公开(公告)号：US20030053669A1

公开(公告)日：2003-03-20

申请号：US09907779

申请日：2001-07-18

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Jasjit S. Suri ,  Kecheng Liu

IPC分类号： G06K009/00

CPC分类号： G06T7/0012 ,  A61F7/12 ,  A61F2007/126 ,  G01R33/563 ,  G06T7/12 ,  G06T7/155 ,  G06T2207/10088 ,  G06T2207/30104

摘要： In magnetic resonance angiography (MRA), the MRA data (40) is smoothed and converted into an isotropic format (52). A binary surface fitting mask (56) that differentiates vascular regions from surrounding tissue is generated from the isotropic MRA data. Vascular starting points (60) are identified based on the binary surface fitting mask. The vascular system corresponding to each starting point is tracked (62). The tracked vascular system is graphically displayed (68). Preferably, the arteries and the veins in the binary surface fitting mask data are differentiated (58) based on anatomical constraints. The tracking (62) preferably includes estimating an oblique plane that is orthogonal to the vessel (204), determining the vessel edges in the oblique plane (212), and determining an estimated vessel center in the oblique plane (216). The vessel edges are preferably determined by determining a raw vessel edge (208), and refining the raw vessel edge to obtain a refined vessel edge representation (212).

摘要翻译： 在磁共振血管造影（MRA）中，MRA数据（40）被平滑化并转换为各向同性格式（52）。 从各向同性MRA数据生成区分血管区域与周围组织的二元表面拟合掩模（56）。 基于二元表面拟合掩模识别血管起始点（60）。 跟踪每个出发点的血管系统（62）。 跟踪的血管系统图形显示（68）。 优选地，基于解剖学约束，二进制表面拟合掩模数据中的动脉和静脉是不同的（58）。 跟踪（62）优选地包括估计与血管（204）正交的倾斜平面，确定倾斜平面（212）中的血管边缘，以及确定倾斜平面（216）中的估计血管中心。 容器边缘优选通过确定原始血管边缘（208）并精炼原始血管边缘以获得精细血管边缘表示（212）来确定。

公开(公告)号：US20030036694A1

公开(公告)日：2003-02-20

申请号：US09932551

申请日：2001-08-16

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Kecheng Liu

IPC分类号： A61B005/05

CPC分类号： A61B6/541 ,  A61B5/055 ,  A61B5/7292 ,  A61B6/507 ,  G01R33/281 ,  G01R33/563 ,  G06F19/00 ,  Y10S128/92

摘要： A parameter compilation memory (62, 114) stores patient physiological information and contrast agent arrival or uptake times (tD, tA, tV) from past patients. A triggering or synchronizing window processor (64, 112) sets a triggering window, i.e. estimates the arrival time, based on the past patient information. A subject (16) disposed within an imaging region (12, 90) is injected with a contrast agent (66). Arrival of the contrast agent in the imaging region is detected (72, 110) with a real time tracking method. Diagnostic imaging is commenced on the first to occur of the detection of contrast agent arrival within the window and the end of the triggering window. The uptake times for the subject (16) are compared to those stored in the memory (62, 114) and analyzed to propose a diagnosis.

摘要翻译： 参数编译存储器（62,114）存储来自患者的患者生理信息和造影剂到达或摄取时间（tD，tA，tV）。 触发或同步窗口处理器（64,112）基于过去的患者信息设置触发窗口，即估计到达时间。 设置在成像区域（12,90）内的受试者（16）注射造影剂（66）。 通过实时跟踪方法检测成像区域中造影剂的到达（72,110）。 首先开始进行诊断成像，以检测造影剂到达窗口和触发窗口的结束。 将对象（16）的摄取时间与存储在存储器（62,114）中的摄取时间进行比较并进行分析以提出诊断。

公开(公告)号：US20030091148A1

公开(公告)日：2003-05-15

申请号：US09992274

申请日：2001-11-14

申请人： MARCONI MEDICAL SYSTEMS, INC

发明人： Todd Russell Bittner ,  Qing Kelvin Lu ,  Paul Mingwei Xu

IPC分类号： H01J035/10

CPC分类号： H01J35/16 ,  H01J35/101 ,  H01J2235/167 ,  H05G1/025

摘要： An x-ray tube (1) includes a heat shield (130) which intercepts heat radiating from an anode (10), thereby reducing the temperature of a bearing assembly (62). The heat shield includes outer and inner concentric cylinders (132, 134) spaced from each other by a vacuum gap (138). The heat shield and a stationary portion (114) of the bearing assembly are both connected to a cold plate (150) so that heat is not conducted from the cylinders to the bearing assembly but is instead carried away by the cold plate to the surrounding cooling oil.

