公开(公告)号：US11353532B2

公开(公告)日：2022-06-07

申请号：US16982071

申请日：2019-03-11

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ulrich Katscher ,  Christian Findelkee ,  Jochen Keupp

IPC: G01V3/00 ,  G01R33/54 ,  G01R33/385 ,  A61B5/055

Abstract: The invention relates to a magnetic resonance imaging system (100) for determining an approximation (150) of an electric conductivity distribution within a three-dimensional anatomical structure of interest. The determining comprises acquiring a first set of (3-n)-dimensional magnetic resonance data (144), reconstructing a (3-n)-dimensional phase distribution (146) using the (3-n)-dimensional magnetic resonance data (144), calculating a (3-n)-dimensional electric conductivity distribution (148) using spatial derivatives within the (3-n) dimensions and applying to the (3-n)-dimensional electric conductivity distribution (148) a scaling factor compensating for the relative reduction of dimensions by n.

公开(公告)号：US11131736B2

公开(公告)日：2021-09-28

申请号：US16323842

申请日：2017-08-03

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Jan Jakob Meineke ,  Ulrich Katscher ,  Tim Nielsen

IPC: G01R33/561 ,  G01R33/24 ,  G01R33/44 ,  G01R33/50 ,  G01R33/56 ,  A61B5/055

Abstract: An iterative reconstruction is performed of multiple gradient echo MR imaging data to generate a reconstructed MR image (36). The iterative reconstruction uses a model (30) that links the MR imaging data and the reconstructed MR image. The model includes a parameterized magnetic field fluctuation component (32). During the performing of the iterative reconstruction, parameters of the parameterized magnetic field fluctuation component of the model are updated to optimize a cost function (40) dependent on partial derivatives of the reconstructed MR image with respect to the parameters of the parameterized magnetic field fluctuation component of the model. The image may be further processed to generate an R2* map (50), an SWI image (52), or a QSM map (54).

公开(公告)号：US10852381B2

公开(公告)日：2020-12-01

申请号：US16082983

申请日：2017-03-14

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ulrich Katscher ,  Jan Jakob Meineke

IPC: G06K9/00 ,  G01R33/563 ,  G01R33/44 ,  G06T7/70 ,  G06T7/20 ,  G06T11/00 ,  G01R33/565 ,  G01R33/24

Abstract: The invention relates to a magnetic resonance imaging system (10), the system comprising a magnetic resonance imaging device (12) for acquiring data from a moving subject (14), especially a fetus or a part of said fetus; and an image generator (30) for generating an image of said moving subject (14), wherein the magnetic resonance imaging device (12) is configured to acquire the data from the subject (14) at different positions of said subject (14) with respect to a magnetization direction B0, utilizing the movement of the subject (14); and wherein the image generator (30) is configured to —determine the position and/or orientation of said subject (14) during the respective data acquisition; —reconstruct phase images from the acquired data; and —generate a susceptibility map based on the reconstructed phase images. The invention further relates to a corresponding method for generating an image of the subject (14).

公开(公告)号：US10185011B2

公开(公告)日：2019-01-22

申请号：US15302565

申请日：2015-04-10

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Christian Stehning ,  Ulrich Katscher ,  Thomas Heiko Stehle

IPC: G01V3/00 ,  G01R33/56 ,  A61B5/055 ,  G01R33/24 ,  G01R33/44 ,  A61B5/053

Abstract: An electric properties tomography method for reconstructing a spatial distribution of electric conductivity (σ) from magnetic resonance image data representative of a magnetic resonance image of at least a portion of a subject of interest (20), the spatial distribution covering at least a portion of the area of the magnetic resonance image, and the method comprising following steps:—segmenting the magnetic resonance image,—extrapolating acquired phase values, —replacing acquired phase values by the extrapolated phase values,—transforming into the frequency domain,—multiplying a frequency domain-transformed numerical second derivative by the acquired phase values and the frequency domain-transformed numerical second derivative by the extrapolated phase values, respectively, and—transforming the result of the multiplying into the spatial domain. Also covered are a corresponding MRI system and a software module.

