Analysis of microporosity and setting of reactive powder concrete by proton nuclear relaxation.

abstract：PURPOSE:The purpose of this study was to determine the pre- and postpubertal 1H magnetic resonance spectroscopic characteristics of the normal testis to establish baseline values for further clinical studies. MATERIALS AND METHODS:The subjects consisted of male volunteers, of whom 19 were prepubertal with ages between...

journal_title：Magnetic resonance imaging

authors： Firat AK,Uğraş M,Karakaş HM,Erdem G,Kurus M,Ugras M,Celik T,Kahraman B,Doğanay S

更新日期：2008-02-01 00:00:00

abstract：:The purpose of this study was to demonstrate the initial results of the dynamic contrast-enhanced MRA in under four seconds in the assessment of anomalous pulmonary circulation. We performed dynamic contrast enhanced MRA on ten patients with a temporal resolution of 2-3 sec for each phase. Five patients had pulmonary ...

journal_title：Magnetic resonance imaging

authors： Balci NC,Yalçin Y,Tunaci A,Balci Y

更新日期：2003-01-01 00:00:00

abstract：:Magnetic resonance spectroscopy (MRS) is ideally suited for physiology-neurochemistry experiments with the living brain and particularly for studies on the primary visual cortex (striate cortex or area V1). Yet, the highly convoluted form of the human V1 has thus far prevented the performance of MRS investigations tha...

journal_title：Magnetic resonance imaging

authors： Juchem C,Logothetis NK,Pfeuffer J

更新日期：2007-07-01 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：:Using both quantitative computer-assisted analysis and visual estimation the MR imaging response of brain metastases to whole-brain radiotherapy (WBRT) was prospectively studied in 49 patients. Compared to the computer-assisted analysis, the precision of the visual estimation (by two readers in conference) of tumor re...

journal_title：Magnetic resonance imaging

authors： Taphoorn MJ,Potman RA,Barkhof F,Weerts JG,Valk J,Karim AB,Heimans JJ

更新日期：1997-01-01 00:00:00

abstract：:In this paper the effects of reducing the flip angle of the 90-degree observation pulse in inversion recovery imaging are described and analyzed. When incorporated in an IR sequence with a short inversion time (STIR), reduction to the 90-degree pulse allows a significant shortening of the repetition time without loss ...

journal_title：Magnetic resonance imaging

authors： Bakker CJ,Witkamp TD,Janssen WM

更新日期：1991-01-01 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：:Hippocampal metabolite concentrations were determined by localized in vivo proton magnetic resonance spectroscopy (1H MRS) in eleven patients suffering from refractory mesial temporal lobe epilepsy (MTLE), as well as in eleven age-matched healthy volunteers, and compared with patient history, postoperative outcome and...

journal_title：Magnetic resonance imaging

authors： Duc CO,Trabesinger AH,Weber OM,Meier D,Walder M,Wieser HG,Boesiger P

更新日期：1998-10-01 00:00:00

abstract：:The optics of the ocular lens are determined by its geometry (shape and volume) and its inherent gradient of refractive index (water to protein ratio), which are in turn maintained by unique cellular physiology known as the lens internal microcirculation system. Previously, magnetic resonance imaging (MRI) has been us...

journal_title：Magnetic resonance imaging

authors： Muir ER,Pan X,Donaldson PJ,Vaghefi E,Jiang Z,Sellitto C,White TW

更新日期：2020-07-01 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：: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：PURPOSE:To analyze several histopathological features and their possible correlations with whole lesion histogram analysis derived from ADC maps in meningioma. MATERIALS AND METHODS:The retrospective study involved 36 patients with primary meningiomas. For every tumor, the following histogram analysis parameters of ap...

journal_title：Magnetic resonance imaging

authors： Surov A,Hamerla G,Meyer HJ,Winter K,Schob S,Fiedler E

更新日期：2018-09-01 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：: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：: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：:The advantages of the application of NMR imaging to the studies of enhanced oil recovery methods that include polymer slug flooding, combination slug flooding, and thermal soaking are described. ...

journal_title：Magnetic resonance imaging

authors： Weimin W,Dongjiang L,Wei L

更新日期：1996-01-01 00:00:00

abstract：:Radio frequency magnetic fields from 5 to 100 kHz off resonance reduce longitudinal magnetization of water in some tissues without affecting the magnetization of simple solutions (Wolff, S.D.; Balaban, R.S. Magnetization transfer contrast (MTC) and tissue water proton relaxation in vivo. Magn. Reson. Med. 10:135-144; ...

journal_title：Magnetic resonance imaging

authors： Dixon WT,Engels H,Castillo M,Sardashti M

更新日期：1990-01-01 00:00:00

abstract：INTRODUCTION:Pharmacokinetic parameters derived from dynamic contrast-enhanced MRI (DCE-MRI) data are sensitive to acquisition and post-processing techniques, which makes it difficult to compare results obtained using different methods. In particular, one of the most important factors affecting estimation of model para...

