公开(公告)号：US20240353510A1

公开(公告)日：2024-10-24

申请号：US18640637

申请日：2024-04-19

申请人： GE Precision Healthcare LLC

发明人： Yanan Chen ,  Haiyuan Sun ,  Gang Ma ,  Tao He ,  Sun Lu

IPC分类号： G01R33/36 ,  G01R33/385 ,  H01F27/28 ,  H02M1/00 ,  H02M7/48

CPC分类号： G01R33/3614 ,  G01R33/3852 ,  H01F27/2804 ,  H02M1/0058 ,  H02M7/4815

摘要： A resonant power circuit, a magnetic resonance imaging system, and a transformer are provided. The resonant power circuit is disposed within a scan room of a magnetic resonance imaging system, and is used for supplying power to a switch device in a radio-frequency amplifier of the magnetic resonance imaging system. The resonant power circuit includes: an inverter circuit, a resonant transformer circuit, and a rectifier circuit. The ratio of a resonant frequency is greater than 1 and less than a first threshold, a series resonant frequency being determined according to a resonant capacitor and a resonant inductor.

公开(公告)号：US12123929B2

公开(公告)日：2024-10-22

申请号：US18275934

申请日：2022-02-07

申请人： Resonance Research, Inc.

发明人： Hoby P. Hetherington ,  Kai-Ming Lo ,  William F. B. Punchard ,  Piotr M. Starewicz

IPC分类号： G01R33/3875 ,  A61B5/055 ,  G01R33/38 ,  G01R33/385

CPC分类号： G01R33/3875 ,  G01R33/3802 ,  A61B5/055 ,  G01R33/3858

摘要： The present invention provides a method for structurally designing that article of manufacture and a constructed and operational article of manufacture that will allow the inclusion of minimally coupled higher order/degree shim coils in any magnetic resonance apparatus. The novel system and methodology includes determining the shim coil terminal voltage without any prior or advance knowledge of the configuration of the electrical windings of the imaging gradient coil that is inducing that voltage.

公开(公告)号：US20240319302A1

公开(公告)日：2024-09-26

申请号：US18609486

申请日：2024-03-19

申请人： Siemens Healthineers AG

发明人： Bernd Maciejewski ,  Martin Schröder

IPC分类号： G01R33/385 ,  A61B5/055

CPC分类号： G01R33/3854 ,  A61B5/055 ,  G01R33/3858

摘要： A magnetic resonance tomography unit includes a patient tunnel and a gradient coil. A first holding structure holds the patient tunnel in an application-appropriate relative position to the magnetic resonance tomography unit, while a second holding structure holds the gradient coil. The first holding structure and the second holding structure have no vibration-transmitting mechanical coupling.

公开(公告)号：US20240319294A1

公开(公告)日：2024-09-26

申请号：US18576383

申请日：2022-07-04

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Tracy Allyn Wynn ,  Scott Bradley King ,  Alton Keel ,  Timothy Caine Ortiz ,  Arne Reykowski ,  Paul Franz Redder ,  Olli Tapio Friman ,  Rodrigo Canderon Rico

IPC分类号： G01R33/28 ,  G01R33/385

CPC分类号： G01R33/288 ,  G01R33/385

摘要： A device receives during an RF receive cycle a magnetic resonance signal (250) from an area of interest of a patient (20) which is generated in response to a RF transmit signal (350) of an MRI system (100) during an RF transmit cycle. The device includes: an RF receive coil (301); a detector (330); and a first coupling (840) device adapted to couple to an input of the detector (330) a signal (350) which is proportional to a current flowing through the RF receive coil (301) during the RF transmit cycle. The detector (330) outputs a signal (350), which indicates the magnitude and/or phase of the current flowing through the RF receive coil (301) during the RF transmit cycle. The digital signal (350) may be used to stop MR scanning, and/or to notify a system (100) operator, before harm can occur to the patient (20) due to excessive current in the RF receive coil (301) during the RF transmit cycle.

公开(公告)号：US20240310457A1

公开(公告)日：2024-09-19

申请号：US18540666

申请日：2023-12-14

申请人： ViewRay Systems, Inc.

发明人： James F. Dempsey

IPC分类号： G01R33/00 ,  A61B5/055 ,  A61N5/10 ,  G01R33/28 ,  G01R33/38 ,  G01R33/381 ,  G01R33/3815 ,  G01R33/385 ,  G01R33/48 ,  G01R33/483 ,  G01R33/563 ,  G01R33/565

CPC分类号： G01R33/0023 ,  A61B5/055 ,  A61N5/1049 ,  G01R33/0017 ,  G01R33/287 ,  G01R33/3815 ,  G01R33/385 ,  G01R33/48 ,  A61N2005/1055 ,  G01R33/3806 ,  G01R33/381 ,  G01R33/4808 ,  G01R33/4835 ,  G01R33/56325 ,  G01R33/56527 ,  G01R33/56536

摘要： Improved magnetic resonance imaging systems, methods and software are described including a low field strength main magnet, a gradient coil assembly, an RF coil system, and a control system configured for the acquisition and processing of magnetic resonance imaging data from a patient while utilizing a sparse sampling imaging technique.

