公开(公告)号：US12019134B2

公开(公告)日：2024-06-25

申请号：US17617955

申请日：2020-06-19

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Ulrich Katscher ,  Johan Samuel Van Den Brink ,  Jochen Keupp

IPC分类号： G01R33/561 ,  A61B5/00 ,  A61B5/0536 ,  G01R33/56 ,  G01R33/563

CPC分类号： G01R33/5613 ,  A61B5/004 ,  A61B5/0536 ,  G01R33/5607 ,  G01R33/5608 ,  G01R33/5615 ,  G01R33/56341

摘要： A method of magnet resonance (MR) imaging of an object includes MR signal acquisition in a single scan providing information for electric properties imaging (EPT), which may include a phase map as well as tissue boundaries. The method includes: subjecting the object to a multi echo steady state imaging sequence or a fast spectroscopic imaging sequence that includes RF pulses and switched magnetic field gradients, wherein two or more echo signals are generated after each RF excitation; acquiring the echo signals; deriving a magnitude image and a phase map from the acquired echo signals, which phase map represents the spatial RF field distribution induced by the RF pulses in the object; and reconstructing an electric conductivity map from the magnitude image and from the phase map, wherein tissue boundaries are derived from at least the magnitude image.

公开(公告)号：US12011254B2

公开(公告)日：2024-06-18

申请号：US16951074

申请日：2020-11-18

申请人： The Brigham and Women's Hospital, Inc.

发明人： Junichi Tokuda ,  Qun Wang ,  Kemal Tuncali ,  Ravi Teja Seethamraju ,  Clare M. Tempany ,  Ehud J. Schmidt

IPC分类号： A61B5/055 ,  A61B5/00 ,  A61B5/06 ,  A61B90/00 ,  G01R33/50 ,  G01R33/561

CPC分类号： A61B5/055 ,  A61B5/06 ,  A61B5/746 ,  A61B90/37 ,  G01R33/50 ,  G01R33/5615

摘要： The present disclosure is directed to systems and methods for generating images using short tau inversion recovery, ultrashort echo time (STIR-UTE) MRI sequences. The STIR-UTE MRI sequences can be used to generate images that can differentiate between regions that are at temperatures that are either lethal or non-lethal to cell life. Thus, these sequences can be beneficial for implementations such as in monitoring cryoablation procedures.

公开(公告)号：US20240077563A1

公开(公告)日：2024-03-07

申请号：US18307964

申请日：2023-04-27

申请人： THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS

发明人： Xiaohong Joe ZHOU ,  Guangyu DAN ,  Kaibao SUN

IPC分类号： G01R33/563 ,  G01R33/50 ,  G01R33/561

CPC分类号： G01R33/56341 ,  G01R33/50 ,  G01R33/5615 ,  G01R33/56366

摘要： Magnetic resonance imaging systems and methods are provided for time-efficiently producing a plurality of image contrasts, the plurality of image contrasts including a first contrast being coupled with a second contrast and acquired over a plurality of key parameters that govern the second contrast to which the first contrast is coupled. In addition, the plurality of image contrasts is used to simultaneously map the first contrast, the second contrast, and additional contrasts.

公开(公告)号：US11899085B2

公开(公告)日：2024-02-13

申请号：US16823274

申请日：2020-03-18

申请人： SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.

发明人： Yu Ding ,  Yuan Zheng ,  Qi Liu ,  Jian Xu

IPC分类号： G01R33/48 ,  G01R33/56 ,  G06T11/00 ,  G01R33/561 ,  G01R33/565 ,  G01R33/483 ,  G01R33/36 ,  A61B5/055 ,  G01R33/563

CPC分类号： G01R33/4818 ,  G01R33/3607 ,  G01R33/4835 ,  G01R33/565 ,  G01R33/5608 ,  G01R33/5611 ,  G01R33/5614 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/5617 ,  G01R33/5618 ,  G01R33/5659 ,  G06T11/003 ,  G06T11/005 ,  G06T11/008 ,  A61B5/055 ,  G01R33/561 ,  G01R33/56316 ,  G01R33/56341 ,  G06T2207/10076 ,  G06T2207/10084 ,  G06T2207/10088 ,  G06T2207/10104 ,  G06T2207/10116 ,  G06T2207/10124 ,  G06T2210/41 ,  G06T2211/408

