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公开(公告)号：EP1102079A2
公开(公告)日：2001-05-23
申请号：EP00309888.6
申请日：2000-11-07
IPC分类号： G01R33/385
CPC分类号： G01R33/385 , G01R33/3806
摘要： A uniplanar gradient coil assembly (40) generates substantially linear gradient magnetic fields through an examination region (14) . The gradient coil assembly (40) includes at least a pair of primary uniplanar gradient coil sets (40a, 40b) and a pair of shield coil sets (41a, 41b) which are disposed in an overlapping relationship. One gradient coil set is displaced relative to the other gradient coil set such that the mutual inductance between the two is minimized. Preferably, the coil sets (40a, 40b, 41a, 41b) are symmetric, such that the sweet spot of each coil is coincident with the geometric centre of each coil. One primary uniplanar gradient coil set (40a) is a high efficiency, high switching speed coil to enhance performance of ultrafast magnetic resonance sequences, while the second primary uniplanar gradient coil set (40b) is a low efficiency coil which generates a high quality gradient magnetic field, but with slower switching speeds. By displacing one gradient coil set relative to the other, mutual inductance is minimized, which maximizes peak gradient, rise time, and slew rate, while dB/dt levels are minimized. In one embodiment, the uniplanar gradient coil assembly (40) is housed within an interior of a couch (30) .
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72.发明公开Planning minimally invasive procedures for in - vivo placement of objects 审中-公开Planung von minimal-invasiven prozedurenfürin vivo Einsetzen von Objekten
公开(公告)号：EP1095628A2
公开(公告)日：2001-05-02
申请号：EP00309491.9
申请日：2000-10-27
发明人： Yanof, Jeffrey H. , Klahr, Paul , Ivan, Andy , Hoffmeyer, Dave
IPC分类号： A61B19/00
摘要： A method (310) and apparatus (1) are provided for planning an executing minimally invasive procedures for in-vivo placement of objects within the body of a patient. The method and apparatus enable non-invasive pre-operation virtual seed placement and dose distribution planning using visualization information showing a patient's anatomy together with a set of single point targets (182) within the patient's body and a corresponding set of trajectories (184) through the skin and body of the patient leading to the selected target points. For enhanced visualization, multi-planar reformatted images (166, 168) are derived from CT image data sets and are angled to always contain the plane of the virtual needle (300) in the pseudo-axial image and its 90 degree slice counterpart. In an implementation stage, a stereotactic arm (40) spatially referenced to the patient's data set acts a needle guide (52) and is used to locate preplanned image planes containing virtual seed deposition points. A physical needle (50) is aligned with preplanned virtual needle trajectories (282, 284, 286) so that one or more seeds or other objects can be precisely placed within the patient's body.
摘要翻译： 提供了一种方法（310）和装置（1），用于规划用于体内放置患者身体内的物体的执行的微创程序。 所述方法和装置使得能够使用显示患者解剖结构的可视化信息以及（50）患者身体内的一组单点目标（182）和相应的一组轨迹（...）来进行非侵入性的预操作虚拟种子放置和剂量分布规划 184）通过穿过所选择的目标点的患者的皮肤和身体（70）。 为了增强可视化，多平面重新格式化图像（166,168）从CT（90）图像数据集导出，并且成角度以在伪轴图像中始终包含虚拟针（300）的平面（200），并且其 90度切片对应。 在实施阶段（120）中，在空间上参考患者数据集的立体定向臂（40）作用于针引导件（52），并用于定位包含虚拟种子沉积点的预计（160）图像平面。
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公开(公告)号：EP1095620A1
公开(公告)日：2001-05-02
申请号：EP00309130.3
申请日：2000-10-17
IPC分类号： A61B6/03
CPC分类号： F16C37/002 , A61B6/035 , A61B6/4488 , F16C32/0614 , F16C32/064 , F16C32/0696 , F16C2300/14 , F16C2316/10
摘要： A CT scanner for obtaining a medical diagnostic image of a subject includes a stationary gantry (12) , and a rotating gantry (16) rotatably supported on the stationary gantry (12) for rotation about the subject. A fluid bearing (18) is interposed between the stationary and rotating gantries (12) and (16) , respectively. The fluid bearing (18) provides a fluid barrier (110) which separates the rotating gantry (16) from the stationary gantry (12) . In a preferred embodiment, the fluid bearing (18) provides for quieter CT scanner operation at high rotational speeds. Moreover, eliminating the physical contact between the gantries minimizes wear and optimizes longevity.
