Artifacts in chemical shift selective imaging.

abstract：OBJECTIVE:Equivalent cross-relaxation rate imaging (ECRI) is an MRI technique used to evaluate qualitative changes in protein-water interactions. We aimed to prospectively evaluate the utility of ECRI for classification of adipocytic tumors. MATERIALS AND METHODS:Institutional Review Board approval was obtained and al...

journal_title：Magnetic resonance imaging

authors： Okuda H,Matsushima S,Sugiura H,Yamada K,Hamada S,Nishida Y,Ishiguro N

更新日期：2014-04-01 00:00:00

abstract：:Increasing scientific interest in the zebrafish as a model organism across a range of biomedical and biological research areas raises the need for the development of in vivo imaging tools appropriate to this subject. Development of the embryonic and early stage forms of the subject can currently be assessed using opti...

journal_title：Magnetic resonance imaging

authors： Merrifield GD,Mullin J,Gallagher L,Tucker C,Jansen MA,Denvir M,Holmes WM

更新日期：2017-04-01 00:00:00

abstract：:The purpose of this study was to correlate the MRI features of the anal canal with histologic findings. T1- and T2-weighted MR images of nine anal canals were obtained after fixation in 10% formalin. In three specimens, imaging was repeated after removal of histologic layers with a dissecting microscope. Corresponding...

journal_title：Magnetic resonance imaging

authors： Van Beers BE,Kartheuser A,Delos MA,Grandin C,Detry R,Jamart J,Pringot J

更新日期：1996-01-01 00:00:00

abstract：:In the longitudinal study of multiple sclerosis (MS) lesions, varying position of the patient inside the MRI scanner is one of the major sources of assessment errors. We propose to use analytical indices that are invariant to spatial orientation to describe the lesions, rather than focus on patient repositioning or im...

journal_title：Magnetic resonance imaging

authors： Goldberg-Zimring D,Achiron A,Warfield SK,Guttmann CR,Azhari H

更新日期：2004-07-01 00:00:00

abstract：:Constrained energy minimization (CEM) has proven highly effective for hyperspectral (or multispectral) target detection and classification. It requires a complete knowledge of the desired target signature in images. This work presents "Unsupervised CEM (UCEM)," a novel approach to automatically target detection and cl...

journal_title：Magnetic resonance imaging

authors： Lin GC,Wang CM,Wang WJ,Sun SY

更新日期：2010-06-01 00:00:00

abstract：:The midcalf muscles of eight patients who had peripheral arterial occlusive disease were evaluated by exercise MRI before and after bypass surgery or percutaneous transluminal angioplasty. MRI showed a high intensity of these muscles, especially the posterior muscles, after exercise in all patients before intervention...

journal_title：Magnetic resonance imaging

authors： Yoshioka H,Anno I,Kuramoto K,Matsumoto K,Jikuya T,Itai Y

更新日期：1995-01-01 00:00:00

abstract：:The goal of this study was to determine whether presurgical metabolite levels measured by 3D MR Spectroscopic Imaging (MRSI) can accurately detect viable cancer within human brain tumor masses. A total of 31 patients (33 exams, 39 pathology correlations) with brain tumors were studied prior to surgical biopsy and/or r...

journal_title：Magnetic resonance imaging

authors： Vigneron D,Bollen A,McDermott M,Wald L,Day M,Moyher-Noworolski S,Henry R,Chang S,Berger M,Dillon W,Nelson S

更新日期：2001-01-01 00:00:00

abstract：:Increased bone water content resulting from repetitive patellofemoral joint overloading has been suggested to be a possible mechanism underlying patellofemoral pain (PFP). To date, it remains unknown whether persons with PFP exhibit elevated bone water content. The purpose of this study was to determine whether recrea...

journal_title：Magnetic resonance imaging

authors： Ho KY,Hu HH,Colletti PM,Powers CM

更新日期：2014-09-01 00:00:00

abstract：PURPOSE:To establish an optimized sequence design for fast acceleration of arterial spin labeling (ASL)-based time-resolved magnetic resonance angiography (MRA) by acquisition of control and labeled images in the same shot (fast ACTRESS) and a scan time of <1min, for the evaluation of intracranial vessels. MATERIALS A...

