Assessment of the anomalous pulmonary circulation by dynamic contrast-enhanced MR angiography in under four seconds.

abstract：:We have synthesized a surface functionalized superparamagnetic iron oxide colloid whose clearance from the vascular compartment was inhibited by asialofetuin but not fetuin. Unlike other particulate or colloidal magnetic resonance (MR) contrast agents, the agent of the current communication is not withdrawn from the v...

journal_title：Magnetic resonance imaging

authors： Josephson L,Groman EV,Menz E,Lewis JM,Bengele H

更新日期：1990-01-01 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：:This paper describes a geometrically small NMR imaging system which has been developed and assembled within a university medical center environment. Consideration is given to the technical specifications and basic economics for the magnet system, NMR spectrometer, and computer configuration. Initial research objective...

journal_title：Magnetic resonance imaging

authors： Thomas SR,Ackerman JL,Goebel JR,Davis M,Kereiakes JG,Lin YY

更新日期：1982-01-01 00:00:00

abstract：:The effects of varying the inversion or excitation RF pulse flip angles on image contrast and imaging time have been investigated in IR imaging theoretically, with phantoms and with normal volunteers. Signal intensity in an IR pulse sequence as a function of excitation, inversion and refocusing pulse flip angles was c...

journal_title：Magnetic resonance imaging

authors： Vinitski S,Albert S,Mitchell DG,Tasciyan TA,Rifkin MD

更新日期：1992-01-01 00:00:00

abstract：:A new pulse sequence for estimating cerebral blood flow called UNFAIR, which uses a combination of sequential hyperbolic secant preparatory pulses, is introduced. This sequence is based on the same generalized conditions as previously introduced inversion recovery techniques except that the spins in the image slice of...

journal_title：Magnetic resonance imaging

authors： Helpern JA,Branch CA,Yongbi MN,Huang NC

更新日期：1997-01-01 00:00:00

abstract：:In the breast carcinamas, sentinel lymph node biopsy (SLNB) attracts attention as technique to be settled by axillary lymph node metastasis, but existence of a false negative case is a problem. Equivalent cross relaxation rate image (ECRI) is the measurement method that we can evaluate a change of organization structu...

journal_title：Magnetic resonance imaging

authors： Matsushima S,Sasaki F,Sarumaru S,Ohta D,Era S,Sogami M,Inaba T,Kinosada Y

更新日期：2003-11-01 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：:Peripancreatic fluid collections are among the common post pancreas transplant complications, which are mainly due to leakage from the anastomosis site to bowel and graft pancreatitis. Differentiation between these two entities is important because they are treated differently. In this case, secretin stimulated magnet...

journal_title：Magnetic resonance imaging

authors： Alkaade S,Fattahi R,Balci NC,Akduman EI,Garvin PJ,Modanlou KA,Burton FR

更新日期：2009-09-01 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：AIM:Matrix metalloproteases (MMPs) expression and their inhibitors (TIMPs) play an important role in tumor physiopathology, so we investigated the relationship between the magnetic resonance (MR) and MMPs/TIMPs expression by breast carcinomas. MATERIALS AND METHODS:MRI parameters of 64 breast carcinomas were investiga...

journal_title：Magnetic resonance imaging

authors： Cuadriello EF,Fernández-Guinea Ó,Eiró N,González LO,Junquera S,Vizoso FJ

更新日期：2016-10-01 00:00:00

abstract：:The HASTE (half-Fourier acquisition single-shot turbo spin-echo) technique delivers images with T2-weighting in about half a second and could be ideal for fast dynamic studies when T2-weighting is needed. We evaluated cardiac-triggered HASTE to study cervical spine flexion/extension. The cervical spines of ten asympto...

journal_title：Magnetic resonance imaging

authors： Duerinckx AJ,Yu WD,El-Saden S,Kim D,Wang JC,Sandhu HS

更新日期：1999-04-01 00:00:00

abstract：PURPOSE:Rapid regional fluctuations in GABA may result in inhomogeneous concentrations throughout the brain parenchyma. The goal of this study is to provide further insight into the natural distribution of GABA throughout the brain and thus determine if a surrogate site may be used for spectroscopy when evaluating moto...

