Assessment of cardiac iron by MRI susceptometry and R2* in patients with thalassemia.

abstract：:The advantages of event-related functional Magnetic Resonance Imaging (fMRI) and the increasing use of fMRI in cognitive experiments are both driving the development of techniques that allow images sensitive to the blood oxygen level-dependent effect to be acquired at ever-higher temporal resolution. Here, we present ...

journal_title：Magnetic resonance imaging

authors： Gibson A,Peters AM,Bowtell R

更新日期：2006-05-01 00:00:00

abstract：:High field MRI has been applied to high-resolution structural and functional imaging of the brain. Echo planar imaging (EPI) is an ultrafast acquisition technique widely used in diffusion imaging, functional MRI and perfusion imaging. However, it suffers from geometric and intensity distortions caused by static magnet...

journal_title：Magnetic resonance imaging

authors： Hong X,To XV,Teh I,Soh JR,Chuang KH

更新日期：2015-11-01 00:00:00

abstract：:Although there is ample evidence in the literature for structural, functional and physiological asymmetries in the two hemispheres of human brain, direct evidence of a similar asymmetry in the in vivo distribution of brain metabolites has been lacking. In this study, the existence of chemical asymmetries in six differ...

journal_title：Magnetic resonance imaging

authors： Jayasundar R,Raghunathan P

更新日期：1997-01-01 00:00:00

abstract：:The nonhuman primate brain study provides important supplemental means for human brain exploration since the two species share close anatomical and functional similarities. MR diffusion tensor imaging (DTI) in human brain has revealed exquisite details of brain structures especially in the brain white matter. However,...

journal_title：Magnetic resonance imaging

authors： Liu X,Zhu T,Gu T,Zhong J

更新日期：2009-04-01 00:00:00

abstract：:Pathologically, hippocampal sclerosis (HS) is characterized by neuronal loss and gliosis affecting particularly the pyramidal neurons of CA1, CA3, and CA4 with relative sparing of the CA2 neurons. This can be identified in vivo with magnetic resonance (MR) imaging techniques that can reveal both morphological and sign...

journal_title：Magnetic resonance imaging

authors： Jackson GD

更新日期：1995-01-01 00:00:00

abstract：:Noise estimation is a challenging task in magnetic resonance imaging (MRI), with applications in quality assessment, filtering or diffusion tensor estimation. Main noise estimators based on the Rician model are revisited and classified in this article, and new useful methods are proposed. Additionally, all the surveye...

journal_title：Magnetic resonance imaging

authors： Aja-Fernández S,Tristán-Vega A,Alberola-López C

更新日期：2009-12-01 00:00:00

abstract：:Respiratory motion and capnometry monitoring were performed during blood oxygen level-dependent (BOLD) functional magnetic resonance imaging (fMRI) of the brain while a series of paced hyperventilation tasks were performed that caused significant hypocapnia. Respiration volume per time (RVT) and end-tidal carbon dioxi...

journal_title：Magnetic resonance imaging

authors： Vogt KM,Ibinson JW,Schmalbrock P,Small RH

更新日期：2011-11-01 00:00:00

abstract：PURPOSE:To develop a method for estimating metabolite concentrations using phased-array coils and sensitivity-encoded (SENSE) magnetic resonance spectroscopic images (MRSI) of the human brain. MATERIALS AND METHODS:The method is based on the phantom replacement technique and uses receive coil sensitivity maps and body...

journal_title：Magnetic resonance imaging

authors： Bonekamp D,Smith MA,Zhu H,Barker PB

更新日期：2010-04-01 00:00:00

abstract：:It is a big challenge to segment magnetic resonance (MR) images with intensity inhomogeneity. The widely used segmentation algorithms are region based, which mostly rely on the intensity homogeneity, and could bring inaccurate results. In this paper, we propose a novel region-based active contour model in a variationa...

journal_title：Magnetic resonance imaging

authors： Liu L,Zhang Q,Wu M,Li W,Shang F

更新日期：2013-05-01 00:00:00

abstract：:Multi-echo pulse sequences for producing T2-weighted images in much reduced imaging times have recently been developed for routine clinical use. A number of recent articles have described the contrast obtained with fast spin-echo (FSE) sequences and have generally indicated that they depict tissues very similarly to c...

