公开(公告)号：US07260174B2

公开(公告)日：2007-08-21

申请号：US10939787

申请日：2004-09-13

申请人： David M. Hoffman ,  James LeBlanc ,  John Tkaczyk ,  Robert F. Senzig ,  Yanfeng Du

发明人： David M. Hoffman ,  James LeBlanc ,  John Tkaczyk ,  Robert F. Senzig ,  Yanfeng Du

IPC分类号： A61B6/03 ,  G01T1/161

CPC分类号： G01T1/2928 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/5205

摘要： A CT detector capable of energy discrimination and direct conversion is disclosed. The detector includes multiple layers of semiconductor material with the layers having varying thicknesses. The detector is constructed to be segmented in the x-ray penetration direction so as to optimize count rate performance as well as avoid saturation. The detector also includes variable pixel pitch and a flexible binning of pixels to further enhance count rate performance.

摘要翻译： 公开了能够鉴别和直接转换的CT检测器。 检测器包括多层半导体材料，其中层具有变化的厚度。 检测器被构造成在x射线穿透方向上分段，以便优化计数率性能以及避免饱和。 检测器还包括可变像素间距和灵活的像素分组，以进一步提高计数率性能。

公开(公告)号：US20070116173A1

公开(公告)日：2007-05-24

申请号：US11627072

申请日：2007-01-25

申请人： Jerome Arenson ,  Evgeny Drapkin ,  Yanfeng Du ,  Lev Greenberg ,  Oded Meirav ,  David Ruimi ,  John Tkaczyk ,  Xiaoye Wu

发明人： Jerome Arenson ,  Evgeny Drapkin ,  Yanfeng Du ,  Lev Greenberg ,  Oded Meirav ,  David Ruimi ,  John Tkaczyk ,  Xiaoye Wu

IPC分类号： A61B6/00 ,  H05G1/60 ,  G01N23/00 ,  G21K1/12

CPC分类号： G01T1/1644 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/583 ,  G01T1/1647 ,  G06T5/002 ,  G06T5/20 ,  G06T2207/10081 ,  G06T2207/30004 ,  G06T2207/30112 ,  Y10S378/901

摘要： An adaptive CT data acquisition system and technique is presented whereby radiation emitted for CT data acquisition is dynamically controlled to limit exposure to those detectors of a CT detector assembly that may be particularly susceptible to saturation during a given data acquisition. The data acquisition technique recognizes that for a given subject size and position that pre-subject filtering and collimating of a radiation beam may be insufficient to completely prevent detector saturation. Therefore, the present invention includes implementation of a number of CT data correction techniques for correcting otherwise unusable data of a saturated CT detector. These data correction techniques include a nearest neighbor correction, off-centered phantom correction, off-centered synthetic data correction, scout data correction, planar radiogram correction, and a number of others. The invention is applicable with energy discriminating CT systems as well as with conventional CT systems and other multi-energy CT systems, such as dual kVp-based systems.

公开(公告)号：US20070076848A1

公开(公告)日：2007-04-05

申请号：US11239962

申请日：2005-09-30

申请人： Deborah Walter ,  John Tkaczyk ,  Yanfeng Du

发明人： Deborah Walter ,  John Tkaczyk ,  Yanfeng Du

IPC分类号： H05G1/64

CPC分类号： A61B6/032 ,  A61B6/4241 ,  A61B6/585 ,  G01T1/171

摘要： A method of scanning a subject to be imaged is presented. The method includes acquiring projection data from a first region of a pixel, where the first region has a first area. Additionally, the method includes acquiring projection data from a second region of the pixel, where the second region has a second area. The method also includes combining projection data from the first and second regions to obtain composite projection data for the pixel. Computer-readable medium and systems that afford functionality of the type defined by this method are also contemplated in conjunction with the present technique.

摘要翻译： 呈现扫描被摄体的方法。 该方法包括从像素的第一区域获取投影数据，其中第一区域具有第一区域。 另外，该方法包括从像素的第二区域获取投影数据，其中第二区域具有第二区域。 该方法还包括组合来自第一和第二区域的投影数据以获得像素的复合投影数据。 计算机可读介质和提供由该方法定义的类型的功能的系统也结合本技术考虑。

公开(公告)号：US20070076842A1

公开(公告)日：2007-04-05

申请号：US11239842

申请日：2005-09-30

申请人： John Tkaczyk ,  Deborah Walter ,  Yanfeng Du ,  David Hoffman ,  Thomas Toth

发明人： John Tkaczyk ,  Deborah Walter ,  Yanfeng Du ,  David Hoffman ,  Thomas Toth

IPC分类号： H05G1/60 ,  H05G1/44 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

CPC分类号： A61B6/032 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/405 ,  A61B6/4085 ,  A61B6/4241 ,  A61B6/463 ,  A61B6/466 ,  A61B6/469 ,  A61B6/482 ,  A61B6/488 ,  A61B6/503 ,  A61B6/504 ,  A61B6/544

摘要： A method of enhancing image quality and providing tissue composition information by analysis of energy discrimination data, the method comprising determining a radiation dosage at one or more energy spectrum levels based on patient parameters and user selected parameters. Computer-readable medium and systems that afford functionality of the type defined by this method are also contemplated in conjunction with the present technique.

摘要翻译： 一种通过分析能量鉴别数据来增强图像质量和提供组织组成信息的方法，所述方法包括基于患者参数和用户选择的参数来确定一个或多个能量级别的辐射剂量。 计算机可读介质和提供由该方法定义的类型的功能的系统也结合本技术考虑。

公开(公告)号：US20060109949A1

公开(公告)日：2006-05-25

申请号：US10904716

申请日：2004-11-24

申请人： J. Tkaczyk ,  Deborah Walter ,  Yanfeng Du

发明人： J. Tkaczyk ,  Deborah Walter ,  Yanfeng Du

IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

CPC分类号： A61B6/032 ,  A61B6/4035 ,  A61B6/4241 ,  A61B6/482 ,  A61B6/5258 ,  A61B6/542 ,  G01N2223/419 ,  G01N2223/423 ,  G06T11/006

摘要： A system and method are disclosed for reconstructing contrast-enhanced CT images that are substantially free of beam-hardening artifacts. An imaging system includes a radiation source configured to project radiation toward an object to be scanned and an energy discriminating detector assembly having a plurality of detector elements and configured to detect radiation emitted by the radiation source and attenuated by the object to be scanned. The imaging system also includes computer programmed to count a number of photons detected by each detector element and associate an energy value to each counted photon and determine a material composition of a CT view from the number of photons counted and the energy value associated with each counted photon. The computer is also programmed to apply a weighting to the CT view based on the material composition of the CT view and reconstruct an image with differential weighting based on the weighting of the CT view.

摘要翻译： 公开了一种系统和方法，用于重建基本上没有束固化假象的对比度增强的CT图像。 成像系统包括被配置为向待扫描的物体投射辐射的辐射源，以及具有多个检测器元件并被配置为检测由辐射源发射并被被扫描物体衰减的辐射的能量鉴别检测器组件。 成像系统还包括被编程为对每个检测器元件检测到的数量的光子进行计数的计算机，并将能量值与每个计数光子相关联并且根据所计数的光子数量和与每个计数相关联的能量值确定CT视图的材料组成 光子。 计算机还被编程为基于CT视图的材料组成对CT视图应用加权，并且基于CT视图的加权重建具有差分加权的图像。