US 11,656,307 B2
Acoustic shield for a magnetic resonance imaging magnet assembly
Thomas Erik Amthor, Hamburg (DE); and Peter Forthmann, Hamburg (DE)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Appl. No. 17/598,331
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Mar. 20, 2020, PCT No. PCT/EP2020/057731
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/193389, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 19165915 (EP), filed on Mar. 28, 2019.
Prior Publication US 2022/0179021 A1, Jun. 9, 2022
Int. Cl. G01R 33/385 (2006.01); G01R 33/3815 (2006.01)
CPC G01R 33/3854 (2013.01) [G01R 33/3815 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A magnetic resonance imaging system component, the magnetic resonance imaging system component comprises:
an acoustic shield for a magnetic resonance imaging cylindrical magnet assembly, wherein the acoustic shield includes a cylindrical portion configured for being inserted into a bore of the magnetic resonance imaging cylindrical magnet assembly and for completely covering the bore of the magnetic resonance imaging system, wherein the cylindrical portion includes a smooth exposed surface configured for facing away from the magnetic resonance imaging cylindrical magnet assembly, wherein the cylindrical portion further comprises an attachment surface, wherein the acoustic shield further comprises an acoustic metamaterial layer attached to the attachment surface wherein the magnetic resonance imaging system component further comprises the magnetic resonance imaging cylindrical magnet assembly, wherein the magnetic resonance imaging system component comprises an air gap between the acoustic metamaterial layer and the magnetic resonance imaging cylindrical magnet assembly, and wherein the magnetic resonance imaging system component further comprises an air pressure control system configured for controlling an air pressure of the air gap to adjust a frequency dependency of acoustic absorption by the acoustic shield.