A cryogen-free superconducting magnet with 95 cm warm bore for whole body MRI

A 0.5 T, 95 cm warm bore, cryogen-free superconducting magnet for whole body MRI has been developed and tested. By using Nb3Sn tape superconductor, this magnet is designed to meet the same performance requirement as existing helium cooled MRI magnets. Persistent operation with drift rate less than 0...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1996-07, Vol.32 (4), p.2637-2639
Main Authors: Bu-Xin Xu, Schnurer, S., Obasih, K., Mruzek, M., Ige, O., Lochner, R., Helbing, J., Mantone, D.
Format: Article
Language:English
Subjects:
Boring
Magnetic resonance imaging
Magnetic shielding
Niobium-tin
Superconducting coils
Superconducting films
Superconducting magnets
Switches
Temperature
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Summary:A 0.5 T, 95 cm warm bore, cryogen-free superconducting magnet for whole body MRI has been developed and tested. By using Nb3Sn tape superconductor, this magnet is designed to meet the same performance requirement as existing helium cooled MRI magnets. Persistent operation with drift rate less than 0.1 ppm/hour and a stable 5.6 ppm field homogeneity in a 30 cm/spl times/40 cm cylindrical volume was achieved in October 1992. The magnet is cooled and maintained at the temperature of about 10 K by a Gifford McMahon (G-M) cryocooler. High quality images were produced by using this magnet with the 0.5 T GE SIGNA magnetic resonance imaging system.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.511415