journal_title：Magnetic resonance imaging

authors： Constable RT,Anderson AW,Zhong J,Gore JC

更新日期：1992-01-01 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：: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：PURPOSE:To investigate right ventricular (RV) strain in patients without identified cardiac pathology using cardiac magnetic resonance tissue tracking (CMR TT). METHODS:A total of 50 consecutive patients with no identified cardiac pathology were analyzed. RV longitudinal and circumferential strain was assessed by CMR ...

journal_title：Magnetic resonance imaging

authors： Truong VT,Safdar KS,Kalra DK,Gao X,Ambach S,Taylor MD,Moore R,Taylor RJ,Germann J,Toro-Salazar O,Jefferies JL,Bartone C,Raman SV,Ngo T,Mazur W

更新日期：2017-05-01 00:00:00

abstract：:Tissue contrast obtained using fast spin-echo (FSE) and conventional spin-echo (SE) sequences is not identical and a number of mechanisms are thought to contribute to these contrast differences. The effect of stimulated echoes has previously been apparently ruled out as a contributing mechanism. Signal-to-noise ratios...

journal_title：Magnetic resonance imaging

authors： Williams CF,Redpath TW,Smith FW

更新日期：1996-01-01 00:00:00

abstract：PURPOSE:A direct correlation between T(1ρ), T(2) and quantified proteoglycan and collagen contents in human osteoarthritic cartilage has yet to be documented. We aimed to investigate the orientation effect on T(1ρ) and T(2) values in human osteoarthritic cartilage and to quantify the correlation between T(1ρ), T(2) vs....

journal_title：Magnetic resonance imaging

authors： Li X,Cheng J,Lin K,Saadat E,Bolbos RI,Jobke B,Ries MD,Horvai A,Link TM,Majumdar S

更新日期：2011-04-01 00:00:00

abstract：PURPOSE:To evaluate whether semi-quantitative analysis of high temporal resolution dynamic contrast-enhanced MRI (DCE-MRI) acquired early in treatment can predict the response of locally advanced breast cancer (LABC) to neoadjuvant chemotherapy (NAC). MATERIALS AND METHODS:As part of an IRB-approved prospective study,...

journal_title：Magnetic resonance imaging

authors： Abramson RG,Li X,Hoyt TL,Su PF,Arlinghaus LR,Wilson KJ,Abramson VG,Chakravarthy AB,Yankeelov TE

更新日期：2013-11-01 00:00:00

abstract：:The metabolism of 5-fluorouracil (5-FU) is complex and the reason for the low response rate of tumor patients to 5-FU is currently unknown. The aim of this study was to evaluate whether spectral parameters obtained noninvasively by in vivo 19F nuclear magnetic resonance (NMR) spectroscopy can be used to assess individ...

journal_title：Magnetic resonance imaging

authors： Schlemmer HP,Bachert P,Semmler W,Hohenberger P,Schlag P,Lorenz WJ,van Kaick G

更新日期：1994-01-01 00:00:00

abstract：BACKGROUND:The diagnosis and management of mild traumatic brain injury (MTBI) continue to be subjects of debate, with varying opinions regarding the extent to which tissue-based impairments versus the impacts of other stressors cause ongoing disability. Detecting areas of the brain with abnormalities that can explain s...

journal_title：Magnetic resonance imaging

authors： Kasahara K,Hashimoto K,Abo M,Senoo A

更新日期：2012-05-01 00:00:00

abstract：:We compared the ability and reproducibility of a fast fluid-attenuated inversion recovery (fast-FLAIR) sequence with and without a magnetization transfer (MT) pulse for detecting and measuring multiple sclerosis (MS)-related abnormalities on magnetic resonance imaging (MRI) scans from 20 patients. The Contrast-to-Nois...

