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Result : Searchterm 'Flow' found in 15 terms [] and 98 definitions []
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Double Inversion Recovery T1 MeasurementInfoSheet: - Sequences - 
Intro, 
Overview, 
Types of, 
etc.MRI Resource Directory:
 - Sequences -
 
(DIR or DIRT1) Double inversion recovery T1 measurement is a T1 weighted black blood MRA sequence in which the signal from blood is suppressed. The inversion time to suppress blood is described as the duration between the initial inversion pulse and time point that the longitudinal magnetization of blood reaches the zero point. The readout starts at the blood suppression inversion time (BSP TI) and blood in the imaging slice gives no signal. This inversion time is around 650 ms with a 60 beat per minute heart rate at 1.5 T.
The TI can be decreased by using a wider receive bandwidth, shorter echo train length and/or narrow trigger window. Wide bandwidth also decreases the blurring caused by long echo trains at the expense of signal to noise ratio. In case of in plane or slow flow the suppression of the signal from blood may be incomplete. With increased TE or change of the image plane the blood suppression can be improved.
Double inversion recovery is a breath hold technique with one image per acquisition used in cardiovascular imaging. The patient is instructed to hold the breath in expiration (if not possible also inspiration can be taken), so that the end diastolic volume in the cardiac chambers would be the same during entire scanning. DIR provides fine details of the boundary between the lumen and the wall of the cardiac chambers and main vascular and heart structures, pericardium, and mediastinal tissues.
 
Images, Movies, Sliders:
 Normal Dual Inversion Fast Spin-echo  Open this link in a new window
      

Courtesy of  Robert R. Edelman

 
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• Related Searches:
    • Cardiac MRI
    • Dual Echo Sequence
    • Black Blood MRA
    • Inversion Recovery
    • Saturation Pulses
 
Further Reading:
  News & More:
Artificial double inversion recovery images can substitute conventionally acquired images: an MRI-histology study
Wednesday, 16 February 2022   by www.nature.com    
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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:
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Dysprosium
   by www.scescape.net    
MRI Resources 
Shielding - - Implant and Prosthesis - Absorption and Emission - Implant and Prosthesis pool - Jobs pool
 
Electromagnet
 
A type of magnet that utilizes coils of wire, typically wound on an iron core, so that as current flows through the coil it becomes magnetized. The direction of the magnetic field is parallel to the long axis of the coil. Whole body electromagnets, used in medical imaging (also called resistive) are limited to their field strength, because the weight becomes prohibitively large at high field MRI. The magnetic field shuts down, if the current is switched of. Because this type of magnet generates heat, a good cooling system is essential.
For a stronger magnetic field, the wires must be manufactured of superconducting materials to reduce the power needed to produce the field.

See also Resistive Magnet, Superconducting Magnet and Uprightâ„¢ MRI
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• View the NEWS results for 'Electromagnet' (8).Open this link in a new window.
 
Further Reading:
  Basics:
What types of magnets are there?
   by my.execpc.com    
  News & More:
'Electromagnetic Wormhole' Possible with Invisibility Technology
Monday, 15 October 2007   by www.brightsurf.com    
Superconductors Face the Future
Wednesday, 15 September 2010   by www.nanotech-now.com    
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Even Echo Rephasing
 
A rephasing or refocusing, which occurs when constant velocity spins return to the same starting phase they had directly after the initial exciting RF pulse, as a result of the application of an even number of gradient pulses. This may also result from the application of multiple gradient echo pulses following the RF pulse. The even echo rephasing phenomenon is one of the flow effects observed in MR imaging.
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Further Reading:
  Basics:
Motion Compensation in MR Imaging
   by ccn.ucla.edu    
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FerrioxamineInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
Ferrioxamines are potential iron oxide-based intravascular contrast agents. Ferrioxamine methanesulfonate, ferrioxamine-B, and hydroxyethyl-starch-ferrioxamine have been tested as MRI contrast agents, partly in clinical trials.
Ferrioxamine methanesulfonate was tested as a paramagnetic agent for the imaging of the kidney and the urogenital system. Hydroxyethyl-starch-ferrioxamine has the potential to provide information regarding myocardial vascular flow and ferrioxamine-B derivatives may be used as hepatobiliary contrast agents.

See also Superparamagnetic Iron Oxide, Hepatobiliary Contrast Agents.
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MRI Resources 
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