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：:Biexponential T(2) relaxation of the localized water signal can be used for segmentation of spectroscopic volumes. To assess the specificity of the components an iterative relaxation measurement of the localized water signal (STEAM, 12 echo times, geometric spacing from 30 ms to 2000 ms) was combined with magnetizatio...

journal_title：Magnetic resonance imaging

authors： Helms G,Piringer A

更新日期：2001-07-01 00:00:00

abstract：:A simple model for estimating temperature distribution within the frozen region during cryo ablation was tested for accuracy. Freezing experiments were conducted in both ex vivo and in vivo porcine livers. Temperature was measured during freezing using a fiber-optic temperature sensor. Three-dimensional MR images were...

journal_title：Magnetic resonance imaging

authors： Samset E,Mala T,Edwin B,Gladhaug I,Søreide O,Fosse E

更新日期：2001-06-01 00:00:00

abstract：:The purpose of this investigation is to evaluate the positioning and to confirm the volume concept of the Lea's Shield diaphragm utilizing MR imaging. We evaluated the device in two women, one nulliparous and one multiparous. We were able to comprehensively evaluate the device in both patients and answer all questions...

journal_title：Magnetic resonance imaging

authors： Maldjian C,Pelosi MA 2nd,Pelosi MA 3rd,Adam R

更新日期：2001-06-01 00:00:00

abstract：:We report on experiments to characterize internal magnetic field gradients that are caused by magnetic susceptibility differences between the solid phase and the fluids filling the pore space. Our measurements focus on low-field relaxometry of brine and oil in sandstones from various reservoirs around the world. Our r...

journal_title：Magnetic resonance imaging

authors： Appel M,Freeman JJ,Gardner JS,Hirasaki GH,Zhang QG,Shafer JL

更新日期：2001-04-01 00:00:00

abstract：:New applications of the NMR-MOUSE (mobile universal surface explorer) to non-destructive quality control of elastomers are reported. One example concern the thermal aging of fast clutches which was probed by measurements of 1H transverse relaxation time. Novel methodological developments show that 1H double-quantum fi...

journal_title：Magnetic resonance imaging

authors： Kühn H,Klein M,Wiesmath A,Demco DE,Blümich B,Kelm J,Gold PW

更新日期：2001-04-01 00:00:00

abstract：:An NMR technique is described which allows the observation of ionic charge carriers moving in the electric field within a porous system saturated with electrolyte solution. This method, which was recently developed in our laboratory, gives experimental access to the study of electric transport in disordered media on a...

journal_title：Magnetic resonance imaging

authors： Holz M,Heil SR,Schwab IA

更新日期：2001-04-01 00:00:00

abstract：:One of the most critical structural parameters in elastomeric materials is the density of cross-linking between the polymeric chains. This chemical feature greatly affects chain motions and is determinant in controlling mechanical properties of the final product. NMR techniques are widely and efficiently applied to in...

journal_title：Magnetic resonance imaging

authors： Borgia GC,Fantazzini P,Ferrando A,Maddinelli G

更新日期：2001-04-01 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：:B(1) Field inhomogeneity and the relative effects of dielectric resonances are analyzed within the context of ultra high field MRI. This is accomplished by calculating the electromagnetic fields inside spherical phantoms and within a human head model in the presence and absence of an RF coil. These calculations are th...

journal_title：Magnetic resonance imaging

authors： Ibrahim TS,Lee R,Abduljalil AM,Baertlein BA,Robitaille PM

更新日期：2001-02-01 00:00:00

abstract：:L-2-Chloropropionic acid (L-CPA) is selectively toxic to rat cerebellar granule cells; necrosis is first observed about 36 hours after administration of L-CPA (750 mg/kg p.o.) becoming more marked by 48 h. Parallel to the onset of cell death an increase in cerebellar water content and sodium concentration has been rep...

journal_title：Magnetic resonance imaging

authors： Williams RE,Prior M,Bachelard HS,Waterton JC,Checkley D,Lock EA

更新日期：2001-02-01 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：:Changes in both blood flow and blood oxygenation determine the functional MRI (fMRI) signal. In the present study factors responsible for blood oxygenation (e.g., FiO(2)) were held constant so that changes in pixel count would above all reflect changes in regional cerebral blood flow (rCBF). Continuous positive airway...

journal_title：Magnetic resonance imaging

authors： Lorenz IH,Kolbitsch C,Hörmann C,Schocke M,Kremser C,Zschiegner F,Felber S,Benzer A

更新日期：2001-01-01 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：:Quantitative processing of NMR relaxation images depends on the characteristics of the used fitting algorithm. Therefore several common fitting algorithms are compared for decay curves with low signal-to-noise ratios. The use of magnitude data yields a non-zero base line, and is shown to result in an overestimation of...