journal_title：Magnetic resonance imaging

authors： Filippi M,Rocca MA,Mastronardo G,Comi G

更新日期：1999-04-01 00:00:00

abstract：:Ultra-high field magnetic resonance imaging data obtained using a multi-echo gradient echo sequence has been shown to contain information on tissue microstructure. Quantitative assessment of water fraction, relaxation time and frequency shift using multi-compartment signal modelling may help improve our understanding ...

journal_title：Magnetic resonance imaging

authors： Thapaliya K,Urriola J,Barth M,Reutens DC,Bollmann S,Vegh V

更新日期：2019-09-01 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：:Because of their paramagnetic properties, nitroxides are potentially useful as contrast agents in magnetic resonance imaging (MRI). They are reduced in vivo to their corresponding hydroxylamines which are nonparamagnetic and have no contrast enhancing property. Nitroxides with high resistance to reduction would be adv...

journal_title：Magnetic resonance imaging

authors： Couet WR,Brasch RC,Sosnovsky G,Tozer TN

更新日期：1985-01-01 00:00:00

abstract：:High density barium sulphate suspension was investigated as an oral contrast on MRI. On 30 consecutive subjects, the stomach (in all cases) and the two first portions of the duodenum (in 21 cases) were filled with the suspension. This oral contrast behaved as a negative contrast, being hypointense on all pulse sequenc...

journal_title：Magnetic resonance imaging

authors： Marti-Bonmati L,Vilar J,Paniagua JC,Talens A

更新日期：1991-01-01 00:00:00

abstract：OBJECTIVES:To compare the accuracy of contrast-enhanced ultrasound (CEUS) and Dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) for the assessment of changes in tissue vascularization as result of sorafenib treatment in a rat model of hepatocellular carcinoma (HCC). METHODS:Male Buffalo rats with orthot...

journal_title：Magnetic resonance imaging

authors： Muñoz NM,Minhaj AA,Maldonado KL,Kingsley CV,Cortes AC,Taghavi H,Polak U,Mitchell JM,Ensor JE,Bankson JA,Rashid A,Avritscher R

更新日期：2019-04-01 00:00:00

abstract：:The objective of this study was to measure T2* values of the normal human lung in vivo during breathhold using a rapid gradient-echo sequence with ultra-short echo times (TE). A sagittal slice of the right lung was imaged in six volunteers with various TE ranging from 0.5 ms to 5 ms using a clinical 1.5 Tesla MR scann...

journal_title：Magnetic resonance imaging

authors： Stock KW,Chen Q,Hatabu H,Edelman RR

更新日期：1999-09-01 00:00:00

abstract：OBJECTIVE:The pathological changes in Parkinson disease begin in the brainstem; reach the limbic system and ultimately spread to the cerebral cortex. In Parkinson disease (PD) patients, we evaluated the alteration of cingulate fibers, which comprise part of the limbic system, by using diffusional kurtosis imaging (DKI)...

journal_title：Magnetic resonance imaging

authors： Kamagata K,Tomiyama H,Motoi Y,Kano M,Abe O,Ito K,Shimoji K,Suzuki M,Hori M,Nakanishi A,Kuwatsuru R,Sasai K,Aoki S,Hattori N

更新日期：2013-11-01 00:00:00

abstract：:Budd-Chiari syndrome (BCS) is a rare disorder caused by the obstruction of hepatic venous outflow, leading to sinusoidal congestion, ischemic injury to liver cells and portal hypertension. Long-term survival largely depends on whether hepatocellular carcinoma occurs. A recently available liver-specific contrast medium...

journal_title：Magnetic resonance imaging

authors： Kitajima K,Yoshikawa T,Seo Y,Ohno Y,Yano Y,Miki A,Kanda T,Kanata N,Azuma T,Sugimura K

更新日期：2011-05-01 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：:Many informatics tools have emerged to process the voluminous and complex data generated by functional magnetic resonance imaging (fMRI). The interpretation of fMRI exams is largely determined by these tools. However, their performance is hard to evaluate because there is no independent means of calibration. A novel f...

journal_title：Magnetic resonance imaging

authors： Cheng H,Zhao Q,Duensing GR,Edelstein WA,Spencer D,Browne N,Saylor C,Limkeman M

更新日期：2006-04-01 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