

更新日期：2001-10-01 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：:Most modern techniques for functional magnetic resonance imaging (fMRI) rely on blood-oxygen-level-dependent (BOLD) contrast as the basic principle for detecting neuronal activation. However, the measured BOLD effect depends on a transfer function related to neurophysiological changes accompanying electrical neural ac...

journal_title：Magnetic resonance imaging

authors： Casciaro S,Bianco R,Distante A

更新日期：2008-11-01 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：OBJECTIVE:The purpose of this study was to analyze flow patterns in the pulmonary circulation of healthy volunteers by using 4D flow magnetic resonance imaging. MATERIALS AND METHODS:The study was approved by the local ethics committee and all subjects gave written informed consent. Eighteen volunteers underwent a 4D ...

journal_title：Magnetic resonance imaging

authors： Bächler P,Pinochet N,Sotelo J,Crelier G,Irarrazaval P,Tejos C,Uribe S

更新日期：2013-02-01 00:00:00

abstract：:It is a big challenge to segment magnetic resonance (MR) images with intensity inhomogeneity. The widely used segmentation algorithms are region based, which mostly rely on the intensity homogeneity, and could bring inaccurate results. In this paper, we propose a novel region-based active contour model in a variationa...

journal_title：Magnetic resonance imaging

authors： Liu L,Zhang Q,Wu M,Li W,Shang F

更新日期：2013-05-01 00:00:00