journal_title：Magnetic resonance imaging

authors： van der Weerd L,Vergeldt FJ,Adrie de Jager P,Van As H

更新日期：2000-11-01 00:00:00

abstract：:Functional magnetic resonance imaging favors the use of multi-slice gradient-recalled echo-planar imaging due to its short image acquisition times, whole brain coverage and sensitivity to BOLD contrast. However, despite its advantages, gradient-recalled echo-planar imaging also is sensitive to static magnetic field gr...

journal_title：Magnetic resonance imaging

authors： Cordes D,Turski PA,Sorenson JA

更新日期：2000-11-01 00:00:00

abstract：:Merkel cell carcinoma (MCC) is a rare malignant tumor of the skin and often is diagnosed histologically as lymphoma, melanoma and even metastatic small cell carcinoma of the lung (SCCL). Classified as a neuroendocrine tumor, clinically it originates in the head and neck region and may present with metastatic disease a...

journal_title：Magnetic resonance imaging

authors： Moayed S,Maldjianb C,Adam R,Bonakdarpour A

更新日期：2000-10-01 00:00:00

abstract：:Eighty-nine cases after anterior cruciate ligaments (ACL) reconstruction were followed prospectively with magnetic resonance imaging (MRI). The patients were examined using axial and sagittal MRI at least twice during the postoperative evaluation of reconstructed ACL. Two cases of pretibial cyst formation were observe...

journal_title：Magnetic resonance imaging

authors： Deie M,Sumen Y,Ochi M,Murakami Y,Fujimoto E,Ikuta Y

更新日期：2000-10-01 00:00:00

abstract：:The CNS involvement is frequently found in human immunodeficiency virus (HIV) infection. The purpose of our study was to determine whether proton magnetic resonance spectroscopy (MRS) could detect early brain involvement in neurologically asymptomatic HIV-infected patients with normal MR imagings and to find the corre...

journal_title：Magnetic resonance imaging

authors： Suwanwelaa N,Phanuphak P,Phanthumchinda K,Suwanwela NC,Tantivatana J,Ruxrungtham K,Suttipan J,Wangsuphachart S,Hanvanich M

更新日期：2000-09-01 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：:The objective of this study was to describe magnetic resonance (MR) findings with a 1.5T imager for hepatic parenchymal changes after proton beam radiotherapy. Thirty-two patients who received proton radiotherapy with doses of 50-87 Gy underwent MR imaging 1-75 months (mean 22 months) after the start of irradiation. A...

journal_title：Magnetic resonance imaging

authors： Onaya H,Itai Y,Yoshioka H,Ahmadi T,Niitsu M,Okumura T,Akine Y,Matsuzaki Y,Doi M,Tsuji H,Tsujii H

更新日期：2000-07-01 00:00:00

abstract：:Magnetic resonance imaging (MRI) has been applied to assess kidney function in normal rats by monitoring the passage of the extracellular contrast agent GdDOTA. High-resolution images have been obtained using either the rapid acquisition with relaxation enhancement (RARE) or the snapshot pulse sequence. The latter was...

journal_title：Magnetic resonance imaging

authors： Baumann D,Rudin M

更新日期：2000-06-01 00:00:00

abstract：:Functional magnetic resonance imaging (fMRI) was used to investigate the spatial distribution of cortical activation in frontal and parietal lobes during auditory and visual oddball tasks in 10 healthy subjects. The purpose of the study was to compare activation within auditory and visual modalities and identify commo...

journal_title：Magnetic resonance imaging

authors： Stevens AA,Skudlarski P,Gatenby JC,Gore JC

更新日期：2000-06-01 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：:The purpose of this study was to evaluate the value of Ferumoxide-enhanced magnetic resonance (MR) imaging in the detection of hepatic metastases in high-risk patients treated for colorectal cancer that have rising CEA. We used 19 patients treated previously for colorectal cancer with rising CEA levels underwent an un...

journal_title：Magnetic resonance imaging

authors： Said B,McCart JA,Libutti SK,Choyke PL

更新日期：2000-04-01 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：:A new magnetic resonance imaging technique was applied to the Taylor-Couette and spiral Poiseuille (Taylor-Couette with superposed mean axial flux) flows for the first time. The experimental technique is a combination of spatial tagging methods and a snapshot FLASH imaging sequence, which allows the full-field visuali...