journal_title：Magnetic resonance imaging

authors： Wake N,Chandarana H,Rusinek H,Fujimoto K,Moy L,Sodickson DK,Kim SG

更新日期：2018-10-01 00:00:00

abstract：:There is increasing interest in imaging short T2 species which show little or no signal with conventional magnetic resonance (MR) pulse sequences. In this paper, we describe the use of three-dimensional ultrashort echo time (3D UTE) sequences with TEs down to 8 μs for imaging of these species. Image contrast was gener...

journal_title：Magnetic resonance imaging

authors： Du J,Bydder M,Takahashi AM,Carl M,Chung CB,Bydder GM

更新日期：2011-05-01 00:00:00

abstract：PURPOSE:To evaluate the utility of fat fraction (FF) for the differentiation of different breast tissues and in various breast tumor subtypes using in vivo proton (1H) magnetic resonance spectroscopy (MRS). METHODS:1H MRS was performed on 68 malignant, 35 benign, and 30 healthy volunteers at 1.5 T. Malignant breast ti...

journal_title：Magnetic resonance imaging

authors： Agarwal K,Sharma U,Mathur S,Seenu V,Parshad R,Jagannathan NR

更新日期：2018-06-01 00:00:00

abstract：:Conditions for generation of polarized RF fields in cylindrical symmetry by high order coils are presented. Whole body NMR transmitters utilizing this principle would require a current control on a certain number of loops. In the present design this is obtained by feeding each loop by an appropriate linear combination...

journal_title：Magnetic resonance imaging

authors： Sotgiu A,Gualtieri G,Passariello R

更新日期：1988-05-01 00:00:00

abstract：:A new phantom and evaluation method for experimental evaluation of 1H-magnetic resonance spectroscopy single volume localization techniques regarding signal contamination (C), defined as the part of the signal originating outside the volume of interest, is presented. The quality assessment method is based on a spheric...

journal_title：Magnetic resonance imaging

authors： Burtscher IM,Johansson E,Holtås S,Ståhlberg F

更新日期：1999-12-01 00:00:00

abstract：:To assess whether magnetic resonance imaging could assist in diagnosing Ewing sarcoma, we retrospectively analyzed T1- and T2-weighted images of 24 consecutive solitary lytic bone lesions, including 18 cases of histologically proven Ewing sarcoma, and six aggressive-appearing benign lesions including eosinophilic gran...

journal_title：Magnetic resonance imaging

authors： Hanna SL,Fletcher BD,Kaste SC,Fairclough DL,Parham DM

更新日期：1994-01-01 00:00:00

abstract：:Tumor aggressiveness and response to therapy are influenced by the extravascular extracellular space fraction (EESF) of the malignant tissue. The EESF may, therefore, be an important prognostic parameter for cancer patients. The aim of this study was to investigate whether gadopentetate dimeglumine (Gd-DTPA)-based dyn...

journal_title：Magnetic resonance imaging

authors： Benjaminsen IC,Brurberg KG,Ruud EB,Rofstad EK

更新日期：2008-02-01 00:00:00

abstract：PURPOSE:Intramuscular fat infiltration is a dynamic process, in response to exercise and muscle health, which can be quantified by estimating fat fraction (FF) from Dixon MRI. Healthy hip abductor muscles are a good indicator of a healthy hip and an active lifestyle as they have a fundamental role in walking. The autom...

journal_title：Magnetic resonance imaging

authors： Belzunce MA,Henckel J,Fotiadou A,Di Laura A,Hart A

更新日期：2020-10-01 00:00:00

abstract：:A new magnetic resonance imaging technique was applied to the Taylor-Couette and spiral Poiseuille (Taylor-Couette with superposed mean axial flux) flows for the first time. The experimental technique is a combination of spatial tagging methods and a snapshot FLASH imaging sequence, which allows the full-field visuali...

journal_title：Magnetic resonance imaging

authors： Moser KW,Raguin LG,Harris A,Morris HD,Georgiadis J,Shannon M,Philpott M

更新日期：2000-02-01 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：PURPOSE:To characterize the intracranial vascular features extracted from time of flight (TOF) images and their changes from baseline to follow-up in patients undergoing carotid revascularization, using arterial spin labeling (ASL) cerebral blood flow (CBF) measurement as a reference. METHODS:In this retrospective stu...

journal_title：Magnetic resonance imaging

authors： Chen Z,Chen L,Shirakawa M,Liu W,Ortega D,Chen J,Balu N,Trouard T,Hatsukami TS,Zhou W,Yuan C

更新日期：2021-01-01 00:00:00

abstract：:Blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) is currently the dominant technique for non-invasive investigation of brain functions. One of the challenges with BOLD fMRI, particularly at high fields, is compensation for the effects of spatiotemporally varying magnetic field inho...

journal_title：Magnetic resonance imaging

authors： Barry RL,Williams JM,Klassen LM,Gallivan JP,Culham JC,Menon RS

更新日期：2010-02-01 00:00:00

abstract：:The medical specialty radiology has experienced a number of extremely important and influential technical developments in the past that have affected how medical imaging is deployed. Artificial intelligence (AI) is potentially another such development that will introduce fundamental changes into the practice of radiol...

journal_title：Magnetic resonance imaging

authors： Gore JC

更新日期：2020-05-01 00:00:00