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公开(公告)号：US07403004B2
公开(公告)日：2008-07-22
申请号：US10595582
申请日：2004-10-07
IPC分类号： G01V3/00
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。
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公开(公告)号：US07282914B2
公开(公告)日：2007-10-16
申请号：US10560870
申请日：2004-06-30
IPC分类号： G01V3/00
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.
摘要翻译： 提供MRI装置。 该装置包括用于在检查区域中产生主磁场的主磁体，用于在主场内产生梯度场的多个梯度线圈，用于将RF信号发送到检查区域中的激励磁共振的RF发射线圈 根据多个成像参数设置在其中，所发送的RF信号具有与其相关联的SAR，以及SAR处理器，用于将发射的RF信号保持在规定的SAR水平以下。
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公开(公告)号：US07276906B2
公开(公告)日：2007-10-02
申请号：US10535530
申请日：2003-10-29
IPC分类号： G01V3/00
CPC分类号： G01R33/385 , G01R33/421 , G01R33/4215
摘要： A gradient coil for a magnetic resonance imaging apparatus (10) includes a primary coil (16) defining an inner cylindrical surface (60), and shield coil (18) or coils defining a coaxial outer cylindrical surface (62). Coil jumps (74)connect the primary and shield coils (16, 18). The coil jumps (74) define a non-planar current-sharing surface (64) extending between inner and outer contours (66, 68) that coincide with the inner and outer cylindrical surfaces (60, 62), respectively. The coil (16, 18, 74) defines a current path that passes across the current sharing surface (64) between the inner and outer contours (66, 68) a plurality of times. Optionally, some primary coil turns (70) are electrically interconnected to define an isolated primary sub coil (P2) that together with a second shield (S2, S2′, S2″) enables a discretely or continuously selectable field of view.
摘要翻译： 用于磁共振成像装置（10）的梯度线圈包括限定内圆柱形表面（60）的初级线圈（16）和限定同轴外圆柱形表面（62）的屏蔽线圈（18）或线圈。 线圈跳跃（74）连接主和屏蔽线圈（16,18）。 线圈跳跃（74）限定分别在与内圆柱形表面（60）和外圆柱形表面（62）重合的内外轮廓（66,68）之间延伸的非平面分流表面（64）。 线圈（16,18,74）限定了在内外轮廓（66,68）之间穿过电流共享表面（64）多次的电流路径。 可选地，一些初级线圈匝（70）电互连以限定与第二屏蔽（S 2，S 2'，S 2“）一起的隔离的初级次级线圈（P 2），使得能够离散地或连续地选择 视图。
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公开(公告)号：US6100695A
公开(公告)日：2000-08-08
申请号：US454513
申请日：1999-12-06
IPC分类号： A61B5/055 , G01R33/3875 , G01V3/00
CPC分类号： G01R33/3875
摘要： A localized shim coil (34) for use in a magnetic resonance imaging system includes a plurality of conductive elements (22a-d). The plurality of conductive elements (62a-d) are connected to a current source (64). The plurality of conductive elements (62a-d) are arranged adjacent to a localized region of a subject being imaged such that current flowing through the conductive elements generates a localized magnetic field. A plurality of series connected choke and resister pairs (66a-d) and (68a-d), respectively, are connected to the plurality of conductive elements (62a-d). The chokes (66a-d) present high impedance to currents having frequencies substantially the same as a resonant frequency of the magnetic resonance imaging system. The resisters (68a-d) balance the current flowing through each conductive element (62a-d). The localized magnetic field is generated such that it is substantially equal and opposite to localized non-uniformities generated in the magnetic resonance system's main magnetic field by the subject's geometric shape and magnetic susceptibility in the localized region being imaged.
