公开(公告)号：US10976392B2

公开(公告)日：2021-04-13

申请号：US16277068

申请日：2019-02-15

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Hidekazu Tanaka ,  Takuma Kawai ,  Yoshitomo Sakakura ,  Motohisa Yokoi

IPC: G01R33/385 ,  H01F6/06 ,  G01R33/421

Abstract: A gradient coil according to an embodiment is configured to generate gradient magnetic fields along a plurality of axes in an imaging space in which a subject is imaged. The gradient coil includes a coil corresponding to at least one of the plurality of axes, wherein an electrically-conductive member of the coil is formed so as to be partitioned in a thickness direction by a plurality of electrically-insulative layers.

公开(公告)号：US11175360B2

公开(公告)日：2021-11-16

申请号：US16108889

申请日：2018-08-22

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Taketo Kawakami ,  Yoshitomo Sakakura ,  Hidekazu Tanaka ,  Takahiro Ishihara

IPC: G01R33/385 ,  G01R33/54

Abstract: A magnetic resonance imaging apparatus according to an embodiment is a magnetic resonance imaging apparatus including a gradient coil unit configured to generate a gradient magnetic field in an imaging space in which a subject is placed. The gradient coil unit includes a cooling layer configured to cool the gradient coil. The cooling layer includes a first cooling pipe configured to cool the gradient coil entirely and a second cooling pipe configured to locally cool the gradient coil.

公开(公告)号：US11041921B2

公开(公告)日：2021-06-22

申请号：US16693448

申请日：2019-11-25

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yoshitomo Sakakura ,  Hidekazu Tanaka

IPC: G01R33/385 ,  G01R33/565 ,  G01R33/58

Abstract: In one embodiment, an MRI apparatus includes: a scanner that is provided with at least an RF coil and a gradient coil and is configured to acquire a magnetic resonance (MR) signal emitted from an object in response to applications of an RF pulse outputted from the RF coil and a gradient magnetic field generated by the gradient coli; and processing circuitry configured to reconstruct a diagnostic image of the object based on the MR signal, generate distortion correction data for correcting a non-linear characteristic of the gradient magnetic field to a linear characteristic that is defined by gradient magnetic field strength at a correction position away from a magnetic field center of the gradient coil and distance from the magnetic field center to the correction position, and correct the diagnostic image by using the distortion correction data.

公开(公告)号：US20200174088A1

公开(公告)日：2020-06-04

申请号：US16693448

申请日：2019-11-25

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yoshitomo SAKAKURA ,  Hidekazu Tanaka

IPC: G01R33/385 ,  G01R33/58 ,  G01R33/565

Abstract: In one embodiment, an MRI apparatus includes: a scanner that is provided with at least an RF coil and a gradient coil and is configured to acquire a magnetic resonance (MR) signal emitted from an object in response to applications of an RF pulse outputted from the RF coil and a gradient magnetic field generated by the gradient coli; and processing circuitry configured to reconstruct a diagnostic image of the object based on the MR signal, generate distortion correction data for correcting a non-linear characteristic of the gradient magnetic field to a linear characteristic that is defined by gradient magnetic field strength at a correction position away from a magnetic field center of the gradient coil and distance from the magnetic field center to the correction position, and correct the diagnostic image by using the distortion correction data.