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    • 12. 发明申请
    • SYSTEMS AND METHODS FOR SCANNING AND DATA ACQUISITION IN COMPUTED TOMOGRAPHY (CT) APPLICATIONS
    • 计算机断层扫描(CT)应用中扫描和数据采集的系统和方法
    • US20090161819A1
    • 2009-06-25
    • US12096443
    • 2006-09-16
    • Astrid LewalterRainer PietigGuenter ZeitlerKai EckChristoph HerrmannRainer KiewittChristoph LoefOliver MuelhensCarolina RibbingGeorg RoseMatthias SimonOlaf Wischhusen
    • Astrid LewalterRainer PietigGuenter ZeitlerKai EckChristoph HerrmannRainer KiewittChristoph LoefOliver MuelhensCarolina RibbingGeorg RoseMatthias SimonOlaf Wischhusen
    • H05G1/60H01J35/30
    • A61B6/032A61B6/027A61B6/4021A61B6/503A61B6/504H01J2235/086H05G1/52
    • Systems and methods for data acquisition in computed tomography (CT) applications are provided. The systems and methods are particularly adapted for scanning and acquiring/processing data in connection with high-power cone-beam CT applications. The electron beam is moved/scanned along the anode surface to multiple focal positions. Data acquisition for a full projection at one focus position and one view angle is achieved by activating each focus position multiple times during the data acquisition for one angle of the gantry. The detector array and associated data processing system are adapted to rapidly switch between the different focus positions during the acquisitions for one view angle and to collect all data belonging to the same projection into the same data set. Adaptive electron optics are utilized to move/scan the electron beam along the anode surface to the various focus positions. Alternatively, a plurality of cathodes may be provided for respective focus positions and the system may support fast switching therebetween to achieve desirably short spot times. The disclosed CT system permits greater power densities without risk of heat damage to the anode and effectively increases the track velocity of the electron beam on the anode surface. The CT system and associated data acquisition methods have particular utility in CT applications requiring increased time resolution and/or spatial resolution, e.g., cardiac CT applications.
    • 提供了计算机断层摄影(CT)应用中数据采集的系统和方法。 该系统和方法特别适用于扫描和获取/处理与大功率锥束CT应用有关的数据。 电子束沿着阳极表面移动/扫描到多个焦点位置。 通过在台架的一个角度的数据采集过程中激活每个聚焦位置多次来实现在一个聚焦位置和一个视角下的全投影的数据采集。 检测器阵列和相关联的数据处理系统适于在一次视角的采集期间在不同聚焦位置之间快速切换,并且将属于相同投影的所有数据收集到同一数据集中。 使用自适应电子光学器件将电子束沿着阳极表面移动/扫描到各种焦点位置。 或者,可以为各个焦点位置设置多个阴极,并且系统可以支持它们之间的快速切换,以实现期望的短光斑时间。 所公开的CT系统允许更大的功率密度,而不会对阳极造成热损害的风险,并且有效地增加阳极表面上的电子束的轨道速度。 CT系统和相关数据采集方法在需要增加时间分辨率和/或空间分辨率(例如心脏CT应用)的CT应用中具有特别的用途。
    • 18. 发明授权
    • Cone beam CT apparatus using truncated projections and a previously acquired 3D CT image
    • 锥形CT设备使用截断投影和先前获取的3D CT图像
    • US07440535B2
    • 2008-10-21
    • US11568115
    • 2005-03-31
    • Thomas NetschGeorg RoseHermann Schomberg
    • Thomas NetschGeorg RoseHermann Schomberg
    • G01N23/00
    • G06T11/005A61B6/027G06T2211/432Y10S378/901
    • A 3D image of a region of an object is computed from truncated cone beam projection data acquired with an x-ray device and a prior CT image representing a larger region of the object. The truncated projection data are extrapolated to derive pseudoprojection data associated with projection directions outside the detector, and an intermediate CT image is reconstructed based on the truncated projection data completed with the pseudoprojection data. The prior CT image is then registered with the intermediate CT image. Forward projection data associated with projection directions outside the detector are computed from the truncated projection data and the registered prior CT image. The 3D image is finally reconstructed based on the truncated projection data completed with the forward projection data.
    • 使用由X射线装置获得的截头圆锥束投影数据和表示对象的较大区域的先前CT图像计算物体区域的3D图像。 外推截断的投影数据以导出与检测器外部的投影方向相关联的伪投影数据,并且基于用伪投影数据完成的截断的投影数据来重建中间CT图像。 然后将先前的CT图像与中间CT图像对准。 从截断的投影数据和注册的先前CT图像计算与检测器外部的投影方向相关联的前向投影数据。 基于用前向投影数据完成的截断的投影数据,最终重建3D图像。