公开(公告)号：US06552538B2

公开(公告)日：2003-04-22

申请号：US09833003

申请日：2001-04-11

申请人： Gordon D. DeMeester ,  Michael Burl ,  Michael A. Morich

发明人： Gordon D. DeMeester ,  Michael Burl ,  Michael A. Morich

IPC分类号： G01V300

CPC分类号： G01R33/583

摘要： A pair of quadrature radio frequency coils (32, 34) disposed adjacent an imaging region (10) are typically loaded differently due to factors such as subject geometry, subject mass, and a relative distance from the subject. A tip angle adjustment circuit (50) monitors a combined tip angle adjacent a mid-plane of the examination region, such as by analyzing delivered and reflected power to each of the coils. An adjustment circuit (54) adjusts relative RF power or amplitude to produce a selected, combined tip angle in the examination region.

公开(公告)号：US06211677B1

公开(公告)日：2001-04-03

申请号：US09075117

申请日：1998-05-08

申请人： Michael Burl ,  Michael A. Morich

发明人： Michael Burl ,  Michael A. Morich

IPC分类号： G01V300

CPC分类号： G01R33/3635 ,  G01R33/34084 ,  G01R33/36

摘要： In a magnetic resonance imaging apparatus, a whole-body RF coil (42) disposed circumferentially around an examination region (14) is tuned to a first Larmor frequency, e.g., that of hydrogen. A first transmitter (44) transmits RF signals at the first Larmor frequency. A first T/R switch (40) electronically switches the whole-body RF coil (42) between a transmit mode in which it is electronically connected to the first transmitter (44) for exciting resonance in hydrogen nuclei, and a receive mode in which it is electronically connected to a first receiver channel for demodulating magnetic resonance signals received from resonating hydrogen nuclei. An insertable lung coil (70) is positioned inside the whole-body RF coil (42) around the examination region. The lung coil (70) is tuned, while the whole-body RF coil (42) is enabled, to a second Larmor frequency corresponding to a non-hydrogen nuclei such that the tuning compensates for reactance from the whole-body RF coil that is inductively coupled to the lung coil. A second T/R switch (80) electronically switches the lung coil (70) between a second transmitter (82) for exciting resonance in non-hydrogen nuclei, and a second receiver channel.

摘要翻译： 在磁共振成像装置中，围绕检查区域（14）周向设置的全身RF线圈（42）被调谐到第一拉莫尔频率，例如氢的频率。 第一发射机（44）以第一拉莫尔频率发射RF信号。 第一T / R开关（40）在其电子连接到第一发射器（44）的发射模式之间电子地切换全身RF线圈（42），用于激发氢核中的谐振，以及接收模式，其中 它被电连接到第一接收器通道，用于解调从谐振氢核接收的磁共振信号。 可插入的肺线圈（70）位于检查区域周围的全身RF线圈（42）的内部。 在全身RF线圈（42）被启用的同时，将肺线圈（70）调谐到对应于非氢核的第二拉莫尔频率，使得调谐补偿来自全身RF线圈的电抗 感应耦合到肺线圈。 第二T / R开关（80）在第二发射器（82）之间电子地切换肺线圈（70），用于激发非氢核中的谐振和第二接收器通道。

公开(公告)号：US06169401A

公开(公告)日：2001-01-02

申请号：US09200168

申请日：1998-11-25

申请人： Hiroyuki Fujita ,  Michael Burl ,  Michael A. Morich

发明人： Hiroyuki Fujita ,  Michael Burl ,  Michael A. Morich

IPC分类号： G01V300

CPC分类号： G01R33/3678

摘要： A magnetic imaging apparatus generates a main magnetic field longitudinally through an image region and excites magnetic resonance in selected nuclei in a patient or subject disposed in the image area. The resonating nuclei generate radio frequency magnetic resonance signals which are received by a quadrature highpass ladder surface coil (D). The highpass ladder coil includes a central leg 34 having a capacitive element Cv disposed symmetrically about a midpoint 44. A like number of additional legs 30, 32, 36, 38 are disposed parallel to and symmetrically on opposite side of the central leg. Side elements 40, 42 include capacitive elements CA which interconnect adjacent ends of each of the legs. The capacitive elements are disposed symmetrically about the midpoint 44 and are selected such that the coil supports at least two intrinsic resonant modes including an odd mode 50 and an even mode 52. The even mode is sensitive to fields in the plane of the coil and the odd mode is sensitive to fields in a plane orthogonal to the coil.