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25.发明授权
公开(公告)号：US6011394A
公开(公告)日：2000-01-04
申请号：US908359
申请日：1997-08-07
IPC分类号： G01R33/385 , A61B5/055 , G01R33/421 , H01F7/20 , G01V3/00
CPC分类号： G01R33/4215 , G01R33/3856
摘要： A superconducting magnetic imaging apparatus includes a vacuum vessel (16) having a central helium reservoir (20) in which superconducting magnetic coil windings (12) are maintained at a superconducting temperature. The vacuum vessel defines an internal bore (22) within which a self-shielded gradient coil assembly (26) and an RF coil (30) are received. The self-shielded coil assembly includes a single former (50) which defines an imaging region (14) within which an imaged portion of a subject is received. Primary x, y, and z-gradient coils (72-76) are positioned over an RF ground screen (70) that is bonded to the former (50). A number of comb-like spacers (84) extend from the former to supporting shield x, y, and z-gradient coils (110-114). The comb-like spacers define passages between the primary and secondary gradient coils which receive inner and outer cooling tubes (90, 92) and shim tray molds (108). The fully assembled gradient coil assembly is potted to form a unitary structure in a single potting step. The shim tray molds are subsequently removed to define channels or pockets suitable for receiving shim trays (118).
摘要翻译： 超导磁性成像装置包括具有中心氦储存器（20）的真空容器（16），超导磁性线圈绕组（12）保持在超导温度下。 真空容器限定内部孔（22），在其内接收自屏蔽梯度线圈组件（26）和RF线圈（30）。 自屏蔽线圈组件包括限定成像区域（14）的单个成形器（50），在该成像区域内接收被摄体的成像部分。 主x，y和z梯度线圈（72-76）位于结合到前者（50）的RF接地屏（70）上。 多个梳状间隔物（84）从前者延伸到支撑屏蔽x，y和z-梯度线圈（110-114）。 梳状间隔件限定了接收内部和外部冷却管（90,92）和垫片托盘模具（108）的主梯度线圈和次级梯度线圈之间的通道。 完全组装的梯度线圈组件被封装以在单个灌封步骤中形成单一结构。 随后卸下垫片托盘模具以限定适于接收垫片托盘（118）的通道或袋子。
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公开(公告)号：US5942898A
公开(公告)日：1999-08-24
申请号：US988045
申请日：1997-12-10
IPC分类号： G01R33/38 , G01R33/381 , G01R33/385 , G01V3/00
CPC分类号： G01R33/385 , G01R33/3806 , G01R33/381
摘要： A magnetic resonance imaging apparatus has a main magnet (20) having opposite first and second poles (22, 24) arranged facing one another to define a subject receiving region (14) therebetween. The main magnet (20) generates a main magnetic field (12) within the subject receiving region (14). The main magnetic field (12) has non-uniformities and radial components at the periphery of the subject receiving region (14). A radio frequency coil (74) is disposed about the subject receiving region (14) to transmit radio frequency signals into the subject receiving region (14) and a receiver receives radio frequency signals therefrom. A shielded thrust balanced bi-planar gradient coil assembly (50) is included. The shielded thrust balanced bi-planar gradient coil assembly (50) has at least one pair of windings for generating substantially linear magnetic gradients across the subject receiving region (14). Each pair of windings includes a first set of windings (52) and a second set of windings (54), and each set of windings includes at least a primary winding (56) and a secondary winding (58). The first and second set of windings (52, 54) are positioned on opposite sides of the subject receiving region (14) near the first and second pole pieces (22, 24). The secondary windings (58) are positioned between their respective primary windings (56) and their associated pole pieces (22, 24). The first and second set of windings (52, 54) are arranged such that the net thrust forces acting thereon generated by interaction between the main magnetic field (12) and electrical current pulses through the windings are substantially zero.
