US 12,169,230 B2
Methods and apparatus for magnetic field shimming
Cedric Hugon, Guilford, CT (US); Michael Stephen Poole, Guilford, CT (US); and Tyler S. Ralston, Clinton, CT (US)
Assigned to Hyperfine Operations, Inc., Guilford, CT (US)
Filed by Hyperfine Operations, Inc., Guilford, CT (US)
Filed on Jul. 11, 2023, as Appl. No. 18/350,598.
Application 18/350,598 is a continuation of application No. 17/696,454, filed on Mar. 16, 2022, granted, now 11,740,302.
Application 17/696,454 is a continuation of application No. 17/063,097, filed on Oct. 5, 2020, granted, now 11,294,006, issued on Apr. 5, 2022.
Application 17/063,097 is a continuation of application No. 16/746,736, filed on Jan. 17, 2020, granted, now 10,794,974, issued on Oct. 6, 2020.
Application 16/746,736 is a continuation of application No. 15/466,500, filed on Mar. 22, 2017, granted, now 10,613,168, issued on Apr. 7, 2020.
Claims priority of provisional application 62/311,821, filed on Mar. 22, 2016.
Prior Publication US 2023/0366959 A1, Nov. 16, 2023
Int. Cl. G01R 33/383 (2006.01); G01R 33/24 (2006.01); G01R 33/38 (2006.01); G01R 33/381 (2006.01); G01R 33/3873 (2006.01); G01R 33/44 (2006.01); H01F 7/02 (2006.01); H01F 7/06 (2006.01); H01F 13/00 (2006.01)
CPC G01R 33/383 (2013.01) [G01R 33/243 (2013.01); G01R 33/3806 (2013.01); G01R 33/381 (2013.01); G01R 33/3873 (2013.01); G01R 33/445 (2013.01); H01F 7/0278 (2013.01); H01F 7/064 (2013.01); H01F 13/003 (2013.01); G01R 33/3802 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of producing a magnet shim comprising a plurality of sheets stacked on top of one another, the plurality of sheets magnetized according to a magnetic pattern to modify a B0 magnetic field produced by a B0 magnet, the method comprising:
iteratively magnetizing respective sheets of the plurality of sheets to correct for a sheet field produced by one or more sheets patterned during one or more previous iterations; and
producing the magnet shim at least in part by cutting one or more portions of a material in accordance with the magnetic pattern.