摘要翻译： 用于获得对象的医学诊断图像的CT扫描仪包括固定机架（12）和可旋转地支撑在固定机架（12）上以围绕被摄体旋转的旋转机架（16）。 流体轴承（18）分别介于固定和旋转机架（12）和（16）之间。 流体轴承（18）提供将旋转机架（16）与固定机架（12）分离的流体屏障（110）。 在优选实施例中，流体轴承（18）以高转速提供更安静的CT扫描仪操作。 此外，消除龙门架之间的物理接触使磨损最小化并优化寿命。
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公开(公告)号：EP1061379A2
公开(公告)日：2000-12-20
申请号：EP00116949.9
申请日：1994-06-03
IPC分类号： G01R33/38
CPC分类号： G01R33/34 , G01R33/385 , G01R33/3856 , G01R33/4215 , G01R33/422
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。 一个圆柱形电介质成形器（46）支撑RF屏蔽层（34），z-梯度线圈（50），x-梯度线圈（52）和一个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，在相邻线圈绕组之间限定两条切割线，使得线圈绕组被限制在最大宽度。 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：EP1130413A3
公开(公告)日：2003-07-30
申请号：EP01301836.1
申请日：2001-03-01
发明人： Chmielewski, Thomas
IPC分类号： G01R33/36
CPC分类号： G01R33/3657
摘要： A magnetic resonance imaging apparatus creates images by exciting magnetic resonance in selected nuclei disposed within an image region. Through the image region a main magnetic field (B 0 ) is applied and transverse gradients are produced. At selected times a high power RF pulse is applied to the imaging region causing the selected nuclei to resonate. These magnetic resonance signals are detected by a receive coil (D 1 , D 2 ) and converted into an image representation viewable on a display (24). Images are obtained by repeating the transmit and receive portions until enough image data is received to produce an image. The receive coil (D 1 , D 2 ) includes first decoupler circuits (28) arranged about the coil. During the transmit portion of the cycle, the decoupler circuits sense the high power RF pulse and decouple the coil. High speed switching diodes or PIN diodes are excited by the transmit RF pulse to switch inductors (40) into the coil to decouple the receive coil. During a receive portion of a cycle in which the coil is not used, a DC bias is selectively applied to the coil forcing the diodes on, actively decoupling the coil. The DC bias also biases a diode switch (50, 50') to short the input of a preamplifier element (48, 48') providing protection.
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公开(公告)号：EP1130412A3
公开(公告)日：2003-07-16
申请号：EP01301806.4
申请日：2001-02-28
发明人： Stauber, John R. , Burl, Michael
IPC分类号： G01R33/28
CPC分类号： G01R33/36 , G01R33/34007 , G01R33/543
摘要： A magnetic resonance imaging system includes a patient couch (10) which selectively positions a patient relative to an examination region. An imaging coil (B) is disposed adjacent to a region of interest for receiving magnetic resonance signals emanating from the patient. A processor (48) both controls the imaging event and processes received signals from the imaging coil. A plug and socket assembly (24, 26) having a proximal component and a distal component relative to the imaging coil provides selective electrical connectivity between the imaging coil (B) and the processor (48). A non-volatile memory device (86), such as a 1-WIRE™ EEPROM, is affixed to the proximal component of the plug and socket assembly (24, 26) for storing a variety attributes associated with the imaging coil. The memory device is most conveniently mounted to a coaxial connector (110).
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公开(公告)号：EP0562708B1
公开(公告)日：2003-05-14
申请号：EP93300595.1
申请日：1993-01-27
IPC分类号： G01R33/38
CPC分类号： G01R33/3856 , G01R33/385 , G01R33/4215
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公开(公告)号：EP0969293B1
公开(公告)日：2003-02-26
申请号：EP98305168.1
申请日：1998-06-30
CPC分类号： G01T1/1615 , A61B6/037 , G01T1/1603 , G01T1/1648 , G01T1/2985
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公开(公告)号：EP1279173A2
公开(公告)日：2003-01-29
申请号：EP01966253.5
申请日：2001-08-24
发明人： ROCA, Tony , ANDERSON, John
摘要： A high voltage low inductance resistor (120) includes a resistor body (122) having a perimeter and a center. A first terminal (126) is located away from the center of the resistor near the perimter of the body (122). A serpentine resistance element (130) includes a first end (136). A conductive ring (124) is located near the perimeter and circumscribes the serpentine resistance element (130). The ring (124) is electrically connected to the first terminal (126). The first end (136) is electrically connected to the conductive ring (124). A first resistance segment (138a) of the resistance element (130) begins at the first end (136) and extends in a first direction generally around the perimeter of the body (122). An apex (142a) redirects the resistance element in a generally opposite direction, the input portion (143) transitioning into the first resistance segment (138a). A second resistance segment (140a) exits the apex (142a) from the output portion (145) in a second direction generally opposite the direction of the first resistance segment 8138a). The second resistance segment (140a) is located adjacent to and spaced apart from the first resistance segment (138a). The pattern of the interconnected first and second resistance segments is arranged to provide a concentric serpentine pattern in a single plane. A second end (148) of the resistance element (130) is located approximately at the center of the resistor element. A second terminal (128) is located at the center of the resistor (120) and is electrically connected to the second end (148) of the serpentine resistance element (130).
摘要翻译： 高电压低电感电阻器（120）包括具有周边和中心的电阻器主体（122）。 第一端子（126）远离靠近主体（122）的定界器的电阻器的中心定位。 蛇形阻力元件（130）包括第一端（136）。 导电环（124）位于周边附近并包围蛇形电阻元件（130）。 环（124）电连接到第一端子（126）。 第一端（136）电连接到导电环（124）。 阻力元件（130）的第一阻力段（138a）开始于第一端部（136）并且在大致围绕主体（122）的周边的第一方向上延伸。 顶点（142a）沿大致相反的方向改变阻力元件的方向，输入部分（143）过渡到第一阻力段（138a）。 第二阻力节段（140a）沿大致与第一阻力节段8138a的方向相反的第二方向从输出部分（145）离开顶点（142a）。 第二阻力节段（140a）位于第一阻力节段（138a）附近并与第一阻力节段（138a）间隔开。 相互连接的第一和第二阻力段的图案被布置成在单个平面中提供同心蛇形图案。 电阻元件（130）的第二端（148）大致位于电阻元件的中心。 第二端子（128）位于电阻器（120）的中心并且电连接到蛇形电阻元件（130）的第二端（148）。
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公开(公告)号：EP0710852B1
公开(公告)日：2002-09-11
申请号：EP95307190.9
申请日：1995-10-11
IPC分类号： G01R33/3873
CPC分类号： G01R33/3873 , G01R33/385
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