Wavelet-based characterization of vertebral trabecular bone structure from magnetic resonance images at 3 T compared with micro-computed tomographic measurements.

abstract：INTRODUCTION:Previous investigations of test-retest reliability of cerebral blood flow (CBF) at rest measured with pseudo-continuous Arterial Spin Labeling (pCASL) demonstrated good reliability, but are limited by the use of similar scanner platforms. In the present study we examined test-retest reliability of CBF in r...

journal_title：Magnetic resonance imaging

authors： Almeida JRC,Greenberg T,Lu H,Chase HW,Fournier JC,Cooper CM,Deckersbach T,Adams P,Carmody T,Fava M,Kurian B,McGrath PJ,McInnis MG,Oquendo MA,Parsey R,Weissman M,Trivedi M,Phillips ML

更新日期：2018-01-01 00:00:00

abstract：:Gadolinium DTPA was evaluated as an intravenous contrast agent for magnetic resonance imaging in 15 patients with primary or secondary intracranial neoplastic disease. T1 and T2 weighted images were obtained prior to contrast administration. T1 weighted spin echo 35/800 (TE/TR) images were utilized to detect enhanceme...

journal_title：Magnetic resonance imaging

authors： Runge VM,Schoerner W,Niendorf HP,Laniado M,Koehler D,Claussen C,Felix R,James AE Jr

更新日期：1985-01-01 00:00:00

abstract：:The HASTE (half-Fourier acquisition single-shot turbo spin-echo) technique delivers images with T2-weighting in about half a second and could be ideal for fast dynamic studies when T2-weighting is needed. We evaluated cardiac-triggered HASTE to study cervical spine flexion/extension. The cervical spines of ten asympto...

journal_title：Magnetic resonance imaging

authors： Duerinckx AJ,Yu WD,El-Saden S,Kim D,Wang JC,Sandhu HS

更新日期：1999-04-01 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：:Susceptibility differences are common causes for artifacts in magnetic resonance (MR); therefore, it is important to choose phantom materials in a way that these artifacts are kept at a minimum. In this study, a previously proposed MR imaging (MRI) method [Beuf O, Briguet A, Lissac M, Davis R. Magnetic resonance imagi...

journal_title：Magnetic resonance imaging

authors： Carlsson A,Starck G,Ljungberg M,Ekholm S,Forssell-Aronsson E

更新日期：2006-11-01 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：:The presence of metallic compounds in facial cosmetics and permanent tattoos may affect the quality of magnetic resonance imaging. We report a case study describing a signal artifact due to the use of a leave-on powdered hair dye. On reviewing the ingredients of the product, it was found to contain several metallic co...

journal_title：Magnetic resonance imaging

authors： Chenji S,Wilman AH,Mah D,Seres P,Genge A,Kalra S

更新日期：2017-01-01 00:00:00

abstract：:Several previous 31 phosphorus magnetic resonance spectroscopy ((31)P MRS) studies performing incremental or progressive muscle exercises have observed that a decrease in pH is accompanied with an acceleration in phosphocreatine (PCr) hydrolysis. The purpose of this study was to investigate the relationship between PC...

journal_title：Magnetic resonance imaging

authors： Schocke MF,Esterhammer R,Kammerlander C,Rass A,Kremser C,Fraedrich G,Jaschke WR,Greiner A

更新日期：2004-01-01 00:00:00

abstract：:The hippocampal formation possesses an important role in the development and maintenance of short-term memory. In this study, magnetic resonance imaging (MRI) and gross histology were used to quantify the volume of the hippocampal formation in canines. High resolution MRI, using 1 mm thick slices and an intraplanar re...

journal_title：Magnetic resonance imaging

authors： Vullo T,Deo-Narine V,Stallmeyer MJ,Gomez DG,Cahill PT

更新日期：1996-01-01 00:00:00

abstract：:L-2-Chloropropionic acid (L-CPA) is selectively toxic to rat cerebellar granule cells; necrosis is first observed about 36 hours after administration of L-CPA (750 mg/kg p.o.) becoming more marked by 48 h. Parallel to the onset of cell death an increase in cerebellar water content and sodium concentration has been rep...

journal_title：Magnetic resonance imaging

authors： Williams RE,Prior M,Bachelard HS,Waterton JC,Checkley D,Lock EA

更新日期：2001-02-01 00:00:00

abstract：:Signal-to-noise ratio (SNR) is a critical factor in MR-guided high-intensity focused ultrasound (HIFU) for local heating, which can affect the accuracy of temperature measurement. In order to achieve high SNR and higher temporal resolution, dedicated coil arrays for MR-guided HIFU applications need to be developed. In...

journal_title：Magnetic resonance imaging

authors： Chen Q,Li Y,Jiang R,Zou C,Tie C,Wen J,Yang X,Zhang X,Liu X,Zheng H

更新日期：2020-01-01 00:00:00

abstract：:Superparamagnetic iron oxide particles (SPIOs) are usually referred to as T2 MR contrast agents, reducing signal intensity (SI) on T2-weighted MR images (negative enhancement). This study reports the original use of SPIOs as T1-enhancing contrast agents, primarily assessed in vitro, and then applied to an in vivo inve...