摘要翻译： 磁性成像装置通过图像区域纵向地产生主磁场，并且在设置在图像区域中的患者或对象中的选定细胞核中激发磁共振。 谐振核产生由正交高通梯面线圈（D）接收的射频磁共振信号。 高通梯形线圈包括具有围绕中点44对称设置的电容元件Cv的中心支腿34.相似数量的附加支脚30,32,36,38平行于对称地设置在中心支线的相对侧上。 侧面元件40,42包括互连每个腿的相邻端部的电容元件CA。 电容元件围绕中点44对称地设置，并且被选择为使得线圈支持包括奇数模式50和偶模式52的至少两个本征谐振模式。偶模对线圈的平面中的场敏感，并且 奇数模式对垂直于线圈的平面中的场敏感。

公开(公告)号：US10114086B2

公开(公告)日：2018-10-30

申请号：US12195637

申请日：2008-08-21

申请人： Daniel Gagnon ,  Michael A. Morich ,  Douglas M. Blakeley ,  Robert L. Zahn ,  Kevin M. Nieman

发明人： Daniel Gagnon ,  Michael A. Morich ,  Douglas M. Blakeley ,  Robert L. Zahn ,  Kevin M. Nieman

IPC分类号： A61B5/05 ,  A61B6/00 ,  G01R33/28 ,  G01R33/3875 ,  G01R33/421 ,  G01R33/422 ,  G01R33/48

摘要： A hybrid imaging system includes a magnetic resonance scanner and a second modality imaging system disposed in the same radio frequency isolation space. The second modality imaging system includes radiation detectors configured to detect at least one of high energy particles and high energy photons. In some embodiments a retractable radio frequency screen is selectively extendible into a gap between the magnetic resonance scanner and the second modality imaging system. In some embodiments shim coils are disposed with the magnetic resonance scanner and are configured to compensate for distortion of the static magnetic field of the magnetic resonance scanner produced by proximity of the second modality imaging system.

公开(公告)号：US08441259B2

公开(公告)日：2013-05-14

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： G01V3/00

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。

公开(公告)号：US20130106416A1

公开(公告)日：2013-05-02

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

CPC分类号： G01R33/3642 ,  G01R33/3415 ,  G01R33/3607 ,  G01R33/3621 ,  G01R33/3678 ,  G01R33/5612

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.

摘要翻译： 与磁共振系统（10）一起使用的路由器（60）选择性地将由多通道射频（RF）放大器产生的唯一激励信号通过传输线（Tx）路由到多个连接中的任何一个 每个接收至少一个具有多个线圈元件（20）的RF线圈组件的面板（66）。 每个连接面板（66）包括用于将线圈元件（20）的至少一个导体（22,24）连接到对应的收发器通道（T / R）的收发器端口（68）。 路由器（60）选择性地将由导体（22,24）接收的磁共振信号从收发器通道（T / R）传送到多声道RF接收器（41）。 硬币元件可以携带正弦模式电流或均匀电流。

公开(公告)号：US08089281B2

公开(公告)日：2012-01-03

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： G01V3/00

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：US07683623B2

公开(公告)日：2010-03-23

申请号：US11917010

申请日：2006-06-13

申请人： Zhiyong Zhai ,  Michael A. Morich ,  Gordon D. DeMeester ,  Robert C. Gauss

发明人： Zhiyong Zhai ,  Michael A. Morich ,  Gordon D. DeMeester ,  Robert C. Gauss

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/3664

摘要： A radio frequency coil for magnetic resonance imaging or spectroscopy includes a plurality of generally parallel conductive members (70) surrounding a region of interest (14). One or more end members (72, 74) are disposed generally transverse to the plurality of parallel conductive members. A generally cylindrical radio frequency shield (32) surrounds the plurality of generally parallel conductive members. Switchable circuitry (80, 80′) selectably has: (i) a first switched configuration (90, 90′) in which the conductive members are operatively connected with the one or more end members; and (ii) a second switched configuration (92, 92′) in which the conductive members are operatively connected with the radio frequency shield. The radio frequency coil operates in a birdcage resonance mode in the first switched configuration and operates in a TEM resonance mode in the second switched configuration.

