公开(公告)号：US10324156B2

公开(公告)日：2019-06-18

申请号：US15654328

申请日：2017-07-19

Applicant: Synaptive Medical (Barbados) Inc.

Inventor： Chad Tyler Harris ,  Andrew Thomas Curtis ,  Jeff Alan Stainsby ,  Geron André Bindseil

IPC: G01V3/00 ,  G01R33/565 ,  G01R33/56 ,  G01R33/48

Abstract: Some implementations provide a MRI system configured to: access data encoding an input gradient waveform that would otherwise be used on a gradient sub-system of the MRI system to generate a gradient that corresponds to perturbations to the substantially uniform magnetic field; access data encoding a forward impulse response function and an inverse impulse response function, both characterizing a gradient generated from a target impulse input; pre-emphasizing the input gradient waveform by using both the forward impulse response function and the reverse impulse response function; and drive the gradient sub-system using the pre-emphasized gradient waveform such that distortions to the gradient caused by eddy currents within the gradient sub-system are substantially removed while radio-frequency (RF) samples for reconstructing an MRI image are being acquired from a grid that is substantially identical to when gradient sub-system is driven using the input gradient waveform.

公开(公告)号：US09797967B2

公开(公告)日：2017-10-24

申请号：US14899799

申请日：2015-07-15

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Geron André Bindseil ,  Chad Tyler Harris

IPC: G01V3/00 ,  G01R33/3875 ,  A61B5/055 ,  G01R33/381

CPC classification number: G01R33/3875 ,  A61B5/055 ,  G01R33/381

Abstract: Gradient coils are operated to acquire magnetic resonance (MR) signals encoding a first MRI image over a first region inside a main magnet of the MRI system in which at least a portion of a subject is placed, the first region being located within a volume of uniform magnetic field with inhomogeneity below a defined threshold. An active coil is energized to shift the volume of uniform magnetic field such that a second region inside the main magnet of the MRI system is located within the shifted volume of uniform magnetic field, at least a portion of the second region being located outside of the volume of uniform magnetic field before the volume of uniform magnetic field has been shifted. The gradient coil is operated to acquire MR signals encoding a second MRI image over the second region.

公开(公告)号：US10658109B2

公开(公告)日：2020-05-19

申请号：US15837123

申请日：2017-12-11

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Geron André Bindseil ,  Chad Tyler Harris ,  William Bradfield Handler ,  Blaine Alexander Chronik

IPC: H01F41/04 ,  G01R33/385

Abstract: A method of manufacturing electromagnet coils for use in a magnetic resonance imaging (MRI) system is provided. The method comprises forming a coil representation of a coil surface for the electromagnet coils; setting a plurality of performance metric requirements for a plurality of performance metrics for the electromagnet coils, the plurality of performance metrics including a magnetic field-shape metric and an eddy-field metric; forming a performance functional, based on the coil representation and the plurality of performance metrics, for generating a current density pattern over the coil surface; optimizing the performance functional based on the plurality of performance metric requirements; generating a current density pattern over the coil surface based on the minimized performance functional; and obtaining coil windings from the current density pattern.

公开(公告)号：US20180340992A1

公开(公告)日：2018-11-29

申请号：US15604952

申请日：2017-05-25

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Chad Tyler Harris ,  Geron André Bindseil

IPC: G01R33/34 ,  G01R33/3875 ,  G01R33/36 ,  G01R33/561 ,  G01R33/563 ,  A61B5/055

Abstract: Some implementations provide an MRI system that includes: a housing having a bore accommodating a portion of a subject; a main magnet enclosed by said housing and configured to generate a substantially uniform magnet field within the bore; a gradient sub-system to provide perturbations to the substantially uniform magnet field; a flexible coil assembly configured to (i) receive radio frequency (RF) signals from the subject in response to the portion of the subject being scanned, and (ii) generate and apply B0 shimming to improve a field homogeneity of the substantially uniform magnetic field; and a control unit configured to: drive the gradient sub-system using a gradient waveform; and receive measurement results responsive to the gradient waveform such that a coupling between the gradient sub-system and the flexible coil assembly is determined and subsequently reduced in response to the determined coupling exceeding a pre-determined threshold.

公开(公告)号：US10078121B2

公开(公告)日：2018-09-18

申请号：US15788141

申请日：2017-10-19

Applicant: Synaptive Medical (Barbados) Inc.

Inventor： Geron André Bindseil ,  Chad Tyler Harris

IPC: G01V3/00 ,  G01R33/3875 ,  G01R33/381 ,  A61B5/055

CPC classification number: G01R33/3875 ,  A61B5/055 ,  G01R33/381

Abstract: Gradient coils are operated to acquire magnetic resonance (MR) signals encoding a first MRI image over a first region inside a main magnet of the MRI system in which at least a portion of a subject is placed, the first region being located within a volume of uniform magnetic field with inhomogeneity below a defined threshold. An active coil is energized to shift the volume of uniform magnetic field such that a second region inside the main magnet of the MRI system is located within the shifted volume of uniform magnetic field, at least a portion of the second region being located outside of the volume of uniform magnetic field before the volume of uniform magnetic field has been shifted. The gradient coil is operated to acquire MR signals encoding a second MRI image over the second region.

