公开(公告)号：EP0629875B1

公开(公告)日：2002-07-10

申请号：EP94304007.1

申请日：1994-06-03

申请人： Marconi Medical Systems, Inc.

发明人： Morich, Michael A. ,  Demeester, Gordon D. ,  Patrick, John L. ,  Zou, Xueming, (NMI)

IPC分类号： G01R33/38 ,  G01R33/42

CPC分类号： G01R33/3815 ,  G01R33/385 ,  G01R33/3856 ,  G01R33/421 ,  G01R33/4215 ,  G01R33/422

公开(公告)号：EP1004885A3

公开(公告)日：2002-05-02

申请号：EP99308922.6

申请日：1999-11-09

申请人： Marconi Medical Systems, Inc.

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

IPC分类号： G01R33/341

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 (C V ) 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 (C A ) 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被摄体中的选定细胞核中激发磁共振。 谐振核产生由正交高通梯形线圈（D）接收的射频磁共振信号。 高速梯形线圈包括具有围绕中点（44）对称设置的电容元件（CV）的中心支脚（34）。 相似数量的附加腿（30,32,36,38）平行于对称地设置在中心腿的相对侧上。 侧元件（40,42）包括互连每个支腿的相邻端部的电容元件（CA）。 电容元件围绕中点（44）对称设置，并且被选择为使得线圈支持包括奇数模式（50）和偶模式（52）的至少两个固有谐振模式。 偶数模式对线圈平面中的场敏感，奇数模式对垂直于线圈的平面中的场敏感。

公开(公告)号：EP1182613A2

公开(公告)日：2002-02-27

申请号：EP01306563.6

申请日：2001-07-31

申请人： Marconi Medical Systems, Inc.

发明人： Liu, Kecheng ,  Margosian, Paul M.

IPC分类号： G06T11/00

CPC分类号： G06T11/206

摘要： A diagnostic imaging system (100) and method generates a plurality of temporally resolved volume image representations (130, 132, ..., 134). A time course projection processor (140) temporally collapses the volume image representations. A spatial projection processor (146) performs a maximum or minimum intensity process along rays through voxels of a three-dimensional image representation. By sequentially temporally collapsing and maximum or minimum intensity projecting, in either order, the plurality of temporally resolved volume image representations is reduced to a two-dimensional temporally collapsed and spatially projected image representation (148) . In preferred embodiments, the present invention is directed to angiography, and more preferably to magnetic resonance angiography. In certain embodiments, time course information, such as blood flow rate information, vessel wall dynamics, contrast agent propagation, contrast agent peak arrival time, and the like, is logged in a database, providing additional diagnostic information or timing information for future reference. In this manner, more accurate images of vessel lumina, as well as blood flow time variant effects, are obtained.

摘要翻译： 诊断成像系统（100）和方法产生多个时间分辨的体积图像表示（130,132，...，134）。 时间投影处理器（140）暂时压缩音量图像表示。 空间投影处理器（146）沿着三维图像表示的体素的光线执行最大或最小强度处理。 通过顺序时间折叠和最大或最小强度投影，以任一顺序，多个时间分辨的体积图像表示被减少到二维时间折叠和空间投影的图像表示（148）。 在优选实施方案中，本发明涉及血管造影术，更优选磁共振血管造影术。 在某些实施例中，记录在数据库中的时间过程信息，例如血液流量信息，血管壁动力学，造影剂传播，造影剂峰值到达时间等，提供用于将来参考的附加诊断信息或定时信息。 以这种方式，获得血管腔的更精确的图像以及血流时间变化的效果。

公开(公告)号：EP1176558A2

公开(公告)日：2002-01-30

申请号：EP01305805.2

申请日：2001-07-05

申请人： Marconi Medical Systems, Inc.

发明人： Steckner, Michael ,  Ruohonen, Jarmo O. ,  Demeester, Gordon D. ,  Carlson, Robert K.

IPC分类号： G06T7/00

CPC分类号： G06K9/3216 ,  G06K2209/05 ,  G06T7/33 ,  G06T2207/10028 ,  G06T2207/10088 ,  G06T2207/30096

摘要： An open MRI or other diagnostic imaging system ( A ) generates a three-dimensional diagnostic image representation, which is stored in an MRI image memory (26). A laser scanner or other surface imaging system (B) generates a volumetric surface image representation that is stored in a surface image memory ( 34 ). Typically, the volume and surface images are misaligned and the magnetic resonance image may have predictable distortions. An image correlating system ( C ) determines offset, scaling, rotational, and non-linear corrections to the magnetic resonance image representation, which are implemented by an image correction processor ( 48 ). The corrected magnetic resonance image representation and the surface image representation are combined ( 50 ) and stored in a superimposed image memory ( 52 ). A video processor ( 54 ) generates image representations from selected portions of the superimposed image representation for display on a human-readable monitor ( 56 ).

