A high temperature superconducting imaging coil for low-field MRI

2010 ◽  
Vol 37B (2) ◽  
pp. 56-64 ◽  
Author(s):  
Hoon-Sin Cheong ◽  
James Wild ◽  
Neil Alford ◽  
Ivelin Valkov ◽  
Christopher Randell ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconducting ◽  
Low Field ◽  
Low Field Mri

Thin film high temperature superconducting RF coils for low field MRI

1994 ◽  
Vol 32 (3) ◽  
pp. 396-400 ◽  
Author(s):  
John G. van Heteren ◽  
Timothy W. James ◽  
Lincoln C. Bourne
Keyword(s):  
Thin Film ◽  
High Temperature ◽  
Rf Coils ◽  
High Temperature Superconducting ◽  
Low Field ◽  
Superconducting Rf ◽  
Low Field Mri

RF Coil for Low-Field MRI Coated with High-Temperature Superconductor

1995 ◽  
Vol 107 (2) ◽  
pp. 158-164 ◽  
Author(s):  
H. Okada ◽  
T. Hasegawa ◽  
J.G. Vanheteren ◽  
L. Kaufman
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Rf Coil ◽  
Low Field ◽  
Low Field Mri

Superconducting Wind Generators with Capacities of 10 MW and Larger

2020 ◽  
Vol 10 (10) ◽  
pp. 59-67
Author(s):  
Victor N. ANTIPOV ◽  
◽  
Andrey D. GROZOV ◽  
Anna V. IVANOVA ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Wind Power ◽  
State Of The Art ◽  
Superconducting Materials ◽  
Commercial Application ◽  
Synchronous Generators ◽  
High Temperature Superconducting ◽  
Wind Generators ◽  
Main Factor

The overall dimensions and mass of wind power units with capacities larger than 10 MW can be improved and their cost can be decreased by developing and constructing superconducting synchronous generators. The article analyzes foreign conceptual designs of superconducting synchronous generators based on different principles: with the use of high- and low-temperature superconductivity, fully superconducting or only with a superconducting excitation system, and with the use of different materials (MgB2, Bi2223, YBCO). A high cost of superconducting materials is the main factor impeding commercial application of superconducting generators. In view of the state of the art in the technology for manufacturing superconductors and their cost, a conclusion is drawn, according to which a synchronous gearless superconducting wind generator with a capacity of 10 MW with the field winding made of a high-temperature superconducting material (MgB2, Bi-2223 or YBCO) with the «ferromagnetic stator — ferromagnetic rotor» topology, with the stator diameter equal to 7—9 m, and with the number of poles equal to 32—40 has prospects for its practical use in the nearest future.

Improved Contrast in Ultra-Low-Field MRI with Time-Dependent Bipolar Prepolarizing Fields: Theory and NMR Demonstrations

2013 ◽  
Vol 20 (3) ◽  
pp. 327-336 ◽  
Author(s):  
Jaakko O. Nieminen ◽  
Jens Voigt ◽  
Stefan Hartwig ◽  
Hans Jürgen Scheer ◽  
Martin Burghoff ◽  
...  
Keyword(s):  
Field Strength ◽  
Time Course ◽  
Signal Strength ◽  
Relaxation Rates ◽  
Resonance Imaging ◽  
New Approach ◽  
Spin Lattice ◽  
Low Field ◽  
Low Field Mri ◽  
Magnetic Resonance Imaging Mri

Abstract The spin-lattice (T1) relaxation rates of materials depend on the strength of the external magnetic field in which the relaxation occurs. This T1 dispersion has been suggested to offer a means to discriminate between healthy and cancerous tissue by performing magnetic resonance imaging (MRI) at low magnetic fields. In prepolarized ultra-low-field (ULF) MRI, spin precession is detected in fields of the order of 10-100 μT. To increase the signal strength, the sample is first magnetized with a relatively strong polarizing field. Typically, the polarizing field is kept constant during the polarization period. However, in ULF MRI, the polarizing-field strength can be easily varied to produce a desired time course. This paper describes how a novel variation of the polarizing-field strength and duration can optimize the contrast between two types of tissue having different T1 relaxation dispersions. In addition, NMR experiments showing that the principle works in practice are presented. The described procedure may become a key component for a promising new approach of MRI at ultra-low fields

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