公开(公告)号：US10539639B2

公开(公告)日：2020-01-21

申请号：US15750758

申请日：2015-08-06

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Alexander Gyles Panther ,  Geron André Bindseil ,  Chad Tyler Harris ,  Mark Tuilio Morreale

IPC: G01R33/38 ,  G01R33/421 ,  G01R33/385 ,  G01R33/30

Abstract: Some implementations provide a system that includes: a main magnet including a bore and configured to generate a substantially uniform magnetic field in the bore; one or more gradient coils configured to perturb the substantially uniform magnetic field in the bore, wherein perturbing the substantially uniform magnetic field results in a first varying magnetic field outside of the bore; and one or more shielding units located outside of the bore and configured to generate a second varying magnetic field configured to attenuate the first varying magnetic field outside of the bore.

公开(公告)号：US20180038927A1

公开(公告)日：2018-02-08

申请号：US15788141

申请日：2017-10-19

Applicant: Synaptive Medical (Barbados) Inc.

Inventor： Geron André Bindseil ,  Chad Tyler Harris

IPC: G01R33/3875 ,  G01R33/381 ,  A61B5/055

CPC classification number: G01R33/3875 ,  A61B5/055 ,  G01R33/381

Abstract: Gradient coils are operated to acquire magnetic resonance (MR) signals encoding a first MRI image over a first region inside a main magnet of the MRI system in which at least a portion of a subject is placed, the first region being located within a volume of uniform magnetic field with inhomogeneity below a defined threshold. An active coil is energized to shift the volume of uniform magnetic field such that a second region inside the main magnet of the MRI system is located within the shifted volume of uniform magnetic field, at least a portion of the second region being located outside of the volume of uniform magnetic field before the volume of uniform magnetic field has been shifted. The gradient coil is operated to acquire MR signals encoding a second MRI image over the second region.

公开(公告)号：US20170219669A1

公开(公告)日：2017-08-03

申请号：US14899799

申请日：2015-07-15

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Geron André Bindseil ,  Chad Tyler Harris

IPC: G01R33/3875 ,  G01R33/381 ,  A61B5/055

CPC classification number: G01R33/3875 ,  A61B5/055 ,  G01R33/381

Abstract: Gradient coils are operated to acquire magnetic resonance (MR) signals encoding a first MRI image over a first region inside a main magnet of the MRI system in which at least a portion of a subject is placed, the first region being located within a volume of uniform magnetic field with inhomogeneity below a defined threshold. An active coil is energized to shift the volume of uniform magnetic field such that a second region inside the main magnet of the MRI system is located within the shifted volume of uniform magnetic field, at least a portion of the second region being located outside of the volume of uniform magnetic field before the volume of uniform magnetic field has been shifted. The gradient coil is operated to acquire MR signals encoding a second MRI image over the second region.

公开(公告)号：US10921398B2

公开(公告)日：2021-02-16

申请号：US15604952

申请日：2017-05-25

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Chad Tyler Harris ,  Geron André Bindseil

IPC: A61B5/00 ,  G01R33/34 ,  G01R33/36 ,  G01R33/3875 ,  G01R33/561 ,  G01R33/563 ,  A61B5/055

Abstract: Some implementations provide an MRI system that includes: a housing having a bore accommodating a portion of a subject; a main magnet enclosed by said housing and configured to generate a substantially uniform magnet field within the bore; a gradient sub-system to provide perturbations to the substantially uniform magnet field; a flexible coil assembly configured to (i) receive radio frequency (RF) signals from the subject in response to the portion of the subject being scanned, and (ii) generate and apply B0 shimming to improve a field homogeneity of the substantially uniform magnetic field; and a control unit configured to: drive the gradient sub-system using a gradient waveform; and receive measurement results responsive to the gradient waveform such that a coupling between the gradient sub-system and the flexible coil assembly is determined and subsequently reduced in response to the determined coupling exceeding a pre-determined threshold.

公开(公告)号：US20200150205A1

公开(公告)日：2020-05-14

申请号：US16746787

申请日：2020-01-17

Applicant: SYNAPTIVE MEDICAL (BARBADOS) INC.

Inventor： Alexander Gyles Panther ,  Geron André Bindseil ,  Chad Tyler Harris ,  Mark Tuilio MORREALE

IPC: G01R33/421 ,  G01R33/30 ,  G01R33/385

Abstract: Some implementations provide a system that includes: a main magnet including a bore and configured to generate a substantially uniform magnetic field in the bore; one or more gradient coils configured to perturb the substantially uniform magnetic field in the bore, wherein perturbing the substantially uniform magnetic field results in a first varying magnetic field outside of the bore; and one or more shielding units located outside of the bore and configured to generate a second varying magnetic field configured to attenuate the first varying magnetic field outside of the bore.