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：: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：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：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：:In this work, magnetic resonance imaging (MRI) was employed to observe the in-situ formation and dissociation of methane hydrates in porous media. Methane hydrate was formed in a high-pressure cell with controlled temperature, and then the hydrate was dissociated by thermal injection. The process was photographed by t...

journal_title：Magnetic resonance imaging

authors： Zhao J,Lv Q,Li Y,Yang M,Liu W,Yao L,Wang S,Zhang Y,Song Y

更新日期：2015-05-01 00:00:00

abstract：:Spatial normalization plays a key role in voxel-based analyses of brain images. We propose a highly accurate algorithm for high-dimensional spatial normalization of brain images based on the technique of symmetric optical flow. We first construct a three dimension optical model with the consistency assumption of inten...

journal_title：Magnetic resonance imaging

authors： Wen Y,Hou L,He L,Peterson BS,Xu D

更新日期：2015-05-01 00:00:00

abstract：:In this retrospective study we tested the hypothesis that the net effect of impaired electrical conduction and therefore increased heat dissipation in multiple sclerosis (MS) results in elevated lateral ventricular (LV) cerebrospinal fluid (CSF) diffusivity as a measure of brain temperature estimated in vivo using dif...

journal_title：Magnetic resonance imaging

authors： Hasan KM,Lincoln JA,Nelson FM,Wolinsky JS,Narayana PA

更新日期：2015-04-01 00:00:00

abstract：PURPOSE:To determine the diagnostic performance of diffusion-weighted MRI and MR volumetry for the assessment of tumor response after preoperative chemoradiotherapy (CRT) in patients with locally advanced rectal cancer. MATERIALS AND METHODS:Forty-three patients with rectal cancer who underwent preoperative CRT were p...

journal_title：Magnetic resonance imaging

authors： Birlik B,Obuz F,Elibol FD,Celik AO,Sokmen S,Terzi C,Sagol O,Sarioglu S,Gorken I,Oztop I

更新日期：2015-02-01 00:00:00

abstract：INTRODUCTION:Recent animal and human epidemiological studies suggest that early childhood exposure to anesthesia may have adverse effects on brain development. As more than 50% of pregnant women in the United States and one-third in the United Kingdom receive regional anesthesia during labor and delivery, understanding...

journal_title：Magnetic resonance imaging

authors： Spann MN,Serino D,Bansal R,Hao X,Nati G,Toth Z,Walsh K,Chiang IC,Sanchez-Peña J,Liu J,Kangarlu A,Liu F,Duan Y,Shova S,Fried J,Tau GZ,Rosen TS,Peterson BS

更新日期：2015-02-01 00:00:00

abstract：:The increasing size and number of data sets of large four dimensional (three spatial, one temporal) magnetic resonance (MR) cardiac images necessitates efficient segmentation algorithms. Analysis of phase-contrast MR images yields cardiac flow information which can be manipulated to produce accurate segmentations of t...

journal_title：Magnetic resonance imaging

authors： Bergen RV,Lin HY,Alexander ME,Bidinosti CP

更新日期：2015-01-01 00:00:00

abstract：:To demonstrate the feasibility of a novel MR elastography (MRE) technique based on a conventional gradient-echo type multi-echo MR sequence which does not need additional bipolar magnetic field gradients (motion encoding gradient: MEG), yet is sensitive to vibration. In a gradient-echo type multi-echo MR sequence, sev...

journal_title：Magnetic resonance imaging

authors： Numano T,Mizuhara K,Hata J,Washio T,Homma K

更新日期：2015-01-01 00:00:00

abstract：PURPOSE:Diffusional kurtosis imaging (DKI) is sensitive to the effects of signal noise due to strong diffusion weightings and higher order modeling of the diffusion weighted signal. A simple noise correction scheme is proposed to remove the majority of the noise bias in the estimated diffusional kurtosis. METHODS:Weig...

journal_title：Magnetic resonance imaging

authors： Glenn GR,Tabesh A,Jensen JH

更新日期：2015-01-01 00:00:00

abstract：:Quantitative MRI of neuromelanin (NM) containing structures (referred to as NM-MRI) in the brainstem, namely the locus coeruleus (LC) and substantia nigra (SN), may assist with the early detection of Parkinson's disease (PD) and Alzheimer's disease (AD) as well as differential diagnosis in the early disease stages. In...

