公开(公告)号：EP1132942A2

公开(公告)日：2001-09-12

申请号：EP01302075.5

申请日：2001-03-07

申请人： Marconi Medical Systems, Inc.

发明人： Kuzniar, Daniel E. ,  Miller, Lester D. ,  Carlson, Gerald J.

IPC分类号： H01J35/10

CPC分类号： H01J35/101

摘要： An x-ray tube (20) includes an evacuated envelope (26). Mounted within the evacuated envelope are a cathode (23) and a rotatably supported anode (30). A rotor (70) is included for rotatably driving the anode. The rotor (70) is electrically insulated from the anode (30) by a disk (76) comprised of an insulating material.

摘要翻译： X射线管（20）包括抽真空的外壳（26）。 安装在真空外壳内的是阴极（23）和可旋转地支撑的阳极（30）。 包括用于可旋转地驱动阳极的转子（70）。 转子（70）通过由绝缘材料构成的盘（76）与阳极（30）电绝缘。

公开(公告)号：EP0933652A3

公开(公告)日：2001-08-22

申请号：EP99300676.6

申请日：1999-01-29

申请人： Marconi Medical Systems, Inc.

发明人： Difilippo, Frank P.

IPC分类号： G01T1/29 ,  G01T1/164

CPC分类号： G01T1/2985 ,  A61B6/037

摘要： An imaging apparatus includes a plurality of detector assemblies 32a-c disposed for rotation about an imaging region. The detector assemblies may be adjusted between at least two relative angular orientations about the imaging region. The relative angular orientations are selected based on the size of an object 16 within the imaging region. The centre of the transverse fields of view of the detectors may be offset from the axis of rotation. Gamma radiation generated by positron annihilation events is detected and used to generate tomographic images.

摘要翻译： 成像设备包括被设置用于围绕成像区域旋转的多个检测器组件32a-c。 检测器组件可以在围绕成像区域的至少两个相对角度取向之间进行调整。 基于成像区域内的对象16的大小来选择相对角度取向。 检测器的横向视场的中心可以偏离旋转轴线。 由正电子湮灭事件产生的伽玛辐射被检测并被用于产生层析图像。

公开(公告)号：EP1124249A2

公开(公告)日：2001-08-16

申请号：EP01300404.9

申请日：2001-01-18

申请人： Marconi Medical Systems, Inc.

发明人： Wandke, Norman E. ,  Maska, Mark S. ,  Mueller, Donald C.

IPC分类号： H01J35/10

CPC分类号： F16C37/007 ,  H01J35/101 ,  H01J2235/1046 ,  H01J2235/1208

摘要： A high energy x-ray tube includes an evacuated chamber (12) containing a rotor (34) which rotates an anode (10) in the path of a stream of electrons (A) to generate an x-rays (B) and heat. The rotor includes a bearing shaft (54, 80, 122) connected to the anode by a thermally conductive structure (40) . The bearing shaft carries soft metal-lubricated bearing balls (44F, 44R) in forward and rear bearing races (64, 66, 106, 108, 128, 130) . An annular groove (70, 94, 132) is defined longitudinally in the shaft which, particularly when evacuated, provides a thermal barrier between the forward race and the portion of the shaft that is thermally connected with the anode. The groove lengthens the path heat entering the bearing shaft travels in order to reach the forward bearing race. As a result, the temperature of the forward race, and hence the evaporation of lubricant during operation of the x-ray tube, is reduced. The groove may be formed by electrical discharge machining the bearing shaft or by forming the shaft from inner and peripheral components (124, 126) which are connected together adjacent the rear bearing race (130) .

摘要翻译： 高能量X射线管包括：真空室（12），其包含转子（34），该转子使电子（A）的路径中的阳极（10）旋转以产生X射线（B）和热量。 转子包括通过导热结构（40）连接到阳极的轴承轴（54,80，122）。 轴承轴在前后轴承座（64,66,106,108,128,130）中承载软金属润滑轴承滚珠（44F，44R）。 在轴中纵向地限定环形槽（70,94,132），特别是在抽空时，在前轮与轴的与阳极热连接的部分之间提供热障。 凹槽延长进入轴承轴的路径，以便到达正向轴承座。 结果，减少了正面跑道的温度，并因此降低了在X射线管操作期间润滑剂的蒸发。 凹槽可以通过对轴承轴进行放电加工或者通过相邻于后轴承座圈（130）连接在一起的内部和外围部件（124,126）形成轴而形成。

公开(公告)号：EP0938249A3

公开(公告)日：2001-08-16

申请号：EP99301198.0

申请日：1999-02-18

申请人： Marconi Medical Systems, Inc.

发明人： Panasik, Cheryl L.

