公开(公告)号：EP2526437A1

公开(公告)日：2012-11-28

申请号：EP11704668.0

申请日：2011-01-13

申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： VOIGT, Tobias, Ratko ,  KATSCHER, Ulrich ,  ROZIJN, Thomas, Hendrik ,  HARVEY, Paul, Royston ,  HOMANN, Hanno, Heyke ,  FINDEKLEE, Christian ,  HANSIS, Eberhard, Sebastian

IPC分类号： G01R33/48 ,  G01R33/14 ,  A61B5/055

CPC分类号： G01R33/48 ,  A61B5/0536 ,  A61B5/055 ,  G01R33/246 ,  G01R33/443

摘要： A magnetic resonance method of electric properties tomography imaging of an object includes applying an excitation RF field to the object via a coil at a first spatial coil position (402), acquiring resulting magnetic resonance signals via a receiving channel from the object, determining from the acquired magnetic resonance signals a first phase distribution and a first amplitude of a given magnetic field component of the excitation RF field of the coil at the first coil position (402), repeating these steps with a coil at a second different spatial coil position (404), to obtain a second phase distribution, determining a phase difference between the first and second phase distribution, determining a first and a second complex permittivity of the object, the first complex permittivity comprising the first amplitude of the given magnetic field component and the second complex permittivity comprising the second amplitude of the given magnetic field component and the phase difference, equating the first complex permittivity and the second complex permittivity for receiving a final equation and determining from the final equation a phase of the given magnetic field component for the first coil position (402).

摘要翻译： 物体的电特性层析成像的磁共振方法包括通过第一空间线圈位置（402）处的线圈将激励RF场施加到对象，经由接收通道从对象获取所得到的磁共振信号，从 获取磁共振信号在第一线圈位置（402）处线圈的激励RF场的给定磁场分量的第一相位分布和第一幅度，在第二不同空间线圈位置（404）处用线圈重复这些步骤 ），以获得第二相位分布，确定第一和第二相位分布之间的相位差，确定对象的第一和第二复数介电常数，包括给定磁场分量的第一幅度和第二复数介电常数的第一复数介电常数 包括给定磁场分量的第二幅度和相位差等于的复介电常数 测量第一复介电常数和第二复介电常数以接收最终方程，并从最终方程确定用于第一线圈位置（402）的给定磁场分量的相位。

公开(公告)号：EP2483703A2

公开(公告)日：2012-08-08

申请号：EP10819710.4

申请日：2010-09-27

申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： FUDERER, Miha ,  ROZIJN, Thomas, Hendrik ,  KATSCHER, Ulrich ,  NEHRKE, Kay ,  HARVEY, Paul, Royston

IPC分类号： G01R33/561

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/5659

摘要： The invention relates to a magnetic resonance imaging apparatus comprising an array of two or more RF antennas(9) for transmitting RF pulses to and receiving MR signals from a body(7) of a patient positioned in an examination volume (2), the RF antennas (9) having spatial transmit and receive sensitivity profiles. The apparatus is arranged to: -control the temporal succession, the phase, and the amplitude of the RF feeding of each individual RF antenna (9), the phases and amplitudes being determined from the spatial transmit sensitivity profiles of the RF antennas(9), and -reconstruct a MR image from a combination of the received MR signals received via the individual RF antennas(9) and from the spatial receive sensitivity profiles of the RF antennas(9). The invention proposes that the apparatus is further arranged to: -determine the spatial transmit sensitivity profiles of the RF antennas (9) from the spatial receive sensitivity profiles of the RF antennas (9), or -determine the spatial receive sensitivity profiles of the RF antennas (9) from the spatial transmit sensitivity profiles of the RF antennas (9).

公开(公告)号：EP2269085A1

公开(公告)日：2011-01-05

申请号：EP09732227.5

申请日：2009-04-13

申请人： Koninklijke Philips Electronics N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： GRAESSLIN,Ingmar ,  BIEDERER, Sven ,  KATSCHER, Ulrich ,  SCHWESER, Ferdinand ,  BOERNERT, Peter ,  HARVEY, Paul, Royston ,  MENS, Wilhelmus, Reinerius, Maria

IPC分类号： G01R33/58

CPC分类号： G01R33/583 ,  G01R33/288 ,  G01R33/5612 ,  G01R33/5659

摘要： In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor (36) calculates the local and global SAR or even a spatial SAR map. The efficient implementation by using pre- averaged data (based on E-fields) makes a fast and accurate SAR estimation possible. By incorporating additional information as e.g. patient position the SAR calculation accuracy can be increased as well as by using more patient specific precalculated information (e.g. based on different bio meshes), the so called Q-matrices. Optionally, a sequence controller (24) creates a global SAR optimal RF pulse. After the optimal RF pulse is applied, the SAR and its spatial distribution are determined. SAR hotspots are also determined. Q-matrices within an appropriate radius around the hotspots are averaged and added to a global Q-matrix in a weighted fashion. After the global Q-matrix is updated, a new optimal RF pulse is created. One or more of the steps can be repeated to converge the SAR to a minimum.

公开(公告)号：EP2526437B1

公开(公告)日：2016-12-28

申请号：EP11704668.0

申请日：2011-01-13

申请人： Koninklijke Philips N.V. ,  Philips Intellectual Property & Standards GmbH

发明人： VOIGT, Tobias, Ratko ,  KATSCHER, Ulrich ,  ROZIJN, Thomas, Hendrik ,  HARVEY, Paul, Royston ,  HOMANN, Hanno, Heyke ,  FINDEKLEE, Christian ,  HANSIS, Eberhard, Sebastian

IPC分类号： G01R33/44 ,  A61B5/055 ,  A61B5/053 ,  G01R33/24 ,  G01R33/48

CPC分类号： G01R33/48 ,  A61B5/0536 ,  A61B5/055 ,  G01R33/246 ,  G01R33/443

摘要： A magnetic resonance method of electric properties tomography imaging of an object includes applying an excitation RF field to the object via a coil at a first spatial coil position (402), acquiring resulting magnetic resonance signals via a receiving channel from the object, determining from the acquired magnetic resonance signals a first phase distribution and a first amplitude of a given magnetic field component of the excitation RF field of the coil at the first coil position (402), repeating these steps with a coil at a second different spatial coil position (404), to obtain a second phase distribution, determining a phase difference between the first and second phase distribution, determining a first and a second complex permittivity of the object, the first complex permittivity comprising the first amplitude of the given magnetic field component and the second complex permittivity comprising the second amplitude of the given magnetic field component and the phase difference, equating the first complex permittivity and the second complex permittivity for receiving a final equation and determining from the final equation a phase of the given magnetic field component for the first coil position (402).

公开(公告)号：EP2038672A1

公开(公告)日：2009-03-25

申请号：EP07789833.6

申请日：2007-06-29

申请人： Koninklijke Philips Electronics N.V.

发明人： HARVEY, Paul, Royston

IPC分类号： G01R33/341 ,  G01R33/36

CPC分类号： G01R33/341 ,  G01R33/288 ,  G01R33/3621 ,  G01R33/3635 ,  G01R33/3642 ,  G01R33/3657 ,  G01R33/3692

摘要： A radio -frequency (RF) coil system that simplifies multi-nuclear magnetic resonance (MR) imaging is disclosed herein. The RF coil system comprises a transmitter coil (102) for transmitting an RF signal to excite a target region of a subject. The RF coil system also comprises an independent planar receiver coil assembly (110) for receiving an MR signal from at least a portion of the target region, the planar receiver coil assembly (110) being configured to include an on-board digital receiver circuit (112) for processing the received MR signal.