公开(公告)号：US20190187233A1

公开(公告)日：2019-06-20

申请号：US16273723

申请日：2019-02-12

申请人： CR Development AB

发明人： Daniel TOPGAARD ,  Samo Lasic ,  Markus Nilsson

IPC分类号： G01R33/563 ,  G01R33/56 ,  G01N24/08

CPC分类号： G01R33/56341 ,  G01N24/08 ,  G01N24/081 ,  G01R33/56 ,  G01R33/56308

摘要： The present invention describes a method for quantifying microscopic diffusion anisotropy and/or mean diffusivity in a material by analysis of echo attenuation curves acquired with two different gradient modulations schemes, wherein one gradient modulation scheme is based on isotropic diffusion weighting and the other gradient modulation scheme is based on non-isotropic diffusion weighting, and wherein the method comprises analyzing by comparing the signal decays of the two acquired echo attenuation curves.

公开(公告)号：US20180306884A1

公开(公告)日：2018-10-25

申请号：US15958425

申请日：2018-04-20

申请人： Mayo Foundation for Medical Education and Research

发明人： Joshua D. Trzasko ,  Eric G. Stinson ,  Stephen J. Riederer

IPC分类号： G01R33/563 ,  G01R33/56 ,  G01R33/48

CPC分类号： G01R33/56308 ,  G01R33/4824 ,  G01R33/5601 ,  G01R33/5635 ,  G01R33/56545

摘要： Accelerated dynamic magnetic resonance imaging (“MRI”) methods in which low-rank matrix completion is implemented as a pre-processing step to fill undersampled accelerated k-space while retaining both spatial and temporal resolution are described. The undersampled k-space data are acquired using multilevel sampling, in which both uniform undersampling and non-uniform undersampling are combined to achieve high temporal resolution while retaining spatial resolution.

公开(公告)号：US20180292499A1

公开(公告)日：2018-10-11

申请号：US15947443

申请日：2018-04-06

申请人： University of Virginia Patent Foundation ,  Siemens Healthcare GmbH

发明人： Craig H. Meyer ,  John P. Mugler, III ,  Samuel W. Fielden ,  Gudrun Ruyters ,  Berthold Kiefer ,  Josef Pfeuffer

IPC分类号： G01R33/561 ,  G01R33/565 ,  G01R33/48 ,  G01R33/563

CPC分类号： G01R33/5615 ,  G01R33/243 ,  G01R33/4818 ,  G01R33/4824 ,  G01R33/56308 ,  G01R33/56518 ,  G01R33/56563

摘要： In some aspects, the disclosed technology relates to magnetic field monitoring of spiral echo train imaging. In one embodiment, a method for spiral echo train imaging of an area of interest of a subject includes measuring k-space values and field dynamics corresponding to each echo of a spiral echo pulse train, using a dynamic field camera and a magnetic resonance imaging (MRI) system. The dynamic field camera is configured to measure characteristics of fields generated by the MRI system; the characteristics include at least one imperfection associated with the MRI system. The spiral echo pulse train corresponds to a spiral trajectory scan from the MRI system that obtains magnetic resonance imaging data using a pulse sequence which applies spiral gradients in-plane with through-plane phase encoding. The method also includes generating, based on the characteristics of the fields measured by the dynamic field camera and based on the obtained magnetic resonance imaging data, a model of the k-space trajectory corresponding to each echo of the spiral echo pulse train; and, based on the generated model of the k-space trajectory, reconstructing images that correspond to the area of interest and that are compensated for the at least one imperfection associated with the MRI system.

公开(公告)号：US20180256064A1

公开(公告)日：2018-09-13

申请号：US15534387

申请日：2015-12-10

申请人： ELEKTA, INC.

