Signal Intensity of the Wall of Brain Abscess on MRI: Emphasis on T2-, Proton Density-weighted and FLAIR Image

2000 ◽  
Vol 42 (1) ◽  
pp. 9
Author(s):  
H T Rim ◽  
W S Choi ◽  
E J Kim ◽  
Yup Yoon ◽  
J H Kwak ◽  
...  
Keyword(s):  
Brain Abscess ◽  
Signal Intensity ◽  
Proton Density ◽  
Flair Image

Case 13.12

2014 ◽  
pp. 636-637
Author(s):  
Christine U. Lee ◽  
James F. Glockner
Keyword(s):  
Skeletal Muscle ◽  
Signal Intensity ◽  
Chest Ct ◽  
Inversion Recovery ◽  
Double Inversion Recovery ◽  
Proton Density ◽  
Chest Discomfort

52-year-old woman with chest discomfort; chest CT revealed an indeterminate mediastinal lesion Axial proton density-weighted double inversion recovery FSE images (Figure 13.12.1) demonstrate a large mildly heterogeneous lesion with moderately increased signal intensity relative to adjacent skeletal muscle and a well-defined low-signal-intensity capsule. Axial T2-weighted triple inversion recovery FSE images (...

Double-Contrast Enhanced Mr Imaging of Myocardial Infarction in the Pig

1993 ◽  
Vol 34 (1) ◽  
pp. 64-71 ◽  
Author(s):  
M. Wikström ◽  
H. J. Martinussen ◽  
A. Ericsson ◽  
G. Wikström ◽  
A. Waldenström ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Signal Intensity ◽  
Coronary Artery Occlusion ◽  
Artery Occlusion ◽  
Proton Density ◽  
Double Contrast ◽  
Gadolinium Dtpa ◽  
Diagonal Branch ◽  
Contrast Technique ◽  
T2 Weighted Images

Myocardial infarction was induced by ligating a diagonal branch of the left anterior descending artery in 18 pigs. All pigs were sacrificed 6 h after the occlusion. Dysprosium diethylenetriaminepentaacetic acid bismethylamide (Dy-DTPA-BMA, 1.0 mmol/kg) was administered i.v. to 6 pigs, starting 3 min before sacrifice (injection time approximately 1 min). In a second group of 6 pigs, a double-contrast technique was used, consisting of an i.v. injection of gadolinium-DTPA-BMA (0.4 mmol/kg) 2 h before sacrifice, followed by an i.v. injection of Dy-DTPA-BMA (1.0 mmol/kg) 3 min before sacrifice. Six additional pigs, subjected to 6 h of coronary artery occlusion without administration of contrast medium, served as controls. The hearts were excised and imaged with MR. In the control animals, the infarctions demonstrated an increased signal intensity in the proton density- and T2-weighted images. Administration of Dy-DTPA-BMA primarily improved infarct visualization in the proton density- and T2-weighted images, due to reduction of signal intensity in nonischemic myocardium. The double-contrast technique further improved infarct visualization in all sequences.

scholarly journals Direct clipping of large basilar trunk aneurysm

2015 ◽  
Vol 38 (videosuppl1) ◽  
pp. Video17
Author(s):  
Toshikazu Kimura ◽  
Daichi Nakagawa ◽  
Kensuke Kawai
Keyword(s):  
Signal Intensity ◽  
High Signal Intensity ◽  
High Signal ◽  
Flair Image ◽  
Surgical Clipping ◽  
Link Type

A large basilar trunk aneurysm was incidentally found in a 77-year-old woman in examination for headache. Though it was asymptomatic, high signal intensity was noticed in the brainstem around the aneurysm on FLAIR image of MRI. As she was otherwise healthy, surgical clipping was performed through anterior temporal approach.The video can be found here: http://youtu.be/0soWM8meCW8.

scholarly journals Comparison of 3T and 7T MRI for the visualization of globus pallidus sub-segments

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shuki Maruyama ◽  
Masaki Fukunaga ◽  
Hans-Peter Fautz ◽  
Robin Heidemann ◽  
Norihiro Sadato
Keyword(s):  
Globus Pallidus ◽  
Signal Intensity ◽  
Single Channel ◽  
Spin Echo ◽  
High Signal ◽  
Proton Density ◽  
Internal Globus Pallidus ◽  
Internal Structures ◽  
Electrode Localization ◽  
Straight Lines

