Ovarian Brenner tumors: MR imaging characteristics.

abstract：:The apparent diffusion coefficient (ADC) measured using magnetic resonance imaging methods provides information on microstructural properties of biological tissues, and thus has found applications as a useful biomarker for assessing changes such as those that occur in ischemic stroke and cancer. Conventional pulsed gr...

journal_title：Magnetic resonance imaging

authors： Xu J,Does MD,Gore JC

更新日期：2011-04-01 00:00:00

abstract：:In this study, in order to differentiate cavernous hemangioma and hepatic metastases, rapid acquisition relaxation enhanced (RARE) sequence was used. First, in vivo measurements of T1, T2 relaxation times and proton density were obtained using T1, T2 calculation protocol (TOMIKON S50, 0.5T) and multipoint techniques. ...

journal_title：Magnetic resonance imaging

authors： Jafari F,Nayeri N,Tahsini M,Khodadoust AA

更新日期：1999-06-01 00:00:00

abstract：PURPOSE:We present three-dimensional adiabatic inversion recovery prepared ultrashort echo time Cones (3D IR-UTE-Cones) imaging of cortical bone in the hip of healthy volunteers using a clinical 3T scanner. METHODS:A 3D IR-UTE-Cones sequence, based on a short pulse excitation followed by a 3D Cones trajectory, with a ...

journal_title：Magnetic resonance imaging

authors： Nazaran A,Carl M,Ma Y,Jerban S,Zhu Y,Lu X,Du J,Chang EY

更新日期：2017-12-01 00:00:00

abstract：:A magnetic resonance imaging cardiac magnetic susceptometry (MRI-CS) technique for assessing cardiac tissue iron concentration based on phase mapping was developed. Normal control subjects (n=9) and thalassemia patients (n=13) receiving long-term blood transfusion therapy underwent MRI-CS and MRI measurements of the c...

journal_title：Magnetic resonance imaging

authors： Wang ZJ,Fischer R,Chu Z,Mahoney DH Jr,Mueller BU,Muthupillai R,James EB,Krishnamurthy R,Chung T,Padua E,Vichinsky E,Harmatz P

更新日期：2010-04-01 00:00:00

abstract：:Etched particle tracks produced after heavy ion irradiation of polymer foils are used as model systems to test the performance of NMR in a newly developed ultrahigh magnetic field gradient system. The stimulated NMR echo decay of molecules diffusing in the channels, formulated in terms of the self part of the intermed...

journal_title：Magnetic resonance imaging

authors： Fujara F,Ilyina E,Nienstaedt H,Sillescu H,Spohr R,Trautmann C

更新日期：1994-01-01 00:00:00

abstract：:The performance evaluation of a semi-supervised fuzzy c-means (SFCM) clustering method for monitoring brain tumor volume changes during the course of routine clinical radiation-therapeutic and chemo-therapeutic regimens is presented. The tumor volume determined using the SFCM method was compared with the volume estima...

journal_title：Magnetic resonance imaging

authors： Vaidyanathan M,Clarke LP,Hall LO,Heidtman C,Velthuizen R,Gosche K,Phuphanich S,Wagner H,Greenberg H,Silbiger ML

更新日期：1997-01-01 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：:Spiral acquisition schemes offer unique advantages such as flow compensation, efficient k-space sampling and robustness against motion that make this option a viable choice among other non-Cartesian sampling schemes. For this reason, the main applications of spiral imaging lie in dynamic magnetic resonance imaging suc...

journal_title：Magnetic resonance imaging

authors： Delattre BM,Heidemann RM,Crowe LA,Vallée JP,Hyacinthe JN

更新日期：2010-07-01 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：:We have developed an in vivo longitudinally detected ESR (LODESR) imaging system operating at 700 MHz based on a loop-gap resonator and a pair of saddle-type pickup coils. A good linear relationship between the LODESR signal intensity and the applied power in a range up to 15.8 W was obtained. The detection of LODESR ...

journal_title：Magnetic resonance imaging

authors： Yokoyama H,Sato T,Tsuchihashi N,Ogata T,Ohya-Nishiguchi H,Kamada H

更新日期：1997-01-01 00:00:00

abstract：:Lipomatous tumors of the uterus are unusual, benign neoplasms seen in postmenopausal women. Although many of the mixed-type cases such as lipoleiomyoma and fibrolipoma have been reported, pure uterine lipomas are extremely rare. In the literature, a few cases with pure uterine lipoma have been reported. We first prese...

journal_title：Magnetic resonance imaging

authors： Erdem G,Celik O,Karakas HM,Alkan A,Hascalik S

更新日期：2007-10-01 00:00:00

abstract：:New applications of the NMR-MOUSE (mobile universal surface explorer) to non-destructive quality control of elastomers are reported. One example concern the thermal aging of fast clutches which was probed by measurements of 1H transverse relaxation time. Novel methodological developments show that 1H double-quantum fi...

journal_title：Magnetic resonance imaging

authors： Kühn H,Klein M,Wiesmath A,Demco DE,Blümich B,Kelm J,Gold PW

更新日期：2001-04-01 00:00:00

abstract：:Percentage of lipid content of 22 adrenal cortex lesions and their water proton longitudinal relaxation time were measured in vitro at 60 MHz. Although water relaxation times obtained on benign and malignant samples overlap each other, measurements of the percentage of lipids performed on the same tissues allow us to ...

journal_title：Magnetic resonance imaging

authors： Leroy-Willig A,Roucayrol JC,Luton JP,Courtieu J,Niesenbaum N,Louvel A

更新日期：1987-01-01 00:00:00

abstract：:A new approach is introduced for non-rigid registration of a pair of magnetic resonance images (MRI). It is a generalization of the demons algorithm with low computational cost, based on local information augmentation (by integrating multiple images) and balanced implementation. Specifically, a single deformation that...