journal_title：Magnetic resonance imaging

authors： Chen X,Huddleston DE,Langley J,Ahn S,Barnum CJ,Factor SA,Levey AI,Hu X

更新日期：2014-12-01 00:00:00

abstract：OBJECTIVE:3D Time-of-flight (TOF) magnetic resonance angiography is commonly used for vascular analyses. A quantification of longitudinal morphological changes usually requires the registration of TOF image sequences acquired at different time points. The aim of this study was to evaluate the precision of different 3D ...

journal_title：Magnetic resonance imaging

authors： Verleger T,Schönfeld M,Säring D,Siemonsen S,Fiehler J,Forkert ND

更新日期：2014-12-01 00:00:00

abstract：:Multi-contrast magnetic resonance imaging (MRI) is a useful technique to aid clinical diagnosis. This paper proposes an efficient algorithm to jointly reconstruct multiple T1/T2-weighted images of the same anatomical cross section from partially sampled k-space data. The joint reconstruction problem is formulated as m...

journal_title：Magnetic resonance imaging

authors： Huang J,Chen C,Axel L

更新日期：2014-12-01 00:00:00

abstract：:Functional T1ρ mapping has been proposed as a method to assess pH and metabolism dynamics in the brain with high spatial and temporal resolution. The purpose of this work is to describe and evaluate a variant of the spin-locked echo-planar imaging sequence for functional T1ρ mapping at 3T. The proposed sequence rapidl...

journal_title：Magnetic resonance imaging

authors： Johnson CP,Heo HY,Thedens DR,Wemmie JA,Magnotta VA

更新日期：2014-11-01 00:00:00

abstract：:The purpose of this study was to evaluate a magnetic resonance imaging (MRI) technique for quantifying the proton density water fraction (PDWF) as a biomarker of bone marrow cellularity. Thirty-six human bone marrow specimens from 18 donors were excised and subjected to different measurements of tissue composition: PD...

journal_title：Magnetic resonance imaging

authors： MacEwan IJ,Glembotski NE,D'Lima D,Bae W,Masuda K,Rashidi HH,Mell LK,Bydder M

更新日期：2014-11-01 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：:The adiabatic Shinnar-Le Roux (SLR) algorithm for radiofrequency (RF) pulse design enables systematic control of pulse parameters such as bandwidth, RF energy distribution and duration. Some applications, such as diffusion-weighted imaging (DWI) at high magnetic fields, would benefit from RF pulses that can provide gr...

journal_title：Magnetic resonance imaging

authors： Balchandani P,Qiu D

更新日期：2014-09-01 00:00:00

abstract：:Increased bone water content resulting from repetitive patellofemoral joint overloading has been suggested to be a possible mechanism underlying patellofemoral pain (PFP). To date, it remains unknown whether persons with PFP exhibit elevated bone water content. The purpose of this study was to determine whether recrea...

journal_title：Magnetic resonance imaging

authors： Ho KY,Hu HH,Colletti PM,Powers CM

更新日期：2014-09-01 00:00:00

abstract：PURPOSE:To compare the diagnostic performance of the noncontrast MRI including DWI to the standard MRI for detecting hepatic malignancies in patients with chronic liver disease. MATERIALS AND METHODS:We included 135 patients with 136 histologically-confirmed hepatocellular carcinomas (HCCs), 12 cholangiocarcinomas, an...

journal_title：Magnetic resonance imaging

authors： Kim YK,Kim YK,Park HJ,Park MJ,Lee WJ,Choi D

更新日期：2014-07-01 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：PURPOSE:Although functional magnetic resonance imaging (fMRI) has revealed that spinal cord injury (SCI) causes anomalous changes in task-induced brain activation, its effect during the resting state remains unclear. The aim of this study is to explore the changes of the brain resting-state function in non-human primat...