AbstractThe success of deep brain stimulation (DBS) targeting the internal globus pallidus (GPi) depends on the accuracy of electrode localization inside the GPi. In this study, we sought to compare visualization of the medial medullary lamina (MML) and accessory medullary lamina (AML) between proton density-weighted (PDW) and T2-weighted (T2W) sequences on 3T and 7T MRI scanners. Eleven healthy participants (five men and six women; age, 19–28 years; mean, 21.5) and one 61-year-old man were scanned using two-dimensional turbo spin-echo PDW and T2W sequences on 3T and 7T MRI scanners with a 32-channel receiver head coil and a single-channel transmission coil. Profiles of signal intensity were obtained from the pixel values of straight lines over the GP regions crossing the MML and AML. Contrast ratios (CRs) for GPe/MML, GPie/MML, GPie/AML, and GPii/AML were calculated. Qualitatively, 7T visualized both the MML and AML, whereas 3T visualized the MML less clearly and hardly depicted the AML. The T2W sequence at 7T yielded significantly higher CRs for GPie/MML, GPie/AML, and GPii/AML than the PDW sequence at 7T or 3T. The T2W sequence at 7T allows visualization of the internal structures of GPi segments with high signal intensity and contrast.

Central Spinal Cord Injury: Magnetic Resonance Imaging Confirmation and Operative Considerations

Neurosurgery ◽  
1988 ◽  
Vol 22 (2) ◽  
pp. 340-347 ◽  
Author(s):  
John L. Fox ◽  
Louis Wener ◽  
Dale C. Drennan ◽  
Herbert J. Manz ◽  
Daniel J. Won ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Magnetic Resonance ◽  
Signal Intensity ◽  
High Signal ◽  
Proton Density ◽  
Resonance Imaging ◽  
Cord Injury ◽  
Central Cord Syndrome

Abstract A case of central cervical spinal cord injury, confirmed by magnetic resonance imaging (MRI) and treated by myelotomy, is presented. After recovering well from his central cord syndrome and walking with assistance, the patient developed a rapidly progressive myelopathy beginning 2 months after injury. His main injury localized clinically to the C8, T1 level; but central cord abnormalities were identified 3 months after injury at the C6 level by MRI: a high signal intensity on the proton density sequence and a low-signal intensity on the T1-weighted sequence. At operation 4½; months after his injury and 1 month after complete paraplegia, a myelotomy at C6 failed to reveal any cavity (syrinx) but instead disclosed only intense gliosis inside a slightly atrophic spinal cord. Rapid clinical improvement ensued. Secondary syringomyelia may be an endstage condition after spinal cord insults that trigger a progressive, pathophysiological reaction leading to central cord necrosis. In selected cases, myelotomy may interrupt this MRI-identified, nosogenic process before cavitation has occurred. (Neurosurgery 22:340-347, 1988)

Case 13.25

2014 ◽  
pp. 661-662
Author(s):  
Christine U. Lee ◽  
James F. Glockner
Keyword(s):  
Chest Pain ◽  
Right Ventricular ◽  
Signal Intensity ◽  
Ventricular Free Wall ◽  
Proton Density ◽  
Free Wall ◽  
Shortness Of Breath ◽  
Right Ventricular Free Wall ◽  
History Of ◽  
The Right

27-year-old man with a 3-month history of chest pain and mild shortness of breath Four-chamber SSFP image (Figure 13.25.1) demonstrates a large well-defined mass in the right ventricular free wall. Four-chamber double (Figure 13.25.2) and triple (Figure 13.25.3) inversion recovery FSE images with proton density- and T2-weighting reveal mildly decreased signal intensity relative to myocardium. Four-chamber MDE image (...

Case 13.16

2014 ◽  
pp. 643-644
Author(s):  
Christine U. Lee ◽  
James F. Glockner
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Signal Intensity ◽  
Left Atrial ◽  
Interatrial Septum ◽  
High Signal Intensity ◽  
High Signal ◽  
Proton Density ◽  
Cine Ssfp ◽  
Artery Disease

72-year-old woman with known coronary artery disease; echocardiography noted a possible left atrial mass, and MRI was suggested for further assessment Horizontal long-axis images from a cine SSFP acquisition (Figure 13.16.1) demonstrate dumbbell-shaped widening of the interatrial septum with uniform high signal intensity. Axial double inversion recovery FSE proton density-weighted images (...