IPC分类号： H05G1/02 ,  H01J35/10 ,  H05G1/04

CPC分类号： H05G1/04 ,  H05G1/025

摘要： An x-ray tube includes an envelope (16) defining an evacuated chamber (29) in which an anode assembly (20) is rotatably mounted to a bearing assembly (44) and interacts with a cathode assembly (22) for production of x-rays. The bearing assembly includes a bearing housing and a plurality of bearings disposed on an outer surface of the bearing housing. A cooling channel is defined within the bearing assembly and directs cooling fluid such as oil across an inner surface of the bearing housing. As the cooling fluid flows adjacent the inner surface of the bearing housing, heat from the bearing housing is absorbed by the cooling fluid thereby reducing the heat transferred to the bearings.

公开(公告)号：EP0955554A3

公开(公告)日：2001-07-18

申请号：EP99303544.3

申请日：1999-05-06

申请人： Marconi Medical Systems, Inc.

发明人： Burl, Michael ,  Morich, Michael

IPC分类号： G01R33/36 ,  G01R33/28

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.

公开(公告)号：EP1113285A2

公开(公告)日：2001-07-04

申请号：EP00311402.2

申请日：2000-12-19

申请人： Marconi Medical Systems, Inc.

发明人： Fujita, Hiroyuki ,  Demeester, Gordon D. ,  Morich, Michael A.

IPC分类号： G01R33/34

CPC分类号： G01R33/3415 ,  G01R33/34 ,  G01R33/34061

摘要： A crossed-ladder RF coil assembly ( 48 ) is employed for quadrature excitation and/or reception in an open or vertical field magnetic resonance apparatus. The RF coil assembly ( 48, 70, 90 ) includes a pair of coil assemblies ( 50, 52; 70, 72; 100, 102 ) which are disposed in a parallel relationship. Coil arrays ( 50, 52; 100, 102 ) include at least two ladder RF coils ( 50 1 , 50 2 , 50 3 ; 52 1 , 52 2 , 52 3 ; 100 1 ..., 100 8 ; 102 1 ,..., 102 8 ) which are disposed in an overlapping relationship and are rotated by 90° relative to one another. Each ladder RF coil of one coil array is rotated by 90° relative to adjoining ladder coils and each corresponding ladder RF coil of the other coil array. The crossed-ladder RF coil assembly ( 48 ) provides better B 1 field uniformity and elongated anatomical coverage for spine and neck imaging. In addition, the RF coil assembly reduces noise from the body at higher fields in vertical field magnetic resonance systems.

摘要翻译： 甲交叉梯子RF线圈组件（48）被用于正交激励和/或接收在开放或垂直场磁共振装置。 的RF线圈组件（48，70，90）包括一对线圈组件（50，52; 70，72; 100，102），它们是在一个平行关系地设置。 线圈阵列（50，52; 100，102）包括至少两个阶梯的RF线圈（501，502，503; 1021，...，1028; 521，522，523 1001 ...，1008），它们是在位于 以重叠关系，并通过90°相转动到彼此。 一个线圈阵列的每个梯RF线圈由相对90°到邻接的梯子线圈和另一线圈阵列的每个相应的梯RF线圈旋转。 叉的梯子RF线圈组件（48）提供了更好的B1场的均匀性和长形解剖覆盖脊柱和颈部成像。 此外，RF线圈组件在垂直场磁共振系统更高字段减少了从身体噪声。

公开(公告)号：EP1099961A2

公开(公告)日：2001-05-16

申请号：EP00309892.8

申请日：2000-11-07

申请人： Marconi Medical Systems, Inc.

发明人： Gagnon, Daniel ,  Brack, Jerome W.

IPC分类号： G01T1/29

CPC分类号： G01T1/1647

摘要： A method for reconstructing an image representation of a subject from data sets collected using a medical imaging apparatus is provided. The method includes defining operations which are performed in reconstructing desired types of image representations. The operations are applicable to data sets having particular formats. Data sets having particular formats are identified, and operations are selected (250) from the defined operations based upon the particular format of the identified data sets. When a detected load on available image processing equipment is below a desired level (220) , then selected operations are automatically performed on the identified data sets.

摘要翻译： 提供了一种用于使用医学成像装置收集的数据集重建对象的图像表示的方法。 该方法包括定义在重建期望类型的图像表示中执行的操作。 这些操作适用于具有特定格式的数据集。 识别具有特定格式的数据集，并且基于所识别的数据集的特定格式从所定义的操作中选择（250）操作。 当检测到的可用图像处理设备的负载低于期望的水平（220）时，对所识别的数据集进行自动执行所选择的操作。

公开(公告)号：EP0949512A3

公开(公告)日：2001-05-16

申请号：EP99302380.3

申请日：1999-03-26

申请人： Marconi Medical Systems, Inc.

