Cone-beam CT scanner with image reconstruction using multiple sub-images
    52.
    发明授权
    Cone-beam CT scanner with image reconstruction using multiple sub-images 有权
    锥形CT扫描仪,使用多个子图像进行图像重建

    公开(公告)号:US06678346B2

    公开(公告)日:2004-01-13

    申请号:US09975543

    申请日:2001-10-11

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: A computed tomography imaging system includes a source of a conical beam of radiation and a two-dimensional detector array arranged on opposite sides of an axis of rotation. Projection data is acquired in a conventional manner as the source and detector array make a full rotation about an object. A conventional half-scan image reconstruction algorithm is applied to the projection data at a plurality of different center-view angles to produce a plurality of sub-images. Image segments, which are centered in each sub-image along the axis of the respective center-view angle, are selected and combined to form a cross-sectional image of the object. The regions of each sub-image preferably are defined by a weighting function.

    摘要翻译: 计算机断层成像系统包括锥形辐射束源和布置在旋转轴线的相对侧上的二维检测器阵列。 当源和检测器阵列绕对象完全旋转时,以常规方式获取投影数据。 传统的半扫描图像重建算法以多个不同的中心视角应用于投影数据,以产生多个子图像。 沿着相应中心视角的轴线在每个子图像中居中的图像片段被选择并组合以形成对象的横截面图像。 每个子图像的区域优选地由加权函数定义。

    Methods and apparatus for weighting projection data
    53.
    发明授权
    Methods and apparatus for weighting projection data 有权
    用于加权投影数据的方法和装置

    公开(公告)号:US06654442B2

    公开(公告)日:2003-11-25

    申请号:US10113532

    申请日:2002-03-29

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    CPC分类号: G06T11/005 A61B6/027

    摘要: A method for weighting projection data includes selecting a region that includes a plurality of projection data samples, dividing the region into a plurality of equally sized sub-regions, and weighting the equally sized sub-regions using a location dependent z-smoothing weighting function.

    摘要翻译: 一种用于对投影数据进行加权的方法包括:选择包括多个投影数据样本的区域,将该区域划分成多个相同尺寸的子区域,以及使用位置相关的z-平滑加权函数对相同大小的子区域进行加权。

    Methods and apparatus for multi-slice image reconstruction
    54.
    发明授权
    Methods and apparatus for multi-slice image reconstruction 有权
    多层图像重建方法与装置

    公开(公告)号:US06587537B1

    公开(公告)日:2003-07-01

    申请号:US10113069

    申请日:2002-04-01

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: A method for generating an adaptively interpolated projection of an object with an imaging system includes generating a first projection using a first interpolation kernel, generating a second projection using a second interpolation kernel, different from the first interpolation kernel, and taking a difference between the first projection and the second projection to generate a differential signal.

    摘要翻译: 用成像系统产生物体的自适应内插投影的方法包括使用第一内插核生成第一投影,使用不同于第一插值内核的第二内插核生成第二投影,并且取第一内插核之间的差 投影和第二投影以产生差分信号。

    Computer aided acquisition of medical images
    55.
    发明授权
    Computer aided acquisition of medical images 有权
    计算机辅助获取医学图像

    公开(公告)号:US06574304B1

    公开(公告)日:2003-06-03

    申请号:US10242975

    申请日:2002-09-13

    IPC分类号: A61B600

    摘要: The invention provides a technique for acquiring subsequent image data in a medical diagnostic context based upon analysis of initial image data. The initial image data is processed via a computer aided diagnosis algorithm to determine whether additional image data acquisition is appropriate. Subsequent acquisition processes may be performed on the same imaging system from which the initial image data originated, or a different imaging system. The imaging systems may also be of different modalities. The subsequent acquisition of image data may be performed automatically without operator intervention, or the prescribed subsequent acquisition sequence may be outputted by the system for execution upon command of an operator.

    摘要翻译: 本发明提供一种基于初始图像数据的分析在医疗诊断上下文中获取后续图像数据的技术。 通过计算机辅助诊断算法处理初始图像数据,以确定附加图像数据采集是否合适。 随后的采集过程可以在与其起始的图像数据相同的成像系统或不同的成像系统上执行。 成像系统也可以是不同的模式。 图像数据的后续采集可以在没有操作者干预的情况下自动执行,或者可以由系统输出规定的后续采集序列,以便在操作者的命令下执行。

    Adaptive projection filtering scheme for noise reduction
    56.
    发明授权
    Adaptive projection filtering scheme for noise reduction 有权
    用于降噪的自适应投影滤波方案

    公开(公告)号:US06529575B1

    公开(公告)日:2003-03-04

    申请号:US10063485

    申请日:2002-04-29

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B600

    摘要: A method and system for reducing noise in an x-ray image generated by an imaging system using an adaptive projection filtering scheme including generating system information, obtaining original projection data, determining a data characteristic of the original projection data, processing the original projection data responsive to the system information and the data characteristic so as to create filtered projection data and calculating resulting projection data responsive to the filtered projection data. Also claimed is a medium encoded with a machine-readable computer program code for reducing noise in an x-ray image generated by an imaging system, the medium including instructions for causing controller to implement the aforementioned method.