摘要翻译： 开放MRI或其它诊断成像系统（A）产生存储在MRI图像存储器（26）中的三维诊断图像表示。 激光扫描仪或其他表面成像系统（B）产生存储在表面图像存储器（34）中的体积表面图像表示。 通常，体积和表面图像不对准，并且磁共振图像可能具有可预测的失真。 图像相关系统（C）确定由图像校正处理器（48）实现的磁共振图像表示的偏移，缩放，旋转和非线性校正。 将校正的磁共振图像表示和表面图像表示组合（50）并存储在叠加图像存储器（52）中。 视频处理器（54）从叠加的图像表示的选定部分生成图像表示，以在人类可读监视器（56）上显示。

公开(公告)号：EP1006370A3

公开(公告)日：2002-01-16

申请号：EP99309336.8

申请日：1999-11-23

申请人： Marconi Medical Systems, Inc.

发明人： Hawkins, William G. ,  Gagnon, Daniel

IPC分类号： G01T1/29

CPC分类号： G01T1/1615 ,  A61B6/037 ,  G01T1/2985

摘要： A method of ML-EM image reconstruction is provided for use in connection with a diagnostic imaging apparatus ( 10 ) that generates projection data. The method includes collecting projection data, including measured emission projection data. An initial emission map and attenuation map are assumed. The emission map and the attenuation map are iteratively updated. With each iteration, the emission map is recalculated by taking a previous emission map and adjusting it based upon: (i) the measured emission projection data; (ii) a reprojection of the previous emission map which is carried out with a multi-dimensional projection model; and, (iii) a reprojection of the attenuation map. As well, with each iteration, the attenuation map is recalculated by taking a previous attenuation map and adjusting it based upon: (i) the measured emission projection data; and, (ii) a reprojection of the previous emission map which is carried out with the multi-dimensional projection model. In a preferred embodiment, with source-assisted reconstruction, the recalculation of the attenuation map is additionally based upon: (iii) measured transmission projection data; and (iv) a reference or blank data set of measured transmission projection data taken without the subject present in the imaging apparatus ( 10 ).

公开(公告)号：EP1164822A2

公开(公告)日：2001-12-19

申请号：EP01305150.3

申请日：2001-06-13

申请人： Marconi Medical Systems, Inc.

发明人： Miller, Thomas R ,  Panasik, Cheryl L ,  Lu, Qing

IPC分类号： H05G1/04

CPC分类号： H01J35/106 ,  H01J2235/1208 ,  H01J2235/1262 ,  H05G1/025 ,  H05G1/04

摘要： An x-ray tube apparatus includes a housing (12) defining a chamber and an x-ray tube mounted therein. The x-ray tube includes an envelope (16) defining an evacuated void in which an anode assembly (20) is rotatably mounted to a bearing assembly (44). The anode assembly interacts with a cathode assembly (22) for the production of x-rays. The bearing assembly includes a cooling channel (85) that is defined within the bearing assembly to direct cooling fluid, such as oil, across an inner surface (47) of the bearing housing (46). A flow director (15) is located in a fluid input port in the housing and has a fluid input aperture for connecting the flow director to the heat removal system. A cavity is defined by the housing of the flow director and two fluid output apertures are in fluid communication with each other and the fluid input opening. One of the fluid output apertures supplies cooling fluid along path A1 to the cooling channel in the bearing assembly and the other fluid output aperture supplies cooling fluid along path A2 to the chamber in the housing. The fluid director provides a desired predetermined portion of supplied fluid flow of the cooling fluid to the cooling channel and/or chamber.

摘要翻译： X射线管装置包括限定腔室的壳体（12）和安装在其中的X射线管。 X射线管包括限定抽空空腔的外壳（16），阳极组件（20）可旋转地安装在轴承组件（44）上。 阳极组件与用于产生X射线的阴极组件（22）相互作用。 轴承组件包括限定在轴承组件内的冷却通道（85），以将诸如油的冷却流体引导穿过轴承壳体（46）的内表面（47）。 导流器（15）位于壳体中的流体输入端口中，并且具有用于将导流器连接到散热系统的流体输入孔。 空腔由导流器的壳体限定，并且两个流体输出孔彼此流体连通和流体输入开口。 流体输出孔之一将沿着路径A1的冷却流体提供给轴承组件中的冷却通道，而另一个流体输出孔将沿着路径A2的冷却流体供应到壳体中的室。 流体导向器将冷却流体的所提供的流体流的期望预定部分提供给冷却通道和/或腔室。

公开(公告)号：EP0737867B1

公开(公告)日：2001-11-07

申请号：EP96301853.6

申请日：1996-03-19

申请人： Marconi Medical Systems, Inc.

发明人： Richard, Mark A. ,  Morich, Michael A. ,  Petropoulos, Labros S.

IPC分类号： G01R33/3873

CPC分类号： G01R33/3873 ,  G01R33/4215 ,  G01R33/422

公开(公告)号：EP0695950B1

公开(公告)日：2001-11-07

申请号：EP95304758.6

申请日：1995-07-07

申请人： Marconi Medical Systems, Inc.

发明人： Morich, Michael A. ,  Petropoulos, Labros ,  Lampman, David A.