摘要翻译： 磁共振成像装置具有主磁体（20），该主磁体具有相对的彼此面对的第一和第二极（22,24），以在它们之间限定对象接收区域（14）。 主磁体（20）在对象接收区域（14）内产生主磁场（12）。 主磁场（12）在对象接收区域（14）的周围具有不均匀性和径向分量。 射频线圈（74）围绕被摄体接收区域（14）设置，以将射频信号传输到被摄体接收区域（14），并且接收器从其接收射频信号。 包括屏蔽推力平衡双平面梯度线圈组件（50）。 屏蔽推力平衡双平面梯度线圈组件（50）具有至少一对绕组，用于在对象接收区域（14）上产生基本线性的磁梯度。 每对绕组包括第一组绕组（52）和第二组绕组（54），并且每组绕组至少包括初级绕组（56）和次级绕组（58）。 第一和第二组绕组（52,54）位于第一和第二极片（22,24）附近的对象接收区域（14）的相对侧上。 次级绕组（58）位于它们各自的初级绕组（56）及其相关联的极片（22,24）之间。 第一和第二组绕组（52,54）被布置成使得通过主磁场（12）和通过绕组的电流脉冲之间的相互作用产生的净推力大致为零。
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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。
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公开(公告)号：US5177441A
公开(公告)日：1993-01-05
申请号：US719334
申请日：1991-06-21
申请人： Michael A. Morich , John L. Patrick , Labros Petropoulos , Michael A. Martens , Robert W. Brown
发明人： Michael A. Morich , John L. Patrick , Labros Petropoulos , Michael A. Martens , Robert W. Brown
IPC分类号： A61B5/055 , G01R33/381 , G01R33/385
CPC分类号： G01R33/385
摘要： An examination region (12) is defined by an elliptically crossed-section cylinder (20) of a non-conductive, non-magnetic material. The x, y, and z-gradient coils (24, 26, 22) are mounted on elliptically crossed-section cylindrical surfaces along the former for causing gradient magnetic fields within the examination region. Each of the x, y, and z-gradient coils includes a plurality of arrays or groups of coil loops. The arrays of coil loops are symmetric about a central plane of symmetry. To either side of the plane of symmetry, each of the first of the x, y, and z coil arrays (74, 80, 90) include at least a first group of loops in which current flows in a clockwise direction and a second array of loops (76, 82, 90) in which current flows in an opposite direction.
摘要翻译： 检查区域（12）由非导电非磁性材料的椭圆形截面圆柱体（20）限定。 x，y和z梯度线圈（24,26,22）沿着前者安装在椭圆形横截面的圆柱形表面上，用于引起检查区域内的梯度磁场。 x，y和z梯度线圈中的每一个包括多个阵列或一组线圈环。 线圈环的阵列关于中心对称平面对称。 在对称平面的任一侧，x，y和z线圈阵列（74,80,90）中的第一个线圈阵列（74,80,90）中的每一个包括至少第一组电流，其中电流沿顺时针方向流动，第二阵列 （76,82,90），其中电流沿相反方向流动。
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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.
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公开(公告)号：US08516636B2
公开(公告)日：2013-08-27
申请号：US12195655
申请日：2008-08-21
IPC分类号： A61B6/04
CPC分类号： A61B5/0555 , A61B5/0035 , A61B6/032 , A61B6/037 , A61B6/4417 , A61B6/4429
摘要： A hybrid imaging system and a patient bed for same are disclosed. The hybrid imaging system includes a magnetic resonance scanner and a second modality imaging system spaced apart from the magnetic resonance scanner by a gap. In some embodiments, the gap is less than seven meters. The patient bed is disposed at least partially in the gap between the magnetic resonance scanner and the second modality imaging system, and includes a linearly translatable patient support pallet aligned to be selectively moved into an examination region of the magnetic resonance scanner for magnetic resonance imaging and into an examination region of the second modality imaging system for second modality imaging. In some embodiments, a linear translation range of the linearly translatable pallet is less than five times a length of the patient support pallet along the direction of linear translation.
摘要翻译： 公开了一种混合成像系统和用于其的患者床。 混合成像系统包括磁共振扫描器和通过间隙与磁共振扫描器隔开的第二模态成像系统。 在一些实施例中，间隙小于7米。 患者床至少部分地设置在磁共振扫描仪和第二模态成像系统之间的间隙中，并且包括可选择性地移动到用于磁共振成像的磁共振扫描仪的检查区域中的线性可平移的患者支撑托盘， 进入用于第二模态成像的第二模态成像系统的检查区域。 在一些实施例中，线性平移托盘的线性平移范围小于患者支撑托盘沿线性平移方向的长度的五倍。
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