摘要翻译： X射线管（1）包括阻挡从阳极（10）辐射的热量的隔热罩（130），从而降低轴承组件（62）的温度。 隔热罩包括通过真空间隙（138）彼此隔开的外部和内部同心圆筒（132,134）。 所述隔热罩和所述轴承组件的固定部分（114）都连接到冷板（150），使得热量不会从气缸传递到轴承组件，而是被冷板带走到周围的冷却 油。

公开(公告)号：US20020187711A1

公开(公告)日：2002-12-12

申请号：US09877590

申请日：2001-06-08

申请人： Marconi Medical Systems, Inc.

发明人： Allan D. Kautz ,  Salvatore G. Perno

IPC分类号： H01J009/00

CPC分类号： H01J35/06 ,  H01J9/18

摘要： An apparatus (20) for setting a filament (22) on an electrode (24) comprises a body (52) having a central member (54) with a longitudinal axis (A-A), a first end member (56) and a second end member (58). The first and second end members (56, 58) are located at opposite ends of the central member (54) and each extends away from the longitudinal axis (A-A) thereby forming a recess (59). Each end member (56, 58) includes a surface generally facing the recess (61, 63) and an outer surface (74, 76). A bore (68) in the body is adapted to receive a retaining member (not shown) for mounting the body (52) to the electrode (24). A cavity (70) extends through the first end member (56) from its outer surface (74) to its recess facing surface (61). A cavity (80) in the second end member (58) opens toward the recess (59). The cavities (70, 80) in the first end member (56) and second end member (58) are located opposite one another across the recess (59).

摘要翻译： 用于将电极（24）上的细丝（22）设置的装置（20）包括具有纵向轴线（AA）的中心构件（54）的主体（52），第一端构件（56）和第二端 会员（58）。 第一和第二端部构件（56,58）位于中心构件（54）的相对端并且各自远离纵向轴线（A-A）延伸，从而形成凹部（59）。 每个端部构件（56,58）包括大致面向凹部（61,63）的表面和外表面（74,76）。 主体中的孔（68）适于接收用于将主体（52）安装到电极（24）的保持构件（未示出）。 腔（70）从其外表面（74）延伸穿过第一端构件（56）到其面向凹面的表面（61）。 第二端构件（58）中的空腔（80）朝向凹部（59）开口。 第一端构件（56）和第二端构件（58）中的空腔（70,80）跨越凹部（59）彼此相对定位。

公开(公告)号：US20020171424A1

公开(公告)日：2002-11-21

申请号：US09813183

申请日：2001-03-20

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Michael A. Morich ,  Shmaryu M. Shvartsman

IPC分类号： G01V003/00

CPC分类号： G01R33/385 ,  G01R33/3875

摘要： A gradient coil assembly (22) generates magnetic field gradients across the main magnetic field of a magnetic resonance imaging apparatus and includes a base gradient coil set which generates magnetic field gradients which are substantially linear over a first useful imaging volume, and a correction gradient coil set which generates magnetic field gradients having substantially no first order moment. The correction gradient coil set produces third and higher order moments which combine with higher order terms of the base gradient coil set to produce magnetic field gradients which are substantially linear over a second useful imaging volume different from the first useful imaging volume. In a preferred embodiment, the second volume is continuously variable by adjusting the amounts of current applied to the base and correction coils.

摘要翻译： 梯度线圈组件（22）在磁共振成像设备的主磁场上产生磁场梯度，并且包括基本梯度线圈组，其产生在第一有用成像体积上基本上线性的磁场梯度，以及校正梯度线圈 其产生基本上没有一阶矩的磁场梯度。 校正梯度线圈组产生与基本梯度线圈组的较高阶项相组合的第三和更高阶矩，以产生在与第一有用成像体积不同的第二有用成像体积上基本上线性的磁场梯度。 在优选实施例中，通过调节施加到基座和校正线圈的电流量，第二容积可连续变化。

公开(公告)号：US20020141530A1

公开(公告)日：2002-10-03

申请号：US10045450

申请日：2001-11-07

申请人： Marconi Medical Systems, Inc.

