公开(公告)号：US20070096735A1

公开(公告)日：2007-05-03

申请号：US10560870

申请日：2004-06-30

申请人： Michael Morich ,  Paul Harvey ,  Zhiyong Zhai ,  Gordon DeMeester

发明人： Michael Morich ,  Paul Harvey ,  Zhiyong Zhai ,  Gordon DeMeester

IPC分类号： G01V3/00 ,  A61B5/05

CPC分类号： G01R33/28 ,  A61B5/055 ,  G01R33/288 ,  G01R33/583

摘要： An MRI apparatus is provided. The apparatus includes a main magnet for generating a main magnetic field in an examination region, a plurality of gradient coils for generating gradient fields within the main field, an RF transmit coil for transmitting RF signals into the examination region and exciting magnetic resonance in a subject disposed therein in accordance with a plurality of imaging parameters, the transmitted RF signals having a SAR associated therewith, and a SAR processor for maintaining the transmitted RF signals below a prescribed SAR level.

公开(公告)号：US20070182414A1

公开(公告)日：2007-08-09

申请号：US11569074

申请日：2005-05-11

申请人： Michael Morich ,  Gordon Demeester ,  Zhiyong Zhai ,  Paul Harvey

发明人： Michael Morich ,  Gordon Demeester ,  Zhiyong Zhai ,  Paul Harvey

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/3453

摘要： A transverse electromagnetic (TEM) coil is provided. The TEM coil includes an electrically conductive shell and an end plate disposed at a first end of the shell. The TEM coil also includes a plurality of TEM elements disposed within the shell, the plurality of TEM elements being shorter than the shell.

摘要翻译： 提供横向电磁（TEM）线圈。 TEM线圈包括导电壳体和设置在壳体的第一端处的端板。 TEM线圈还包括设置在壳体内的多个TEM元件，多个TEM元件比壳短。

公开(公告)号：US20070108976A1

公开(公告)日：2007-05-17

申请号：US10595582

申请日：2004-10-07

申请人： Michael Morich ,  Gordon DeMeester ,  Zhiyong Zhai

发明人： Michael Morich ,  Gordon DeMeester ,  Zhiyong Zhai

IPC分类号： G01V3/00 ,  A61B5/05

CPC分类号： G01R33/583 ,  G01R33/4835

摘要： Multi-slice magnetic resonance imaging of a region of interest of an imaging subject (16) is performed using a radio frequency coil (40) arranged to generate a B1 magnetic field in the region of interest. One or more processors (44, 82, 88, 110) determine a B1 field value for each slice that is representative of the B1 field over a selected area of the slice, accounting for subject effects on the BI field, and determine an adjusted per-slice radio frequency excitation for each slice that adjusts the B1 field value for the slice to a selected value. A magnetic resonance imaging system (10, 44, 46, 50, 52) acquires magnetic resonance imaging data for each slice using the adjusted per-slice radio frequency excitation for that slice. A reconstruction processor (58) reconstructs the acquired magnetic resonance imaging data into a reconstructed image representation.

摘要翻译： 使用布置成在感兴趣区域中产生B 1磁场的射频线圈（40）来执行成像对象（16）感兴趣区域的多层磁共振成像。 一个或多个处理器（44,82,88,110）确定代表在片段的选定区域上的B1字段的每个片段的B1字段值，以考虑BI字段上的对象影响，并且确定每个 对于每个切片，将切片的B SUB字段值调整为选定的值，以实现 - 射线射频激励。 磁共振成像系统（10,44,46,50,52）使用针对该切片的调节的每切片射频激励获取每个切片的磁共振成像数据。 重建处理器（58）将所获取的磁共振成像数据重建为重建图像表示。

公开(公告)号：US10254360B2

公开(公告)日：2019-04-09

申请号：US13808279

申请日：2011-07-04

申请人： Michael A. Morich ,  Zhiyong Zhai ,  Eddy Y. Wong ,  Kevin Nieman ,  Nabeel M. Malik

发明人： Michael A. Morich ,  Zhiyong Zhai ,  Eddy Y. Wong ,  Kevin Nieman ,  Nabeel M. Malik

IPC分类号： G01R33/36 ,  G01R33/3415 ,  G01R33/561

摘要： A router (60), for use with magnetic resonance systems (10), selectively routes unique excitation signals, generated by a multi-channel radio-frequency (RF) amplifier, over transmission lines (Tx) to any one of a plurality of connection panels (66) which each accepts at least one RF coil assembly having multiple coil elements (20). Each connection panel (66) includes transceiver ports (68) for connecting at least one conductor (22,24) of the coil elements (20) to a corresponding transceiver channel (T/R). The router (60) selectively routes magnetic resonance signals received by the conductors (22,24) from the transceiver channels (T/R) to a multi-channel RF receiver (41). The coin elements may carry sine-mode currents or uniform currents.