Case 13.26

2014 ◽  
pp. 663-664
Author(s):  
Christine U. Lee ◽  
James F. Glockner
Keyword(s):  
Physical Examination ◽  
Signal Intensity ◽  
Cardiac Mass ◽  
Inversion Recovery ◽  
Double Inversion Recovery ◽  
Proton Density ◽  
Black Blood ◽  
Heart Murmur ◽  
Inversion Recovery Image

62-year-old asymptomatic man with a heart murmur on physical examination; echocardiography revealed a cardiac mass, and MRI was requested for further characterization Sagittal oblique black-blood double (Figure 13.26.1) and triple (Figure 13.26.2) inversion recovery FSE images through the RVOT demonstrate a well-circumscribed ovoid mass with markedly increased signal intensity on the T2-weighted triple inversion recovery image. Axial proton density-weighted double inversion recovery images (...

Brain abscess and necrotic or cystic brain tumor: discrimination with signal intensity on diffusion-weighted MR imaging.

1998 ◽  
Vol 171 (6) ◽  
pp. 1487-1490 ◽  
Author(s):  
Y J Kim ◽  
K H Chang ◽  
I C Song ◽  
H D Kim ◽  
S O Seong ◽  
...  
Keyword(s):  
Brain Tumor ◽  
Mr Imaging ◽  
Brain Abscess ◽  
Signal Intensity ◽  
Diffusion Weighted

Interactive near-real-time high-resolution imaging for MR-guided lumbar interventions using ZOOM imaging in an open 1.0 Tesla MRI system – initial experience

2015 ◽  
Vol 60 (6) ◽  
Author(s):  
Marcus R. Makowski ◽  
Martin Jonczyk ◽  
Florian Streitparth ◽  
Felix Guettler ◽  
Hendrik Rathke ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Signal Intensity ◽  
Facet Joint ◽  
Pulse Sequence ◽  
Signal To Noise Ratio ◽  
Proton Density ◽  
Sequence Design ◽  
Noise Ratio ◽  
The Cost ◽  
Weighted Sequences

AbstractDifferent techniques for magnetic resonance-guided lumbar interventions have been introduced in recent years. Appropriate pulse sequence design is crucial since high spatial resolution often comes at the cost of lower temporal resolution. The purpose of this study was to evaluate the value of accelerated reduced field of view (ZOOM)-based imaging sequences for lumbar interventions.ZOOM imaging was used in 31 interventions (periradicular, facet joint, epidural infiltrations, and discography) performed in 24 patients (10 women, 14 men; age 43±13.3 years). Signal-to-noise ratio and contrast-to-noise ratio (CNR) were determined and retrospectively compared with standard preinterventional (T2 weighted), peri-interventional (proton density), and postinterventional (spectral presaturation with inversion recovery [SPIR]) imaging. Needle artifacts were assessed by direct measurement as well as with parallel and perpendicular needle profiles. Puncture times were compared to similar interventions previously performed in our department.No significant differences in signal intensities (standard/ZOOM: 152.0/151.6; p=0.136) and CNR values (2.0/4.0; p=0.487) were identified for T2-weighted sequences. The needle artifact signal intensity was comparable (648.1/747.5; p=0.172) for peri-interventional imaging. Standard interventional (fat needle: 43.8/23.4; p<0.001; muscle needle: 6.2/2.4; p<0.001) and SPIR sequences (43.3/13.9; p=0.010) showed a higher CNR than corresponding ZOOM sequences did. Needle artifacts were larger in ZOOM (2.4 mm/2.9 mm; p=0.005). The profiles revealed that ZOOM imaging delivers more overall signal intensity. The turning points of both profiles were comparable. ZOOM reduced intervention times significantly (329.1 s/228.5 s; p=0.026).ZOOM imaging is a feasible interactive sequence for lumbar interventions. It ameliorates the tradeoff between image quality and temporal resolution. Moreover, the sequence design reduces intervention times significantly.

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