公开(公告)号：US20150260808A1

公开(公告)日：2015-09-17

申请号：US14434047

申请日：2013-10-01

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ulrich Katscher ,  Hanno Heyke Homann ,  Peter Boernert

IPC: G01R33/36 ,  H03F3/19

CPC classification number: G01R33/3614 ,  G01R33/4833 ,  G01R33/4836 ,  G01R33/5612 ,  G01R33/5659 ,  G01R33/583 ,  H03F3/19 ,  H03F2200/451

Abstract: The present invention relates to a magnetic resonance imaging MRI system (100) for acquiring magnetic resonance data from a target volume in a subject (101), the magnetic resonance imaging system (100) comprising: a plurality of excitation means (201) for generating a slice-/or slab-selective spatial radio frequency RF excitation magnetic field targeting slice/slab spatial variations in the target volume, and a controller (219) coupled to the plurality of excitation means (201), wherein the controller (219) is adapted for: determining a power level required by the plurality of excitation means (201) for generating the slice-/or slab-selective spatial RF excitation magnetic field, decomposing the slice-/or slab-selective spatial RF excitation magnetic field into respective RF excitation constituents of the plurality of excitation means (201), controlling each of the plurality of excitation means (201) to simultaneously generate the respective RF excitation constituent, using the determined power level for acquiring the magnetic resonance data.

Abstract translation: 本发明涉及一种用于从受检者（101）中的目标体积获取磁共振数据的磁共振成像MRI系统（100），所述磁共振成像系统（100）包括：多个激励装置（201），用于产生 目标体积中靶向切片/板空间变化的切片/或板坯选择空间射频RF激励磁场;以及耦合到多个激励装置（201）的控制器（219），其中控制器（219）是 适于：确定所述多个激励装置（201）所需的用于产生所述切片选择空间射频激励磁场的平板选择空间RF激励磁场的功率电平，将所述切片选择空间射频激励磁场分解成相应的RF 多个激励装置（201）的激励成分，使用所述确定装置控制所述多个激励装置（201）中的每一个以同时产生相应的RF激励成分 用于获取磁共振数据的ned功率电平。

公开(公告)号：US10761170B2

公开(公告)日：2020-09-01

申请号：US16062146

申请日：2016-12-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Jan Jakob Meineke ,  Ulrich Katscher

IPC: G06K9/00 ,  G01R33/56 ,  G01R33/24 ,  G01R33/565

Abstract: The invention provides for a medical imaging system (100, 400) comprising: a memory (112) for storing machine executable instructions and a processor (106) for controlling the medical imaging system. Execution of the machine executable instructions cause the processor to: receive (200) a preliminary segmentation (124) from a preliminary magnetic resonance image (122) of a region of interest (409), wherein the preliminary segmentation comprises preliminary segmentation edges; reconstruct (202) a first QSM image (124) for the region of interest from QSM magnetic resonance data (122), wherein the reconstruction of the QSM image is at least partially performed using a regularization function, wherein the regularization function is dependent upon the preliminary segmentation edges during reconstruction of the first QSM image; calculate (204) a first segmentation (126) by segmenting the first QSM image using a QSM image segmentation algorithm (134), wherein the first segmentation comprises first segmentation edges; and reconstruct (206) a second QSM image (128) for the region of interest from the QSM magnetic resonance data, wherein the reconstruction of the second QSM image is at least partially performed using the regularization function, wherein the regularization function is dependent upon the first segmentation edges.

公开(公告)号：US10330757B2

公开(公告)日：2019-06-25

申请号：US15544397

申请日：2016-01-21

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Ulrich Katscher ,  Jan Jakob Meineke ,  Holger Eggers ,  Peter Boernert

