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1. 发明公开

EP2972450A1 AUTOMATIC OPTIMIZATION OF PARALLEL IMAGING ACCELERATION PARAMETERS 有权转让
标题翻译：加速度参数的并行成像自动优化设计
公开(公告)号：EP2972450A1
公开(公告)日：2016-01-20
申请号：EP14715680.6
申请日：2014-03-12
申请人： Koninklijke Philips N.V. , Philips GmbH
发明人： BOERNERT, Peter , JURRISSEN, Michel Paul Jurriaan , DONEVA, Mariya Ivanova , DUIJNDAM, Adrianus Joseph Willibrordus , NEHRKE, Kay
IPC分类号： G01R33/561
CPC分类号： G01R33/5611 , G01R33/34092 , G01R33/5608
摘要： A parallel magnetic resonance imaging system (1) includes at least one radio frequency (RF) coil (10, 12) with a plurality of coil elements, a smart select unit (24), a parallel imaging parameter unit (28), and a sequence control (16). The smart select unit (24), from a pre-scan or prior scan of a subject with the at least one RF coil, constructs (60) a signal map and a plurality of noise maps based on different sets of reduction factors. The parallel imaging parameter unit (28) selects a set of reduction factors corresponding to a noise map which includes a highest signal-to-noise ratio (SNR). The sequence control (16) performs a magnetic resonance imaging scan of the subject based on the selected reduction factors.

2. 发明申请

WO2015144569A1 EPI GHOST CORRECTION INVOLVING SENSE 审中-公开
标题翻译：涉及感染的EPI GHOST校正
公开(公告)号：WO2015144569A1
公开(公告)日：2015-10-01
申请号：PCT/EP2015/055862
申请日：2015-03-20
申请人： KONINKLIJKE PHILIPS N.V.
发明人： JURRISSEN, Michel Paul Jurriaan , GROEN, Johannes Petrus , FUDERER, Miha
IPC分类号： G01R33/561 , G01R33/565
CPC分类号： G01R33/56554 , G01R33/4818 , G01R33/5611 , G01R33/5616 , G01R33/56545 , G01R33/583
摘要： In an EPI acquisition sequence for magnetic resonance signals k-space is scanned along sets of lines in k-space along opposite propagation directions, e.g. odd and even lines in k-space. Phase errors that occur due to the opposite propagation directions are corrected for in a SENSE-type parallel imaging reconstruction. The phase error distribution in image space may be initially estimated, calculated form the phase difference between images reconstructed from magnetic resonance signals acquired from the respective sets of k-space lines, or from an earlier dynamic.
摘要翻译：在用于磁共振信号的EPI采集序列中，沿相反传播方向的k空间中的线组扫描k空间。奇数和偶数行在k空间。在SENSE型并行成像重建中校正由于相反传播方向而发生的相位误差。可以初始估计图像空间中的相位误差分布，由从各组k空间线获得的磁共振信号重构的图像之间的相位差或从较早的动态计算出的相位误差分布。

3. 发明申请

WO2014141086A1 AUTOMATIC OPTIMIZATION OF PARALLEL IMAGING ACCELERATION PARAMETERS 审中-公开
标题翻译：并行成像加速度参数的自动优化
公开(公告)号：WO2014141086A1
公开(公告)日：2014-09-18
申请号：PCT/IB2014/059667
申请日：2014-03-12
申请人： KONINKLIJKE PHILIPS N.V. , PHILIPS DEUTSCHLAND GMBH
发明人： BOERNERT, Peter , JURRISSEN, Michel Paul Jurriaan , DONEVA, Mariya Ivanova , DUIJNDAM, Adrianus Joseph Willibrordus , NEHRKE, Kay
IPC分类号： G01R33/561
CPC分类号： G01R33/5611 , G01R33/34092 , G01R33/5608
摘要： A parallel magnetic resonance imaging system (1) includes at least one radio frequency (RF) coil (10, 12) with a plurality of coil elements, a smart select unit (24), a parallel imaging parameter unit (28), and a sequence control (16). The smart select unit (24), from a pre-scan or prior scan of a subject with the at least one RF coil, constructs (60) a signal map and a plurality of noise maps based on different sets of reduction factors. The parallel imaging parameter unit (28) selects a set of reduction factors corresponding to a noise map which includes a highest signal-to-noise ratio (SNR). The sequence control (16) performs a magnetic resonance imaging scan of the subject based on the selected reduction factors.
摘要翻译：平行磁共振成像系统（1）包括具有多个线圈元件的至少一个射频（RF）线圈（10,12），智能选择单元（24），并行成像参数单元（28）和序列控制（16）。智能选择单元（24）从具有至少一个RF线圈的对象的预扫描或先前扫描构造（60）基于不同的缩减因子集合的信号图和多个噪声图。并行成像参数单元（28）选择与包括最高信噪比（SNR）的噪声映射对应的一组减少因子。序列控制（16）基于所选择的缩小因子执行对象的磁共振成像扫描。

4. 发明申请

WO2015028481A1 DIXON MAGNETIC RESONANCE IMAGING 审中-公开
标题翻译： DIXON磁共振成像
公开(公告)号：WO2015028481A1
公开(公告)日：2015-03-05
申请号：PCT/EP2014/068112
申请日：2014-08-27
申请人： KONINKLIJKE PHILIPS N.V.
发明人： EGGERS, Holger , BECK, Gabriele Marianne , VAN MEEL, Marius Johannes , JURRISSEN, Michel Paul Jurriaan , DUIJNDAM, Adrianus Joseph Willibrordus
IPC分类号： G01R33/48 , G01R33/56
CPC分类号： G01R33/4828 , G01R33/5608
摘要： 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.
摘要翻译：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。