发明人： Martin Emile Lachaine ,  Tony Falco

IPC分类号： A61B5/055 ,  A61N5/10 ,  G01R33/48 ,  G01R33/483 ,  G01R33/56 ,  G01R33/563 ,  G01R33/567 ,  G16H30/40 ,  G06K9/46 ,  G06T11/00 ,  G06T7/00

CPC分类号： A61B5/055 ,  A61B6/5229 ,  A61N5/1037 ,  A61N5/1045 ,  A61N5/1049 ,  A61N5/1067 ,  A61N2005/1055 ,  A61N2005/1061 ,  G01R33/4824 ,  G01R33/4833 ,  G01R33/5608 ,  G01R33/56308 ,  G01R33/56325 ,  G01R33/56509 ,  G01R33/567 ,  G06K9/46 ,  G06T7/0012 ,  G06T11/005 ,  G06T2207/10088 ,  G06T2207/10116 ,  G16H30/40

摘要： Apparatus and techniques are described herein for nuclear magnetic resonance (MR) projection imaging. Such projection imaging may be used for generating four-dimensional (4D) imaging information representative of a physiologic cycle of a subject, such as including generating two or more two-dimensional (2D) images, the 2D images comprising projection images representative of different projection angles, and the 2D images generated using imaging information obtained via nuclear magnetic resonance (MR) imaging, assigning the particular 2D images to bins at least in part using information indicative of temporal positions within the physiologic cycle corresponding to the particular 2D images, constructing three-dimensional (3D) images using the binned 2D images, and constructing the 4D imaging information, comprising aggregating the 3D images.

公开(公告)号：US10018697B2

公开(公告)日：2018-07-10

申请号：US14816319

申请日：2015-08-03

申请人： Ohio State Innovation Foundation

发明人： Yu Ding ,  Orlando Simonetti

IPC分类号： G01R33/48 ,  G01R33/56 ,  G06T15/00 ,  G01R33/561 ,  G01R33/563

CPC分类号： G01R33/5608 ,  G01R33/4818 ,  G01R33/5611 ,  G01R33/56308 ,  G06T15/00

摘要： A method for improving the signal-to-noise ratio (SNR) of TGRAPPA. The SNR of the ACS lines is proportional to the condition number of the GRAPPA kernel encoding equations. Therefore, the GRAPPA kernel estimated from higher SNR ACS lines amplifies the random noise in GRAPPA reconstruction. In TGRAPPA reconstruction of dynamic image series, a widely used method to acquire ACS lines is to average-all-frame (AAF). The present disclosure utilizes a tile-all-frame (TAF) as ACS lines to improve the SNR of the reconstructed images.

公开(公告)号：US09869738B2

公开(公告)日：2018-01-16

申请号：US15368463

申请日：2016-12-02

申请人： Bruker BioSpin MRI GmbH

发明人： Arno Nauerth

IPC分类号： G01R33/56 ,  A61B5/055 ,  G01R33/563 ,  A61B90/00

CPC分类号： G01R33/5601 ,  A61B5/055 ,  A61B34/20 ,  A61B90/39 ,  A61B2090/3954 ,  A61B2576/00 ,  G01N24/08 ,  G01R33/287 ,  G01R33/385 ,  G01R33/44 ,  G01R33/56308 ,  G01R33/56509

摘要： A method for determining the position of at least one ferromagnetic particle (30) in a liquid matrix (31) with an MRI system (50). An MRI measurement sequence (MS1, MS2) is applied (20) to a measurement volume (52) in which the particle is situated. The measurement sequence includes a plurality of individual measurements (E1, E2), during each of which there is a spatially encoding gradient switching operation, including an excitation pulse (1) and signal recording (2), via the MRI system. The measurement sequence has a multiplicity of measurement blocks (MB1, MB2), which each include one or more individual measurements and, in a pause of the spatial encoding, an intermediate gradient (ZW) switched by the MRI system. The intermediate gradients are dimensioned such that, averaged over time, the particle is kept substantially in the same position (M1, M2) over each measurement block.

公开(公告)号：US20170361128A1

公开(公告)日：2017-12-21

申请号：US15534328

申请日：2015-12-10

申请人： ELEKTA, INC.

发明人： Martin Emile LACHAINE ,  Tony FALCO

IPC分类号： A61N5/10 ,  G01R33/483 ,  G01R33/56 ,  G06T7/00 ,  G06K9/46 ,  G01R33/567 ,  G01R33/563 ,  G06T11/00

CPC分类号： A61B5/055 ,  A61B6/5229 ,  A61N5/1037 ,  A61N5/1045 ,  A61N5/1049 ,  A61N5/1067 ,  A61N2005/1055 ,  A61N2005/1061 ,  G01R33/4824 ,  G01R33/4833 ,  G01R33/5608 ,  G01R33/56308 ,  G01R33/56325 ,  G01R33/56509 ,  G01R33/567 ,  G06K9/46 ,  G06T7/0012 ,  G06T11/005 ,  G06T2207/10088 ,  G06T2207/10116 ,  G16H30/40