    摘要翻译: 一种用于降低由成像系统产生的X射线图像中的噪声的方法和系统,该自适应投影滤波方案包括生成系统信息,获得原始投影数据,确定原始投影数据的数据特征,响应于处理原始投影数据 与系统信息和数据特性相关联,以便产生经滤波的投影数据并且响应于经滤波的投影数据计算产生的投影数据。 还要求保护的是用机器可读计算机程序代码编码的介质,用于降低由成像系统产生的x射线图像中的噪声,该介质包括用于使控制器实现上述方法的指令。

    Method and apparatus for noise reduction in computed tomographic systems
    57.
    发明授权
    Method and apparatus for noise reduction in computed tomographic systems 有权
    计算机断层摄影系统降噪的方法和装置

    公开(公告)号:US06493416B1

    公开(公告)日:2002-12-10

    申请号:US09990016

    申请日:2001-11-21

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: A method for facilitating a reduction in reconstructed image noise in a computed tomography imaging system. The method includes generating projection data, characterizing a noise distribution of the projection data, performing an adaptive noise reduction operation on the projection data using the noise distribution characterization, and filtering the projection data.

    摘要翻译: 一种用于在计算机断层成像系统中有助于减少重建图像噪声的方法。 该方法包括产生投影数据,表征投影数据的噪声分布,使用噪声分布表征对投影数据执行自适应降噪操作,以及对投影数据进行滤波。

    Methods and apparatus for tilted helical image reconstruction in CT imaging
    58.
    发明授权
    Methods and apparatus for tilted helical image reconstruction in CT imaging 有权
    CT成像中倾斜螺旋图像重建的方法和装置

    公开(公告)号:US06463117B1

    公开(公告)日:2002-10-08

    申请号:US09718916

    申请日:2000-11-22

    申请人: Jiang Hsieh

    发明人: Jiang Hsieh

    IPC分类号: A61B603

    摘要: To reduce the computational load in comparison to the iso-center shift described above, instead of selecting the z-axis of the coordinate system as the iso-center for reconstruction, the gantry iso-center of one of the detector rows (e.g., one of the center rows) is selected as the reconstruction iso-center. In this arrangement, the detector row for which the iso-center is based need not to undergo protection shift, since the defined reconstruction iso-center is the row iso-center. Data from the other detector rows is shifted relative to the selected detector row. When the gantry iso-center of one of the detector rows (e.g., one of the center rows) is selected as the reconstruction iso-center, the reconstructed image will be shifted along y′-axis relative to the original compensation schemes described above. To ensure the images generated with both schemes are identical in location, an adjustment can be added in the backprojection process.

    摘要翻译: 为了减少与上述等中心位移相比的计算负荷,代替选择坐标系的z轴作为重构的等中心,检测器行之一的台架等中心(例如,一个 选择中心行)作为重建等中心。 在这种布置中,等中心所基于的检测器行不需要进行保护移位,因为定义的重构等中心是行等中心。 来自其他检测器行的数据相对于所选择的检测器行移位。 当选择检测器行之一(例如中心行之一)的台架等中心作为重建等中心时,重构图像将相对于上述原始补偿方案沿y'轴移动。 为了确保使用两种方案生成的图像位置相同,可以在反投影过程中添加调整。

    Methods and apparatus for two-pass CT imaging
    59.
    发明授权
    Methods and apparatus for two-pass CT imaging 有权
    二次CT成像的方法和装置

    公开(公告)号:US06418183B1

    公开(公告)日:2002-07-09

    申请号:US09749821

    申请日:2000-12-28

    IPC分类号: A61B603

    摘要: One aspect of the present invention is a method for imaging a volume of a patient with a computed tomographic (CT) imaging system. The method includes steps of: scanning a volume of a patient with a first, full field of view (FOV) scan to acquire first projection data; scanning a smaller volume of the patient with a second, restricted FOV scan to acquire second projection data; estimating an amount of shift between the first projection data and the second projection data resulting from patient movement; and blending first projection data with second projection data in accordance with the estimated amount of shift to estimate projections of the second scan.

    摘要翻译: 本发明的一个方面是用计算机断层摄影(CT)成像系统对患者体积进行成像的方法。 该方法包括以下步骤:用第一全视野(FOV)扫描扫描患者体积以获取第一投影数据; 用第二限制FOV扫描扫描较小体积的患者以获得第二投影数据; 估计由患者移动导致的第一投影数据和第二投影数据之间的偏移量; 以及根据所估计的偏移量将第一投影数据与第二投影数据进行混合以估计第二扫描的投影。

    Volumetric computed tomography system for cardiac imaging including a system for communicating data over a network
    60.
    发明授权
    Volumetric computed tomography system for cardiac imaging including a system for communicating data over a network 失效
    用于心脏成像的体积计算机断层摄影系统,包括用于通过网络传送数据的系统

    公开(公告)号:US06408043B1

    公开(公告)日:2002-06-18

    申请号:US09473247

    申请日:1999-12-27

    IPC分类号: A61B600

    摘要: A method for generating an image of an object using a computed tomography (CT) imaging system, which includes at least one x-ray detector array and at least one rotating x-ray source projecting an x-ray beam, includes the steps of identifying a physiological cycle of the object (the cycle comprising a plurality of phases); selecting at least one phase of the object; collecting at least one segment of projection data for each selected phase of the object during each rotation of each x-ray source; generating a projection data set by combining the projection data segments; generating a cross-sectional image of the entire object from the projection data set; and communicating the image or data associated with the image to a remote facility. The remote facility provides remote services over a network.

    摘要翻译: 一种使用计算机断层摄影(CT)成像系统产生物体的图像的方法,该系统包括至少一个X射线检测器阵列和投射X射线束的至少一个旋转x射线源,包括识别 物体的生理周期(包括多个相的周期); 选择对象的至少一个阶段; 在每个x射线源的每次旋转期间收集对象的每个所选相位的至少一个投影数据段; 通过组合所述投影数据段来生成投影数据集; 从所述投影数据集生成整个对象的横截面图像; 并将与图像相关联的图像或数据传送到远程设施。 远程设备通过网络提供远程服务。