A new method for diffusion weighted imaging.

abstract：AIM:To assess imaging findings and characteristics of the lymphatic system in patients affected by lipedema and lipolymphedema of the lower extremities on Non-Contrast MR Lymphography (NCMRL). MATERIALS AND METHODS:44 lower extremities in 11 consecutive female patients affected by lipedema, and 11 patients with lipoly...

journal_title：Magnetic resonance imaging

authors： Cellina M,Gibelli D,Soresina M,Menozzi A,Martinenghi C,Panzeri M,Oliva G

更新日期：2020-09-01 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：:We have extended the utility of NMR as a technique to probe porous media structure over length scales of approximately 100-2000 microm by using the spin 1/2 noble gas 129Xe imbibed into the system's pore space. Such length scales are much greater than can be probed with NMR diffusion studies of water-saturated porous ...

journal_title：Magnetic resonance imaging

authors： Mair RW,Hürlimann MD,Sen PN,Schwartz LM,Patz S,Walsworth RL

更新日期：2001-04-01 00:00:00

abstract：:Image quality and total scan time in MRI are determined in large part by the trajectory employed to sample the Fourier space. Each trajectory has different properties like coverage of k-space, scan time, sensitivity to off-resonance conditions, etc. These properties are often contradictory, therefore a universal optim...

journal_title：Magnetic resonance imaging

authors： Sabat S,Mir R,Guarini M,Guesalaga A,Irarrazaval P

更新日期：2003-09-01 00:00:00

abstract：:A parametric method is proposed to examine the relationship between neuronal activity, measured with event related potentials (ERPs), and the hemodynamic response, observed with functional magnetic resonance imaging (fMRI), during an auditory oddball paradigm. After verifying that the amplitude of the evoked response ...

journal_title：Magnetic resonance imaging

authors： Horovitz SG,Skudlarski P,Gore JC

更新日期：2002-05-01 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：PURPOSE:Visual review of individual spectra in magnetic resonance spectroscopic imaging (MRSI) data benefits from the application of spectral smoothing; however, if this processing step is applied prior to spectral analysis this can impact the accuracy of the quantitation. This study aims to analyze the effect of spect...

journal_title：Magnetic resonance imaging

authors： Goryawala M,Sullivan M,Maudsley AA

更新日期：2020-07-01 00:00:00

abstract：:Several recent articles have assessed the relative efficiency of nuclear magnetic resonance (NMR) pulse sequences. One consideration that has received little attention is the effect on image contrast of displaying images without information on the sign of the reconstructed signals. The radiofrequency receivers current...

journal_title：Magnetic resonance imaging

authors： Hendrick RE,Nelson TR,Hendee WR

更新日期：1984-01-01 00:00:00

abstract：:In certain nuclear magnetic resonance (NMR) applications in which accessibility to the gantry is limited, performing optimal tuning and matching represents a major problem. Here, we discuss a method of tuning NMR probe circuits and matching their impedances which uses cables with different impedance values. This simpl...

journal_title：Magnetic resonance imaging

authors： Villa P,Vaquero JJ,Chesnick S,Ruiz-Cabello J

更新日期：1999-09-01 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 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

abstract：:Phantoms for evaluation of nuclear magnetic resonance (NMR) imaging systems were made from water-based agarose gels, according to a standard procedure herein described. Copper sulfate (CuSO4) was included in the gels to further affect their proton relaxation characteristics. The proton relaxation rates of each batch o...

journal_title：Magnetic resonance imaging

authors： Mitchell MD,Kundel HL,Axel L,Joseph PM

更新日期：1986-01-01 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：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：:Traumatic brain injury (TBI) is one of the commonest causes of morbidity and mortality in the developed countries with posttraumatic epilepsy and functional disability being its major sequelae. The purpose of this study was to test the hypothesis whether the normal appearing adjacent gray and white matter regions on T...

journal_title：Magnetic resonance imaging

authors： Kumar R,Gupta RK,Rao SB,Chawla S,Husain M,Rathore RK

更新日期：2003-10-01 00:00:00

abstract：:In this work an interleaved multiple-gradient-echo chemical shift imaging (IMGE-CSI) technique was designed, implemented and evaluated at 1.5 and 4T for high-resolution lipid quantification and R(2)* measurement in-vivo. The method is analogous to echo planar CSI but utilizes conventional gradient echoes, exploiting t...

journal_title：Magnetic resonance imaging

authors： Hilaire L,Wehrli FW,Song HK

更新日期：2000-09-01 00:00:00

abstract：:This work discusses the effect of sampling time on noise, signal-to-noise and contrast-to-noise ratios in magnetic resonance imaging. A simple imaging experiment is performed to demonstrate the effect of sampling time on noise, confirming theoretical expectations that doubling the sampling time while decreasing the re...

