-
公开(公告)号：US5289128A
公开(公告)日：1994-02-22
申请号：US859152
申请日：1992-03-27
IPC分类号： A61B5/055 , G01R33/20 , G01R33/38 , G01R33/385 , G01R33/421 , H01F6/00
CPC分类号： G01R33/3856 , G01R33/385 , G01R33/4215
摘要： An examination region (12) is defined within the bore of a superconducting magnet assembly (10). An RF coil (22) and gradient magnetic field coils (14) are disposed within the bore of the superconducting magnet assembly around the examination region. The superconducting magnet includes a hollow, cylindrical vacuum vessel (40). An annular, liquid helium holding low temperature reservoir (60) extends centrally through the vacuum vessel, but is sealed therefrom such that liquid helium is not drawn into the vacuum. A plurality of annular superconducting magnets (56) are received in the low temperature reservoir immersed in the liquid helium. A first cold shield (44) and a second cold shield (50) are mounted in the vacuum vessel surrounding the low temperature reservoir. A main magnetic field shield coil (66) is disposed in the low temperature reservoir outside of the annular superconducting magnets for canceling the magnetic field generated by the annular magnets surrounding the magnet. A gradient shield coil (70) is mounted in low temperature reservoir inside the annular superconducting magnets to cancel magnetic fields generated by the gradient magnetic field coils in the region beyond the gradient shield coil. The gradient shield coil is electromagnetically coupled to the gradient field coils to be driven by magnetic fields emanating therefrom. Optionally, the gradient shield coil can be constructed of a higher temperature superconducting material and disposed in association with one of the cold shields.
摘要翻译： 检查区域（12）被限定在超导磁体组件（10）的孔内。 RF线圈（22）和梯度磁场线圈（14）被布置在超导磁体组件的围绕检查区域的孔内。 超导磁体包括中空的圆柱形真空容器（40）。 一个环状的液氦保持低温储存器（60）在真空容器的中心延伸，但被密封，使得液氦不被吸入真空。 多个环形超导磁体（56）被容纳在浸入液氦的低温储存器中。 第一冷屏蔽（44）和第二冷屏蔽（50）安装在围绕低温储存器的真空容器中。 主磁场屏蔽线圈（66）设置在环形超导磁体外部的低温储存器中，用于抵消围绕磁体的环形磁体产生的磁场。 梯度屏蔽线圈（70）安装在环形超导磁体内部的低温储存器中，以消除梯度屏蔽线圈之外的区域中的梯度磁场线圈产生的磁场。 梯度屏蔽线圈与梯度场线圈电磁耦合，由其发出的磁场驱动。 可选地，梯度屏蔽线圈可以由更高温度的超导材料构成并且与其中一个冷屏蔽件相关联地设置。
-
公开(公告)号：US5406204A
公开(公告)日：1995-04-11
申请号：US80413
申请日：1993-06-21
IPC分类号： G01R33/20 , A61B5/055 , G01R33/3815 , G01R33/385 , G01R33/421 , G01R33/422
CPC分类号： G01R33/3815 , G01R33/385 , G01R33/421 , G01R33/422 , G01R33/3856 , G01R33/4215
摘要： The magnetic field assembly of a magnetic resonance imaging device includes an annular superconducting magnet (10) which is mounted within a toroidal vacuum vessel (24). A cylindrical member (26) defines a central bore through which the superconducting magnets generate a temporally constant primary magnetic field. A cylindrical, dielectric former (46) is mounted in the bore displaced a small distance from the cylindrical member. A radio frequency coil (32) is mounted within the cylindrical member defining a patient receiving examination region. An RF shield (34) is mounted around the exterior peripheral surface of the former. Primary gradient coils (40) are mounted around and potted to the exterior of the dielectric former around the RF shield. Gradient shield or secondary coils (44) are potted around an exterior of the cylindrical member within the vacuum chamber. As illustrated in FIG. 3 , when unshielded gradient coils are used, the primary gradient coils and the RF shield are mounted around the outer diameter of the cylindrical member (26).