摘要翻译： 用于磁共振成像或光谱的射频线圈包括围绕感兴趣区域（14）的多个大致平行的导电构件（70）。 一个或多个端部构件（72,74）大致横向于多个平行导电构件设置。 通常为圆柱形的射频屏蔽（32）围绕多个大致平行的导电构件。 可切换电路（80,80'）可选择地具有：（i）第一开关构造（90,90'），其中导电构件与一个或多个端构件可操作地连接; 和（ii）其中导电构件与射频屏蔽可操作地连接的第二切换配置（92,92'）。 射频线圈在第一切换配置中以鸟笼共振模式工作，并且在第二切换配置中以TEM共振模式操作。

公开(公告)号：US20080186026A1

公开(公告)日：2008-08-07

申请号：US11913487

申请日：2006-04-19

申请人： Christoph G. Leussler ,  Kai-Michael Luedeke ,  Michael A. Morich ,  Zhiyong Zhai ,  Gordon D. DeMeester

发明人： Christoph G. Leussler ,  Kai-Michael Luedeke ,  Michael A. Morich ,  Zhiyong Zhai ,  Gordon D. DeMeester

IPC分类号： G01R33/422

CPC分类号： G01R33/422 ,  G01R33/3628

摘要： A radio frequency coil for magnetic resonance imaging includes an active coil member (70, 701, 170, 270) that defines an imaging volume. The active coil member has a first open end (74) with a first cross-sectional dimension (dactive). A shield coil member (72, 721, 722, 723, 724, 725, 172, 1722, 272) substantially surrounds the active coil member. The shield coil member has a constricted open end (88) arranged proximate to the first open end of the active coil member with a constricted cross-sectional dimension (dconst) that is less than the cross-sectional dimension (dShieid) of the shield coil member In some embodiments, the radio frequency coil further includes an outer shield coil member (100) that is substantially larger than the shield coil member (72, 721, 722, 723, 724, 725, 172, 1722, 272), and surrounds both the active coil member and the shield coil member.

摘要翻译： 用于磁共振成像的射频线圈包括限定成像体积的有源线圈构件（70,70A，170,270）。 有源线圈构件具有第一横截面尺寸（dactive）的第一开口端（74）。 屏蔽线圈构件（72,72，...，72，72，72，72，SUB） 大致围绕有源线圈构件。 屏蔽线圈构件具有靠近有源线圈构件的第一开口端布置的收缩的开口端（88），其缩小的横截面尺寸（dconst）小于屏蔽线圈的横截面尺寸（dShid） 在一些实施例中，射频线圈还包括外屏蔽线圈构件（100），该屏蔽线圈构件（100）基本上大于屏蔽线圈构件（72,72，...，72 < ，72个3，72个，72个，172个，172个，272个），并且包围两个 有源线圈构件和屏蔽线圈构件。

公开(公告)号：US20080164878A1

公开(公告)日：2008-07-10

申请号：US11908293

申请日：2006-03-03

申请人： Michael A. Morich ,  Shmaryu M. Shvartsman ,  Gordon D. DeMeester

发明人： Michael A. Morich ,  Shmaryu M. Shvartsman ,  Gordon D. DeMeester

IPC分类号： G01R33/3875

CPC分类号： G01R33/3875

摘要： In a magnetic resonance imaging system (10), a main magnet (20) generates a substantially uniform main magnetic field (B0) through an examination region (14). An imaging subject (16) generates inhomogeneities in the main magnetic field (B0). One or more shim coils are positioned adjacent a gradient coil (26). The gradient coil (26) is driven in halves by first and second power sources (28, 30) which have slightly dissimilar power characteristics which induce an inductive coupling between the shim coil (60) and the gradient coil (26). The shim coil (60) is designed to produce a desired magnetic field, such that the inductive coupling of the shim coils (60) to the gradient coil (26) is substantially minimized while the inhomogeneities in the main magnetic field (B0) caused by the imaging subject are corrected based on prespecified spatial characteristics.

摘要翻译： 在磁共振成像系统（10）中，主磁体（20）通过检查区域（14）产生基本上均匀的主磁场（B <0> 0）。 成像对象（16）在主磁场（B 0> 0）中产生不均匀性。 一个或多个垫片线圈邻近梯度线圈（26）定位。 梯度线圈（26）由具有稍微不相似的功率特性的第一和第二电源（28,30）驱动两半，其引起垫片线圈（60）和梯度线圈（26）之间的电感耦合。 垫片线圈（60）被设计成产生期望的磁场，使得垫片线圈（60）与梯度线圈（26）的电感耦合基本上最小化，而主磁场（B）中的不均匀性 基于预先确定的空间特性来校正由成像对象引起的0 ）。