US 11,656,308 B2
Permanent magnet assembly for magnetic resonance imaging with non-ferromagnetic frame
Cedric Hugon, Guilford, CT (US); and Michael Stephen Poole, Guilford, CT (US)
Assigned to Hyperfine Operations, Inc., Guilford, CT (US)
Filed by Hyperfine Operations, Inc., Guilford, CT (US)
Filed on Dec. 9, 2020, as Appl. No. 17/116,540.
Claims priority of provisional application 62/946,030, filed on Dec. 10, 2019.
Prior Publication US 2021/0173026 A1, Jun. 10, 2021
Int. Cl. G01R 33/3873 (2006.01); G01R 33/383 (2006.01); G01R 33/385 (2006.01); G01R 33/44 (2006.01); G01R 33/38 (2006.01)
CPC G01R 33/3873 (2013.01) [G01R 33/3802 (2013.01); G01R 33/383 (2013.01); G01R 33/3858 (2013.01); G01R 33/445 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An assembly for providing a B0 magnetic field for a magnetic resonance imaging (MRI) system, the assembly comprising:
a plurality of rods extending along a common longitudinal direction and positioned to form a bore extending along the common longitudinal direction, the plurality of rods including a first rod, the first rod comprising:
ferromagnetic segments, each having a net magnetization in a plane that is substantially perpendicular to the common longitudinal direction; and
non-ferromagnetic segments
wherein rods of the plurality of rods have different lengths and are positioned so that the assembly, when part of an MRI system, accommodates insertion of a patient's shoulder within a perimeter of the bore.