摘要翻译： 磁共振成像装置的磁场组件包括安装在环形真空容器（24）内的环形超导磁体（10）。 圆柱形构件（26）限定中心孔，超导磁体通过该中心孔产生时间上不变的初级磁场。 圆柱形电介质成形器（46）安装在距离圆柱形构件较小距离的孔中。 射频线圈（32）安装在限定患者接收检查区域的圆柱形构件内。 RF屏蔽件（34）围绕前者的外周表面安装。 初级梯度线圈（40）围绕RF屏蔽件安装在电介质成形器的外部并且封装在外部。 梯度屏蔽或次级线圈（44）围绕真空室内的圆柱形构件的外部进行灌封。 如图1所示。 如图3所示，当使用非屏蔽梯度线圈时，主梯度线圈和RF屏蔽围绕圆柱形部件（26）的外径安装。
-
公开(公告)号：US5280247A
公开(公告)日：1994-01-18
申请号：US859154
申请日：1992-03-27
IPC分类号： A61B5/055 , G01R33/20 , G01R33/385 , G01R33/421
CPC分类号： G01R33/385
摘要： An examination region (12) is defined within the bore of a superconducting magnet assembly (10). An RF coil (22) and gradient magnetic field coils (14) are disposed within the bore of the superconducting magnetic assembly around the examination region. The superconducting magnet includes a hollow, tubular vacuum vessel (40) which contains a plurality of annular superconducting magnets (58). These superconducting magnets are held in a liquid helium holding reservoir (60) such that they are held below their superconducting temperature. A first cold shield (44) and a second cold shield (50 ) have tubular portions between the superconducting magnets and the examination region. These cylindrical portions each include a cylinder (70) of a electrically insulating material such as reinforced plastic. Thermally conductive layers (72) are defined on each surface and are divided by etched slots or resistance portions (74) into a multiplicity of elongated narrow segments (92). The narrow segments are constructed of a thermally conductive material, such as copper or aluminum, that also happens to be electrically conductive. The division of the foil layer into a multiplicity of segments divides the generated eddy currents into a like multiplicity of substantially canceling eddy currents (82) increasing the eddy current path length, increasing the total electrical resistance encountered, and reducing the amplitude and time constant of the resultant net eddy current and eddy magnetic field.
摘要翻译： 检查区域（12）被限定在超导磁体组件（10）的孔内。 RF线圈（22）和梯度磁场线圈（14）被布置在围绕检查区域的超导磁性组件的孔内。 超导磁体包括中空管状真空容器（40），其包含多个环形超导磁体（58）。 这些超导磁体被保持在液氦保持容器（60）中，使得它们保持在其超导温度以下。 第一冷屏蔽（44）和第二冷屏蔽（50）在超导磁体和检查区域之间具有管状部分。 这些圆柱形部分各自包括诸如增强塑料的电绝缘材料的圆筒（70）。 导热层（72）被限定在每个表面上，并被蚀刻的槽或电阻部分（74）分成多个细长窄段（92）。 窄段由也可能导电的导热材料（例如铜或铝）构成。 将箔层划分为多个段将生成的涡流分成相当大量的基本上消除的涡流（82），增加涡流路径长度，增加所遇到的总电阻，并减小振幅和时间常数 得到的净涡流和涡流磁场。
-
公开(公告)号：US5424643A
公开(公告)日：1995-06-13
申请号：US80564
申请日：1993-06-21
IPC分类号： G01R33/20 , A61B5/055 , G01R33/34 , G01R33/385 , G01R33/421 , G01R33/422
CPC分类号： G01R33/34 , G01R33/385 , G01R33/422 , G01R33/3856 , G01R33/4215
摘要： A magnetic resonance imaging machine includes a toroidal vacuum dewer (24) which contains a superconducting magnet (10). A radio frequency coil (32) is mounted within a cylindrical bore (26) of the vacuum dewer. A cylindrical, dielectric former (46) supports an RF shield (34), a z-gradient coil (50), an x-gradient coil (52), and a y-gradient coil (54). The x and y-gradient coils are each composed of four like spiral coil constructions. A metallic layer is cut with cut lines (64) to define a generally spiral coil winding pattern. In a high current density region (68) in which the coil windings are narrower than a preselected width, the cut lines (76) are thinner. In lower current density regions (70), the cut lines (78) are thicker. In lower current density regions, two cut lines are defined between adjacent coil windings such that the coil windings are limited to a maximum width. Conductive islands (80) defined in the lower current density areas which are large enough to support detrimental eddy currents are preferably removed or at least modified such that their ability to support detrimental eddy currents is curtailed.
