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：:In porous material research, one main interest of nuclear magnetic resonance diffusion (NMR) experiments is the determination of the shape of pores. While it has been a longstanding question if this is in principle achievable, it has been shown recently that it is indeed possible to perform NMR-based diffusion pore im...

journal_title：Magnetic resonance imaging

authors： Laun FB,Kuder TA

更新日期：2013-09-01 00:00:00

abstract：:The objective of this study was to analyze regional variations of magnetic resonance (MR) relaxation times (T1ρ and T2) in hip joint cartilage of healthy volunteers and subjects with femoral acetabular impingement (FAI). Morphological and quantitative images of the hip joints of 12 healthy volunteers and 9 FAI patient...

journal_title：Magnetic resonance imaging

authors： Subburaj K,Valentinitsch A,Dillon AB,Joseph GB,Li X,Link TM,Vail TP,Majumdar S

更新日期：2013-09-01 00:00:00

abstract：:Localized high-resolution diffusion tensor images (DTI) from the midbrain were obtained using reduced field-of-view (rFOV) methods combined with SENSE parallel imaging and single-shot echo planar (EPI) acquisitions at 7T. This combination aimed to diminish sensitivities of DTI to motion, susceptibility variations, and...

journal_title：Magnetic resonance imaging

authors： Wargo CJ,Gore JC

更新日期：2013-07-01 00:00:00

abstract：:We report the first application of a novel diffusion-based MRI method, called diffusional kurtosis imaging (DKI), to investigate changes in brain tissue microstructure in patients with mild cognitive impairment (MCI) and AD and in cognitively intact controls. The subject groups were characterized and compared in terms...

journal_title：Magnetic resonance imaging

authors： Falangola MF,Jensen JH,Tabesh A,Hu C,Deardorff RL,Babb JS,Ferris S,Helpern JA

更新日期：2013-07-01 00:00:00

abstract：PURPOSE:To present preliminary, in vivo temperature measurements during MRI of a pig implanted with a deep brain stimulation (DBS) system. MATERIALS AND METHODS:DBS system (Medtronic Inc., Minneapolis, MN) was implanted in the brain of an anesthetized pig. 3.0-T MRI was performed with a T/R head coil using the low-SAR...

journal_title：Magnetic resonance imaging

authors： Gorny KR,Presti MF,Goerss SJ,Hwang SC,Jang DP,Kim I,Min HK,Shu Y,Favazza CP,Lee KH,Bernstein MA

更新日期：2013-06-01 00:00:00

abstract：BACKGROUND:Since the advent of magnetic resonance imaging, metal artifacts have posed an important diagnostic problem in different fields of medicine. However, this has not been systematically studied in patients undergoing surgery for brain tumors. OBJECTIVE:This study was planned to assess whether metal artifacts ca...

journal_title：Magnetic resonance imaging

authors： Bagheri MH,Ahmadloo N,Rezaian S

更新日期：2013-06-01 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

abstract：PURPOSE:Time-of-flight (ToF) and phase contrast (PC) magnetic resonance angiographies (MRAs) are noninvasive applications to depict the cerebral arteries. Both approaches can image the cerebral vasculature without the administration of intravenous contrast. Therefore, it is used in routine clinical evaluation of cerebr...

journal_title：Magnetic resonance imaging

authors： Stamm AC,Wright CL,Knopp MV,Schmalbrock P,Heverhagen JT

更新日期：2013-05-01 00:00:00

abstract：:Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is often used to examine vascular function in malignant tumors and noninvasively monitor drug efficacy of antivascular therapies in clinical studies. However, complex numerical methods used to derive tumor physiological properties from DCE-MRI images can b...

journal_title：Magnetic resonance imaging

authors： Hsu YH,Ferl GZ,Ng CM

更新日期：2013-05-01 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：:Resting fluctuations in arterial CO2 (a cerebral vasodilator) are believed to be an important source of low-frequency blood oxygenation level dependent (BOLD) signal fluctuations. In this study we focus on the two commonly used resting-states in functional magnetic resonance imaging experiments, eyes open and eyes clo...