公开(公告)号：US20240241203A1

公开(公告)日：2024-07-18

申请号：US18098539

申请日：2023-01-18

申请人： Wisconsin Alumni Research Foundation

发明人： Diego Hernando Arribas ,  Aidan Tollefson

IPC分类号： G01R33/56 ,  A61B5/055 ,  G01R33/385 ,  G01R33/561 ,  G01R33/563 ,  G06T11/00

CPC分类号： G01R33/5607 ,  A61B5/055 ,  G01R33/385 ,  G01R33/5615 ,  G01R33/56341 ,  G06T11/008

摘要： A system and method are provided for acquiring diffusion weighted imaging (DWI) images of a subject using a magnetic resonance imaging system includes performing a chemical-shift encoded (CSE) prescan of a subject to generate a fat image, a water image, and a B0 field map. The method also includes, for each slice or volume of a desired (DWI) acquisition from the subject, determining shim parameters that improve water signal and suppress fat signal. The method further includes performing the DWI acquisition to acquire DWI data form the subject using the shim parameters and reconstructing DWI images of the subject with suppressed artifacts induced by fat of the subject.

公开(公告)号：US20240210505A1

公开(公告)日：2024-06-27

申请号：US18200229

申请日：2023-05-22

申请人： Michael Hutchinson

发明人： Michael Hutchinson

IPC分类号： G01R33/44 ,  G01R33/36 ,  G01R33/385 ,  G01R33/483 ,  G01R33/561

CPC分类号： G01R33/445 ,  G01R33/3607 ,  G01R33/385 ,  G01R33/4835 ,  G01R33/5617 ,  G01R33/5608

摘要： An ultrafast magnetic resonance imaging (MRI) system configured to acquire MR signals from a multi-slice volume that is in a steady main magnetic field B0 along a z-direction of a Cartesian xyz coordinate system, using spatial sensitivity parameters of small receiver coils arranged in rings around the volume, using a magnetic field gradient gz along the z-direction, that can be switched on and off and a magnetic field gradient gx that is in the x-direction and that can be switched on and off. MRI signals from a slice relate to the slice position along z, and an excitation 90° pulse and a refocusing 180° pulse, signals for voxels in a y-direction column in a slice relate to position of the column in the gx field, and signals for voxels within a column relate to the xy positions of the plurality of coils.

公开(公告)号：US12019132B2

公开(公告)日：2024-06-25

申请号：US17935764

申请日：2022-09-27

申请人： CANON MEDICAL SYSTEMS CORPORATION

发明人： Masahito Nambu

IPC分类号： G01R33/56 ,  G01R33/385 ,  G06T11/00

CPC分类号： G01R33/56 ,  G01R33/385 ,  G06T11/005 ,  G06T11/006 ,  G06T11/008

摘要： A magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry is configured to acquire a first coil sensitivity map and a second coil sensitivity map for a plurality of coils, the second coil sensitivity map being different in phase from the first coil sensitivity map; generate a first image based on the first coil sensitivity map and magnetic resonance data related to the plurality of coils; generate a second image based on the first coil sensitivity map, the second coil sensitivity map, and the first image; and generate a final image from the first image and the second image.

公开(公告)号：US12019128B2

公开(公告)日：2024-06-25

申请号：US17774518

申请日：2020-11-04

申请人： Advanced Imaging Research, Inc.

发明人： Ravi Srinivasan

IPC分类号： G01R33/3815 ,  G01R33/38 ,  G01R33/385 ,  G01R33/421 ,  G01R33/422 ,  G01R33/563 ,  G01R33/58

CPC分类号： G01R33/3815 ,  G01R33/3804 ,  G01R33/3856 ,  G01R33/421 ,  G01R33/422 ,  G01R33/56341 ,  G01R33/58

摘要： An ambulance-compatible magnetic resonance imaging (MRI) system for on-site emergency diagnosis includes a mid-field super-conducting head-only magnet including a bore and an active shield arranged relative to the magnet, a passive shield arranged relative to the magnet, the passive shield including a first flange arranged adjacent to a first side of the magnet bore, a second flange arranged adjacent to a second side of the magnet bore, wherein the first flange and the second flange are electrically connected to each other, and wherein the passive shield is operative to capture flux extending out from the magnet bore and return the flux to the magnet. An asymmetric head gradient assembly for generating magnetic gradient field in the mid-field super-conducting magnet is also provided, the magnetic gradient field being between 100-150 mT/m or having a slew rate between 400-800 T/m/s. The MRI system includes a receiver coil and a controller operatively coupled to the receive coil, the controller configured to produce an image based on data obtained from the receive coil. The MRI system is mountable in an ambulance vehicle.

公开(公告)号：US11994567B2

公开(公告)日：2024-05-28

申请号：US17607092

申请日：2020-04-28

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Bernhard Gleich ,  Steffen Weiss

IPC分类号： G01R33/34 ,  G01R33/385 ,  H02K7/18

CPC分类号： G01R33/3403 ,  G01R33/385 ,  H02K7/1823

摘要： A magnetic resonance imaging antenna (114) comprising one or more coil elements (115) is disclosed. The magnetic resonance imaging antenna further comprises a radio frequency system (116) coupled to the one or more coil elements. The magnetic resonance imaging antenna further comprises a gas inlet (200) configured for receiving a pressurized gas. The magnetic resonance imaging antenna further comprises a gas outlet (202) configured for venting the pressurized gas. The magnetic resonance imaging antenna further comprises an electrical generator (117) configured for converting mechanical energy resulting from passing the pressurized gas from the gas inlet to the gas outlet into electricity while in the presence of an external magnetic field. The electrical generator is configured to power the radio frequency system using the electricity.