Quantitative longitudinal fluid saturation profiles with a slice-selected CPMG sequence.

abstract：BACKGROUND:Blood-oxygen-level-dependent (BOLD) magnetic resonance imaging (MRI) can provide regional measurements of oxygen content using deoxyhemoglobin paramagnetic characteristics. The apparent relaxation rate or R2*(=1/T2*) can be determined from the slope of log (intensity) versus echo time and is directly proport...

journal_title：Magnetic resonance imaging

authors： Xin-Long P,Jing-Xia X,Jian-Yu L,Song W,Xin-Kui T

更新日期：2012-04-01 00:00:00

abstract：:Magnetic resonance elastography (MRE) uses a phase-contrast MRI technique to image shear wave propagation in tissue followed by the mathematical inversion of the equations of motion governing tissue mechanics to noninvasively image tissue stiffness. This work investigates the impact of various MR sampling strategies d...

journal_title：Magnetic resonance imaging

authors： Murphy MC,Glaser KJ,Manduca A,Felmlee JP,Huston J 3rd,Ehman RL

更新日期：2010-12-01 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：:Perfusion magnetic resonance imaging (MRI) is a promising non-invasive technique providing insights regarding the brain's microvascular architecture in vivo. The scalar perfusion metrics can be used for quantitative diagnostics of various brain abnormalities, in particular, in the stroke cases and tumours. However, co...

journal_title：Magnetic resonance imaging

authors： Maximov II,Vellmer S

更新日期：2019-04-01 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：:A new approach to solid-state imaging (SSI) is presented. The method relies on narrowing the resonance line using the Lee-Goldburg sequence. The technique is easy to implement in practice and may find widespread applications in materials science. ...

journal_title：Magnetic resonance imaging

authors： De Luca F,Lugeri N,De Simone BC,Maraviglia B

更新日期：1992-01-01 00:00:00

abstract：:This study describes the appearance of Brenner tumors on MR imaging and compares quantitative signal intensity measurements of Brenner tumors with that of other ovarian tumors. A search of pathologic and MR records disclosed patients who had MRIs showing Brenner tumors prior to surgical excision. Patients (21) with ot...

journal_title：Magnetic resonance imaging

authors： Outwater EK,Siegelman ES,Kim B,Chiowanich P,Blasbalg R,Kilger A

更新日期：1998-12-01 00:00:00

abstract：PURPOSE:To develop a free-running framework for 3D isotropic simultaneous myocardial T1/T2 mapping and cine imaging. METHODS:Continuous data acquisition with 3D golden angle radial trajectory is used in conjunction with T2 preparation of varying echo times and inversion recovery (IR) pulses to enable simultaneous myoc...

journal_title：Magnetic resonance imaging

authors： Qi H,Bustin A,Cruz G,Jaubert O,Chen H,Botnar RM,Prieto C

更新日期：2019-11-01 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：:The biodistribution and relative molar effectiveness of the ionic (GdCl3) and chelated (Gd-DTPA) forms of gadolinium (Gd) to enhance proton relaxation rates in rat kidney, liver and spleen were evaluated. Rats were given intravenous injections of either GdCl3 (100 mumol/kg) or Gd-DTPA (178 mumol/kg). Gd-DTPA was prima...

journal_title：Magnetic resonance imaging

authors： Barnhart JL,Kuhnert N,Bakan DA,Berk RN

更新日期：1987-01-01 00:00:00

abstract：:The subthalamic nucleus (STN) is one of the most common stimulation targets for treating Parkinson's disease using deep brain stimulation (DBS). This procedure requires precise placement of the stimulating electrode. Common practice of DBS implantation utilizes microelectrode recording to locate the sites with the cor...

journal_title：Magnetic resonance imaging

authors： Xiao Y,Beriault S,Pike GB,Collins DL

更新日期：2012-06-01 00:00:00

abstract：OBJECTIVE:To develop and validate a large field of view phantom and quality assurance software tool for the assessment and characterization of geometric distortion in MRI scanners commissioned for radiation therapy planning. MATERIALS AND METHODS:A purpose built phantom was developed consisting of 357 rods (6mm in dia...

journal_title：Magnetic resonance imaging

authors： Torfeh T,Hammoud R,McGarry M,Al-Hammadi N,Perkins G

更新日期：2015-09-01 00:00:00

abstract：:Fifteen patients with liver cirrhosis and two control groups were examined. The first control group consisted of 7 healthy volunteers, and the second group of 17 patients with nonfocal liver diseases. The T1 and T2 relaxation times were calculated from signal intensities read out from a region of interest centrally lo...

journal_title：Magnetic resonance imaging

authors： Thomsen C,Christoffersen P,Henriksen O,Juhl E

更新日期：1990-01-01 00:00:00

abstract：:This summary attempts to provide forward-looking concepts regarding gadolinium related toxicity, as discussed in further detail in this issue. ...

journal_title：Magnetic resonance imaging

authors： Semelka RC,Ramalho M,Jay M

更新日期：2016-12-01 00:00:00

abstract：:In vivo spin-lattice relaxation times, T1, of water and lipid protons of normal and atrophic muscles were measured, using the spatially resolved spectroscopy (SPARS) sequence, in a genetic avian model of myopathy. These T1 values were compared with those of the hypertrophic muscles. Although the water T1 values of mus...

journal_title：Magnetic resonance imaging

authors： Misra LK,Narayana PA

更新日期：1989-05-01 00:00:00

abstract：:The role of susceptibility effects in the production of artifacts in chemical shift images generated by the selective excitation technique is discussed. The effects are demonstrated in images of phantom samples of agarose gels containing small air bubbles. The artifacts can lead to erroneous interpretations, in which ...