journal_title：Magnetic resonance imaging

authors： Moser KW,Raguin LG,Harris A,Morris HD,Georgiadis J,Shannon M,Philpott M

更新日期：2000-02-01 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：:The site-dependent variations in trabecular bone morphology were studied in the rat tibia by magnitude and phase difference three-dimensional nuclear magnetic resonance microscopy and image processing, and the implications of ovariectomy were evaluated. Specimens excised from the proximal tibial metaphysis in ovariect...

journal_title：Magnetic resonance imaging

authors： Takahashi M,Wehrli FW,Hwang SN,Wehrli SL

更新日期：2000-01-01 00:00:00

abstract：:A new phantom and evaluation method for experimental evaluation of 1H-magnetic resonance spectroscopy single volume localization techniques regarding signal contamination (C), defined as the part of the signal originating outside the volume of interest, is presented. The quality assessment method is based on a spheric...

journal_title：Magnetic resonance imaging

authors： Burtscher IM,Johansson E,Holtås S,Ståhlberg F

更新日期：1999-12-01 00:00:00

abstract：:The purpose of this study was to evaluate the diagnostic potential of a high-resolution magnetic resonance (MR) venography technique in patients with cerebral arteriovenous malformations (AVMs). A high-resolution 3D gradient echo sequence was used with a long echo time TE to obtain venous information down to sub-pixel...

journal_title：Magnetic resonance imaging

authors： Essig M,Reichenbach JR,Schad LR,Schoenberg SO,Debus J,Kaiser WA

更新日期：1999-12-01 00:00:00

abstract：:Relaxation times estimation methods play a central role in various problems, such as magnetic resonance (MR) hardware calibration, tissue characterization, or temperature measurement. Previous studies have proposed optimization criteria to estimate the relaxation time T1 faster than with a multipoint method leading to...

journal_title：Magnetic resonance imaging

authors： Imran J,Langevin F,Saint-Jalmes H

更新日期：1999-11-01 00:00:00

abstract：:The purpose of this study was to compare the relative conspicuity of the pancreaticobiliary tree on respiratory-triggered three-dimensional turbo spin echo (3D TSE RT) and breath hold single-shot turbo spin echo (SSTSE BH) acquisitions respectively in MRCP imaging. Both techniques were applied to 61 patients with clin...

journal_title：Magnetic resonance imaging

authors： Papanikolaou N,Karantanas AH,Heracleous E,Costa JC,Gourtsoyiannis N

更新日期：1999-11-01 00:00:00

abstract：:Magnetic resonance microscopy of skin from hairless rats under the influence of electrical fields was conducted for two cases: 1) low voltage constant electrical fields and 2) high-voltage short pulse, electrical fields. Under conditions of the low voltage and low current iontophoresis, i.e., 0 to 20 V, and 0 to 0.5 m...

journal_title：Magnetic resonance imaging

authors： Caban JB,Moerland TS,Gibbs SJ,McFadden L,Locke BR

更新日期：1999-10-01 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：: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：:Idiopathic dilatation of the pulmonary artery (IDPA) is a rare congenital disease which is usually detected fortuitously on chest x-ray, thus radiologists must be aware of this clinical entity. This report describes four cases to which Magnetic Resonance Imaging (MRI) played a major role in diagnosing IDPA and in dete...

journal_title：Magnetic resonance imaging

authors： Ugolini P,Mousseaux E,Sadou Y,Sidi D,Mercier LA,Paquet E,Gaux JC

更新日期：1999-07-01 00:00:00

abstract：:With the conventional 3D MR angiographic sequences, it is difficult to prescribe multiple phases in different orientations, though multiple phases may be prescribed in the same orientation as the initial scan. Magnetic resonance angiography (MRA) was performed in which three slabs were prescribed in different orientat...

journal_title：Magnetic resonance imaging

authors： Shetty AN,Bis KG

更新日期：1999-07-01 00:00:00

abstract：:The ripening of the tomato fruit was delayed for several days (average 5 days) by a 1-day heat treatment at 42 degrees C. Ethylene production increased during the first 3 h, but, after 6 h inhibition was almost total in tomato fruit incubated at 42 degrees C. However, recovery of ethylene production was rapid if fruit...

journal_title：Magnetic resonance imaging

authors： Iwahashi Y,Horigane AK,Yoza K,Nagata T,Hosoda H

更新日期：1999-06-01 00:00:00

abstract：:In this study, in order to differentiate cavernous hemangioma and hepatic metastases, rapid acquisition relaxation enhanced (RARE) sequence was used. First, in vivo measurements of T1, T2 relaxation times and proton density were obtained using T1, T2 calculation protocol (TOMIKON S50, 0.5T) and multipoint techniques. ...

journal_title：Magnetic resonance imaging

authors： Jafari F,Nayeri N,Tahsini M,Khodadoust AA

更新日期：1999-06-01 00:00:00