IPC: G01R33/44 ,  A61B5/055 ,  G01R33/24 ,  G01R33/48 ,  G01R33/565 ,  G01R33/56 ,  G01R33/54 ,  G01R33/28

Abstract: The invention provides for a magnetic resonance imaging system (100, 300, 100) for acquiring magnetic resonance data (110, 1104) from a subject (118) within an imaging zone (108). The magnetic resonance imaging system comprises a memory (136) for storing machine executable instructions (160, 162, 164, 166, 316) and pulse sequence data (140, 1102). The pulse sequence data comprises instructions for controlling the magnetic resonance imaging system to acquire magnetic resonance data according to a magnetic resonance imaging method. The magnetic resonance imaging system further comprises a processor (130) for controlling the magnetic resonance imaging system. Execution of the machine executable instructions causes the processor to: acquire (1200) the magnetic resonance data by controlling the magnetic resonance imaging system with the pulse sequence data; calculate (1202) a B0 inhomogeneity map (148) by analyzing the magnetic resonance data according to the magnetic resonance imaging method, calculate (1204) a B1 phase map (150) and/or a B1 amplitude map (1106) by analyzing the magnetic resonance data according to the magnetic resonance imaging method; and calculate (1206) a second derivative (1110) of the B1 phase map and/or a second derivative of the B1 magnitude map 1 and/or a second derivative of the B0 in homogeneity map in at least one predetermined direction. The second derivative is calculated using a corrected voxel size in the at least one predetermined direction, wherein the corrected voxel size is calculated using a correction factor calculated from the derivative of the B0 inhomogeneity map.

公开(公告)号：US09753111B2

公开(公告)日：2017-09-05

申请号：US14895319

申请日：2014-06-07

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Peter Forthmann ,  Sascha Krueger ,  Tim Nielsen ,  Jurgen Erwin Rahmer ,  Peter Vernickel ,  Peter Boernert ,  Ulrich Katscher

IPC: G06K9/00 ,  G01R33/54 ,  G01B11/24 ,  G01G19/44 ,  G01R33/30 ,  G06T7/00 ,  H04N5/225 ,  G06T7/73 ,  G01R33/28

CPC classification number: G01R33/543 ,  G01B11/24 ,  G01G19/44 ,  G01R33/28 ,  G01R33/307 ,  G06T7/0012 ,  G06T7/73 ,  G06T2200/04 ,  G06T2207/10088 ,  G06T2207/30196 ,  H04N5/225

Abstract: A system and method determines an isocenter for an imaging scan. The method includes receiving, by a control panel, patient data generated by at least one sensor, the patient data corresponding to dimensions of a body of a patient. The method includes generating, by the control panel, model data as a function of the patient data, the model data representing the body of the patient. The method includes receiving, by the control panel, a target location on the model data, the target location corresponding to a desired position on the body of the patient for performing the imaging scan. The method includes determining, by the control panel, an isocenter for the imaging scan as a function of the target location.

公开(公告)号：US20150051475A1

公开(公告)日：2015-02-19

申请号：US14376871

申请日：2013-01-30

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Christoph Leussler ,  Ulrich Katscher

IPC: G01R33/48 ,  G01R33/56 ,  A61B5/055 ,  A61B18/20 ,  A61N5/00 ,  A61B18/18 ,  A61F7/00 ,  G01R33/54 ,  A61N7/02

CPC classification number: G01R33/4804 ,  A61B5/055 ,  A61B18/18 ,  A61B18/1815 ,  A61B18/20 ,  A61B2018/00791 ,  A61F7/00 ,  A61N5/00 ,  A61N7/02 ,  G01R33/246 ,  G01R33/288 ,  G01R33/4808 ,  G01R33/4814 ,  G01R33/543 ,  G01R33/5608

Abstract: A medical apparatus (600, 700, 800, 900, 1000) comprising a magnetic resonance imaging system (602) comprising a magnet (604) with an imaging zone (608) for acquiring magnetic resonance data (642, 748) from a subject (618) from within the imaging zone. The medical apparatus further comprises a memory (632) for storing machine executable instructions (660, 662, 664, 760, 762, 764). The medical apparatus further comprises a processor (626) for controlling the medical apparatus. Execution of the instructions causes the processor to: acquire (100, 200, 300, 400, 506) B1 field map magnetic resonance data (642) using the magnetic resonance imaging system and determine (102, 206, 306, 408, 512) a temperature map (646) using the B1 field map magnetic resonance data.

Abstract translation: 包括磁共振成像系统（602）的医疗设备（600,700,800,900,1000），所述磁共振成像系统包括具有成像区域（608）的磁体（604），所述成像区域用于从受试者获取磁共振数据（642,748） 618）从成像区域内。 医疗设备还包括用于存储机器可执行指令（660,662,664,76,762,764）的存储器（632）。 医疗设备还包括用于控制医疗设备的处理器（626）。 执行指令使得处理器使用磁共振成像系统获取（100,200,300,400,506）B1场映射磁共振数据（642），并确定（102,206,306,408,512）a 温度图（646）使用B1场图磁共振数据。