Abstract
A prototype superconducting 0.5-T/1-m bore whole-body magnetic resonance imaging (MRI) system recently completed by GA Technologies Inc. for Ishikawajima-Harima Heavy Industries (IHI) is described. The magnet system makes use of the following key features: a precision-wound, profiled, 250-A coil, which exhibits high inherent field uniformity ( approximately 100 p.p.m./50 cm DSV); superconducting shim coils, which allow uniformity without passive bore shims; a novel cold mass support system for omnidirectional 5-g support with low heat leak; two concentric heat shields, cooled by an integral Gifford-McMahon two-stage refrigerator, yielding a net helium boiloff at 0.1 L/h with no liquid-nitrogen system; mechanically retractable, thermally decoupling current leads; and low-current-drift persistent-mode operation (0.085 p.p.m./h), with an internal protection circuit.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