摘要： A system for MRI is provided. The system may obtain a plurality of sets of under-sampled k-space data corresponding to a plurality of frames. Each set of under-sampled k-space data may be acquired simultaneously from a plurality of slice locations of a subject in one of the frames using an MRI scanner. The system may reconstruct a plurality of reference slice images based on the sets of under-sampled k-space data of the plurality of frames. Each of the reference slice images may be representative of one of the slice locations in more than one frame of the frames. The system may further reconstruct a plurality of image series based on the sets of under-sampled k-space data and the reference slice images. Each image series may correspond to one of the slice locations and include a plurality of slice images of the corresponding slice location in the plurality of frames.

公开(公告)号：US20180372829A1

公开(公告)日：2018-12-27

申请号：US16064665

申请日：2016-12-15

申请人： KONINKLIJKE PHILIPS N.V.

发明人： FENG HUANG ,  ZHIGANG WU ,  ZHONGBIAO WU

IPC分类号： G01R33/563 ,  G01R33/565 ,  G06T7/20 ,  G01R33/561 ,  A61B5/055

CPC分类号： G01R33/56341 ,  A61B5/055 ,  G01R33/5615 ,  G01R33/56509 ,  G06T7/20

摘要： The invention relates to a method of MR imaging of an object (10) placed in an examination volume of a MR device (1). It is an object of the invention to enable diffusion tensor imaging (DTI) with minimization of artifacts caused by motion-induced changes of the diffusion encoding. The method of the invention comprises the steps of:—subjecting the object (10) to at least one shot of a multi-echo imaging sequence, a train of echo signals being generated by the shot, wherein the multi-echo imaging sequence comprises diffusion gradients;—acquiring the echo signals for different diffusion gradients;—detecting motion of the object (10) during acquisition of the echo signals;—determining a plurality of motional states of the object (10) based on the detected motion, wherein the object (10) is stationary in each detected motional state;—determining directions of the diffusion gradients relative to a reference frame of the object (10) for detected motional states of the object (10), respectively; and—deriving diffusion coefficients from the acquired echo signals for the determined relative directions of the diffusion gradients. Moreover, the invention relates to a MR device for carrying out this method as well as to a computer program to be run on a MR device.

公开(公告)号：US20180356488A1

公开(公告)日：2018-12-13

申请号：US16000723

申请日：2018-06-05

申请人： Siemens Healthcare GmbH

发明人： Mario Zeller

IPC分类号： G01R33/58 ,  G01R33/48 ,  G01R33/483 ,  G01R33/561

CPC分类号： G01R33/583 ,  A61B5/055 ,  A61B2560/0238 ,  G01R33/4818 ,  G01R33/4835 ,  G01R33/5611 ,  G01R33/5615

摘要： The disclosure relates to a method for calibration in a magnetic resonance (MR) imaging procedure, in which MR imaging data is acquired simultaneously from a multiplicity of slices of a subject under examination, wherein at least one subsampled calibration dataset is generated from a fully sampled reference dataset of an individual slice by rearranging an order of the data points in the reference dataset. In addition, a reconstruction dataset, which is used to assign MR imaging data to the individual slice, is calculated based on the rearranged order of the at least one calibration dataset, wherein the MR imaging data of the individual slice is subsampled in k-space.

公开(公告)号：US20180132787A1

公开(公告)日：2018-05-17

申请号：US15568593

申请日：2016-04-22

申请人： INSTITUT NATIONAL DE LA SANTE ET DE LA RECHERCHE MEDICALE (NSERM) ,  UNIVERSITÉ PARIS DIDEROT - PARIS 7 ,  ASSISTANCE PUBLIQUE - HÔPITAUX DE PARIS ,  UNIVERSITÉ DE VERSAILLES SAINT-QUENTIN-EN-YVELINES

发明人： Benjamin LEPORQ ,  Simon LAMBERT ,  Bernard VAN BEERS

IPC分类号： A61B5/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/50 ,  G01R33/56 ,  G01R33/561