journal_title：Magnetic resonance imaging

authors： Durst CR,Michael N,Tustison NJ,Patrie JT,Raghavan P,Wintermark M,Sendhil Velan S

更新日期：2015-06-01 00:00:00

abstract：:Combining electrical stimulation with fMRI (esfMRI) has proven to be an important tool to study the global effects of electrical stimulation on neural networks in the brain. Here we extend our previous studies to stimulating the upper superior temporal sulcus (STS) in the anesthetized monkey. Our results show that sti...

journal_title：Magnetic resonance imaging

authors： Sultan F,Augath M,Murayama Y,Tolias AS,Logothetis N

更新日期：2011-12-01 00:00:00

abstract：:The purpose of this study was to develop a method to determine time discrepancies between input and myocardial time-signal intensity (TSI) curves for accurate estimation of myocardial perfusion with first-pass contrast-enhanced MRI. Estimation of myocardial perfusion with contrast-enhanced MRI using kinetic models req...

journal_title：Magnetic resonance imaging

authors： Natsume T,Ishida M,Kitagawa K,Nagata M,Sakuma H,Ichihara T

更新日期：2015-11-01 00:00:00

abstract：:We propose a new method to determine wettability indices from NMR relaxometry. The new method uses the sensitivity of low field NMR relaxometry to the fluid distribution in oil-water saturated porous media. The model is based on the existence of a surface relaxivity for both oil and water, allowing the determination o...

journal_title：Magnetic resonance imaging

authors： Fleury M,Deflandre F

更新日期：2003-04-01 00:00:00

abstract：:It has previously been observed that during isometric dorsiflexion exercise, the time course of T2-weighted signal intensity (SI) changes is spatially heterogeneous. The purpose of this study was to test the hypothesis that this spatial heterogeneity would increase at higher contraction intensities. Eight subjects per...

journal_title：Magnetic resonance imaging

authors： Damon BM,Wadington MC,Lansdown DA,Hornberger JL

更新日期：2008-10-01 00:00:00

abstract：:For a number of reasons, it is desirable to fabricate coils which, for a known current, shall produce predetermined values of the magnetic field intensity at a number of points within a nuclear magnetic resonance imager. The calculation of the magnetic field intensity at a set of points involves the integration of the...

journal_title：Magnetic resonance imaging

authors： Letcher JH

更新日期：1989-11-01 00:00:00

abstract：:Our purpose was to investigate three-dimensional (3D) gadolinium-enhanced magnetic resonance angiography (Gd-MRA) in the evaluation of renal transplant arteries. Eleven MR angiography examinations were performed in nine renal transplant patients. Gd-MRA, three-dimensional phase contrast (3D-PC) post-gadolinium, and tw...

journal_title：Magnetic resonance imaging

authors： Johnson DB,Lerner CA,Prince MR,Kazanjian SN,Narasimham DL,Leichtman AB,Cho KJ

更新日期：1997-01-01 00:00:00

abstract：:In this work, magnetic resonance imaging (MRI) was employed to observe the in-situ formation and dissociation of methane hydrates in porous media. Methane hydrate was formed in a high-pressure cell with controlled temperature, and then the hydrate was dissociated by thermal injection. The process was photographed by t...

journal_title：Magnetic resonance imaging

authors： Zhao J,Lv Q,Li Y,Yang M,Liu W,Yao L,Wang S,Zhang Y,Song Y

更新日期：2015-05-01 00:00:00

abstract：:Fricke-agarose gels have been irradiated with a proton beam. Then samples have been extracted at different depths with respect to the beam penetration distance, corresponding to different irradiation doses. Relaxation times T1 and T2, measured at 17 MHz, appear sensitive to this kind of radiation. In particular, T2 ex...