摘要翻译： 磁共振成像机包括含有超导磁体（10）的环形真空脱水器（24）。 射频线圈（32）安装在真空脱水器的圆柱形孔（26）内。 圆柱形电介质成形器（46）支撑RF屏蔽（34），z-梯度线圈（50），x-梯度线圈（52）和y-梯度线圈（54）。 x和y梯度线圈由四个类似的螺旋线圈结构组成。 用切割线（64）切割金属层以限定大致螺旋线圈绕组图案。 在其中线圈绕组比预选宽度窄的高电流密度区域（68）中，切割线（76）更薄。 在较低电流密度区域（70）中，切割线（78）较厚。 在较低的电流密度区域中，在相邻的线圈绕组之间限定两个切割线，使得线圈绕组被限制到最大宽度。 限定在足够大以支持有害涡流的较低电流密度区域中的导电岛（80）优选地被去除或至少被修改，使得它们支持有害涡流的能力受到限制。
-
公开(公告)号：US08525116B2
公开(公告)日：2013-09-03
申请号：US12670256
申请日：2008-06-23
CPC分类号： G01T1/1603
摘要： An imaging system includes positron emission tomography (PET) detectors (30) shrouded by broadband galvanic isolation (99) and coincidence detection electronics (50, 50ob), or other radiation detectors. A magnetic resonance scanner includes a main magnet (12, 14) and magnetic field gradient assembly (20, 20′, 22, 24) configured to acquire imaging data from a magnetic resonance examination region at least partially overlapping the examination region surrounded by the PET detectors. A radio frequency coil (80, 100) has plurality of conductors (66, 166) and a radio frequency screen (88, 188, 188EB, 188F) substantially surrounding the conductors to shield the coil at the magnetic resonance frequency. The radiation detectors are outside of the radio frequency screen. Magnetic resonance-compatible radiation collimators or shielding (60, 62) containing an electrically non-conductive and non-ferromagnetic heavy atom oxide material are disposed with the radiation detectors.
摘要翻译： 一种成像系统包括由宽带电流隔离（99）和重合检测电路（50,50ob）或其他辐射检测器覆盖的正电子发射断层摄影（PET）检测器（30）。 磁共振扫描仪包括主磁体（12,14）和磁场梯度组件（20,20'，22,24），其被配置为从至少部分地与由PET包围的检查区域重叠的磁共振检查区域获取成像数据 探测器 射频线圈（80,100）具有基本上围绕导体以屏蔽线圈的磁共振频率的多个导体（66,166）和射频屏（88,188,188EB，188F）。 辐射探测器在射频屏幕之外。 磁辐射准直仪或包含非导电和非铁磁重原子氧化物材料的屏蔽（60,62）与辐射探测器一起设置。
-
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。
-
公开(公告)号：US07495443B2
公开(公告)日：2009-02-24
申请号：US10595862
申请日：2004-11-03
申请人： Christoph G. Leussler , Christian Findeklee , Michael A. Morich , Zhiyong Zhai , Gordon D. DeMeester
发明人： Christoph G. Leussler , Christian Findeklee , Michael A. Morich , Zhiyong Zhai , Gordon D. DeMeester
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/34046 , G01R33/34076 , G01R33/345 , G01R33/3453 , G01R33/3635 , G01R33/3642 , G01R33/365 , G01R33/3678 , G01R33/422 , G01R33/5659
摘要： A radio frequency coil system (38) for magnetic resonance imaging includes a plurality of parallel spaced apart rungs (60) which each includes rung capacitors (68). An end cap (64) is disposed at a closed end (66) of the coil system (38). An RF shield (62) is connected to the end cap (64) and surrounds the rungs (60), extending in a direction substantially parallel to rungs (60). The RF coil system (38) may be used as birdcage, TEM, hybrid, combination birdcage and TEM, or other.
摘要翻译： 一种用于磁共振成像的射频线圈系统（38）包括多个平行隔开的梯级（60），每个梯级包括梯级电容器（68）。 端盖（64）设置在线圈系统（38）的封闭端（66）处。 RF屏蔽（62）连接到端盖（64）并且围绕梯级（60）沿着基本平行于梯级（60）的方向延伸。 RF线圈系统（38）可以用作鸟笼，TEM，混合，组合鸟笼和TEM等。
-
公开(公告)号：US20080197848A1
公开(公告)日：2008-08-21
申请号：US11917010
申请日：2006-06-13
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：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。
-
10.发明授权公开(公告)号：US08089281B2
公开(公告)日：2012-01-03
申请号：US12528541
申请日：2008-01-30
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）。
-
-
-
-
-
-
-
-
-
搜索结果
66 条记录 (耗时 0.025 秒)