IPC分类号： G01R33/385

CPC分类号： G01R33/385

公开(公告)号：EP1128188A2

公开(公告)日：2001-08-29

申请号：EP01301564.9

申请日：2001-02-21

申请人： Marconi Medical Systems, Inc.

发明人： Fujita, Hiroyuki ,  Demeester, Gordon D. ,  Braum, William O.

IPC分类号： G01R33/34

CPC分类号： G01R33/34046

摘要： A tunable radio frequency birdcage coil (30) is oriented vertically in a bore-type magnetic resonance apparatus. The birdcage coil (30) includes a pair of end rings (60, 62) disposed in parallel planes along a coil axis which is orthogonal to the main magnetic field. A plurality of rungs (64) electrically interconnect the end rings (60, 62) to form a generally cylindrical volume. The end rings (60, 62) and rungs (64) are mounted on a hinged (68) dielectric former (66). Conductive connectors (70) releasably fasten the end rings (60, 62) so that the coil (30) may be opened and closed to receive a portion of a subject to be examined. A conductive loop (80) is inductively coupled and positioned parallel to the end rings (60, 62). The conductive loop (80) is slidably adjustable along the coil axis for matching and tuning end-ring modes of the coil. The coil is oriented to provide a subject disposed therein with an open view for fMRI applications. Means for stimulating the visual senses (100) is mounted adjacent the examination region (14) to facilitate fMRI applications.

摘要翻译： 可调谐射频鸟笼线圈（30）在孔型磁共振装置中垂直取向。 鸟笼线圈（30）包括沿着与主磁场正交的线圈轴设置在平行平面中的一对端环（60,62）。 多个梯级（64）电连接端环（60,62）以形成大致圆柱形的体积。 端环（60,62）和梯级（64）安装在铰接（68）电介质成形器（66）上。 导电连接器（70）可释放地紧固端环（60,62），使得线圈（30）可以被打开和关闭以接收待检查对象的一部分。 导电回路（80）感应耦合并平行于端环（60,62）定位。 导电回路（80）可沿着线圈轴线可滑动地调节，用于匹配和调谐线圈的端环模式。 线圈被定向成提供设置在其中的用于fMRI应用的开放视野的对象。 用于刺激视觉感测的装置（100）安装在检查区域（14）附近，以便于fMRI应用。

公开(公告)号：EP1113286A2

公开(公告)日：2001-07-04

申请号：EP00311406.3

申请日：2000-12-19

申请人： Marconi Medical Systems, Inc.

发明人： Fujita, Hiroyuki ,  Demeester, Gordon D.

IPC分类号： G01R33/34 ,  G01R33/341

CPC分类号： G01R33/3678 ,  G01R33/34046

摘要： A quadrature RF coil assembly (50) is employed for quadrature excitation and/or reception in an open or vertical field magnetic resonance apparatus. The quadrature RF coil (50) includes a plurality of parallel rung elements (70, 72, 74, 76, 78) . A pair of electrical conductive end segments (80, 82) connect the plurality of rung elements. Capacitive elements (C V , C A ) interrupt a central rung element and the end segments. Preferably, the capacitive elements (C V , C A ) are arranged in a high-pass configuration such that the two highest resonant modes, an odd mode (90) and an even mode (92) , are tuned to have peak responsivity to a common imaging frequency. The odd mode (90) is responsive to magnetic fields which are normal to the coil (50) , while the even mode is responsive to magnetic fields which are parallel to the coil (50) and perpendicular to the main magnetic field. In one embodiment, the quadrature coil (50) is curved such that it is partially wrapped around a portion of a subject (100) with the rung elements (70, 72, 74, 76, 78) of the coil (50) parallel to the main magnetic field B 0 . The quadrature coil (50) provides improved B 1 field uniformity and greater tuning stability due to reduced localized electric field effects. The coil (50) provides greater accessibility for interventional procedures conducted in a vertical field or open magnetic resonance imaging system.

摘要翻译： 正交RF线圈组件（50）用于开放或垂直场磁共振设备中​​的正交激励和/或接收。 正交RF线圈（50）包括多个平行梯级元件（70,72,74,76,78）。 一对导电端部段（80,82）连接多个梯级元件。 电容元件（CV，CA）中断中央梯级元件和端段。 优选地，电容元件（CV，CA）被布置成高通配置，使得将两个最高谐振模式（奇模式（90）和偶模式（92））调谐为对共同成像具有峰值响应性 频率。 奇数模式（90）响应于垂直于线圈（50）的磁场，而偶模式响应于平行于线圈（50）并垂直于主磁场的磁场。 在一个实施例中，正交线圈（50）是弯曲的，使得它被部分缠绕在被检体（100）的一部分上，线圈（50）的梯级元件（70,72,74,76,78）平行于 主磁场B0。 正交线圈（50）由于减小的局部电场效应而提供改进的B1场均匀性和更大的调谐稳定性。 线圈（5​​0）为在垂直场或开放磁共振成像系统中进行的介入程序提供更大的可接近性。