US 12,105,172 B2
Magnetic resonance tomography unit and method for operating a magnetic resonance tomography unit with limited bandwidth
Georg Seegerer, Erlangen (DE); Stephan Kannengießer, Wuppertal (DE); Rainer Schneider, Erlangen (DE); Jürgen Nistler, Erlangen (DE); and Markus Vester, Nuremberg (DE)
Assigned to Siemens Healthineers AG, Forchheim (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Mar. 30, 2022, as Appl. No. 17/709,346.
Claims priority of application No. 10 2021 203 257.5 (DE), filed on Mar. 31, 2021.
Prior Publication US 2022/0317213 A1, Oct. 6, 2022
Int. Cl. G01R 33/483 (2006.01); G01R 33/36 (2006.01); G01R 33/54 (2006.01)
CPC G01R 33/483 (2013.01) [G01R 33/36 (2013.01); G01R 33/543 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for operating a magnetic resonance tomography unit, wherein the magnetic resonance tomography unit includes a magnet unit for generating a homogenous B0 magnetic field, the magnet unit comprising a magnet controller, and a control unit, wherein the magnet controller is configured to change the homogenous B0 magnetic field in a predetermined time within image acquisition of an object under examination, the method comprising:
determining a layer to be detected in the object under examination having nuclear spins that are to be excited for image acquisition;
determining, by the control unit, a value for the homogenous B0 magnetic field, in which Larmor frequencies of the nuclear spins of the layer to be detected lie in a predetermined frequency band, taking into account a magnetic field gradient predetermined for image acquisition;
setting, by the magnet controller and the magnet unit, the determined value for the homogenous B0 magnetic field and the predetermined magnetic field gradient, wherein the determined value for the homogenous B0 magnetic field is based on the Larmor frequencies of the nuclear spins of the layer to be detected lying in the predetermined frequency band; and
emitting an excitation pulse for the layer having frequencies that only lie in the predetermined frequency band, for exciting the nuclear spins in the determined layer.