US 11,841,407 B2
Apparatus for magnetic resonance imaging, and methods for the design and manufacture thereof
Peter Dietz, Fürth (DE); Andreas Krug, Fürth (DE); Michael Mallett, Faringdom (GB); and Marco Bevilacqua, Oxford (GB)
Assigned to Siemens Healthcare Limited, Camberley (GB)
Appl. No. 17/636,570
Filed by Siemens Healthcare Limited, Camberley (GB)
PCT Filed Jul. 16, 2020, PCT No. PCT/EP2020/070138
§ 371(c)(1), (2) Date Feb. 18, 2022,
PCT Pub. No. WO2021/032375, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 1912001 (GB), filed on Aug. 21, 2019.
Prior Publication US 2022/0283250 A1, Sep. 8, 2022
Int. Cl. G01R 33/38 (2006.01); G01R 33/3815 (2006.01)
CPC G01R 33/3804 (2013.01) [G01R 33/3802 (2013.01); G01R 33/3815 (2013.01)] 19 Claims
OG exemplary drawing
 
1. AA device for use in magnetic resonance imaging (MRI) systems, comprising:
a superconducting main magnet coil; and
a thermal radiation shield that encloses the superconducting main magnet coil and includes an inner cylindrical bore tube, an outer cylindrical wall, and annular end walls welded between the annular cylindrical bore tube and the outer cylindrical wall to form a closed, hollow cylindrical vessel,
wherein a distribution of a position and length of welds that affix the annular end walls to the inner cylindrical bore tube comprises, in a circumferential direction of the inner cylindrical bore tube, a predetermined arrangement of welds of varying lengths, in the in the circumferential direction, interspersed with gaps of varying lengths, in the circumferential direction.