5. 发明申请

WO2014115043A1 METAL RESISTANT MR IMAGING 审中-公开
标题翻译：耐金属成像
公开(公告)号：WO2014115043A1
公开(公告)日：2014-07-31
申请号：PCT/IB2014/058069
申请日：2014-01-06
申请人： KONINKLIJKE PHILIPS N.V. , PHILIPS DEUTSCHLAND GMBH
发明人： JURRISSEN, Michel Paul Jurriaan , DEN HARDER, Johan Michiel , BLUME, Ulrike Andrea , DE WEERDT, Elwin , VAN IJPEREN, Gerrit Hendrik
IPC分类号： G01R33/44 , G01R33/565
CPC分类号： G01R33/5659 , G01R33/288 , G01R33/445 , G01R33/5611 , G01R33/5615 , G01R33/56536 , G01R33/56563
摘要： The invention relates to a method of MR imaging near metal parts using SEMAC. It is an object of the invention to provide an improved MR imaging technique that is sufficiently fast and robust against susceptibility effects. The invention proposes to apply a weaker slice-selection magnetic field gradient (G slice ) for reduction of ripple-artefacts near metal parts or to apply undersampling in the slice-selection direction of the SEMAC sequence or to apply both these aspects. According to one aspect of the invention, a sparsity constraint is used to make the reconstruction of the undersampled MR images more stable. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).
摘要翻译：本发明涉及使用SEMAC在金属部件附近进行MR成像的方法。本发明的一个目的是提供一种改进的MR成像技术，其对抗敏感性效应足够快速且鲁棒。本发明提出应用较弱的切片选择磁场梯度（Gslice）来减少金属部件附近的纹波 - 伪影，或者在SEMAC序列的切片选择方向施加欠采样或应用这两个方面。根据本发明的一个方面，使用稀疏约束来使欠采样的MR图像的重建更稳定。此外，本发明涉及MR装置（1）以及要在MR装置（1）上运行的计算机程序。

6. 发明公开

EP3123192A1 EPI GHOST CORRECTION INVOLVING SENSE 有权转让
标题翻译： EPI-GHOST-KORREKTUR MIT SENSE
公开(公告)号：EP3123192A1
公开(公告)日：2017-02-01
申请号：EP15710801.0
申请日：2015-03-20
申请人： Koninklijke Philips N.V.
发明人： JURRISSEN, Michel Paul Jurriaan , GROEN, Johannes Petrus , FUDERER, Miha
IPC分类号： G01R33/561 , G01R33/565
CPC分类号： G01R33/56554 , G01R33/4818 , G01R33/5611 , G01R33/5616 , G01R33/56545 , G01R33/583
摘要： In an EPI acquisition sequence for magnetic resonance signals k-space is scanned along sets of lines in k-space along opposite propagation directions, e.g. odd and even lines in k-space. Phase errors that occur due to the opposite propagation directions are corrected for in a SENSE-type parallel imaging reconstruction. The phase error distribution in image space may be initially estimated, calculated form the phase difference between images reconstructed from magnetic resonance signals acquired from the respective sets of k-space lines, or from an earlier dynamic.
摘要翻译：在用于磁共振信号的EPI采集序列中，沿相反传播方向的k空间中的线组扫描k空间。奇数和偶数行在k空间。在SENSE型并行成像重建中校正由于相反传播方向而发生的相位误差。可以初始估计图像空间中的相位误差分布，由从各组k空间线获得的磁共振信号重建的图像之间的相位差或从较早的动态计算出的相位误差分布。

7. 发明公开

EP3413074A1 PARALLEL MULTI-SLICE MR IMAGING 审中-公开
公开(公告)号：EP3413074A1
公开(公告)日：2018-12-12
申请号：EP17175156.3
申请日：2017-06-09
申请人： Koninklijke Philips N.V.
发明人： JURRISSEN, Michel Paul Jurriaan , NISTI GRIGOLETTO BORGONOVI, Arthur Felipe , ROZIJN, Thomas Hendrik
IPC分类号： G01R33/561 , G01R33/483 , G01R33/565
CPC分类号： G01R33/5611 , G01R33/4835 , G01R33/5616 , G01R33/56509
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). The method comprises the steps of:
- generating MR signals by subjecting the object (10) to a number N of shots of a multi-echo imaging sequence comprising multi-slice RF pulses (21) for simultaneously exciting two or more spatially separate image slices, with a phase offset in the slice direction being imparted to the MR signals, wherein the phase offset is varied from shot to shot,
- acquiring the MR signals, wherein the MR signals are received in parallel via a set of at least two RF coils (11, 12, 13) having different spatial sensitivity profiles within the examination volume, and
- reconstructing a MR image for each image slice from the acquired MR signals using a parallel reconstruction algorithm, wherein the MR signal contributions from the different image slices are separated on the basis of the spatial encodings of the MR signals according to the spatial sensitivity profiles of the RF coils (11, 12, 13) and on the basis of the phase offsets attributed to the respective image slices and shots. 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.

8. 发明公开

EP3039441A1 DIXON MAGNETIC RESONANCE IMAGING 审中-公开
标题翻译： DIXON，MAGNETRESONANZBILDGEBUNG
公开(公告)号：EP3039441A1
公开(公告)日：2016-07-06
申请号：EP14761595.9
申请日：2014-08-27
申请人： Koninklijke Philips N.V.
发明人： EGGERS, Holger , BECK, Gabriele Marianne , VAN MEEL, Marius Johannes , JURRISSEN, Michel Paul Jurriaan , DUIJNDAM, Adrianus Joseph Willibrordus
IPC分类号： G01R33/48 , G01R33/56
CPC分类号： G01R33/4828 , G01R33/5608
摘要： 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.

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