journal_title：Magnetic resonance imaging

authors： Hendrick RE

更新日期：1987-01-01 00:00:00

abstract：UNLABELLED:The conventional diagnostic work-up of a patient suspected of having a vascular cause for stridor, or dysphagia, includes esophagography and bronchoscopy to delineate the abnormal structure without imaging the structure itself. Cine-angiography is regarded as the golden standard, but is not routinely perform...

journal_title：Magnetic resonance imaging

authors： Beekman RP,Hazekamp MG,Sobotka MA,Meijboom EJ,de Roos A,Staalman CR,Beek FJ,Ottenkamp J

更新日期：1998-01-01 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：:Truncation artifacts arise in magnetic resonance spectroscopic imaging (MRSI) of the human brain due to limited coverage of k-space necessitated by low SNR of metabolite signal and limited scanning time. In proton MRSI of the head, intense extra-cranial lipid signals "bleed" into brain regions, thereby contaminating s...

journal_title：Magnetic resonance imaging

authors： Sarkar S,Heberlein K,Hu X

更新日期：2002-12-01 00:00:00

abstract：:An understanding of the nucleation and growth mechanism of methane hydrate in porous space is essential for exploitation and application of hydrates, but the mechanism is yet to be clarified. Magnetic resonance imaging (MRI) was employed to visually analyze the spatial and temporal formation behavior of methane hydrat...

journal_title：Magnetic resonance imaging

authors： Zhang L,Sun L,Sun M,Lv X,Dong H,Miao Y,Yang L,Song Y,Zhao J

更新日期：2019-09-01 00:00:00

abstract：PURPOSE:To develop a technique for three dimensional (3D) high resolution joint imaging of intracranial and extracranial arterial walls with improved cerebrospinal fluid (CSF) suppression and good blood suppression based on T1 weighted sampling perfection with application optimized contrast using different angle evolut...

journal_title：Magnetic resonance imaging

authors： Zhang L,Zhang N,Wu J,Liu X,Chung YC

更新日期：2017-12-01 00:00:00

abstract：:Until recently, NMR imaging with intermolecular multiple-quantum coherences (iMQCs) has been based on the acquisition of a single echo. In vivo studies of iMQC image contrast would greatly benefit from a method that could acquire several orders of quantum coherence during the same acquisition. This would enable compar...

journal_title：Magnetic resonance imaging

authors： Shannon KL,Branca RT,Galiana G,Cenzano S,Bouchard LS,Soboyejo W,Warren WS

更新日期：2004-12-01 00:00:00

abstract：:A new approach to solid-state imaging (SSI) is presented. The method relies on narrowing the resonance line using the Lee-Goldburg sequence. The technique is easy to implement in practice and may find widespread applications in materials science. ...

journal_title：Magnetic resonance imaging

authors： De Luca F,Lugeri N,De Simone BC,Maraviglia B

更新日期：1992-01-01 00:00:00

abstract：:The clinical evaluation of three-dimensional time-of-flight MR angiography was prospectively performed in 16 patients with intracranial meningioma. MR angiographic techniques used in this study both with and without gadopentetate dimeglumine made it possible to demonstrate the topographic relationship between the tumo...

journal_title：Magnetic resonance imaging

authors： Kadota T,Kuriyama K,Inoue E,Fujita M,Nakagawa H,Kuroda C

更新日期：1993-01-01 00:00:00

abstract：:Pellets of HeLa from suspension cultured cells in isotonic medium (300 mosmolar) were introduced into a Bruker CXP100 NMR spectrophotometer at 80 mHz within 5 min of the start of centrifugation. T1 and T2 times were measured within a total elapsed time of 20-25 min at 80 mHz and 37 degrees C, and averaged 1430 msec an...

journal_title：Magnetic resonance imaging

authors： Wheatley DN,Rimmington JE,Foster MA

更新日期：1990-01-01 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：:Dynamic contrast-enhanced magnetic resonance imaging (MRI) is widely used for measuring perfusion and blood volume, especially cerebral blood volume (CBV). In case of blood-brain barrier (BBB) disruption, the conventional techniques only partially determine the pharmacokinetic parameters of contrast medium (CM) exchan...

journal_title：Magnetic resonance imaging

authors： Lüdemann L,Hamm B,Zimmer C

更新日期：2000-12-01 00:00:00

abstract：:Liver fibrosis determines the functional liver reserve. Several studies have reported that the apparent diffusion coefficient (ADC) values of diffusion-weighted magnetic resonance imaging (DW-MRI) can assess liver fibrosis. We investigated whether DW-MRI predicts postoperative hepatic insufficiency and liver fibrosis ...

journal_title：Magnetic resonance imaging

authors： Kim SU,Kim YC,Choi JS,Kim KS,Choi GH,Choi JS,Park JY,Kim DY,Ahn SH,Choi EH,Park YN,Chon CY,Han KH,Kim MJ

更新日期：2010-07-01 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