journal_title：Magnetic resonance imaging

authors： Peng T,Niazy R,Payne SJ,Wise RG

更新日期：2013-04-01 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：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：:Within the magnetic resonance imaging (MRI) community the trend is going to higher and higher magnetic fields, ranging from 1.5 T to 7 T, corresponding to Larmor frequencies of 63.8-298 MHz. Since for high-field MRI the magnetization increases with the applied magnetic field, the signal-to-noise-ratio increases as wel...

journal_title：Magnetic resonance imaging

authors： Hilschenz I,Körber R,Scheer HJ,Fedele T,Albrecht HH,Mario Cassará A,Hartwig S,Trahms L,Haase J,Burghoff M

更新日期：2013-02-01 00:00:00

abstract：:Metabolic imaging of hyperpolarized [1-(13)C] pyruvate co-polarized with [(13)C]urea by dynamic nuclear polarization with rapid dissolution is a promising new method for assessing tumor metabolism and perfusion simultaneously in vivo. Novel pulse sequences are required to enable dynamic imaging of multiple (13)C spect...

journal_title：Magnetic resonance imaging

authors： von Morze C,Sukumar S,Reed GD,Larson PE,Bok RA,Kurhanewicz J,Vigneron DB

更新日期：2013-02-01 00:00:00

abstract：:The aim of this work is to present and evaluate a level-set segmentation approach with vesselness-dependent anisotropic energy weights, which focuses on the exact segmentation of malformed as well as small vessels from time-of-flight (TOF) magnetic resonance angiography (MRA) datasets. In a first step, a vesselness fi...

journal_title：Magnetic resonance imaging

authors： Forkert ND,Schmidt-Richberg A,Fiehler J,Illies T,Möller D,Säring D,Handels H,Ehrhardt J

更新日期：2013-02-01 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

abstract：:The aim of the study was to evaluate the relationship between the presence of right ventricular abnormalities detected by cardiac magnetic resonance (CMR) and QRS dispersion, the strongest independent predictor of sudden death in ARVC. A consecutive series of 40 patients from a single institution were recruited with a...

journal_title：Magnetic resonance imaging

authors： Ma N,Cheng H,Lu M,Jiang S,Yin G,Zhao S

更新日期：2012-12-01 00:00:00

abstract：PURPOSE:To assess the sensitivity and specificity of intra-plaque hemorrhage (IPH), large lipid-rich necrotic core (LR-NC) and ulceration or cap rupture (UCR) for symptomatic carotid plaque characterization and to evaluate a new imaging score [Hemorrhage, Ulceration or cap rupture, Lipid-rich necrotic Core (HULC) score...

journal_title：Magnetic resonance imaging

authors： Gury-Paquet L,Millon A,Salami F,Cernicanu A,Scoazec JY,Douek P,Boussel L

更新日期：2012-12-01 00:00:00

abstract：:Quantitative analysis has tremendous but mostly unrealized potential in healthcare to support objective and accurate interpretation of the clinical imaging. In 2008, the National Cancer Institute began building the Quantitative Imaging Network (QIN) initiative with the goal of advancing quantitative imaging in the con...

journal_title：Magnetic resonance imaging

authors： Fedorov A,Beichel R,Kalpathy-Cramer J,Finet J,Fillion-Robin JC,Pujol S,Bauer C,Jennings D,Fennessy F,Sonka M,Buatti J,Aylward S,Miller JV,Pieper S,Kikinis R

更新日期：2012-11-01 00:00:00

abstract：:With the recent development of integrated positron emission tomography-magnetic resonance imaging (PET-MRI) scanners, new possibilities for quantitative molecular imaging of cancer are realized. However, the practical advantages and potential clinical benefits of the ability to record PET and MRI data simultaneously m...

journal_title：Magnetic resonance imaging

authors： Yankeelov TE,Peterson TE,Abramson RG,Izquierdo-Garcia D,Arlinghaus LR,Li X,Atuegwu NC,Catana C,Manning HC,Fayad ZA,Gore JC

更新日期：2012-11-01 00:00:00

abstract：:High-resolution magnetic resonance imaging using dedicated high-field radiofrequency micro-coils at 16.4 T (700 MHz) was investigated. Specific solenoid coils primarily using silver and copper as conductors with enamel and polyurethane coatings were built to establish which coil configuration produces the best image. ...

