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Linear Array CoilInfoSheet: - Coils -
Intro, 
Overview, 
etc.MRI Resource Directory:
 - Coils -
 
A receiver coil with more than one segment, which can be utilized as a single or a multiple segment coil.

See also Array Coil, Receiver Coil and Switchable Coil.
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LinearityInfoSheet: - Artifacts -
Case Studies, 
Reduction Index, 
etc.
 
1) Fidelity of response, e.g. of magnetic field gradients or the RF system, to input. The output of a linear system is directly proportional to its input.
2) Spatial uniformity of the magnetic field gradient over the imaging volume. Because of eddy current effects, static and dynamic linearity have to be distinguished. Both together with the magnet homogeneity determine the geometrical correctness of the images.
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MRI Resources 
Shielding - General - Equipment - Fluorescence - Pacemaker - Mobile MRI Rental
 
Linearly Polarized CoilInfoSheet: - Coils -
Intro, 
Overview, 
etc.MRI Resource Directory:
 - Coils -
 
(LP Coil) A coil designed to excite or detect spins using one RF transmit and/or receive channel. The magnetic field has predominantly a single direction.
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LiposomesInfoSheet: - Contrast Agents - 
Intro, Overview, 
Characteristics, 
Types of, 
etc.
 
Generic name: Liposomes, central moiety: different, contrast effect: paramagnetic, distribution: different
Liposomes are lipid containing nanoparticles, or fat molecules, surrounding a water core. Liposomes were the first type of nanoparticles created to be used as carriers for lipophilic MRI contrast agents with novel characteristics.
Liposomes loaded with gadolinium-containing chelates have potential as blood pool agents, caused by modifications of the surface (e.g., with polyethylene glycol) leading to longer blood retention times.
The incorporation of contrast agents into either the the bilayer membrane or the aqueous inner cavity is possible. These MRI contrast agents has been used to image the lymph nodes using liposomes containing Gd-DTPA as well as dextran coated iron oxide particles.
To image the liver or the hepatobiliary system, liposomes containing Gd-HPDO3A, or MnDPDP, have been tested.
Liposomes containing gadolinium were conjugated to antibodies and targeted to a specific organ system.
A method of targeting tumors with ultrasound that also uses MRI to watch the cell destroying, uses liposomes loaded with cytotoxic drugs and also with gadolinium to make them show up in MRI. As well as used as an imaging technique, ultrasound can also be used to destroy cancer cells. Once the drugs have been administered, focusing the ultrasound on the target area makes blood vessels permeable. The liposomes leak out of the blood vessel into the target area, watched by MRI, where the cytotoxic drug can then go to work.

See also Memosomes, Superparamagnetic Iron Oxide, Classifications, Characteristics, etc. and Mangafodipir Trisodium.
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• View the NEWS results for 'Liposomes' (1).Open this link in a new window.

• View the DATABASE results for 'Liposomes' (6).Open this link in a new window

 
Further Reading:
  Basics:
Novel Agent for Lymph Node Imaging and Targeted Gene Therapy
1997   by cbcrp.org.127.seekdotnet.com    
DELIVERY AND ACTIVATION OF CONTRAST AGENTS FOR MAGNETIC RESONANCE IMAGING(.pdf)
   by thesis.library.caltech.edu    
New MRI Contrast Agent Under Development
Friday, 16 January 2009   by www.medgadget.com    
New Method Combines MRI, HIFU, Temperature-Sensitive Liposomes for Chemo Delivery Directly to Tumor
Wednesday, 9 February 2011   by www.medgadget.com    
  News & More:
Specialized MRI sensor can detect light deep within tissues
Thursday, 22 December 2022
Multimodal Nanoparticles for Quantitative Imaging(.pdf)
Tuesday, 13 December 2011   by alexandria.tue.nl    
Molecular Magnetic Resonance Imaging(.pdf)
2005   by www.medical.siemens.com    
Liquefier
 
System for reliquefaction of cryogenic gases; if closely matched with a superconducting magnet, zero net cryogen boil-off can be achieved.
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Further Reading:
  Basics:
Liquid Helium
   by hyperphysics.phy-astr.gsu.edu    
  News & More:
Cryogenic Liquids and their Hazards
   by www.ccohs.ca    
MRI Resources 
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