journal_title：Magnetic resonance imaging

authors： Mesin L

更新日期：2020-12-01 00:00:00

abstract：INTRODUCTION:Glioma is the most common type of the primary CNS tumor. Radiotherapy is an important treatment measure after surgery. However, its highly invasive character is the main reason of postoperative recurrence. The aim of the study was to probe the correlation between the invasion ability and the metabolite cha...

journal_title：Magnetic resonance imaging

authors： Xu YJ,Cui Y,Li HX,Shi WQ,Li FY,Wang JZ,Zeng QS

更新日期：2016-10-01 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：:The ability to determine coil sensitivities implies that a method optimized in terms of maximized signal-to-noise ratio (SNR) can be applied to the combination of multiple coil images. An optimization of SNR subsequently results in a minimized variance in quantitative velocity measurements using phase-contrast imaging...

journal_title：Magnetic resonance imaging

authors： Thunberg P,Karlsson M,Wigström L

更新日期：2005-09-01 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：:We report on experiments to characterize internal magnetic field gradients that are caused by magnetic susceptibility differences between the solid phase and the fluids filling the pore space. Our measurements focus on low-field relaxometry of brine and oil in sandstones from various reservoirs around the world. Our r...

journal_title：Magnetic resonance imaging

authors： Appel M,Freeman JJ,Gardner JS,Hirasaki GH,Zhang QG,Shafer JL

更新日期：2001-04-01 00:00:00

abstract：:Parallel excitation using multiple transmit channels has emerged as an effective method to shorten multidimensional spatially selective radiofrequency (RF) pulses, which have a number of important applications, including B1 field inhomogeneity correction in high-field MRI. The specific absorption rate (SAR) is a prima...

journal_title：Magnetic resonance imaging

authors： Liu Y,Feng K,McDougall MP,Wright SM,Ji J

更新日期：2008-10-01 00:00:00

abstract：:Diffusion tensor magnetic resonance imaging (DTI) is useful for studying the microstructural changes in the spinal cord following traumatic injury; however, image quality is generally poor due to the small size of the spinal cord, physiological motion and susceptibility artifacts. Self-navigated, interleaved, variable...

journal_title：Magnetic resonance imaging

authors： Ellingson BM,Sulaiman O,Kurpad SN

更新日期：2010-11-01 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 most recently reported magnetic resonance first-pass myocardial perfusion studies were restricted to single slice imaging or a data analysis based on interactively placed regions of interest. This study was designed to investigate a new saturation recovery TurboFLASH sequence for multisection myocardial perfusion ...

journal_title：Magnetic resonance imaging

authors： Penzkofer H,Wintersperger BJ,Knez A,Weber J,Reiser M

更新日期：1999-02-01 00:00:00

abstract：PURPOSE:To provide a single open-source platform for comprehensive MR algorithm development inclusive of simulations, pulse sequence design and deployment, reconstruction, and image analysis. METHODS:We integrated the "Pulseq" platform for vendor-independent pulse programming with Graphical Programming Interface (GPI)...

journal_title：Magnetic resonance imaging

authors： Ravi KS,Potdar S,Poojar P,Reddy AK,Kroboth S,Nielsen JF,Zaitsev M,Venkatesan R,Geethanath S

更新日期：2018-10-01 00:00:00

abstract：AIM:The study aimed to validate magnetic resonance microscopy (MRM) studies of forensic tissue specimens (skin samples with electric injury patterns) against the results from routine histology. METHODS AND RESULTS:Computed tomography and magnetic resonance imaging are fast becoming important tools in clinical and fore...

journal_title：Magnetic resonance imaging

authors： Thali MJ,Dirnhofer R,Becker R,Oliver W,Potter K

更新日期：2004-10-01 00:00:00

abstract：:Peripheral magnetic resonance angiography (MRA) is growing in use. However, methods of performing peripheral MRA vary widely and continue to be optimized, especially for improvement in illustration of infrapopliteal arteries. The main purpose of this project was to identify imaging factors that can improve arterial vi...

journal_title：Magnetic resonance imaging

authors： Hood MN,Ho VB,Foo TK,Marcos HB,Hess SL,Choyke PL

更新日期：2002-09-01 00:00:00

abstract：:Biexponential T(2) relaxation of the localized water signal can be used for segmentation of spectroscopic volumes. To assess the specificity of the components an iterative relaxation measurement of the localized water signal (STEAM, 12 echo times, geometric spacing from 30 ms to 2000 ms) was combined with magnetizatio...

journal_title：Magnetic resonance imaging

authors： Helms G,Piringer A

更新日期：2001-07-01 00:00:00

abstract：:It is often desirable to separate voxels that contain signal from tissue along with measurement noise from those that contain purely measurement noise. Generally, this separation called thresholding utilizes only the magnitude portion of the images. Recently, methods have been developed that utilize both the magnitude...

journal_title：Magnetic resonance imaging

authors： Rowe DB,Haacke EM

更新日期：2009-11-01 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：:We report a geographic area of prominent hypointensity in T2-weighted images vs. normal adjacent liver parenchyma in a patient with cholangiocarcinoma and lymphangitic metastasis of the liver after superparamagnetic iron oxide (SPIO) administration. The area showing this prominent signal drop showed Kupffer cell proli...

journal_title：Magnetic resonance imaging

authors： Lee Y,Lee JS,Kim CM,Jeong JY,Choi JI,Kim MJ

更新日期：2008-05-01 00:00:00