公开(公告)号：US12061248B2

公开(公告)日：2024-08-13

申请号：US17649462

申请日：2022-01-31

Applicant: The Trustees of Columbia University in the City of New York

Inventor： Christoph Juchem ,  Michael Sebastian Theilenberg ,  Yun Shang ,  Jalal Ghazouani

IPC: G01R33/385 ,  G01R33/3875

CPC classification number: G01R33/3858 ,  G01R33/3856 ,  G01R33/3875

Abstract: An apparatus for fabricating non-planar coils includes a rotating table driven by a first motor; a wire approach height adjustment arm driven by a second motor; and a synchronization module configured such that a wire traversing from the height adjustment arm to a bobbin on the rotating table passes into a non-planar groove cut in the bobbin without damaging the wire. Performing magnetic resonance (MR) measurements includes a plurality of coil units configured for generating a gradient or shim magnetic field. The coil unit includes a plurality of coil windings, and each coil winding is separated longitudinally from an adjacent coil winding. A single pair of electrically conducting leads is configured to cause current to flow through all of the plurality of coil windings in the coil unit. Techniques include methods to fabricate and operate the apparatus.

公开(公告)号：US12055611B2

公开(公告)日：2024-08-06

申请号：US17705671

申请日：2022-03-28

Applicant: Siemens Healthcare GmbH

Inventor： Stephan Biber

IPC: G01R33/3875 ,  G01R33/3873 ,  A61B5/00 ,  A61B5/055

CPC classification number: G01R33/3875 ,  G01R33/3873 ,  A61B5/0046 ,  A61B5/055

Abstract: A magnetic resonance apparatus may include at least one sensor and a controller. The magnetic resonance apparatus is positionable in an examination room. A spatial location of the magnetic resonance apparatus in the examination room can be determined using the sensor. In a method for supporting an adjustment of a shim parameter of a magnetic resonance apparatus, a current spatial location of the magnetic resonance apparatus in an examination room is determined using the sensor, and a shim parameter of at least one shim element of the magnetic resonance apparatus is determined based on the current spatial location of the magnetic resonance apparatus and information of a magnetic field database. The magnetic field database may include information about a spatial location of the magnetic resonance apparatus and also magnetic field data correlated with the spatial location.

公开(公告)号：US20230333188A1

公开(公告)日：2023-10-19

申请号：US18138261

申请日：2023-04-24

Applicant: Hyperfine Operations, Inc.

Inventor： Todd Rearick ,  Gregory L. Charvat ,  Matthew Scot Rosen ,  Jonathan M. Rothberg

IPC: G01R33/36 ,  H01F7/06 ,  G01R33/56 ,  G01R33/28 ,  G01R33/48 ,  H01F7/02 ,  G01R33/38 ,  G01R33/565 ,  G01R33/58 ,  G01R33/383 ,  G01R33/3875 ,  G01R33/34 ,  G01R33/385 ,  G01R33/44 ,  G01R33/381 ,  G01R33/54

CPC classification number: G01R33/5608 ,  G01R33/28 ,  G01R33/34007 ,  G01R33/36 ,  G01R33/3614 ,  G01R33/38 ,  G01R33/3802 ,  G01R33/3804 ,  G01R33/3806 ,  G01R33/381 ,  G01R33/383 ,  G01R33/385 ,  G01R33/3852 ,  G01R33/3854 ,  G01R33/3856 ,  G01R33/3858 ,  G01R33/3875 ,  G01R33/445 ,  G01R33/48 ,  G01R33/543 ,  G01R33/546 ,  G01R33/56 ,  G01R33/56518 ,  G01R33/58 ,  H01F7/02 ,  H01F7/06 ,  G01R33/422

Abstract: According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate.

公开(公告)号：US20230324490A1

公开(公告)日：2023-10-12

申请号：US18036968

申请日：2021-11-19

Applicant: Resonance Research, Inc.

Inventor： Hoby P. Hetherington

IPC: G01R33/565 ,  G01R33/3875 ,  G01R33/24

CPC classification number: G01R33/56563 ,  G01R33/3875 ,  G01R33/243

Abstract: A system and method of mapping and correcting the inhomogeneity of a magnetic field within an object using an Magnetic Resonance Imaging (MRI) system where there is a single dominant resonance. The method includes acquiring at least three MRI images, each at different echo times (TE). At least two ΔTE images (ΔTEi=1 . . . N) are generated based on the at least three MRI images, wherein the subscripts I=1 N refer to images with sequentially increasing ΔTE times. Aliasing in the ΔTE1 image is permitted. The ΔTE times of ΔTE1 and ΔTE2 are set such that the alias points at which wrapping occurs in ΔTE1 does not overlap with the alias points of ΔTE2. Each ΔTE image is unwrapped. A final B0 map is set to the unwrapped ΔTEN image.

