Intensity correction for multichannel hyperpolarized 13C imaging of the heart.

abstract：:The time evolution of water diffusion, perfusion, T1, and T2 is investigated at high magnetic field (8.5 T) following permanent middle cerebral artery occlusion in the rat. Cerebral blood flow maps were obtained using arterial spin tagging. Although the quantitative perfusion measurements in ischemic tissue still pose...

journal_title：Magnetic resonance in medicine

authors： Calamante F,Lythgoe MF,Pell GS,Thomas DL,King MD,Busza AL,Sotak CH,Williams SR,Ordidge RJ,Gadian DG

更新日期：1999-03-01 00:00:00

abstract：PURPOSE:The aims of this study were (i) to establish a robust and fast method to quantify hepatocellular phosphorus compounds in molar concentration on a 3T clinical scanner, (ii) to evaluate its reproducibility, and (iii) to test its feasibility for a use in large cohort studies. METHOD:Proton-decoupled (31) P magnet...

journal_title：Magnetic resonance in medicine

authors： Laufs A,Livingstone R,Nowotny B,Nowotny P,Wickrath F,Giani G,Bunke J,Roden M,Hwang JH

更新日期：2014-05-01 00:00:00

abstract：PURPOSE:To use quantitative susceptibility mapping (QSM) to investigate changes in cartilage canals in the distal femur of juvenile goats after their surgical transection. METHODS:Chondronecrosis was surgically induced in the right medial femoral condyles of four 4-day-old goats. Both the operated and control knees we...

journal_title：Magnetic resonance in medicine

authors： Wang L,Nissi MJ,Toth F,Johnson CP,Garwood M,Carlson CS,Ellermann J

更新日期：2017-03-01 00:00:00

abstract：PURPOSE:Dynamic phosphorus MR spectroscopic imaging (31 P-MRSI) experiments require temporal resolution on the order of seconds to concurrently assess different muscle groups. A highly accelerated pulse sequence combining flyback echo-planar spectroscopic imaging (EPSI) and compressed sensing was developed and tested i...

journal_title：Magnetic resonance in medicine

authors： Santos-Díaz A,Harasym D,Noseworthy MD

更新日期：2019-06-01 00:00:00

abstract：:T1 is often ill-determined. This means that an Ernst angle excitation often cannot be precisely defined for the simple pulse and acquire experiment. Here, published 31P T1 values of metabolites in human muscle, liver, heart, and brain are archived, some new data on heart and brain added, and overall confidence interva...

journal_title：Magnetic resonance in medicine

authors： Bottomley PA,Ouwerkerk R

更新日期：1994-07-01 00:00:00

abstract：:The vascular space occupancy (VASO) method was recently proposed as a functional MRI (fMRI) method that is capable of detecting activation-related changes in blood volume (CBV), without the need for a blood-pool contrast agent. In the present work we introduce a new whole-brain VASO technique that is based on a parall...

journal_title：Magnetic resonance in medicine

authors： Poser BA,Norris DG

更新日期：2009-07-01 00:00:00

abstract：:Intraplaque hemorrhage in atherosclerotic plaques has been associated with accelerated plaque growth as well as exacerbation of clinical symptoms. The identification of intraplaque hemorrhage using magnetic resonance imaging primarily relies on the detection of methemoglobin on T(1) weighted images. Current techniques...

journal_title：Magnetic resonance in medicine

authors： Wang J,Ferguson MS,Balu N,Yuan C,Hatsukami TS,Börnert P

更新日期：2010-11-01 00:00:00

abstract：:Dynamic susceptibility contrast (DSC) MRI is now increasingly used for measuring perfusion in many different applications. The quantification of DSC data requires the measurement of the arterial input function (AIF) and the deconvolution of the tissue concentration time curve. One of the most accepted deconvolution me...

journal_title：Magnetic resonance in medicine

authors： Calamante F,Gadian DG,Connelly A

更新日期：2000-09-01 00:00:00

abstract：:Image selected in vivo spectroscopy (ISIS) is a volume selection method often used for in vivo (31)P MRS, since it is suitable for measurements of substances with short T(2). However, ISIS can suffer from significant signal contributions caused by T(1) smearing from regions outside the VOI. A computer model was develo...

journal_title：Magnetic resonance in medicine

authors： Ljungberg M,Starck G,Vikhoff-Baaz B,Alpsten M,Ekholm S,Forssell-Aronsson E

更新日期：2000-10-01 00:00:00

abstract：PURPOSE:To develop a pulsed CEST magnetization-transfer method for rapidly acquiring relayed nuclear Overhauser enhancement (rNOE)-weighted images with magnetic transfer contrast (MTC) suppression at clinical field strength (3 T). METHODS:Using a pulsed CEST magnetization-transfer method with low saturation powers (B1...

