Magnetic Resonance Imaging

Items from 1 to 20 out of 5,079 results

article

Short echo time proton spectroscopy of the brain in healthy volunteers using an insert gradient head coil

Peter Gideon, Else Rubæk Danielsen, Monika Schneider, Ole Henriksen

Magnetic Resonance Imaging > 1995 > 13 > 1 > 105-109

An insert gradient head coil with built-in X, Y, and Z gradients was used for localized proton spectroscopy in the brain of healthy volunteers, using short echo time stimulated echo acquisition mode (STEAM) sequences. Volume of interest size was 3.4 ml, repetition time was 6.0 s, and echo times were 10 and 20 ms, respectively. Good quality proton spectra with practically no eddy current artefacts...

article

Image reconstruction of sequentially sampled echo-planar data

Fahmeed Hyder, Douglas L. Rothman, Andrew M. Blamire

Magnetic Resonance Imaging > 1995 > 13 > 1 > 97-103

For echo-planar imaging (EPI), failure to time-reverse alternate echoes results in aliasing in the image. We encountered image artifacts in EPI acquired on a system with sequential sampling. After examining the source of these image artifacts, we concluded that the artifacts were a result of the type of sampling method used in data acquisition and the way the time-reversal of alternate echoes was...

article

Correlation between Gd-enhanced MR imaging and histopathology in treated and untreated 9L rat brain tumors

D.W. Wilkins, G.P. Raaphorst, J.K. Saunders, G.R. Sutherland, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 89-96

Gadolinium-based MR imaging contrast agents cause signal enhancement of intracerebral tumors on T ₁ -weighted MR images because they cross the compromised blood-brain barrier, increasing the T ₁ relaxation rate of extracellular water. Tumor extent measured by Gd-enhanced MR imaging often does not agree with T ₂ -weighted MRI or biopsy measurements, due to possible peritumoral...

article

Tracking of cerebral vessels in MR angiography after highpass filtering

Uwe Klose, Dirk Petersen, Janos Martos

Magnetic Resonance Imaging > 1995 > 13 > 1 > 45-51

Maximum intensity projection (MIP), the commonly used technique for calculating MR-angiograms from three-dimensional (3D) datasets, often fails to visualize small vessels due to superposition of background signal. An improved vascular depiction can be reached by application of a connectivity algorithm, but a very good delimitation of vessel signals from signals of stationary tissue is required for...

article

Pulsewave velocity measurement using a new real-time MR-method

Michael Bock, Lothar R. Schad, Edgar Müller, Walter J. Lorenz

Magnetic Resonance Imaging > 1995 > 13 > 1 > 21-29

A new, one-dimensional method for the measurement of pulsewave velocities using real-time magnetic resonance (MR) imaging is presented. The measurement sequence is essentially of a RACE-type (Real Time Acquisition and Evaluation) with interleaved acquisition in two not necessarily parallel slices. In each slice the blood flow velocity perpendicular to the slice orientation was monitored. From the...

article

Quality assessment in in vivo NMR spectroscopy: I. introduction, objectives, and activities

F. Podo, W.M.M.J. Bovée, J. de Certaines, D. Leibfritz, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 117-121

By enabling noninvasive measurements of tissue biochemistry, nuclear magnetic resonance spectroscopy (MRS) provides a unique means of characterizing tissues. Differences in equipment, techniques, and methodology between different laboratories cause major difficulties when comparing results, whether from measurements of tissue metabolism, or from the effects of different therapies. This is of concern...

article

Quality assessment in in vivo NMR spectroscopy: V. multicentre evaluation of prototype test objects and protocols for performance assessment in small bore MRS equipment

F.A. Howe, R. Canese, F. Podo, B. Vikhoff, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 159-167

This paper reports the results of multicentre studies aimed at designing, constructing, and evaluating prototype test objects for performance assessment in small-bore MRS systems, by utilizing the test protocols already proposed by the EEC COMAC-BME Concerted Action for clinical MRS equipment. Three classes of test objects were considered: (1) a multicompartment test object for ³ ¹ P...

article

Quality assessment in in vivo NMR spectroscopy: III. clinical test objects: design, construction, and solutions

M.O. Leach, D.J. Collins, S. Keevil, I. Rowland, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 131-137

Based on the requirements of test protocols developed to evaluate clinical MRS single slice and volume localisation sequences, two clinical test objects, STO1 and STO2 have been developed. The properties of a range of potential construction materials have been assessed, demonstrating that the water/Perspex interface produced minimum susceptibility effects. The design of the objects has been evaluated...

article

Magnetic resonance imaging findings in ovarian torsion

Kiran A. Jain

Magnetic Resonance Imaging > 1995 > 13 > 1 > 111-113

article

Quality assessment in in vivo NMR spectroscopy: II. a protocol for quality assessment

W.M.M.J. Bovée, S.F. Keevil, M.O. Leach, F. Podo

Magnetic Resonance Imaging > 1995 > 13 > 1 > 123-129

A protocol has been developed for quality assessment in in vivo NMR spectroscopy (MRS) on whole body and animal systems. The protocol, which has been evaluated in a series of international trials, defines procedures, objects and substances to evaluate the localisation of common slice and volume selection sequences, and to assess other relevant aspects of system performance, including: signal-to-noise;...

