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Result : Searchterm 'Contrast Agents' found in 17 terms [] and 106 definitions []
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Searchterm 'Contrast Agents' was also found in the following services: 
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News  (49)  Resources  (7)  Forum  (8)  
 
Contrast Enhanced Magnetic Resonance AngiographyInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - MRA -
 
(CE MRA) Contrast enhanced MR angiography is based on the T1 values of blood, the surrounding tissue, and paramagnetic contrast agent.
T1-shortening contrast agents reduces the T1 value of the blood (approximately to 50 msec, shorter than that of the surrounding tissues) and allow the visualization of blood vessels, as the images are no longer dependent primarily on the inflow effect of the blood. Contrast enhanced MRA is performed with a short TR to have low signal (due to the longer T1) from the stationary tissue, short scan time to facilitate breath hold imaging, short TE to minimize T2* effects and a bolus injection of a sufficient dose of a gadolinium chelate.
Images of the region of interest are performed with 3D spoiled gradient echo pulse sequences. The enhancement is maximized by timing the contrast agent injection such that the period of maximum arterial concentration corresponds to the k-space acquisition. Different techniques are used to ensure optimal contrast of the arteries e.g., bolus timing, automatic bolus detection, bolus tracking, care bolus. A high resolution with near isotropic voxels and minimal pulsatility and misregistration artifacts should be striven for. The postprocessing with the maximum intensity projection (MIP) enables different views of the 3D data set.
Unlike conventional MRA techniques based on velocity dependent inflow or phase shift techniques, contrast enhanced MRA exploits the gadolinium induced T1-shortening effects. CE MRA reduces or eliminates most of the artifacts of time of flight angiography or phase contrast angiography. Advantages are the possibility of in plane imaging of the blood vessels, which allows to examine large parts in a short time and high resolution scans in one breath hold. CE MRA has found a wide acceptance in the clinical routine, caused by the advantages:
3D MRA can be acquired in any plane, which means that greater vessel coverage can be obtained at high resolution with fewer slices (aorta, peripheral vessels);
the possibility to perform a time resolved examination (similarly to conventional angiography);
no use of ionizing radiation; paramagnetic agents have a beneficial safety.


 
Images, Movies, Sliders:
 CE-MRA of the Carotid Arteries  Open this link in a new window
    
SlidersSliders Overview

 CE MRA of the Aorta  Open this link in a new window
    
SlidersSliders Overview

 CE-MRA of the Carotid Arteries Colored MIP  Open this link in a new window
    
SlidersSliders Overview

 
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• Related Searches:
    • MRI Scan
    • Contrast Enhanced MR Venography
    • Contrast Enhanced MRI
    • Blood Pool Agents
    • Cardiovascular Imaging
 
Further Reading:
  Basics:
Contrast-Enhanced MR Angiography(.pdf)
   by ric.uthscsa.edu    
CONTRAST ENHANCED MR ANGIOGRAPHY – PRINCIPLES, APPLICATIONS, TIPS AND PITFALLS(.pdf)
  News & More:
CONTRAST-ENHANCED MRA OF THE CAROTIDS(.pdf)
PERIPHERAL VASCULAR MAGNETIC RESONANCE ANGIOGRAPHY(.pdf)
CONTRAST ENHANCED MRI OF THE LIVER STATE-OF-THE-ART(.pdf)
Searchterm 'Contrast Agents' was also found in the following services: 
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Radiology  (46) Open this link in a new windowUltrasound  (75) Open this link in a new window
Cr-HIDAInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.MRI Resource Directory:
 - Contrast Agents -
 
Cr-HIDA (Chromium diethyl HIDA meglumine) is a substance with paramagnetic characteristics that has been tested in animals for the use as a hepatobiliary MRI contrast agent.
See also Hepatobiliary Contrast Agents, Paramagnetic Substance, Paramagnetism.

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• View the DATABASE results for 'Cr-HIDA' (2).Open this link in a new window

 
Further Reading:
  Basics:
MR-cholangiography with a double contrast technique.
Monday, 30 January 1989   by www.ncbi.nlm.nih.gov    
MRI Resources 
Quality Advice - Claustrophobia - Image Quality - MR Guided Interventions - PACS - Raman Spectroscopy
 
Crosslinked Iron OxideInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
(CLIO) This new class of contrast agents under development consists of MION reacted with crosslinking agents (e.g. epichlorohydrin used in the manufacture of dextran particles) that connect the partly free-floating dextran chain around the iron core.
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Searchterm 'Contrast Agents' was also found in the following services: 
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News  (49)  Resources  (7)  Forum  (8)  
 
Dy-DOTA-4AmCEInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.MRI Resource Directory:
 - Contrast Agents -
 
Short name: Dy-DOTA-4AmCE, central moiety: Dy2+, contrast effect: T2*enhanced
Dy-DOTA-4AmCE, a macrocyclic complex is characterized by a very slow water exchange, a complex compared with several Dy-DTPA derivatives known for their efficacy as T2 contrast agents at high magnetic fields.

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Further Reading:
  Basics:
Dysprosium
   by www.scescape.net    
Searchterm 'Contrast Agents' was also found in the following services: 
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Radiology  (46) Open this link in a new windowUltrasound  (75) Open this link in a new window
DyamideInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
Some dyamides are under preclinical development as intravascular MRI contrast agents for blood flow perfusion.
Short name: Dy-DTPA-BMA, generic name: Sprodyamide, central moiety: Dy2+, contrast effect: T2*enhanced, relaxivity: r1=3.4, r2=3.8, B0=0.47,
Short name: Dy-DTPA, central moiety: Dy2+, contrast effect: T2*enhanced,
Short name: Albumin-(Dy-DTPA)x, central moiety: Dy2+, contrast effect: T2*enhanced.


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Further Reading:
  Basics:
Dysprosium
   by www.scescape.net    
MRI Resources 
Mass Spectrometry - MRI Training Courses - Shielding - Colonography - Cardiovascular Imaging - Jobs pool
 
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