CPC分类号： A61B5/4872 ,  A61B5/055 ,  A61B5/748 ,  A61B2576/00 ,  G01R33/243 ,  G01R33/4828 ,  G01R33/50 ,  G01R33/5608 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/5618

摘要： A method for post-processing images of a region of interest in a subject, the images being acquired with a magnetic resonance imaging technique, the method for post-processing comprising at least the step of: unwrapping the phase of each image, extracting a real signal over echo time for at least one pixel of the unwrapped images, and calculating fat characterization parameters by using a fitting technique applied on a model, the model being a function which associates to a plurality of parameters each extracted real signal, the plurality of parameters comprising at least two fat characterization parameters and at least one parameter obtained by a measurement, the fitting technique being a non-linear least-square fitting technique using pseudo-random initial conditions.

公开(公告)号：US20170350951A1

公开(公告)日：2017-12-07

申请号：US15172122

申请日：2016-06-02

申请人： Wisconsin Alumni Research Foundation

发明人： Alexey A. Samsonov

IPC分类号： G01R33/485 ,  G01R33/48 ,  G01R33/561 ,  G01R33/565

CPC分类号： G01R33/485 ,  G01R33/243 ,  G01R33/4828 ,  G01R33/50 ,  G01R33/5605 ,  G01R33/5614 ,  G01R33/5615 ,  G01R33/56563

摘要： A system and method is provided for producing a map of a static magnetic field (B0) of a magnetic resonance imaging system. The method includes forming a first dataset by acquiring, with the MRI system, a first plurality of different echo signals occurring at a respective plurality of different echo times. The method also includes forming a second dataset by acquiring, with the MRI system, a second plurality of different echo signals occurring at a respective plurality of different echo times. The second dataset includes signals resulting from a magnetization transfer (MT) between free water and bound molecules. The method further includes generating MT-weighted maps using the first dataset and the second dataset, determining, using the MT-weighted maps, a phase difference between the first plurality of different echo signals, and using the phase differences, generate a corrected map of the static magnetic field (B0) of the MRI system.

公开(公告)号：US20170307707A1

公开(公告)日：2017-10-26

申请号：US15517998

申请日：2015-10-13

申请人： KONINKLIJKE PHILIPS N.V.

发明人： FENG HUANG ,  ZHIGANG WU

IPC分类号： G01R33/483 ,  G01R33/561 ,  G01R33/48 ,  G01R33/563

CPC分类号： G01R33/4835 ,  A61B5/055 ,  A61B5/7207 ,  G01R33/4824 ,  G01R33/4833 ,  G01R33/5611 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/5617 ,  G01R33/56308 ,  G01R33/56341 ,  G01R33/56509

摘要： The present invention provides a magnetic resonance imaging system for imaging a subject by a multi-shot imaging. The magnetic resonance imaging system comprises an acquiring unit for acquiring MR raw data corresponding to a plurality of shots; an imaging unit for generating a plurality of folded images from the MR raw data, wherein each of the plurality of folded images is generated from a subset of the MR raw data; a deriving unit for deriving magnitude of each pixel of each folded image; a detecting unit for detecting a motion of the subject during the multi-shot imaging based on similarity measurements of any two folded images of the plurality of folded images, wherein the detecting unit further comprises a first deriving unit configured to derive the measured similarities; and a reconstructing unit for reconstructing a MR image of the subject based on MR raw data obtained according to a detection result of the detecting unit. Since the partially acquired MR raw data is used for motion detection directly, it would be more rapid and stable.

公开(公告)号：US09778337B2

公开(公告)日：2017-10-03

申请号：US13921469

申请日：2013-06-19

申请人： Dominik Paul

发明人： Dominik Paul

IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/561 ,  G01R33/48

CPC分类号： G01R33/54 ,  G01R33/4822 ,  G01R33/4826 ,  G01R33/5615 ,  G01R33/5617

摘要： In a method and magnetic resonance (MR) system to acquire MR data in a predetermined volume segment of an examination subject, the data are acquired with at least one echo train that includes at least two signal echoes. The same number of echoes is acquired for each echo train of the at least one echo train, with this number of echoes corresponding to an echo train length. The total number of echoes that are required to acquire the MR data and the echo train length is adapted so that the total number corresponds to a whole number multiple of the echo train length.