article

Relationship between diffusion-weighted MR images, cerebral blood flow, and energy state in experimental brain infarction

Kanehisa Kohno, Mathias Hoehn-Berlage, Günter Mies, Tobias Back, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 73-80

The regional evolution of brain infarction was studied in Wistar rats submitted to remotely controlled thread occlusion of the middle cerebral artery. Occlusion was performed in the magnet of an NMR tomography system to allow continuous recording of diffusion-weighted images. After 30 min (n = 6) or 2 h (n = 9), cerebral blood flow was measured by [ ¹ ⁴ C] iodoantipyrine autoradiography...

article

Reproducibility of MRI-derived measurements of right ventricular volumes and myocardial mass

Peter M.T. Pattynama, Hildo J. Lamb, Edo A. Van der Velde, Rob J. Van der Geest, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 53-63

Magnetic resonance (MR) imaging has been shown to provide accurate measurements of right ventricular (RV) volumes and myocardial mass. The purpose of this study was to evaluate the reproducibility of MR imaging, which in clinical practice may be as important as its absolute accuracy. The reproducibility of MR imaging measurements of the right ventricle was assessed by analyzing 40 serial functional...

article

MRI anatomy of the rat kidney at 1.5 T in different states of hydration

Helen T. Morehouse, Ellen Levee, Lisa States, Jill Zimmerman, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 81-88

The objective of this study was to determine correlation between structural anatomy and surface coil spin-echo MR imaging of the rat kidney and the effect of hydration state on MR signal intensities of the cortex and medulla. Twelve rats were studied in a pilot study with a 3-inch surface coil in a 1.5 T magnet under five different states of hydration. Serum and urine osmolality measurements were...

article

Controlled delivery of Gd-containing liposomes to lymph nodes: surface modification may enhance MRI contrast properties

Vladimir S. Trubetskoy, John A. Cannillo, Alexander Milshtein, Gerald L. Wolf, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 31-37

Surface modification of liposomes containing Gd-diethylenetriaminepentaacetyl-phosphatidylethanolamine (Gd-DTPA-PE) as an amphiphilic paramagnetic label influences their contrast properties as MRI agents. Liposomes with the mean diameter ca. 220 nm and 10% mol content of Gd-DTPA-PE were modified with dextran (molecular weight 6 kDa) or polyethyleneglycol (PEG, molecular weight 5 kDa). The preparations...

article

A modified rat model of middle cerebral artery thread occlusion under electrophysiological control for magnetic resonance investigations

Kanehisa Kohno, Tobias Back, Mathias Hoehn-Berlage, Konstantin-Alexander Hossmann

Magnetic Resonance Imaging > 1995 > 13 > 1 > 65-71

Previous magnetic resonance (MR) investigations of middle cerebral artery (MCA) occlusion in rats were limited by the lack of early post-occlusion MR measurements and/or electrophysiological monitoring. Therefore, we have developed a technique which allows to perform MCA occlusion inside the magnet under simultaneous recording of EEG and direct current (DC) potentials for monitoring the ischemic...

article

Quality assessment in in vivo NMR spectroscopy: VI. multicentre quantification of MRS test signals

R. de Beer, P. Bachert-Baumann, W.M.M.J. Bovée, E. Cady, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 169-176

In this paper the results are presented of a joint European quantitative data-analysis study on a series of in vivo NMR time-domain test signals. The purpose of this study was to investigate, whether the quantitative MRS results from the various European biomedical research-centres can be made more comparable and reproducible. From the results of the study it can be concluded that in case of heavily...

article

Large angle spin-echo imaging

Gino DiIorio, Jeffrey J. Brown, Joseph A. Borrello, William H. Perman, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 39-44

A study was undertaken to assess the use of excitation flip angles greater than 90° for T ₁ weighted spin-echo (SE) imaging with a single 180° refocusing pulse and short TR values. Theoretical predictions of signal intensity for SE images with excitation pulse angles of 90-180° were calculated based on the Bloch equations and then measured experimentally from MR images of MnCl ₂ phantoms...

article

Detection of muscle layer invasion with submillimeter pixel MR images: staging of bladder Carcinoma

Hisatoshi Maeda, Tuneo Kinukawa, Ryouhei Hattori, Nobuo Toyooka, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 9-19

Conventional magnetic resonance (MR) images used for the pelvic organs generally have a pixel size of 1.3 mm 1.3 mm. We obtained images with a higher resolution than conventional images, and evaluated the usefulness of this type of image in staging urinary bladder carcinoma. Twenty-six patients having either transurethral resection of bladder tumor (TUR-BT) or cystectomy were retrospectively...

article

Dynamic contrast-enhanced MR imaging of the liver: parenchymal enhancement patterns

Jeffrey J. Brown, Joseph A. Borrello, Hashim S. Raza, Dennis M. Balfe, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 1-8

