公开(公告)号：US20180149721A1

公开(公告)日：2018-05-31

申请号：US15580402

申请日：2016-06-12

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： GABRIELE MARIANNE BECK

IPC: G01R33/48 ,  G01R33/561 ,  G01R33/56 ,  G01R33/563

CPC classification number: G01R33/4826 ,  G01R33/5601 ,  G01R33/5611 ,  G01R33/56308

Abstract: The invention relates to a method of MR imaging of at least an object (10) placed in an examination volume of a MR device (1). It is an object of the invention to enable fast MR imaging using the stack-of-stars acquisition scheme with a reduced level of streaking artifacts. The method of the invention comprises: —subjecting the object (10) to an imaging sequence of at least one RF pulse and switched magnetic field gradients, —acquiring MR signals according to a stack-of-stars scheme, wherein the MR signals are acquired as radial k-space profiles (S 1-S 12) from a number of parallel slices (21-27) arranged at different positions along a slice direction, wherein the radial density of the k-space profiles (SI-SI2) varies as a function of the slice position, wherein the radial density is higher at more central k-space positions and lower at more peripheral k-space positions and wherein k-space profiles are acquired at a higher temporal density from slices at more central positions than from slices at more peripheral k-space positions, and —reconstructing a MR image from the MR signals.

公开(公告)号：US20170199258A1

公开(公告)日：2017-07-13

申请号：US15312805

申请日：2015-05-22

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： GABRIELE MARIANNE BECK ,  ALAN JERRY HUANG ,  GERRIT HENDRIK VAN IJPEREN

IPC: G01R33/48 ,  G01R33/565 ,  G01R33/561

CPC classification number: G01R33/4818 ,  G01R33/4828 ,  G01R33/50 ,  G01R33/56 ,  G01R33/5615 ,  G01R33/5616 ,  G01R33/5617 ,  G01R33/5618 ,  G01R33/56509

Abstract: The invention relates to a method of MR imaging of at least an object (10) placed in an examination volume of a MR device (1). It is an object of the invention to enable fast MR imaging using a multi-echo imaging technique which is robust with respect to motion. The method of the invention comprises the steps of:—generating echo signals by subjecting the object (10) to an imaging sequence,—acquiring the echo signals, each echo signal being attributed to a k-space line, wherein a number of k-space lines, which are adjacently arranged in a part of k-space, are repeatedly sampled, with said number of k-space lines being sampled in a different sequential order per repetition, and—reconstructing a MR image from the acquired echo signals. 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：US20200300952A1

公开(公告)日：2020-09-24

申请号：US16754771

申请日：2018-10-05

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： MARIYA IVANOVA DONEVA ,  JAN HENDRIK WULBERN ,  GABRIELE MARIANNE BECK

IPC: G01R33/567 ,  G01R33/48 ,  G01R33/561

Abstract: 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 MR imaging using a radial (or spiral) acquisition scheme with a reduced level of motion artefacts. The method of the invention comprises the following sequence of steps: —detecting a momentary motion—induced displacement (Δ) of the object (10); —attributing the detected displacement (A) to a motion state (M1-M5), each motion state (M1-M5) corresponding to one of a plurality of contiguous ranges of displacements (Δ); —determining angular coordinates of a radial or spiral k-space profile by incrementing the angular coordinates individually for each motion state (M1-M5) starting from initial angular coordinates; —acquiring the k-space profile; —repeating steps a-d a number of times; and —reconstructing an MR image from at least the k-space profiles attributed to one of the motion states (M1-M5). Moreover, the invention relates to a MR device (1) for carrying out this method as well as to a computer program to be run on a MR device (1).