journal_title：Magnetic resonance imaging

authors： Vegh V,Gläser P,Maillet D,Cowin GJ,Reutens DC

更新日期：2012-10-01 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：:Cross-terms between imaging and diffusion gradients, unaccounted for during tensor calculations, can lead to erroneous estimation of diffusivity and fractional anisotropy (FA) in regions of isotropic and anisotropic diffusion. Cross-term of magnitude 136.8±1.6 s/mm(2), artificially introduced in the slice-encode direc...

journal_title：Magnetic resonance imaging

authors： Nair G,Hu XP

更新日期：2012-07-01 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：PURPOSE:The purpose was to study the effect of estrogen deficiency on contrast agent diffusion into intervertebral disc in a rat model. MATERIALS AND METHODS:Seven-month-old female Sprague-Dawley rats were used. Fourteen rats had ovariectomy, and nine rats had sham surgery. Magnetic resonance imaging (MRI) of sagittal...

journal_title：Magnetic resonance imaging

authors： Deng M,Griffith JF,Zhu XM,Poon WS,Ahuja AT,Wang YX

更新日期：2012-06-01 00:00:00

abstract：BACKGROUND:The diagnosis and management of mild traumatic brain injury (MTBI) continue to be subjects of debate, with varying opinions regarding the extent to which tissue-based impairments versus the impacts of other stressors cause ongoing disability. Detecting areas of the brain with abnormalities that can explain s...

journal_title：Magnetic resonance imaging

authors： Kasahara K,Hashimoto K,Abo M,Senoo A

更新日期：2012-05-01 00:00:00

abstract：:Diffusion tensor imaging (DTI) constitutes the most used paradigm among the diffusion-weighted magnetic resonance imaging (DW-MRI) techniques due to its simplicity and application potential. Recently, real-time estimation in DW-MRI has deserved special attention, with several proposals aiming at the estimation of mean...

journal_title：Magnetic resonance imaging

authors： Casaseca-de-la-Higuera P,Tristán-Vega A,Aja-Fernández S,Alberola-López C,Westin CF,San José Estépar R

更新日期：2012-05-01 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：:To acquire high-resolution T(1)-weighted images of the liver in rats, for which breath-holding cannot be ensured, respiratory triggering is essential. At the respiratory rate of 30-60 times/min in rats, however, T(1)-weighted images cannot be obtained with simple triggering. As a simple solution to this, we applied mu...

journal_title：Magnetic resonance imaging

authors： Morikawa S,Murayama H,Fujimoto S,Shiino A,Inubushi T

更新日期：2012-04-01 00:00:00

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：:Acetaminophen (APAP) toxicity is responsible for approximately half of all cases of acute liver failure in the United States. The mouse model of APAP toxicity is widely used to examine mechanisms of APAP toxicity. Noninvasive approaches would allow for serial measurements in a single animal to study the effects of exp...

journal_title：Magnetic resonance imaging

authors： Brown AT,Ou X,James LP,Jambhekar K,Pandey T,McCullough S,Chaudhuri S,Borrelli MJ

更新日期：2012-02-01 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：: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：:The purpose of this study was to evaluate the effect of gadoxetic acid (Gd-EOB-DTPA) on measurements of liver stiffness by using magnetic resonance elastography (MRE). In this study, 104 consecutive patients (mean age, 67.7±9.4 years) underwent MRE using a 1.5-T MR scanner equipped with a cylindrical passive driver th...

journal_title：Magnetic resonance imaging

authors： Motosugi U,Ichikawa T,Sou H,Sano K,Muhi A,Ehman RL,Araki T

更新日期：2012-01-01 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：: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：:Glutamate plays a double role in (13)C-nuclear magnetic resonance (NMR) spectroscopic determination of glucose metabolism in the brain. Bidirectional exchange between initially unlabeled glutamate and labeled α-ketoglutarate, formed from pyruvate via pyruvate dehydrogenase (PDH), indicates the rate of energy metabolis...

journal_title：Magnetic resonance imaging

authors： Hertz L

更新日期：2011-12-01 00:00:00

abstract：:Respiratory motion and capnometry monitoring were performed during blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI) of the brain while a series of paced hyperventilation tasks were performed that caused significant hypocapnia. Respiration volume per time (RVT) and end-tidal carbon dioxi...

journal_title：Magnetic resonance imaging

authors： Vogt KM,Ibinson JW,Schmalbrock P,Small RH

更新日期：2011-11-01 00:00:00