journal_title：Magnetic resonance imaging

authors： Pope JM,Walker RR,Kron T

更新日期：1992-01-01 00:00:00

abstract：:Radial acquisitions can suffer from trajectory errors leading to reduced image quality. Here we present a new method of trajectory correction that uses all spokes of a radial acquisition and compare it to an existing method that uses a two-spoke pre-scan calibration. For both methods, estimates of the necessary shifts...

journal_title：Magnetic resonance imaging

authors： Buonincontri G,Methner C,Krieg T,Carpenter TA,Sawiak SJ

更新日期：2014-09-01 00:00:00

abstract：:Arterial spin labeling (ASL) perfusion fMRI data differ in important respects from the more familiar blood oxygen level-dependent (BOLD) fMRI data and require specific processing strategies. In this paper, we examined several factors that may influence ASL data analysis, including data storage bit resolution, motion c...

journal_title：Magnetic resonance imaging

authors： Wang Z,Aguirre GK,Rao H,Wang J,Fernández-Seara MA,Childress AR,Detre JA

更新日期：2008-02-01 00:00:00

abstract：:We retrospectively compared the diagnostic accuracy of abdominal ultrasound (US), computed tomography (CT), and magnetic resonance imaging (MRI) studies performed on the same individual to determine the relative performance of these modalities in the evaluation of disease processes, arising from different intra-abdomi...

journal_title：Magnetic resonance imaging

authors： Noone TC,Semelka RC,Chaney DM,Reinhold C

更新日期：2004-01-01 00:00:00

abstract：:The effect of slice orientation on reproducibility and sensitivity of 3T fMRI activation using a motor task has been investigated in six normal volunteers. Four slice orientations were used; axial, oblique axial, coronal and sagittal. We applied analysis of variance (ANOVA) to suprathreshold voxel statistics to quanti...

journal_title：Magnetic resonance imaging

authors： Gustard S,Fadili J,Williams EJ,Hall LD,Carpenter TA,Brett M,Bullmore ET

更新日期：2001-12-01 00:00:00

abstract：:The proton spin-lattice relaxation measured at several frequencies leads to a resolved distribution of four Tli for reactive powder concrete (RPC). The typical Tli frequency dependences are quantitatively interpreted by a biphasic fast exchange model and a proton nuclear relaxation of hydrated paramagnetic ions at the...

journal_title：Magnetic resonance imaging

authors： Philippot S,Korb JP,Petit D,Zanni H

更新日期：1998-06-01 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：INTRODUCTION:Compared to standard arterial-only first-pass MR-angiography (FPMRA), imaging during the equilibrium phase of a blood pool contrast agent (steady state) has been shown to provide higher image quality and better stenosis grading. Homogenous Dixon fat-suppression promises to increase contrast by suppression ...

journal_title：Magnetic resonance imaging

authors： Homsi R,Gieseke J,Kukuk GM,Träber F,Willinek WA,Schild HH,Hadizadeh DR

更新日期：2015-11-01 00:00:00

abstract：:The objective of this study was to describe magnetic resonance (MR) findings with a 1.5T imager for hepatic parenchymal changes after proton beam radiotherapy. Thirty-two patients who received proton radiotherapy with doses of 50-87 Gy underwent MR imaging 1-75 months (mean 22 months) after the start of irradiation. A...

journal_title：Magnetic resonance imaging

authors： Onaya H,Itai Y,Yoshioka H,Ahmadi T,Niitsu M,Okumura T,Akine Y,Matsuzaki Y,Doi M,Tsuji H,Tsujii H

更新日期：2000-07-01 00:00:00

abstract：:Fast gradient echo sequences, such as echo planer imaging (EPI) and spiral imaging, are vulnerable to artifacts resulting from B(0) inhomogeneities. A major contribution to these artifacts is the susceptibility variation across the head, which is most severe in regions adjacent to air-tissue interfaces, such as the mo...

journal_title：Magnetic resonance imaging

authors： Neufeld A,Assaf Y,Graif M,Hendler T,Navon G

更新日期：2005-11-01 00:00:00

abstract：:Recent compressed sensing techniques allow signal acquisition with less sampling than required by the Nyquist-Shannon theorem which reduces the data acquisition time in magnetic resonance imaging (MRI). However, prior knowledge becomes essential to reconstruct detailed features when the sampling rate is exceedingly lo...

journal_title：Magnetic resonance imaging

authors： Zong F,d'Eurydice MN,Galvosas P

更新日期：2016-02-01 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:To establish an optimized sequence design for fast acceleration of arterial spin labeling (ASL)-based time-resolved magnetic resonance angiography (MRA) by acquisition of control and labeled images in the same shot (fast ACTRESS) and a scan time of <1min, for the evaluation of intracranial vessels. MATERIALS A...

journal_title：Magnetic resonance imaging

authors： Sugimori H,Fujima N,Suzuki Y,Hamaguchi H,Ishizaka K,Kudo K

更新日期：2017-11-01 00:00:00

abstract：:Functional MR (fMR) imaging techniques based on blood oxygenation level dependent (BOLD) effects were developed and applied to a rat brain tumor model to evaluate the potential utility of the method for characterizing tumor growth and regression following treatment. Rats bearing 9L brain tumors in situ were imaged dur...

journal_title：Magnetic resonance imaging

authors： Mazurchuk R,Zhou R,Straubinger RM,Chau RI,Grossman Z

更新日期：1999-05-01 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