公开(公告)号：US20160313429A1

公开(公告)日：2016-10-27

申请号：US15105297

申请日：2014-12-20

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： JOHAN SAMUEL VAN DEN BRINK ,  GABRIELE MARIANNE BECK

IPC: G01R33/567 ,  G01R33/48 ,  G01R33/28 ,  G01R33/565

CPC classification number: G01R33/5676 ,  G01R33/283 ,  G01R33/4818 ,  G01R33/4826 ,  G01R33/56509

Abstract: The present invention provides a method for magnetic resonance (MR) imaging of an area (144) of a subject of interest (120), comprising the steps of issuing a breath-hold command to the subject of interest (120), performing motion detection of the subject of interest (120) to detect a breath-hold condition in the area (144) of the subject of interest (120), upon detection of the breath-hold condition in the area (144) of the subject of interest (120), performing k-space (154) sampling of the area (144) of the subject of interest (120) with a given resolution, processing the k-space (154) samples covering the area (144) of the subject of interest (120) to obtain a MR image of the area (144) of the subject of interest (120). The present invention also provides a MR imaging system (110) for providing an image representation of an area (144) of a subject of interest (120) positioned in an examination space (116) of the MR imaging system (110), wherein the MR imaging system (110) is adapted to perform the method for magnetic resonance imaging according to the above method.

Abstract translation: 本发明提供一种用于感兴趣对象区域（144）的磁共振（MR）成像方法，包括以下步骤：向感兴趣对象发出呼吸保持命令（120），执行运动检测 （120）检测感兴趣对象的区域（144）中的呼吸保持状态（120）以检测感兴趣对象的区域（144）中的呼吸保持状态（120） 120），以给定的分辨率对感兴趣对象（120）的区域（144）进行k空间（154）采样，处理覆盖感兴趣对象的区域（144）的k空间（154）样本 （120）以获得感兴趣对象的区域（144）的MR图像（120）。 本发明还提供了一种用于提供位于MR成像系统（110）的检查空间（116）中的感兴趣对象（120）的区域（144）的图像表示的MR成像系统（110），其中， MR成像系统（110）适于根据上述方法执行磁共振成像方法。

公开(公告)号：US20220214416A1

公开(公告)日：2022-07-07

申请号：US17613107

申请日：2020-05-28

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： GURUPRASAD KRISHNAMOORTHY ,  GABRIELE MARIANNE BECK

IPC: G01R33/56 ,  G01R33/561 ,  G01R33/565 ,  G01R33/48

Abstract: The invention relates to a method of MR imaging of an object (10). It is an object of the invention to enable MR imaging using radial acquisition with a reduced level of phase distortions and corresponding image artefacts. The method of the invention comprises the steps of: a) generating MR signals by subjecting the object to an imaging sequence comprising RF pulses and switched magnetic field gradients; b) acquiring the MR signals as radial k-space profiles, wherein pairs of spatially adjacent k-space profiles are acquired in opposite directions and wherein k-space profiles acquired in temporal proximity are close to each other in k-space; c) reconstructing an MR image from the acquired MR signals. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

公开(公告)号：US20210109181A1

公开(公告)日：2021-04-15

申请号：US16965030

申请日：2019-01-28

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： GABRIELE MARIANNE BECK ,  JAN HENDRIK WUELBERN ,  SUTHAMBHARA NAGARAJ ,  AKSHAY BAKHRU ,  SVEN KABUS

IPC: G01R33/567 ,  G01R33/48 ,  G01R33/54 ,  G01R33/561

Abstract: The invention relates to a method of MR imaging of an object (10). It is an object of the invention to enable MR imaging using the stack-of-stars or stack-of-spirals acquisition scheme providing an enhanced image quality in the presence of motion. The method of the invention comprises the steps of:—generating MR signals by subjecting the object to an imaging sequence comprising RF pulses and switched magnetic field gradients;—acquiring signal data according to a stack-of-stars or stack-of-spirals scheme, wherein the MR signals are acquired as radial or spiral k-space profiles from a number of parallel slices arranged at adjacent positions along a slice direction, wherein a central portion (20) of k-space is more densely sampled during the acquisition than peripheral portions (21) of k-space;—reconstructing an intermediate MR image (22-25) from sub-sampled signal data for each of a number of successive time intervals;—deriving motion induced displacements and/or deformations by registering the intermediate MR images (22-25) with each other; and—combining the sub-sampled signal data and reconstructing a final MR image therefrom, wherein a motion correction is applied according to the derived motion induced displacements and/or deformations. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