journal_title：Magnetic resonance imaging

authors： Sugimori H,Fujima N,Suzuki Y,Hamaguchi H,Ishizaka K,Kudo K

更新日期：2017-11-01 00:00:00

abstract：:Pelvic MR (41 patients) and CT (36 patients) examinations were performed on 14 females with a primary pelvic complaint, and on 28 females with a suspicion of local recurrent disease of gynecologic malignant tumor. Benign cystic tumors were found in eight patients, five patients had endometriomas, one had a lymphoma, a...

journal_title：Magnetic resonance imaging

authors： Varpula M

更新日期：1993-01-01 00:00:00

abstract：PURPOSE:To evaluate the feasibility of an optimized bright blood MRI protocol at 3 T in combination with contrast agent administration for the detection and characterization of aortic high-risk plaques for the improved workup of acute stroke patients. MATERIALS AND METHODS:ECG synchronized T1-weighted 3D gradient echo...

journal_title：Magnetic resonance imaging

authors： Markl M,Dudler P,Fydrychowicz A,Strecker C,Weiller C,Hennig J,Harloff A

更新日期：2008-04-01 00:00:00

abstract：:The optics of the ocular lens are determined by its geometry (shape and volume) and its inherent gradient of refractive index (water to protein ratio), which are in turn maintained by unique cellular physiology known as the lens internal microcirculation system. Previously, magnetic resonance imaging (MRI) has been us...

journal_title：Magnetic resonance imaging

authors： Muir ER,Pan X,Donaldson PJ,Vaghefi E,Jiang Z,Sellitto C,White TW

更新日期：2020-07-01 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：:MRI is applied to the visualisation of wetting heterogeneities evidenced by water proton T1 contrast at 0.1 T. Water saturated Fontainebleau sandstone samples were examined either in their original water-wet condition, or after silanation. T1, T2Hahn, and T2CPMG were measured for several porosities. T1 and T2CPMG of h...

journal_title：Magnetic resonance imaging

authors： Guillot G,Chardaire-Rivière C,Bobroff S,Le Roux A,Roussel JC,Cuiec L

更新日期：1994-01-01 00:00:00

abstract：:Two parallel imaging methods used for first-pass myocardial perfusion imaging were compared in terms of signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) and image artifacts. One used adaptive Time-adaptive SENSitivity Encoding (TSENSE) and the other used GeneRalized Autocalibrating Partially Parallel Acquisi...

journal_title：Magnetic resonance imaging

authors： Irwan R,Lubbers DD,van der Vleuten PA,Kappert P,Götte MJ,Sijens PE

更新日期：2007-06-01 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：:A dextran-Gd-DTPA compound has been recently synthesized utilizing 70,800 Da molecular weight dextran. This polymeric contrast agent for magnetic resonance imaging has been found chemically to be very stable and to demonstrate in vitro improved relaxivities of 1.5 to 2.3 times that of monomeric Gd-DTPA at 100 MHz. Thi...

journal_title：Magnetic resonance imaging

authors： Li KC,Quisling RG,Armitage FE,Richardson D,Mladinich C

更新日期：1992-01-01 00:00:00

abstract：:The purpose of this study was to develop a multi-shot dual-echo breathhold fast spin echo technique (DFSE) and compare it with conventional spin echo (T2SE) for T(2)-weighted MR imaging of liver lesions. The DFSE acquisition (EffTE1/EffTE2/TR = 66/143/2100 ms) imaged 5 sections per 17 s breathhold. T2SE imaging (TE1/T...

journal_title：Magnetic resonance imaging

authors： Rydberg JN,Tervonen OA,Rydberg DB,Lomas DJ,Ehman RL,Riederer SJ

更新日期：2000-02-01 00:00:00

abstract：:Non-invasive assessment of cartilage properties, specifically water content, could prove helpful in the diagnosis of early degenerative joint diseases. Transverse relaxation times T(2) of human articular cartilage (34 cartilage slices of three donors) were measured on a pixel-by-pixel basis in a clinical whole body MR...

journal_title：Magnetic resonance imaging

authors： Lüsse S,Claassen H,Gehrke T,Hassenpflug J,Schünke M,Heller M,Glüer CC

更新日期：2000-05-01 00:00:00

abstract：OBJECTIVE:The purpose of this study was to analyze flow patterns in the pulmonary circulation of healthy volunteers by using 4D flow magnetic resonance imaging. MATERIALS AND METHODS:The study was approved by the local ethics committee and all subjects gave written informed consent. Eighteen volunteers underwent a 4D ...