journal_title：Magnetic resonance imaging

authors： Canet E,Revel D,Forrat R,Baldy-Porcher C,de Lorgeril M,Sebbag L,Vallee JP,Didier D,Amiel M

更新日期：1993-01-01 00:00:00

abstract：:Contrast-enhanced 3D MR voiding urethrography (CE 3D MRVU) was performed on 5 healthy volunteers and 18 patients with urethral disease. After intravenous injection of 0.3 ml/kg gadolinium, the images of the three consecutive acquisitions of the 3D MRVU technique were obtained during voiding. The raw data were reconstr...

journal_title：Magnetic resonance imaging

authors： Yekeler E,Suleyman E,Tunaci A,Tunaci M,Balci NC,Onem K,Tunc M,Acunas G

更新日期：2004-11-01 00:00:00

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：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：:We determined whether the accuracy of magnetic resonance angiography (MRA) in the peripheral run-off vessels can be improved by using contrast-enhanced (CE) three-dimensional (3D) technique in comparison to electrocardiograph (ECG)-triggered two-dimensional (2D) time-of-flight (TOF) technique. In a prospective study 2...

journal_title：Magnetic resonance imaging

authors： Vosshenrich R,Kopka L,Castillo E,Böttcher U,Graessner J,Grabbe E

更新日期：1998-10-01 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：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：PURPOSE:To evaluate the reproducibility of quantitative diffusion measurements obtained with reduced Field of View (rFOV) and Multi-shot EPI (msEPI) acquisitions, using single-shot EPI (ssEPI) as a reference. METHODS:Diffusion phantom experiments, and prostate diffusion-weighted imaging in healthy volunteers and patie...

journal_title：Magnetic resonance imaging

authors： Zhang Y,Holmes J,Rabanillo I,Guidon A,Wells S,Hernando D

更新日期：2018-09-01 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：:Obstructive sleep apnea syndrome (OSAS) is caused by multi-level upper airway obstruction. Anatomic changes at the sites of obstruction may modify the physical or acoustic properties of snores. The surgical success of OSA depends upon precise localization of obstructed levels. We present a case of OSAS who received si...

journal_title：Magnetic resonance imaging

authors： Chen YJ,Shih TT,Chang YC,Hsu YC,Huon LK,Lo MT,Pham VT,Lin C,Wang PC

更新日期：2015-12-01 00:00:00

abstract：:Biliary cystadenomas and their malignant counterparts, biliary cystadenocarcinomas, are rare cystic tumors that arise from hepatobiliary epithelium. Ultrasound (US) and computed tomography (CT) are the initial imaging modalities used for the evaluation of biliary cystic tumors, but are not specific. MRI and MRCP, beca...

journal_title：Magnetic resonance imaging

authors： Williams DM,Vitellas KM,Sheafor D

更新日期：2001-11-01 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：:Articular cartilage thickness is of relevance in various fields in diagnostics and biomedical research. In view of recent improvements of MR cartilage imaging a computational method has been developed for three-dimensional determination of cartilage thickness from tomographic datasets. A correction algorithm that comp...

journal_title：Magnetic resonance imaging

authors： Lösch A,Eckstein F,Haubner M,Englmeier KH

更新日期：1997-01-01 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：:Functional magnetic resonance imaging (fMRI) was performed on a conventional 1.5 T scanner by means of a modified FLASH-technique at temporal resolutions of 80 and 320 ms. The method's stability was assessed by phantom measurements and by investigation of three volunteers resulting in a low amplitude (3%) periodic (4 ...

journal_title：Magnetic resonance imaging

authors： Wiener E,Schad LR,Baudendistel KT,Essig M,Müller E,Lorenz WJ

更新日期：1996-01-01 00:00:00

abstract：:New methods for acquiring and processing gradient NMR well log data enable signals from gas, light oil, and water to be unambiguously separated and, in many cases, quantified. These methods exploit the combined effects of T1-based and diffusion-based contrast on log response. T1 contrast, which separates the water and...

journal_title：Magnetic resonance imaging

authors： Mardon D,Prammer MG,Coates GR

更新日期：1996-01-01 00:00:00

abstract：:The localization of critical structures within the brain is important for the planning of therapeutic strategies. Functional MRI is capable to assess functional response of cortical structures to certain stimuli. The authors present two techniques for functional MRI (fMRI) in a stereotactic set-up. The skull of the pa...

journal_title：Magnetic resonance imaging

authors： Debus J,Essig M,Schad LR,Wenz F,Baudendistel K,Knopp MV,Engenhart R,Lorenz WJ

更新日期：1996-01-01 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：:The sensitivity of multiple diffusion MRI (dMRI) parameters to longitudinal changes in white matter microstructure was investigated for the 3xTg-AD transgenic mouse model of Alzheimer's disease, which manifests both amyloid beta plaques and neurofibrillary tangles. By employing a specific dMRI method known as diffusio...

journal_title：Magnetic resonance imaging

authors： Nie X,Falangola MF,Ward R,McKinnon ET,Helpern JA,Nietert PJ,Jensen JH

更新日期：2019-04-01 00:00:00