US 12,442,877 B2
Magnetic resonance imaging apparatus, image correction method, and static magnetic field inhomogeneity correction method
Naoya Sakaguchi, Chiba (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Healthcare Corporation, Chiba (JP)
Filed on Dec. 23, 2021, as Appl. No. 17/645,763.
Claims priority of application No. 2021-028972 (JP), filed on Feb. 25, 2021.
Prior Publication US 2022/0268865 A1, Aug. 25, 2022
Int. Cl. G01R 33/3875 (2006.01); G01R 33/54 (2006.01); G01R 33/565 (2006.01)
CPC G01R 33/3875 (2013.01) [G01R 33/543 (2013.01); G01R 33/56563 (2013.01); G01R 33/56572 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A magnetic resonance imaging apparatus comprising:
a transmitting unit configured to irradiate a subject placed in a static magnetic field space with high frequency pulses;
a receiving unit configured to receive an echo signal generated from the subject by irradiation with the high frequency pulses;
a gradient magnetic field generating unit configured to generate a gradient magnetic field in the static magnetic field space;
a control unit configured to control the transmitting unit, the gradient magnetic field generating unit, and the receiving unit according to a predetermined pulse sequence, for collecting echo data;
an image generating unit configured to reconstruct an image of the subject based on the echo data;
a static magnetic field inhomogeneity estimating unit configured to estimate, by calculating in advance of an imaging process based on the predetermined pulse sequence and without preliminary measurement, a static magnetic field inhomogeneity to be caused by application of the gradient magnetic field based on the predetermined pulse sequence, the static magnetic field inhomogeneity estimating unit calculating in advance of the imaging process the static magnetic field inhomogeneity using an application strength or an average application strength of a gradient magnetic field pulse determined by the predetermined pulse sequence; and
a compensation magnetic field generating unit configured to output a constant compensation magnetic field, in advance of the imaging process and without preliminary measurement, to compensate for the static magnetic field inhomogeneity.