journal_title：Magnetic resonance in medicine

authors： Huang J,Han X,Chen L,Xu X,Xu J,Chan KWY

更新日期：2021-01-01 00:00:00

abstract：:The long readout times of single-shot acquisitions and the high field strengths desired for functional MRI (fMRI) using blood oxygenation level-dependent (BOLD) contrast make functional scans sensitive to magnetic field inhomogeneity. If it is not corrected during image reconstruction, field inhomogeneity can cause ge...

journal_title：Magnetic resonance in medicine

authors： Sutton BP,Noll DC,Fessler JA

更新日期：2004-06-01 00:00:00

abstract：PURPOSE:To evaluate the feasibility of an improved motion and flow robust methodology for imaging the pulmonary vasculature using non-contrast-enhanced, free-breathing, golden-angle radial MRI. METHODS:Healthy volunteers (n = 10, age 46 ± 11 years, 50% female) and patients (n = 2, ages 27 and 84, both female) were ima...

journal_title：Magnetic resonance in medicine

authors： Fyrdahl A,Vargas Paris R,Nyrén S,Holst K,Ugander M,Lindholm P,Sigfridsson A

更新日期：2018-11-01 00:00:00

abstract：:Levo-tetrahydropalmatine (l-THP) has shown significant promise in preclinical and clinical studies to treat drug addiction. Pharmacological MRI methods can elucidate the regional cerebral effects of l-THP, but there are potential confounds from the use of general anesthesia. To investigate the possible anesthetic-drug...

journal_title：Magnetic resonance in medicine

authors： Liu X,Li R,Yang Z,Hudetz AG,Li SJ

更新日期：2012-08-01 00:00:00

abstract：:Recently, a technique based on arterial spin labeling, called dynamic arterial spin labeling (DASL (Magn Reson Med 1999;41:299-308)), has been introduced to measure simultaneously the transit time of the labeled blood from the labeling plane to the exchange site, the longitudinal relaxation time of the tissue, and the...

journal_title：Magnetic resonance in medicine

authors： Barbier EL,Silva AC,Kim SG,Koretsky AP

更新日期：2001-06-01 00:00:00

abstract：:Metabolite signals with short T(1) or T(2) are difficult to localize with full sensitivity. This limitation was overcome with the development and implementation of a single-shot, complete three-dimensional "non-echo" localization method with reduced sensitivity to spatial B(1) variation, which is suitable for measurin...

journal_title：Magnetic resonance in medicine

authors： Choi IY,Tkác I,Gruetter R

更新日期：2000-09-01 00:00:00

abstract：:Developing a method to noninvasively monitor tissue-engineered constructs is critical for the optimization of construct design and for assessing therapeutic efficacy. For this purpose, NMR is a powerful technique that can be used to obtain both images and spectroscopic data. But the inherent sensitivity of NMR limits ...

journal_title：Magnetic resonance in medicine

authors： Volland NA,Mareci TH,Constantinidis I,Simpson NE

更新日期：2010-04-01 00:00:00

abstract：:Fractional anisotropy (FA) and relative anisotropy (RA) are the two most commonly used scalar measures of anisotropy in diffusion tensor (DT) MRI. While a few published studies have shown that FA has superior noise immunity relative to RA, no theoretical basis has been proposed to explain this behavior. In the current...

journal_title：Magnetic resonance in medicine

authors： Hasan KM,Alexander AL,Narayana PA

更新日期：2004-02-01 00:00:00

abstract：:The commercial synthetic homopolypeptide polyaspartate (average MW = 30,000, approximately 220 monomers) in solution quantitatively binds up to 40 mol Gd3+ ions per mole of polyaspartate. The water proton relaxivity of the solutions is far higher than that of clinically used or commonly investigated gadolinium(III) co...

journal_title：Magnetic resonance in medicine

authors： Cavagna F,Luchinat C,Scozzafava A,Xia Z

更新日期：1994-01-01 00:00:00

abstract：:Brain water proton (1H2O) longitudinal relaxation time constants (T1) were obtained from three healthy individuals at magnetic field strengths (B0) of 0.2 Tesla (T), 1.0T, 1.5T, 4.0T, and 7.0T. A 5-mm midventricular axial slice was sampled using a modified Look-Locker technique with 1.5 mm in-plane resolution, and 32 ...

journal_title：Magnetic resonance in medicine

authors： Rooney WD,Johnson G,Li X,Cohen ER,Kim SG,Ugurbil K,Springer CS Jr

更新日期：2007-02-01 00:00:00

abstract：:A novel tagging method is introduced that increases the spatial resolution of estimates of myocardial radial thickening. The separation of adjacent parallel tag planes is customized to match the expected motion of specific regions of the heart wall. In regions in which the tags increase their separation over systole (...