公开(公告)号：US11782099B2

公开(公告)日：2023-10-10

申请号：US16549051

申请日：2019-08-23

Applicant: Magnetic Shields Limited

Inventor： David Woolger

IPC: G01R33/00 ,  G01R33/385 ,  G01R33/3875 ,  G01R33/421 ,  G01R33/025

CPC classification number: G01R33/0076 ,  G01R33/025 ,  G01R33/385 ,  G01R33/3875 ,  G01R33/4215

Abstract: A magnetic shield apparatus for shielding magnetic field probes. The shield apparatus comprises an outer shield, and an inner shield contained within the outer shield. A magnetic field sensor is housed in the inner shield, and the outer shield and the inner shield comprise a magnetically permeable material, enclosing a volume and having at least a first end that is open.

公开(公告)号：US11747418B2

公开(公告)日：2023-09-05

申请号：US17718825

申请日：2022-04-12

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yiping Guan ,  Yoshinori Hamamura

IPC: G01R33/3875 ,  G01R33/34

CPC classification number: G01R33/3875 ,  G01R33/34046

Abstract: Some radio-frequency coils comprise three or more electrical conductors that form a radio-frequency coil element. Each of the three or more electrical conductors extends along at least a respective part of a length of the radio-frequency coil element, and, along the length of the radio-frequency coil element, the three or more electrical conductors are separated from each other by respective distances and by one or more dielectric materials.

公开(公告)号：US20230243906A1

公开(公告)日：2023-08-03

申请号：US17587697

申请日：2022-01-28

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Wayne Richard DANNELS

IPC: G01R33/3875 ,  G01R33/54

CPC classification number: G01R33/3875 ,  G01R33/543

Abstract: To achieve a uniform magnetic field in an MRI system, fitting can be performed using a partially differentiated residue phase map, differentiated shim functions, radial weights, a regularization factor, a discontinuity mask, and/or a signal intensity mask to determine coefficients for shim functions. The fitting can be performed iteratively, where the regularization factor is stronger and the radial weights focus on areas of higher confidence during earlier iterations. During later iterations, the regularization factor gradually gets weaker and the radial weights gradually focus on areas of lower confidence.

公开(公告)号：US11709214B2

公开(公告)日：2023-07-25

申请号：US17674138

申请日：2022-02-17

Applicant: BRUKER SWITZERLAND AG

Inventor： Nicolas Freytag ,  Florian Helbing ,  Roger Meister ,  Michele Zaffalon

IPC: G01R33/38 ,  G01R33/383 ,  G01R33/3875

CPC classification number: G01R33/3804 ,  G01R33/383 ,  G01R33/3875

Abstract: A temperature-control system for an NMR magnet system. A permanent magnet arrangement (1) with a central air gap (2) generates a homogeneous static magnetic field inside the air gap. A probehead (3) transmits RF pulses and receives RF signals from a test sample (0). An H0 coil changes the amplitude of the static magnetic field. A shim system (4) in the air gap further homogenizes the magnetic field. A first insulation chamber (5) surrounds and thermally shields the permanent magnet arrangement and includes an arrangement (6) controlling a temperature T1 of the first insulation chamber. The shim system, the H0 coil and the NMR probehead are arranged outside the first insulation chamber in the air gap. A heat-conducting body (7) is arranged between the shim system and the H0 coil on one side and the permanent magnet arrangement on the other, thereby enhancing field stability and suppressing drift.

公开(公告)号：US20180340995A1

公开(公告)日：2018-11-29

申请号：US15977213

申请日：2018-05-11

Applicant: Siemens Healthcare GmbH

Inventor： Mario Zeller

IPC: G01R33/483 ,  G01R33/3875 ,  G01R33/48 ,  G01R33/56 ,  G01R33/565

CPC classification number: G01R33/4835 ,  G01R33/3875 ,  G01R33/4828 ,  G01R33/543 ,  G01R33/5607 ,  G01R33/5608 ,  G01R33/56563 ,  G01R33/56572

Abstract: A method for the simultaneous recording of magnetic resonance data relating to an examination subject from at least two different slices by a magnetic resonance sequence, wherein an excitation period of the magnetic resonance sequence that includes at least one sub-section that acts on only one of the slices, and that contains at least one high frequency pulse is used, wherein, to correct the main magnetic field inhomogeneities of the first order, for each slice affected by a sub-section, a correction parameter that modifies the gradient pulses that are to be emitted is determined, taking into account at least one main magnetic field map that describes the spatial distribution of the main magnetic field and a slice position of the affected slice and is applied in the emission of gradient pulses for the respective slice in the sub-section.

公开(公告)号：US20180284206A1

公开(公告)日：2018-10-04

申请号：US15936926

申请日：2018-03-27

Applicant: JEOL Ltd.

Inventor： Hiroyasu Asano ,  Takeshi Tukada

IPC: G01R33/3875

CPC classification number: G01R33/3875 ,  G01R33/3635 ,  G01R33/389 ,  G01R33/4616

Abstract: A transmission signal generator generates a lock transmission signal that excites a lock nucleus (deuteron) used for observing a change of a static magnetic field. A LOCK transmission circuit transmits the lock transmission signal to an NMR probe. A LOCK reception circuit receives an NMR signal of the lock nucleus. A LOCK transmission sequencer, based on a pulse sequence generated according to at least one of amplitude modulation, frequency modulation, or phase modulation, controls generation of the lock transmission signal performed by the transmission signal generator.