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Result : Searchterm 'Signal Intensity' found in 1 term [] and 55 definitions []
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Searchterm 'Signal Intensity' was also found in the following services: 
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News  (5)  Resources  (1)  Forum  (4)  
 
T2 Weighted ImageInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.
 
T2 weighted imaging relies upon local dephasing of spins following the application of the transverse energy pulse. The contrast of a T2 weighted image is predominantly dependent on T2 and the T2 dependence will be increased by using a long echo time.
Fat has a shorter T2 time than water and relaxes or decays more readily than water. Since the amount of transverse magnetization in fat is small, fat generates very little signal on a strong T2 weighted contrast image and appears intermediate to dark. The T2 weighting is stronger with a longer TE. Water has a very high T2 constant, therefore has very high T2 signal and thus appears bright on a T2 contrast image. Cerebral white matter (fat containing) is less intense than grey matter. Flowing blood (flow effects) and haematomas (haemoglobin, haemosiderin) have a variable signal intensity on MR images.
Images created with TR's and TE's to enhance T2 contrast are referred to as T2 weighted images. Both T1 and T2 weighted images are acquired for most medical MRI examinations.
 
Images, Movies, Sliders:
 Lumbar Spine T2 FSE Sagittal  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 Shoulder Axial T2 FatSat FRFSE  Open this link in a new window
    

Courtesy of  Robert R. Edelman
 Lumbar Spine T2 FSE Axial  Open this link in a new window
 
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    • Relaxation Rates
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    • Magnetic Resonance Imaging MRI
    • T2 Time
    • Brain MRI
 
Further Reading:
  Basics:
MYELIN-SELECTIVE MRI: PULSE SEQUENCE DESIGN AND OPTIMIZATION
   by www.imaging.robarts.ca    
T2* cardiac MRI allows prediction of severe reperfusion injury after STEMI
Tuesday, 9 November 2010   by www.medwire-news.md    
  News & More:
New MRI technique offers faster diagnosis of multiple sclerosis
Monday, 1 February 2016   by medicalxpress.com    
MRI measurement tools to help diagnose veterans' traumatic brain injuries
Wednesday, 18 March 2015   by medicalxpress.com    
New MR sequence helps radiologists more accurately evaluate abnormalities of the uterus and ovaries
Thursday, 23 April 2009   by www.eurekalert.org    
Ultrashort echo time (UTE) MRI of the spine in thalassaemia
February 2004   by bjr.birjournals.org    
Searchterm 'Signal Intensity' was also found in the following service: 
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Radiology  (1) Open this link in a new window
Ultrasmall Superparamagnetic Iron OxideInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
(USPIO) The class of the ultrasmall superparamagnetic iron oxide includes several chemically and pharmacologically very distinct materials, which may or may not be interchangeable for a specific use. Some ultrasmall SPIO particles (median diameter less than 50nm) are used as MRI contrast agents (Sinerem®, Combidex®), e.g. to differentiate metastatic from inflammatory lymph nodes. USPIO shows also potential for providing important information about angiogenesis in cancer tumors and could possibly complement MRI helping physicians to identify dangerous arteriosclerosis plaques.
Because of the disadvantageous large T2*//T1 ratio, USPIO compounds are less suitable for arterial bolus contrast enhanced magnetic resonance angiography than gadolinium complexes. The tiny ultrasmall superparamagnetic iron oxides do not accumulate in the RES system as fast as larger particles, which results in a long plasma half-life. USPIO particles, with a small median diameter (less than 10 nm), will accumulate in lymph nodes after an intravenous injection by e.g. direct transcapillary passage through endothelial venules. Once within the nodal parenchyma, phagocytic cells of the mononuclear phagocyte system take up the particles.
As a second way, USPIOs are subsequently taken up from then interstitium by lymphatic vessels and transported to regional lymph nodes. A lymph node with normal phagocytic function takes up a considerable amount and shows a reduction of the signal intensity caused by T2 shortening effects and magnetic susceptibility. Caused by the small uptake of the USPIOs in metastatic lymph nodes, they appear with less signal reduction, and permit the differentiation of healthy lymph nodes from normal-sized, metastatic nodes.
See also Superparamagnetic Contrast Agents, Superparamagnetic Iron Oxide, Very Small Superparamagnetic Iron Oxide Particles, Blood Pool Agents, Intracellular Contrast Agents.
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• View the DATABASE results for 'Ultrasmall Superparamagnetic Iron Oxide' (16).Open this link in a new window


• View the NEWS results for 'Ultrasmall Superparamagnetic Iron Oxide' (2).Open this link in a new window.
 
Further Reading:
  Basics:
Comparison of Two Superparamagnetic Viral-Sized Iron Oxide Particles Ferumoxides and Ferumoxtran-10 with a Gadolinium Chelate in Imaging Intracranial Tumors
2002   by www.ajnr.org    
  News & More:
Optimized Labelling of Human Monocytes with Iron Oxide MR Contrast Agents
Sunday, 30 November 2003   by rsna2003.rsna.org    
10 SUMMARY AND FUTURE PERSPECTIVES
   by dissertations.ub.rug.nl    
MRI Resources 
Safety pool - Developers - Non-English - Case Studies - Services and Supplies - Manufacturers
 
Unidentified Bright ObjectInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
(UBO) Subcortical 'bright objects' are commonly displayed on high field MR of the brain. These subcortical high signal intensity foci have been verified to be caused by tangential cross-sectional images of gyri and sulci.
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Further Reading:
  Basics:
Image Characteristics and Quality
   by www.sprawls.org    
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News  (5)  Resources  (1)  Forum  (4)  
 
Variable Flip Angle
 
The temporal variation of the flip angle (from one RF pulse to the next) to enhance SNR, and/or equalize the signal intensity for each phase encoding step.
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• View the DATABASE results for 'Variable Flip Angle' (4).Open this link in a new window


• View the NEWS results for 'Variable Flip Angle' (1).Open this link in a new window.
 
Further Reading:
  Basics:
A practical guideline for T1 reconstruction from various flip angles in MRI
Saturday, 1 October 2016   by journals.sagepub.com    
Searchterm 'Signal Intensity' was also found in the following service: 
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Radiology  (1) Open this link in a new window
Voxel
 
A voxel is a volume element (volumetric and pixel) representing a value in the three dimensional space, corresponding to a pixel for a given slice thickness. Voxels are frequently used in the visualization and analysis of medical data. The Magnetic Resonance Imaging MRI pixel intensity is proportional to the signal intensity of the appropriate voxel.
See also Volumetric Imaging.
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• View the DATABASE results for 'Voxel' (35).Open this link in a new window

 
Further Reading:
  Basics:
Magnetic Resonance Imaging, History & Introduction
2000   by www.cis.rit.edu    
Voxel-based structural magnetic resonance imaging (MRI) study of patients with early onset schizophrenia
Monday, 22 December 2008   by 7thspace.com    
  News & More:
Quantity, not just quality, in new Stanford brain scan method
Monday, 4 November 2013   by news.stanford.edu    
MRI Resources 
Online Books - Research Labs - Liver Imaging - Examinations - Breast MRI - Pathology
 
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