Patent ID: 9581666
Date: 2017-02-28
CPC Classifications: A61B,G01R,H01F

Claim:
1. A magnetic resonance apparatus comprising: at least one basic field electromagnet having no iron core; a basic field control unit configured to operate said at least one basic field electromagnet to generate a basic magnetic field; at least three gradient field electromagnets; a gradient field control unit configured to operate said at least three gradient field electromagnets to generate a gradient field; a radio-frequency (RF) coil; an RF control unit configured to operate said RF coil to generate an RF field; said basic field control unit, said gradient field control unit and said RF control unit being collectively configured to respectively operate said at least one basic field electromagnet, said at least three gradient field electromagnets and said RF coil to implement a magnetic resonance imaging sequence to acquire magnetic resonance data from an examination subject, said imaging sequence having a sequence duration and including a portion during which said magnetic resonance data are acquired from the examination subject, said portion having a duration that is less than said sequence duration; said at least one basic field electromagnet being situated within said at least three gradient field electromagnets, with said at least one basic field electromagnet being situated closer to the examination subject than said gradient field electromagnets during acquisition of said magnetic resonance data from the examination subject; and said basic field control unit being configured to operate said at least one basic field electromagnet in said magnetic resonance imaging sequence to generate said basic magnetic field with a higher field strength preceding said data portion of said magnetic resonance imaging sequence, to align nuclear spins in the subject, than a field strength of said basic magnetic field during said data acquisition portion.