journal_title：Magnetic resonance imaging

authors： Rao JS,Ma M,Zhao C,Zhang AF,Yang ZY,Liu Z,Li XG

更新日期：2014-06-01 00:00:00

abstract：:The present trend in dynamic contrast-enhanced MRI is to increase the number of estimated perfusion parameters using complex pharmacokinetic models. However, less attention is given to the precision analysis of the parameter estimates. In this paper, the distributed capillary adiabatic tissue homogeneity pharmacokinet...

journal_title：Magnetic resonance imaging

authors： Bartoš M,Jiřík R,Kratochvíla J,Standara M,Starčuk Z Jr,Taxt T

更新日期：2014-06-01 00:00:00

abstract：PURPOSE:To describe the patterns of bile distribution in the biliary tree, duodenum, jejunum, and stomach, and to determine the gallbladder ejection fraction (GBEF) by using functional magnetic resonance cholangiography (MRC) with gadolinium-ethoxybenzyl-diethylenetriamine penta-acetic acid (Gd-EOB-DTPA) in healthy vol...

journal_title：Magnetic resonance imaging

authors： Lee SW,Cha SH,Chung HH,Kim KH,Yeom SK,Seo BK,Je BK,Kim BH

更新日期：2014-05-01 00:00:00

abstract：PURPOSE:To evaluate the use of the double-echo steady-state (DESS) sequence for acquiring high-resolution breast images with diffusion and T2 weighting. MATERIALS AND METHODS:Phantom scans were used to verify the T2 and diffusion weighting of the DESS sequence. Image distortion was evaluated in volunteers by comparing...

journal_title：Magnetic resonance imaging

authors： Granlund KL,Staroswiecki E,Alley MT,Daniel BL,Hargreaves BA

更新日期：2014-05-01 00:00:00

abstract：:In ultrashort TE (UTE) imaging, the short T2 values of the tissues of interest are comparable to the k-space readout duration, which result in significant T2 decay during k-space readout. This decay consequently causes significant effects on signal and contrast in UTE sequences, which we evaluate in this paper using m...

journal_title：Magnetic resonance imaging

authors： Chiang JT,Carl M,Du J

更新日期：2014-04-01 00:00:00

abstract：OBJECTIVE:Equivalent cross-relaxation rate imaging (ECRI) is an MRI technique used to evaluate qualitative changes in protein-water interactions. We aimed to prospectively evaluate the utility of ECRI for classification of adipocytic tumors. MATERIALS AND METHODS:Institutional Review Board approval was obtained and al...

journal_title：Magnetic resonance imaging

authors： Okuda H,Matsushima S,Sugiura H,Yamada K,Hamada S,Nishida Y,Ishiguro N

更新日期：2014-04-01 00:00:00

abstract：BACKGROUND AND PURPOSE:Diffusion MRI characteristics have been used as biomarkers to guide prognosis in cerebral pathologies including brain metastases. The measurement of ADC is often described poorly in clinical and research studies with little detail given to the practical considerations of where to place ROIs, whic...

journal_title：Magnetic resonance imaging

authors： Zakaria R,Das K,Bhojak M,Radon M,Sluming V,Walker C,Jenkinson MD

更新日期：2014-04-01 00:00:00

abstract：:Renal transplant patients often require imaging to ensure appropriate graft placement, to assess integrity of transplant vessel anastomosis and to evaluate for stenosis that can be a cause of graft failure. Because there is risk for nephrogenic systemic fibrosis in the setting of renal insufficiency, the use of non-co...

journal_title：Magnetic resonance imaging

authors： Bultman EM,Klaers J,Johnson KM,François CJ,Schiebler ML,Reeder SB,Block WF

更新日期：2014-02-01 00:00:00

abstract：:Glycosaminoglycan Chemical Exchange Saturation Transfer (gagCEST) is an important molecular MRI methodology developed to assess changes in cartilage GAG concentrations. The correction for B0 field inhomogeneity is technically crucial in gagCEST imaging. This study evaluates the accuracy of the B0 estimation determined...

journal_title：Magnetic resonance imaging

authors： Wei W,Jia G,Flanigan D,Zhou J,Knopp MV

更新日期：2014-01-01 00:00:00

abstract：:Water content is the dominant chemical compound in the brain and it is the primary determinant of tissue contrast in magnetic resonance (MR) images. Water content varies greatly between individuals, and it changes dramatically over time from birth through senescence of the human life span. We hypothesize that the effe...