journal_title：Magnetic resonance imaging

authors： Di Capua S,D'Errico F,Egger E,Guidoni L,Luciani AM,Rosi A,Viti V

更新日期：1997-01-01 00:00:00

abstract：:Measurements have been carried out in six subjects at magnetic fields of 1.5, 3 and 7 T, with the aim of characterizing the variation of T2* with field strength in human brain. Accurate measurement of T2* in the presence of macroscopic magnetic field inhomogeneity is problematic due to signal decay resulting from thro...

journal_title：Magnetic resonance imaging

authors： Peters AM,Brookes MJ,Hoogenraad FG,Gowland PA,Francis ST,Morris PG,Bowtell R

更新日期：2007-07-01 00:00:00

abstract：:Type A acute aortic dissection (TAAAD) sometimes presents with acute stroke-like symptoms. When intravenous tissue plasminogen activator (IV-tPA) therapy is considered for acute ischemic stroke, TAAAD must be excluded. Painless TAAAD presenting with acute stroke may be easily missed. Two cases of painless TAAAD presen...

journal_title：Magnetic resonance imaging

authors： Matsumoto H,Yoshida Y,Hirata Y

更新日期：2016-09-01 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：:Diffraction ideas were first introduced to NMR by Mansfield and Grannell. Here we compare "Mansfield (k-space) diffraction" with the "diffusive (q-space) diffraction," noting their similarities and differences. The diffusive-diffraction concept is extremely helpful in elucidating the Pulsed Gradient Spin Echo NMR expe...

journal_title：Magnetic resonance imaging

authors： Callaghan PT

更新日期：1996-01-01 00:00:00

abstract：:Thoracic and abdominal magnetic resonance imaging studies generally require some type of compensation for respiratory and cardiac motions in order to yield artifact-free images with good signal-to-noise ratio. Most techniques for respiratory compensation require the use of a non-NMR sensing device to monitor the subje...

journal_title：Magnetic resonance imaging

authors： Fishbein KW,McConville P,Spencer RG

更新日期：2001-07-01 00:00:00

abstract：:We used magnetic resonance imaging (MRI) and water-suppressed proton MR spectroscopic imaging (1H MRSI) to study the effects of human immunodeficiency virus (HIV) infection on the brain. Our recent in vivo finding of lower N-acetylaspartate (NAA), a putative marker of neurons, in the supraventricular brain of cognitiv...

journal_title：Magnetic resonance imaging

authors： Meyerhoff DJ,MacKay S,Poole N,Dillon WP,Weiner MW,Fein G

更新日期：1994-01-01 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：:Measurements of time-dependent diffusion are performed on a rock sample saturated first with water, then methane and finally ethane. The gases were selected because their increased diffusivities and relaxation times allow probing greater length scales than water and because of their practical relevance. The nuclear ma...

journal_title：Magnetic resonance imaging

authors： Flaum M,Hirasaki GJ,Flaum C,Straley C

更新日期：2005-02-01 00:00:00

abstract：:A magnetic resonance imaging (MRI) method is described that allows interleaved measurements of transverse (R(2)(*) and R(2)) and longitudinal (R(1)) relaxation rates of tissue water in conjunction with spin labeling. The image-contrasts are intrinsically blood oxygenation level dependent (BOLD) and cerebral blood flow...

journal_title：Magnetic resonance imaging

authors： Hyder F,Renken R,Kennan RP,Rothman DL

更新日期：2000-04-01 00:00:00

abstract：:The successful use of magnetic resonance imaging (MRI) of a moldic fossil dicynodont from the Permian aeolian Hopeman Sandstone Formation of Elgin, Scotland, UK, provides paleontologists with a nondestructive technique for examining fossils preserved in this fashion. For large moldic fossils, medical scanners such as ...

journal_title：Magnetic resonance imaging

authors： Clark ND,Adams C,Lawton T,Cruickshank AR,Woods K

更新日期：2004-02-01 00:00:00