公开(公告)号：US20210096202A1

公开(公告)日：2021-04-01

申请号：US16971031

申请日：2019-02-15

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： GABRIELE MARIANNE BECK ,  HOLGER EGGERS

IPC: G01R33/56 ,  G01R33/44 ,  G01R33/48 ,  G01R33/561

Abstract: The invention relates to a method of MR imaging of an object. It is an object of the invention to provide a multi-gradient echo imaging technique with increased acquisition speed and intrinsic suppression of artefacts from Bo inhomogeneities, T2* decay, chemical shift, motion, and/or flow, in particular in combination with radial or spiral k-space trajectories. The method of the invention comprises the steps of: —subjecting the object (10) to an imaging sequence comprising RF excitation pulses and switched magnetic field gradients, wherein multiple echo signals are generated at different echo times after each RF excitation pulse, —acquiring the echo signal data along radial or spiral k-space trajectories, wherefore the imaging sequence comprises magnetic field gradient blips in the x-/y- and/or z-directions; —separating signal contributions from water and fat to the echo signals and estimating a B0 map and/or an apparent transverse relaxation time map (T2* map) using a Dixon algorithm; and —synthesizing an image of a specified contrast from the echo signal data, the Bo map and/or the T2* map. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

公开(公告)号：US20160216352A1

公开(公告)日：2016-07-28

申请号：US14914899

申请日：2014-08-27

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： HOLGER EGGERS ,  GABRIELE MARIANNE BECK ,  MARIUS JOHANNES VAN MEEL ,  MICHEL PAUL JURRIAAN JURRISSEN ,  ADRIANUS JOSEPH WILLIBRORDUS DUIJNDAM

IPC: G01R33/48 ,  G01R33/56

CPC classification number: G01R33/4828 ,  G01R33/5608

Abstract: The invention provides for a magnetic resonance imaging system (300, 400) for acquiring magnetic resonance data (342) from an imaging zone (308). The magnetic resonance imaging system comprises a processor (330) for controlling the magnetic resonance imaging system. Execution of instructions cause the processor to acquire (100, 200) the magnetic resonance data using a Dixon pulse sequence (340) to control the magnetic resonance imaging system; reconstruct (102, 202) a water image (346, 504, 1424) and a fat image (344, 506, 1422) from the acquired magnetic resonance data, wherein the water image comprises a first set of complex valued voxels, wherein the fat image comprises a second set of complex valued voxels; calculate (104, 204) a modified image (348, 902, 1440, 1502, 1602, 1700, 1702, 1704, 1706, 1708) comprising a first set of real valued voxels, wherein the set of real valued voxels is calculated as follows: for each voxel, its real value is calculated by taking the n-th root of the weighted sum of the modulus of the complex value at the corresponding voxel of the first set of complex valued voxels raised to the power n and modulus of the complex value at the corresponding voxel of the second set of complex valued voxels raised to the power n, with n>1.

Abstract translation: 本发明提供一种用于从成像区域（308）获取磁共振数据（342）的磁共振成像系统（300,400）。 磁共振成像系统包括用于控制磁共振成像系统的处理器（330）。 执行指令使得处理器使用Dixon脉冲序列（340）获取（100,200）磁共振数据以控制磁共振成像系统; 从所获取的磁共振数据重建（102,202）水图像（346,504,1424）和脂肪图像（344,506,1422），其中所述水图像包括第一组复值体素，其中所述脂肪 图像包括第二组复值体素; 计算（104,204）包括第一组实值体素的修改图像（348,902,1440,1502,1600,1700,1702,1704,1706,1708），其中所述一组实值体素被计算如下 ：对于每个体素，其实际值通过将第i个复值体素的体素的复数值的模数的加权和乘以第n个复数值复合体素的幂数n和复数的模数来计算 第二组复值体素的相应体素值提高到幂n，n> 1。