发明人： Steckner, Michael

IPC分类号： G01R33/3875 ,  G01R33/565

CPC分类号： G01R33/3875

摘要： Apparatus for and a method for shimming main magnetic field in a magnetic resonance imaging apparatus is provided. A radio frequency pulse sequence (200) is generated while a subject is in an examination region (14) of the magnetic resonance imaging apparatus. A reference signal (EC1) which is immune to shim errors is then acquired. Thereafter, a field echo (EC3a) signal is acquired which is sensitive to shim errors. The field echo (EC3a) signal is acquired at a timed interval (T) equal to a multiple of an amount of time it takes for fat and water signals to become in phase. The temporal position of the maximum of the field echo signal is compared to its predicted temporal position (EC3) relative to the reference signal (EC1) . The shim term is calculated based on the preceding comparison and an electrical current is applied to one of a gradient offset and a shim coil such that the main magnetic field is adjusted according to the shim term.

公开(公告)号：EP0927890A3

公开(公告)日：2001-05-02

申请号：EP98310706.1

申请日：1998-12-23

申请人： Marconi Medical Systems, Inc.

发明人： Petropoulos, Labros ,  Ling, Junxiao

IPC分类号： G01R33/385 ,  G01R33/421

CPC分类号： G01R33/4215 ,  G01R33/385

摘要： A method of designing a shielded gradient coil assemblies for magnetic resonance imaging systems is provided. The method includes generating a first continuous current distribution for a primary coil (60) using an inverse approach. The first continuous current distribution is confined within predetermined finite geometric boundaries of a surface defined by two dimensions and generates a magnetic gradient field across an imaging region (14). The magnetic gradient field constrained to predetermined values at specified spatial locations within the imaging region (14). The current distribution and magnetic field are converted into a stored energy and magnetic field domain where a finite element analysis is performed to generate a second continuous current distribution for a shielding coil (62). The second continuous current distribution is confined within predetermined finite geometric boundaries of a surface surrounding the primary coil (60). The second continuous current distribution generates a magnetic field which substantially cancels in an area outside a region defined by the shielding coil a fringe magnetic field generated by the first continuous current density.

公开(公告)号：EP1087235A1

公开(公告)日：2001-03-28

申请号：EP00308012.4

申请日：2000-09-14

申请人： Marconi Medical Systems, Inc.

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

IPC分类号： G01R33/563

CPC分类号： G01R33/563 ,  G01R33/5608 ,  G01R33/5617

摘要： A black blood magnetic resonance angiogram is produced by exciting dipoles and repeatedly inverting the resonance to produce a series of magnetic resonance echoes. Early echoes are more heavily proton density weighted than later echoes, which are more heavily T2 weighted. The magnetic resonance echoes are received and demodulated into a series of data lines. The data lines are sorted between the more heavily proton density weighted data lines and T2 weighted data lines which are reconstructed into a proton density weighted image representation and a T2 weighted image representation. The proton density weighted and T2 weighted image representations are combined (90) to emphasize the black blood from the T2 weighted images and the static tissue from the proton density weighted image. The combination processor (90) scales (92) the PDW and T2W images to a common maximum intensity level. The PDW and T2W image representations are then combined, e.g. averaged, together (94) to form a combined or averaged image. An edge image (96) is computed from the T2W image and a threshold mask (98) is applied. The edge image (96) is combined (100) with the combined image (94) to form an edge enhanced image. Optionally, a minimum projection intensity algorithm (102) is applied to the enhanced image. Preferably, the enhanced image is a black blood magnetic resonance angiogram with emphasized blood vessel edges.

摘要翻译： 黑色血液磁共振血管造影片是通过激励偶极子并反复反转共振产生一系列磁共振回波产生的。 早期回声质子密度加权比后期回声更重，后者更重的是T2加权。 磁共振回波被接收并解调为一系列数据线。 数据线在更重的质子密度加权数据线和T2加权数据线之间被分类，其被重建为质子密度加权图像表示和T2加权图像表示。 将质子密度加权和T2加权图像表示组合（90）以强调来自T2加权图像的黑血和来自质子密度加权图像的静态组织。 组合处理器（90）将PDW和T2W图像缩放（92）到共同的最大强度水平。 然后组合PDW和T2W图像表示，例如， 平均一起（94）以形成组合或平均图像。 从T2W图像计算边缘图像（96）并应用阈值掩模（98）。 边缘图像（96）与组合图像（94）组合（100）以形成边缘增强图像。 可选地，最小投影强度算法（102）被应用于增强图像。 优选地，增强图像是具有强调的血管边缘的黑色血液磁共振血管造影照片。