US 11,815,575 B2
Magnetic resonance imaging device, computer-implemented method for operating a magnetic resonance imaging device, computer program and electronically readable storage medium
Stefan Popescu, Erlangen (DE)
Assigned to Siemens Healthcare GmbH, Erlangen (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Feb. 7, 2022, as Appl. No. 17/665,854.
Claims priority of application No. 21155850 (EP), filed on Feb. 8, 2021.
Prior Publication US 2022/0252685 A1, Aug. 11, 2022
Int. Cl. G01R 33/385 (2006.01); A61B 5/055 (2006.01); G01R 33/24 (2006.01); G01R 33/58 (2006.01)
CPC G01R 33/385 (2013.01) [A61B 5/055 (2013.01); G01R 33/24 (2013.01); G01R 33/58 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A magnetic resonance imaging (MRI) device, comprising:
a main field unit configured to establish a main magnetic field in an imaging region;
a gradient coil assembly configured to generate a gradient field in the imaging region;
a radio frequency (RF) arrangement configured to send excitation signals to and receive magnetic resonance signals from the imaging region;
a field camera configured to determine magnetic field information in the imaging region, the field camera including multiple magnetic field sensors arranged at predefined measurement positions enclosing the imaging region, the field camera being a vector field camera configured to acquire vector-valued sensor data describing the magnetic field at each of the measurement positions three-dimensionally, wherein the vector field camera comprises:
for magnetometers measuring optically detected magnetic resonance spectra, optical signal lines for each magnetic field sensor, and/or
for the magnetic field sensors, a power transmission device configured to work at a frequency of at least 1 GHz and/or not being a harmonic of the Larmor frequency of the magnetic resonance imaging device, and/or using dielectric waveguides as power transmission lines; and
a controller configured to:
receive sensor data for each of the predefined measurement positions,
calculate the magnetic field information for the imaging region based on the sensor data to determine the magnetic field information to three dimensionally describe the magnetic field in the imaging region, and
implement at least one calibration measure and/or correction measure based on the magnetic field information.