摘要： Apparatus and techniques are described herein for nuclear magnetic resonance (MR) projection imaging. Such projection imaging may be used to control radiation therapy delivery to a subject, such as including receiving reference imaging information, generating a two-dimensional (2D) projection image using imaging information obtained via nuclear magnetic resonance (MR) imaging, the 2D projection image corresponding to a specified projection direction, the specified projection direction including a path traversing at least a portion of an imaging subject, determining a change between the generated 2D projection image and the reference imaging information, and controlling delivery of the radiation therapy at least in part using the determined change between the obtained 2D projection image and the reference imaging information.

公开(公告)号：US09693706B2

公开(公告)日：2017-07-04

申请号：US13870266

申请日：2013-04-25

申请人： Toshiba Medical Systems Corporation

发明人： Taichiro Shiodera ,  Shuhei Nitta ,  Tomoyuki Takeguchi ,  Nobuyuki Matsumoto

IPC分类号： A61B5/05 ,  A61B5/055 ,  G01R33/563 ,  G06T7/11 ,  G01R33/54

CPC分类号： A61B5/055 ,  A61B2576/026 ,  G01R33/546 ,  G01R33/56308 ,  G06T7/11 ,  G06T2207/30016

摘要： An image processing apparatus according to an embodiment includes a specifying unit and a deriving unit. The specifying unit specifies a fluid region in a plurality of magnetic resonance images that are acquired by applying a labeling pulse to a label region and that are mutually related. The deriving unit derives an index indicating dynamics of a fluid on the basis of the specified fluid region.

公开(公告)号：US20170160362A1

公开(公告)日：2017-06-08

申请号：US15368463

申请日：2016-12-02

申请人： Bruker BioSpin MRI GmbH

发明人： Arno NAUERTH

IPC分类号： G01R33/56 ,  A61B5/055 ,  A61B90/00 ,  G01R33/563

CPC分类号： G01R33/5601 ,  A61B5/055 ,  A61B34/20 ,  A61B90/39 ,  A61B2090/3954 ,  A61B2576/00 ,  G01N24/08 ,  G01R33/287 ,  G01R33/385 ,  G01R33/44 ,  G01R33/56308 ,  G01R33/56509

摘要： A method for determining the position of at least one ferromagnetic particle (30) in a liquid matrix (31) with an MRI system (50). An MRI measurement sequence (MS1, MS2) is applied (20) to a measurement volume (52) in which the particle is situated. The measurement sequence includes a plurality of individual measurements (E1, E2), during each of which there is a spatially encoding gradient switching operation, including an excitation pulse (1) and signal recording (2), via the MRI system. The measurement sequence has a multiplicity of measurement blocks (MB1, MB2), which each include one or more individual measurements and, in a pause of the spatial encoding, an intermediate gradient (ZW) switched by the MRI system. The intermediate gradients are dimensioned such that, averaged over time, the particle is kept substantially in the same position (M1, M2) over each measurement block.

公开(公告)号：US20170131376A1

公开(公告)日：2017-05-11

申请号：US14979403

申请日：2015-12-27

申请人： Toshiba Medical Systems Corporation

发明人： Mitsue Miyazaki ,  Xiangzhi Zhou ,  Aiming Lu

IPC分类号： G01R33/563 ,  G01R33/565

CPC分类号： G01R33/56308 ,  G01R33/5607 ,  G01R33/56316 ,  G01R33/56341 ,  G01R33/56366 ,  G01R33/56509

摘要： A magnetic resonance imaging apparatus according to an embodiment includes sequence control circuitry and processing circuitry. The sequence control circuitry executes a first pulse sequence and a second pulse sequence, the first pulse sequence including a first spoiler pulse serving as a dephasing gradient pulse of a first amount, the second pulse sequence including a second spoiler pulse serving as a dephasing gradient pulse of a second amount being different from the first amount or the second pulse sequence not including a spoiler pulse serving as a dephasing gradient pulse. The processing circuitry performs a subtraction operation between a first data obtained from the first pulse sequence and a second data obtained from the second pulse sequence, thereby generating an image.