公开(公告)号：US20100026303A1

公开(公告)日：2010-02-04

申请号：US12528541

申请日：2008-01-30

申请人： Zhiyong Zhai ,  Michael A. Morich ,  Gordon D. Demeester

发明人： Zhiyong Zhai ,  Michael A. Morich ,  Gordon D. Demeester

IPC分类号： G01R33/44

CPC分类号： G01R33/3635 ,  G01R33/34007 ,  G01R33/341 ,  G01R33/3678

摘要： A radio frequency coil comprises an annular conductor or parallel annular conductors (22, 22c, 22d) configured to support: (i) a uniform electrical current distribution generating a first B1 field (B1,uniform) at a first magnetic resonance frequency directed out of a plane of the annular conductor or conductors; and (ii) a sinusoidal electrical current distribution generating a second B1 field (B1,sine) at a second magnetic resonance frequency directed parallel with the plane of the annular conductor or conductors. A magnetic resonance scanner comprises: a magnet (10) generating a static magnetic field (B0); a magnetic field gradient system (14) configured to superimpose selected magnetic field gradients on the static magnetic field; and said radio frequency coil including said annular conductor or parallel annular conductors (22, 22c, 22d).

摘要翻译： 射频线圈包括环形导体或平行环形导体（22,22c，22d），其被配置为支持：（i）均匀的电流分布，其以第一磁共振频率产生第一B1场（B1，均匀） 环形导体或导体的平面; 和（ii）以与环形导体或导体的平面平行的第二磁共振频率产生第二B1场（B1，正弦）的正弦电流分布。 磁共振扫描器包括：产生静磁场（B0）的磁体（10）; 磁场梯度系统（14），被配置为将选定的磁场梯度叠加在静磁场上; 并且所述射频线圈包括所述环形导体或平行环形导体（22,22c，22d）。

公开(公告)号：US20090201019A1

公开(公告)日：2009-08-13

申请号：US12297658

申请日：2007-04-03

申请人： Zhiyong Zhai ,  Gordon D. DeMeester ,  Michael A. Morich ,  Paul R. Harvey

发明人： Zhiyong Zhai ,  Gordon D. DeMeester ,  Michael A. Morich ,  Paul R. Harvey

IPC分类号： G01R33/34 ,  G01R33/48

CPC分类号： G01R33/34046 ,  G01R33/246 ,  G01R33/3664 ,  G01R33/3678 ,  G01R33/5659

摘要： Hybrid circuitry (40, 40′, 40″) for operatively coupling a radio frequency drive signal (70) with a quadrature coil (30) is configurable in one of at least two coil modes of a group consisting of: (i) a linear I channel mode in which an I channel input port (42) is driven without driving a Q channel input port (44); (ii) a linear Q channel mode in which the Q channel input port is driven without driving the I channel input port; (iii) a quadrature mode in which both the I and Q channel input ports are driven with a selected positive phase difference; and (iv) an anti quadrature mode in which both the I and Q channel input ports are driven with a selected negative phase difference. A temporal sequence of the at least two coil modes may be determined and employed to compensate for B inhomogeneity.

摘要翻译： 用于将射频驱动信号（70）与正交线圈（30）可操作地耦合的混合电路（40,40'，40“）可配置成以下组中的至少两个线圈模式之一：（i） 线性I通道模式，其中驱动I通道输入端口（42）而不驱动Q通道输入端口（44）; （ii）在不驱动I通道输入端口的情况下驱动Q通道输入端口的线性Q通道模式; （iii）正交模式，其中I和Q通道输入端口都以选择的正相位差驱动; 以及（iv）反正交模式，其中I和Q通道输入端口都以选定的负相位差驱动。 可以确定并采用至少两个线圈模式的时间序列来补偿B不均匀性。

公开(公告)号：US20080161675A1

公开(公告)日：2008-07-03

申请号：US11817968

申请日：2006-03-03

申请人： Paul R. Harvey ,  Eerke Holle ,  Zhiyong Zhai

发明人： Paul R. Harvey ,  Eerke Holle ,  Zhiyong Zhai

IPC分类号： A61B5/055

CPC分类号： G01R33/34046 ,  G01R33/3415

摘要： A magnetic resonance imaging system (10) utilizes an ultra-short RF body coil (36). The ultra-short body coil (36) is shorter than the mechanical equivalent birdcage coil by at least a factor of two. Such coil provides equivalent (Bt) magnetic field-uniformity, while conforming to SAR limitations.

摘要翻译： 磁共振成像系统（10）使用超短RF体线圈（36）。 超短体线圈（36）比机械等效鸟笼线圈短至少两倍。 这种线圈在符合SAR限制的情况下提供等效的（B SUB）磁场均匀性。

公开(公告)号：US09689941B2

公开(公告)日：2017-06-27

申请号：US13993689

申请日：2011-12-05

申请人： Zhiyong Zhai ,  Michael Andrew Morich ,  Paul Royston Harvey ,  Miha Fuderer

发明人： Zhiyong Zhai ,  Michael Andrew Morich ,  Paul Royston Harvey ,  Miha Fuderer