发明人： Chris J. Vrettos ,  Marc A. Chappo ,  Anthony F. Krecic

IPC分类号： A61B006/00 ,  G21K001/12

CPC分类号： G01T1/2985 ,  A61B6/032 ,  A61B6/4233 ,  G01T1/243 ,  G01T1/247 ,  G01T1/249

摘要： A computerized tomographic imaging system including a stationary gantry portion defining an examination region and a rotating gantry portion for rotation about the examination region. An x-ray source is disposed on the rotating gantry portion for projecting x-rays through the examination region. A plurality of modular radiation detector units are disposed across the examination region from the x-ray source. Each radiation detector unit includes an array of x-ray sensitive cells for receiving radiation from the x-ray source after it has passed through the examination region and for generating an analog signal indicative of the radiation received thereby. Each radiation detector unit also includes a plurality of integrated circuits connected to the x-ray sensitive cells with each integrated circuit including a plurality of channels. Each channel receives the analog signal from an x-ray sensitive cell and generates digital data indicative of the value of the analog signal.

摘要翻译： 一种计算机断层成像系统，包括限定检查区域的固定台架部分和用于围绕检查区域旋转的旋转台​​架部分。 X射线源设置在旋转台架部分上，用于通过检查区域投射x射线。 多个模块化辐射检测器单元跨越X射线源的检查区域设置。 每个辐射检测器单元包括一组X射线敏感细胞，用于在X射线源通过检查区域之后接收来自X射线源的辐射，并产生指示由其接收的辐射的模拟信号。 每个辐射检测器单元还包括连接到x射线敏感单元的多个集成电路，每个集成电路包括多个通道。 每个通道从X射线敏感单元接收模拟信号，并产生指示模拟信号值的数字数据。

公开(公告)号：US20020126798A1

公开(公告)日：2002-09-12

申请号：US09802517

申请日：2001-03-09

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Jason P. Harris ,  Salvatore Perno

IPC分类号： H01J035/06

CPC分类号： H01J35/06 ,  H01J2235/068

摘要： A dual filament x-ray tube assembly (16) includes an evacuated envelope (52) having an anode (54) disposed at a first end of the evacuated envelope (52) and a cathode assembly (62) disposed at a second end of the evacuated envelope (52). The cathode assembly includes a variable-length filament assembly (72, 74; 100) which emits electron beams for impingement on the anode (54) at focal spots having varying lengths. The cathode assembly (62) further includes a cathode cup (64, 66, 68; 110, 112) which is subdivided into a plurality of electrically insulated deflection electrodes (64, 66, 68; 110, 112). A filament select circuit (80) selectively and individually heats a portion of the variable-length filament assembly (72, 74). Electron beams emitted from the filament assembly (72, 74) are electrostatically focused and controlled by applying potentials to different ones of the deflection electrodes (64, 66, 68; 110, 112). The x-ray tube assembly (16) provides longer focal spots for thick-slice scanning applications and shorter focal spots for thin-slice scanning applications along with the benefit of electrostatic focusing and control.

摘要翻译： 双丝X射线管组件（16）包括抽真空的外壳（52），其具有设置在所述真空外壳（52）的第一端的阳极（54）和设置在所述真空外壳的第二端处的阴极组件 抽空信封（52）。 阴极组件包括可变长度的灯丝组件（72,74; 100），其在具有不同长度的焦点处发射用于在阳极（54）上冲击的电子束。 阴极组件（62）还包括阴极杯（64,66,68,110,112），其被细分为多个电绝缘的偏转电极（64,66,68; 110,112）。 灯丝选择电路（80）选择性地且单独加热可变长度灯丝组件（72,74）的一部分。 从灯丝组件（72,74）发射的电子束通过向不同的偏转电极（64,66,68,110,112）施加电位来静电聚焦和控制。 X射线管组件（16）为薄片扫描应用提供了更长的焦点，并为薄片扫描应用提供了较短的焦斑，同时还具有静电聚焦和控制的优点。

公开(公告)号：US20040073109A1

公开(公告)日：2004-04-15

申请号：US09782331

申请日：2001-02-13

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： William G. Hawkins

IPC分类号： A61B006/00

CPC分类号： G06T11/005 ,  G06T2211/436

摘要： A nuclear camera (10) includes a plurality of detector heads (12) which have collimators (14) for fixing the trajectory along which radiation is receivable. A rotating gantry (22) rotates the detector heads around the subject collecting less than 360null of data, e.g., 204null of data. A zero-filling processor (50) generates zero-filled projection views such that the actually collected projection views and the zero-filled projection views span 360null. A smoothing processor (56) smooths an interface between the zero-filled and actually collected projection views. The zero-tilled and smoothed views are Fourier transformed (60) into frequency space, filtered with a stationary deconvolution function (62), and Fourier transformed (64) back into real space. The resolution recovered projection data sets in real space are reconstructed by a reconstruction processor (68) into a three-dimensional image representation for storage in an image memory (70).