journal_title：Magnetic resonance imaging

authors： Bansal R,Hao X,Liu F,Xu D,Liu J,Peterson BS

更新日期：2013-12-01 00:00:00

abstract：:The purpose of this study is to report the significant differences found in the identification of lesions in cervical spinal cord of two patients with multiple sclerosis when using the BLADE T2-TSE and BLADE T2-TIRM sequences as opposed to the conventional T2-TSE and T2-TIRM sequences for sagittal acquisition at 1.5T....

journal_title：Magnetic resonance imaging

authors： Lavdas E,Mavroidis P,Topaltzikis T,Slatinopoulos V,Roka V,Vlachopoulou A,Papanikolaou N,Stathakis S,Kapsalaki E,Batsikas G

更新日期：2013-12-01 00:00:00

abstract：:An efficient method for obtaining longitudinal relaxation time (T1) maps is based on acquiring two spoiled gradient recalled echo (SPGR) images in steady states with different flip angles, which has also been extended, with additional acquisitions, to obtain a tissue water content (M0) map. Several factors, including ...

journal_title：Magnetic resonance imaging

authors： Sabati M,Maudsley AA

更新日期：2013-12-01 00:00:00

abstract：PURPOSE:To evaluate whether semi-quantitative analysis of high temporal resolution dynamic contrast-enhanced MRI (DCE-MRI) acquired early in treatment can predict the response of locally advanced breast cancer (LABC) to neoadjuvant chemotherapy (NAC). MATERIALS AND METHODS:As part of an IRB-approved prospective study,...

journal_title：Magnetic resonance imaging

authors： Abramson RG,Li X,Hoyt TL,Su PF,Arlinghaus LR,Wilson KJ,Abramson VG,Chakravarthy AB,Yankeelov TE

更新日期：2013-11-01 00:00:00

abstract：OBJECT:Quantitative T2 measurement is applied in cardiac Magnetic Resonance Imaging (MRI) for the diagnosis and follow-up of myocardial pathologies. Standard Electrocardiogram (ECG)-gated fast spin echo pulse sequences can be used clinically for T2 assessment, with multiple breath-holds. However, heart rate is subject ...

journal_title：Magnetic resonance imaging

authors： de Roquefeuil M,Vuissoz PA,Escanyé JM,Felblinger J

更新日期：2013-11-01 00:00:00

abstract：:The purpose of this study was to analyze background parenchymal enhancement (BPE) in the contralateral normal breast of cancer patients during the course of neoadjuvant chemotherapy (NAC). Forty-five subjects were analyzed. Each patient had three MRIs, one baseline (B/L) and two follow-up (F/U) studies. The fibrogland...

journal_title：Magnetic resonance imaging

authors： Chen JH,Yu H,Lin M,Mehta RS,Su MY

更新日期：2013-11-01 00:00:00

abstract：OBJECTIVE:The pathological changes in Parkinson disease begin in the brainstem; reach the limbic system and ultimately spread to the cerebral cortex. In Parkinson disease (PD) patients, we evaluated the alteration of cingulate fibers, which comprise part of the limbic system, by using diffusional kurtosis imaging (DKI)...

journal_title：Magnetic resonance imaging

authors： Kamagata K,Tomiyama H,Motoi Y,Kano M,Abe O,Ito K,Shimoji K,Suzuki M,Hori M,Nakanishi A,Kuwatsuru R,Sasai K,Aoki S,Hattori N

更新日期：2013-11-01 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：PURPOSE:This study aimed to further investigate the effects of agmatine on brain edema in the rats with middle cerebral artery occlusion (MCAO) injury using magnetic resonance imaging (MRI) monitoring and biochemical and histopathologic evaluation. MATERIALS AND METHODS:Following surgical induction of MCAO for 90min, ...

journal_title：Magnetic resonance imaging

authors： Huang YC,Tzeng WS,Wang CC,Cheng BC,Chang YK,Chen HH,Lin PC,Huang TY,Chuang TJ,Lin JW,Chang CP

更新日期：2013-09-01 00:00:00