IPC分类号： G01R33/3873 ,  G01R33/24 ,  G01R33/565 ,  G01R33/54 ,  G01R33/34

CPC分类号： G01R33/3873 ,  G01R33/246 ,  G01R33/34 ,  G01R33/34076 ,  G01R33/543 ,  G01R33/5659

摘要： Coil elements (18) generate a B1 excitation field in an examination region (14), which B1 excitation field is distorted by patient loading (e.g., wavelength effects). Passive shimming elements (22, 24) are disposed between the coil elements and the subject in order to improve the B1 field uniformity. In one embodiment, passive shimming elements include one or more dielectric rods (55) disposed below the subject which generate no substantial MR proton signal and which have a permittivity of at least 100 and preferably greater than 500. In another embodiment, tubes (24) adjacent each coil element are supplied with a dielectric liquid, a thickness of the dielectric liquid between the coil element and the subject adjusting a phase of the B1 field generated by the coil element. Active B1 shimming may be combined with passive shimming elements (22, 24) to effect an improved RF field homogeneity result.

公开(公告)号：US20130278262A1

公开(公告)日：2013-10-24

申请号：US13993689

申请日：2011-12-05

申请人： Zhiyong Zhai ,  Michael Andrew Morich ,  Paul Royston Harvey ,  Miha Fuderer

发明人： Zhiyong Zhai ,  Michael Andrew Morich ,  Paul Royston Harvey ,  Miha Fuderer

IPC分类号： G01R33/3873

CPC分类号： G01R33/3873 ,  G01R33/246 ,  G01R33/34 ,  G01R33/34076 ,  G01R33/543 ,  G01R33/5659

摘要： Coil elements (18) generate a B1 excitation field in an examination region (14), which B1 excitation field is distorted by patient loading (e.g., wavelength effects). Passive shimming elements (22, 24) are disposed between the coil elements and the subject in order to improve the B1 field uniformity. In one embodiment, passive shimming elements include one or more dielectric rods (55) disposed below the subject which generate no substantial MR proton signal and which have a permittivity of at least 100 and preferably greater than 500. In another embodiment, tubes (24) adjacent each coil element are supplied with a dielectric liquid, a thickness of the dielectric liquid between the coil element and the subject adjusting a phase of the B1 field generated by the coil element. Active B1 shimming may be combined with passive shimming elements (22, 24) to effect an improved RF field homogeneity result.

摘要翻译： 线圈元件（18）在检查区域（14）中产生B1激励场，其中B1激励场由患者负载变形（例如，波长效应）。 被动调光元件（22,24）设置在线圈元件和被摄体之间，以提高B1场均匀性。 在一个实施例中，被动调光元件包括设置在对象下方的一个或多个介电棒（55），其不产生实质的MR质子信号，并且具有至少100，优选大于500的介电常数。在另一实施例中，管（24） 相邻的每个线圈元件被提供有电介质液体，线圈元件和对象之间的电介质液体的厚度调节由线圈元件产生的B1场的相位。 有源B1匀场可以与被动调光元件（22,24）组合以实现改进的RF场均匀性结果。

公开(公告)号：US20110115483A1

公开(公告)日：2011-05-19

申请号：US12742976

申请日：2008-12-12

申请人： Zhiyong Zhai ,  Robert Gauss ,  Eddy Yu Ping WONG ,  Michael A. Morich ,  Kevin M. Nieman ,  Gordon D. DeMeester

发明人： Zhiyong Zhai ,  Robert Gauss ,  Eddy Yu Ping WONG ,  Michael A. Morich ,  Kevin M. Nieman ,  Gordon D. DeMeester

IPC分类号： G01R33/44

CPC分类号： G01R33/3415 ,  G01R33/5659

摘要： A magnetic resonance coil comprises a first set of coil elements (54, 56, 80) operatively connectable with a transmit channel (66, 74) to couple with a transmit region of sensitivity for a selected load at a magnetic field strength greater than 3 Tesla, and a second set of coil elements (52, 54, 82) operatively connectable with a receive channel (66, 74) to couple with a receive region of sensitivity for the selected load at the magnetic field strength greater than 3 Tesla. The first set of coil elements is arranged proximate to but not surrounding the transmit region of sensitivity, and the second set of coil elements is arranged proximate to but not surrounding the receive region of sensitivity. The first set of coil elements and the second set of coil elements having at least one coil element (52, 56) not in common. The first and second sets of coil elements define transmit and receive regions of sensitivity for the selected load at the magnetic field strength greater than 3 Tesla that are substantially similar.

摘要翻译： 磁共振线圈包括可操作地与发射通道（66,74）连接的第一组线圈元件（54,56,80），以在大于3特斯拉的磁场强度下与选定负载的灵敏度的发射区域耦合 以及第二组线圈元件（52,54,82），其可操作地与接收通道（66,74）连接，以在大于3特斯拉的磁场强度下与所选择的负载的接收灵敏度区域耦合。 第一组线圈元件布置成靠近但不围绕灵敏度的发射区域，并且第二组线圈元件布置成接近但不包围灵敏度的接收区域。 第一组线圈元件和第二组线圈元件具有不共同的至少一个线圈元件（52,56）。 第一组和第二组线圈元件在大于3特斯拉的大于3特斯拉的磁场强度下为所选择的载荷定义灵敏度的发射和接收区域。