journal_title：Magnetic resonance in medicine

authors： McVeigh ER,Bolster BD Jr

更新日期：1998-04-01 00:00:00

abstract：:Functional MRI studies to date have been generally performed using the blood oxygenation level dependent (BOLD) contrast mechanism. Recently, it has been proposed that dynamic change in the apparent diffusion coefficient (ADC), measured using intravoxel incoherent motion (IVIM) weighting, can be used as a robust funct...

journal_title：Magnetic resonance in medicine

authors： Harshbarger TB,Song AW

更新日期：2004-12-01 00:00:00

abstract：:A new ultrafast MR imaging method is proposed and tested, which enables whole-brain fMRI with a true temporal resolution of 1 sec. The method combines a 3D PRESTO pulse sequence with the concept of sensitivity-encoding with multiple receiver coils (SENSE). The so-called PRESTO-SENSE technique is demonstrated on a set ...

journal_title：Magnetic resonance in medicine

authors： Golay X,Pruessmann KP,Weiger M,Crelier GR,Folkers PJ,Kollias SS,Boesiger P

更新日期：2000-06-01 00:00:00

abstract：:Activity-induced manganese-dependent contrast (AIM) MRI is a hemodynamic-independent functional MRI method that used manganese ion as an MR-detectable contrast agent. In AIM, MnCl(2) is infused intra-arterially after the blood-brain barrier (BBB) is opened with a hyperosmolar agent. Upon functional stimulation of the ...

journal_title：Magnetic resonance in medicine

authors： Aoki I,Tanaka C,Takegami T,Ebisu T,Umeda M,Fukunaga M,Fukuda K,Silva AC,Koretsky AP,Naruse S

更新日期：2002-12-01 00:00:00

abstract：:The most widely-used functional magnetic resonance imaging (fMRI) technique is based on the blood oxygenation level dependent (BOLD) effect, which requires at least partial uncoupling between cerebral blood flow (CBF) and oxygen consumption changes during increased mental activity. To compare BOLD and CBF effects duri...

journal_title：Magnetic resonance in medicine

authors： Kim SG,Uğurbil K

更新日期：1997-07-01 00:00:00

abstract：:The use of the minimum stored energy current density map-based methodology of designing closed-bore symmetric superconducting magnets was described recently. The technique is further developed to cater for the design of interventional-type MRI systems, and in particular open symmetric magnets of the double-doughnut co...

journal_title：Magnetic resonance in medicine

authors： Tieng QM,Vegh V,Brereton IM

更新日期：2010-01-01 00:00:00

abstract：:IVIM MR imaging is a method which generates images of diffusion and perfusion in vivo. Until now, intravoxel incoherent motion (IVIM) images have been obtained using spin-echo sequences with extragradient pulses, resulting in long acquisition times (typically 2 x 8 min 32 s). A new method is proposed here, using stead...

journal_title：Magnetic resonance in medicine

authors： Le Bihan D

更新日期：1988-07-01 00:00:00

abstract：:Quantitative measurement of lung microstructure is of great significance in assessment of pulmonary disease, particularly in the earliest stages. The technique for MRI-based 3He lung morphometry was previously developed and validated for human lungs, and was recently extended to ex vivo mouse lungs. The technique yiel...

journal_title：Magnetic resonance in medicine

authors： Wang W,Nguyen NM,Yablonskiy DA,Sukstanskii AL,Osmanagic E,Atkinson JJ,Conradi MS,Woods JC

更新日期：2011-03-01 00:00:00

abstract：:A simple (2)H NMR method for quantifying absolute (2)H-enrichments in all seven aliphatic positions of glucose following its derivatization to monoacetone glucose is presented. The method is based on the addition of a small quantity of (2)H-enriched formate to the NMR sample. When the method was applied to [2-(2)H]mon...

journal_title：Magnetic resonance in medicine

authors： Jones JG,Perdigoto R,Rodrigues TB,Geraldes CF

更新日期：2002-09-01 00:00:00

abstract：:The protocol for delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) was adapted for the evaluation of transplanted osteochondral allograft cartilage. Eight patients with focal grade 4 cartilage defects of the femoral condyle were treated with single cylindrical osteochondral allografts. At 1 and 2 years, dGEMRIC i...

journal_title：Magnetic resonance in medicine

authors： Durkan MG,Szumowski J,Brown DS,Foss EW,Crawford DC

更新日期：2013-06-01 00:00:00

abstract：:31P NMR spectroscopy was used to study renal allografts in rats subjected to allograft rejection, cyclosporine toxicity, ischemia, and ureteral obstruction. Parameters of relative peak areas and intracellular pH were accurately distinguished among the different causes of graft dysfunction. Ureteral obstruction was cle...

journal_title：Magnetic resonance in medicine

authors： Shapiro JI,Haug CE,Weil R 3rd,Chan L

更新日期：1987-10-01 00:00:00