A retrospective study of 164 patients undergoing dynamic contrast-enhanced magnetic resonance (MR) imaging was performed to assess hepatic parenchymal enhancement patterns and to correlate these patterns with hepatic function and disease. Rapid T ₁ -weighted images were acquired before and after gadolinium administration. Hepatic enhancement patterns were analyzed blindly by two observers...

article

Quality assessment in in vivo NMR spectroscopy: IV. a multicentre trial of test objects and protocols for performance assessment in clinical NMR spectroscopy

S.F. Keevil, B. Barbiroli, D.J. Collins, E.R. Danielsen, more

Magnetic Resonance Imaging > 1995 > 13 > 1 > 139-157

A multicentre trial of test objects and protocols for performance assessment in single volume and slice selective magnetic resonance spectroscopy (MRS) was conducted by the European Community Concerted Action on MRI and MRS. The trial assessed phosphorus and proton localisation techniques implemented on commercially available MR systems at ten sites in Europe. At each site, a number of parameters...

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MRI (483)
MAGNETIC RESONANCE IMAGING (396)
FMRI (199)
DIFFUSION (132)
BRAIN (118)
DIFFUSION TENSOR IMAGING (89)
LIVER (80)
POROUS MEDIA (79)
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NMR (59)
FUNCTIONAL MRI (55)
DTI (52)
GADOLINIUM (52)
MAGNETIC RESONANCE SPECTROSCOPY (52)
PARALLEL IMAGING (49)
DCE-MRI (48)
COMPRESSED SENSING (47)
SEGMENTATION (45)
WHITE MATTER (45)
DIFFUSION-WEIGHTED IMAGING (40)
SPINAL CORD (40)
BREAST CANCER (39)
RELAXATION (39)
PROSTATE CANCER (38)
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FUNCTIONAL MAGNETIC RESONANCE IMAGING (37)
CEREBRAL BLOOD FLOW (33)
MAGNETIC RESONANCE ANGIOGRAPHY (33)
EPI (32)
QUANTIFICATION (32)
EPILEPSY (31)
HUMAN BRAIN (29)
FLOW (28)
HUMAN (28)
MR IMAGING (28)
SPECTROSCOPIC IMAGING (28)
APPARENT DIFFUSION COEFFICIENT (27)
ARTERIAL SPIN LABELING (27)
CARTILAGE (27)
MAGNETIZATION TRANSFER (26)
NUCLEAR MAGNETIC RESONANCE (26)
IMAGE PROCESSING (25)
MOTION CORRECTION (25)
MR (25)
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PHANTOM (24)
T2 (24)
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GD-DTPA (23)
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RAT (23)
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STROKE (22)
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MR SPECTROSCOPY (21)
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QUANTITATIVE MRI (21)
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MRS (20)
NMR RELAXATION (20)
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BREAST (19)
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DWI (19)
IMAGE RECONSTRUCTION (19)
KIDNEY (19)
MAGNETIC RESONANCE (MR) (19)
MOUSE (19)
T1 (19)
CONTRAST MEDIA (18)
FUNCTIONAL MAGNETIC RESONANCE IMAGING (FMRI) (18)
GD-EOB-DTPA (18)
IRON (18)
SAFETY (18)
TEXTURE ANALYSIS (18)
TISSUE CHARACTERIZATION (18)
TUMOR (18)
ADC (17)
ARTICULAR CARTILAGE (17)
DYNAMIC MRI (17)
FAST IMAGING (17)
FUNCTIONAL IMAGING (17)
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Magnetic Resonance Imaging

Short echo time proton spectroscopy of the brain in healthy volunteers using an insert gradient head coil

Image reconstruction of sequentially sampled echo-planar data

Correlation between Gd-enhanced MR imaging and histopathology in treated and untreated 9L rat brain tumors

Tracking of cerebral vessels in MR angiography after highpass filtering

Pulsewave velocity measurement using a new real-time MR-method

Quality assessment in in vivo NMR spectroscopy: I. introduction, objectives, and activities

Quality assessment in in vivo NMR spectroscopy: V. multicentre evaluation of prototype test objects and protocols for performance assessment in small bore MRS equipment

Quality assessment in in vivo NMR spectroscopy: III. clinical test objects: design, construction, and solutions

Magnetic resonance imaging findings in ovarian torsion

Quality assessment in in vivo NMR spectroscopy: II. a protocol for quality assessment

Relationship between diffusion-weighted MR images, cerebral blood flow, and energy state in experimental brain infarction

Reproducibility of MRI-derived measurements of right ventricular volumes and myocardial mass

MRI anatomy of the rat kidney at 1.5 T in different states of hydration

Controlled delivery of Gd-containing liposomes to lymph nodes: surface modification may enhance MRI contrast properties

A modified rat model of middle cerebral artery thread occlusion under electrophysiological control for magnetic resonance investigations

Quality assessment in in vivo NMR spectroscopy: VI. multicentre quantification of MRS test signals

Large angle spin-echo imaging

Detection of muscle layer invasion with submillimeter pixel MR images: staging of bladder Carcinoma

Dynamic contrast-enhanced MR imaging of the liver: parenchymal enhancement patterns

Quality assessment in in vivo NMR spectroscopy: IV. a multicentre trial of test objects and protocols for performance assessment in clinical NMR spectroscopy

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