摘要翻译： 核相机（10）包括多个检测器头（12），其具有用于固定可接收辐射的轨迹的准直器（14）。 旋转台架（22）使检测器头围绕收集小于360°数据的对象旋转，例如204°的数据。 零填充处理器（50）产生零填充投影视图，使得实际收集的投影视图和零填充投影视图跨越360°。 平滑处理器（56）平滑零填充和实际收集的投影视图之间的界面。 零倾斜和平滑的视图被傅里叶变换（60）到频率空间中，用静态去卷积函数（62）滤波，并且傅立叶变换（64）回到真实空间中。 在实际空间中恢复的投影数据组由重构处理器（68）重建为三维图像表示以存储在图像存储器（70）中。

公开(公告)号：US20030166999A1

公开(公告)日：2003-09-04

申请号：US09908009

申请日：2001-07-18

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Kecheng Liu ,  Jasjit S. Suri

IPC分类号： A61B005/05

CPC分类号： G01R33/56 ,  G01R33/563 ,  G06T7/0012 ,  G06T7/12 ,  G06T7/149 ,  G06T7/155 ,  G06T2207/10088 ,  G06T2207/30104

摘要： A magnetic resonance angiographic method includes acquiring (70) high resolution volume image data comprising data (74) corresponding to a plurality of high resolution image slices, and acquiring (72) data corresponding to at least one vessel identification image slice (76), said acquired data having selectively enhanced contrast for one of arteries and veins. A high resolution volume image representation (80) is reconstructed from the acquired high resolution volume image data (74). At least one vessel identification slice image representation (82) is reconstructed from the acquired data corresponding to at least one vessel identification image slice (76). At least one of an artery starting point (86) and a vein starting point (88) is identified based on the vessel identification slice image representation (82). Preferably, the method further includes defining (124) an initial surface that encloses the at least one starting point (126), and iteratively growing (128) the initial surface (126) until the surface essentially coincides with the boundaries of the vascular system.

摘要翻译： 磁共振血管造影方法包括获取（70）包括对应于多个高分辨率图像切片的数据（74）的高分辨率体积图像数据，以及获取对应于至少一个血管识别图像切片（76）的数据（72），所述数据 获得的数据具有选择性地增强动脉和静脉之一的对比度。 从所获取的高分辨率体积图像数据（74）重建高分辨率体积图像表示（80）。 从对应于至少一个血管识别图像切片（76）的所获取的数据重建至少一个血管识别切片图像表示（82）。 基于血管识别切片图像表示（82）识别动脉起点（86）和静脉起始点（88）中的至少一个。 优选地，该方法还包括限定（124）封闭至少一个起始点（126）的初始表面，并迭代地生长（128）初始表面（126）直到该表面基本上与血管系统的边界重合。

公开(公告)号：US20020107438A1

公开(公告)日：2002-08-08

申请号：US09776964

申请日：2001-02-05

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Kecheng Liu ,  Jasjit S. Suri ,  Thomas S. Cull

IPC分类号： A61B005/05

CPC分类号： G01R33/5601 ,  A61B5/0456 ,  A61B5/055 ,  G01R33/56308

摘要： A magnetic resonance imaging method includes acquiring a baseline magnetic resonance image of a region of interest in the absence of a contrast agent and simulating an increase in image intensity of a subregion of interest within the region of interest which is subject to increased image intensity in the presence of a contrast agent. The magnetic resonance k-space signal intensity is correlated with contrast agent concentration in the subregion and a contrast agent is administered to the subject. As k-space data for the region of interest is acquired, the signal intensity is monitored to derive contrast agent concentration information. When the peak contrast agent concentration is detected from the monitored k-space data signal intensity, the phase encoding is adjusted so that k-space data with zero phase encoding is acquired. In a further aspect, a magnetic resonance imaging apparatus is also provided.

摘要翻译： 磁共振成像方法包括：在不存在造影剂的情况下获取感兴趣区域的基线磁共振图像，并且模拟感兴趣区域中图像强度的图像强度的增加，所述感兴趣区域在 存在造影剂。 磁共振k空间信号强度与该次区域中的造影剂浓度相关，并且向对象施用造影剂。 当获取感兴趣区域的k空间数据时，监视信号强度以导出造影剂浓度信息。 当从监测的k空间数据信号强度检测到峰值造影剂浓度时，调整相位编码，从而获得具有零相位编码的k空间数据。 另一方面，还提供了磁共振成像装置。