journal_title：Magnetic resonance imaging

authors： Bächler P,Pinochet N,Sotelo J,Crelier G,Irarrazaval P,Tejos C,Uribe S

更新日期：2013-02-01 00:00:00

abstract：:The applicability of the synthetic manganese porphyrin MnTPPS as tumor-selective MRI-contrast agent for brain tumors was investigated quantitatively by in vivo relaxometry. To exclude toxic effects of side products, the purification method for MnTPPS was improved. As a result, MnTPPS+Cl- (free acid) with a purity of m...

journal_title：Magnetic resonance imaging

authors： Bockhorst K,Hoehn-Berlage M,Ernestus RI,Tolxdorf T,Hossmann KA

更新日期：1993-01-01 00:00:00

abstract：:Gadolinium DTPA was evaluated as an intravenous contrast agent for magnetic resonance imaging in 15 patients with primary or secondary intracranial neoplastic disease. T1 and T2 weighted images were obtained prior to contrast administration. T1 weighted spin echo 35/800 (TE/TR) images were utilized to detect enhanceme...

journal_title：Magnetic resonance imaging

authors： Runge VM,Schoerner W,Niendorf HP,Laniado M,Koehler D,Claussen C,Felix R,James AE Jr

更新日期：1985-01-01 00:00:00

abstract：:Transverse relaxation rates for Carr-Purcell-Meiboom-Gill (CPMG) sequences increase with inter-echo time in presence of microscopic magnetic field inhomogeneities due to nuclear spin diffusion. For a weak field approximation that includes diffusion effects, the CPMG relaxation rate shift for proton diffusion around ca...

journal_title：Magnetic resonance imaging

authors： Kurz FT,Kampf T,Buschle LR,Heiland S,Schlemmer HP,Bendszus M,Ziener CH

更新日期：2016-09-01 00:00:00

abstract：:Magic-angle sample spinning is one of the cornerstones in high-resolution NMR of solid and semisolid materials. The technique enhances spectral resolution by averaging away rank 2 anisotropic spin interactions, thereby producing isotropic-like spectra with resolved chemical shifts and scalar couplings. In principle, i...

journal_title：Magnetic resonance imaging

authors： Sakellariou D,Meriles CA,Martin RW,Pines A

更新日期：2005-02-01 00:00:00

abstract：:We propose a novel processing method for reducing shading artifacts in quantitative susceptibility mapping (QSM) for prostate imaging. In the conventional method, calculation errors in the boundary regions between water and fat cause shading artifacts that degrade the image quality for QSM. In the proposed method, wat...

journal_title：Magnetic resonance imaging

authors： Sato R,Shirai T,Soutome Y,Bito Y,Ochi H

更新日期：2020-02-01 00:00:00

abstract：:The functional value of TurboFLASH MR imaging in the assessment of dynamic contrast enhancement and renal perfusion anomalies was evaluated in seven patients, who also underwent renal scintigraphy in baseline conditions. The basal renograms obtained from MAG-3 scintigraphy (mercapto acetyl triglycine, MAG3-S) and from...

journal_title：Magnetic resonance imaging

authors： Laissy JP,Faraggi M,Lebtahi R,Soyer P,Brillet G,Méry JP,Menu Y,Le Guludec D

更新日期：1994-01-01 00:00:00

abstract：:The mapping of the human brain white matter fiber networks relative to deep subcortical and cortical gray matter requires high spatial resolution which is challenged by the low signal-to-noise ratio. The purpose of this short report was to introduce a whole brain high spatial resolution diffusion tensor imaging (DTI) ...

journal_title：Magnetic resonance imaging

authors： Hasan KM,Kamali A,Kramer LA

更新日期：2009-06-01 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：: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：:Diffusion tensor imaging (DTI) is potentially sensitive to collagen degeneration in cartilage. In this study, DTI was measured on human cartilage samples with interventions of trypsin and collagenase. The measured preferred diffusion direction was consistent with the zonal structure of collagen network. The glycosamin...

journal_title：Magnetic resonance imaging

authors： Deng X,Farley M,Nieminen MT,Gray M,Burstein D

更新日期：2007-02-01 00:00:00