公开(公告)号：US20070092066A1

公开(公告)日：2007-04-26

申请号：US11163496

申请日：2005-10-20

申请人： J. Tkaczyk ,  Deborah Walter ,  Xiaoye Wu ,  Brian Bales ,  James Leblanc ,  Yanfeng Du

发明人： J. Tkaczyk ,  Deborah Walter ,  Xiaoye Wu ,  Brian Bales ,  James Leblanc ,  Yanfeng Du

IPC分类号： G21K3/00

CPC分类号： G21K1/10

摘要： A bowtie filter is constructed to have a fluidic envelope filled with attenuating fluid and a displacement insert that can present various x-ray attenuation profiles during a scan. The insert is designed to displace the attenuating fluid to achieve a denied attenuating or filtering profile. The insert can be rotated, twisted, moved, and otherwise contorted within the fluidic envelope as needed during the course of a scan. As the angle, position and shape of the zombie is changed, the x-ray profile of the filter changes. The insert may have a default shape when at rest, but can have its shape changed when external forces are placed thereon. As x-ray filtering needs change during the course of the scan, the insert can be compressed, stretched, and/or contorted to achieve additional filtering profiles.

摘要翻译： 弓形过滤器被构造成具有填充有衰减流体的流体信封和可在扫描期间呈现各种x射线衰减分布的位移插入件。 插入件被设计成使衰减流体移位以实现被拒绝的衰减或过滤轮廓。 在扫描过程中，插入物可以根据需要旋转，扭转，移动，并且在流体封套内扭曲。 随着僵尸的角度，位置和形状的改变，过滤器的X射线轮廓也会改变。 当静止时，插入件可以具有默认形状，但是当外力在其上放置时，其形状可以改变。 由于X射线过滤在扫描过程中需要更改，所以插入物可以被压缩，拉伸和/或扭转以实现额外的过滤轮廓。

公开(公告)号：US07488945B2

公开(公告)日：2009-02-10

申请号：US11291273

申请日：2005-11-30

申请人： Wen Li ,  John Eric Tkaczyk ,  Yanfeng Du ,  James Leblanc

发明人： Wen Li ,  John Eric Tkaczyk ,  Yanfeng Du ,  James Leblanc

IPC分类号： G01T1/24

CPC分类号： H01L27/14603 ,  G01T1/2928 ,  H01L27/14659

摘要： Count rates may be obtained from one or more subpixels for a given pixel in an imaging system detector. Count rates may be obtained from individual subpixels, or may be from electronically binned subpixels at least in part in various subpixel arrangements where a selected subpixel arrangement may be adaptively set according to a detected count rate. For lower count rates, two or more subpixels may be electronically binned together and the counts may be obtained from the binned subpixels, for example to mitigate a charge sharing effect. For higher count rates, the count rates of a greater number of subpixels may be individually obtained, for example to mitigate a pulse pile-up effect. Detective quantum efficiency may be optimized over a wider range of photon flux rate via the adaptive subpixel arrangement.

摘要翻译： 可以从成像系统检测器中的给定像素的一个或多个子像素获得计数率。 可以从各个子像素获得计数速率，或者可以至少部分地根据检测到的计数速率自适应地选择所选择的子像素排列的各种子像素排列从电子分组的子像素获得。 对于较低的计数率，可以将两个或更多个子像素电子地分组在一起，并且可以从二进制子像素获得计数，例如以减轻电荷共享效应。 对于更高的计数率，可以单独获得更多数量的子像素的计数率，例如以减轻脉冲堆积效应。 可以通过自适应子像素排列在更宽的光子通量速率范围内优化探测量子效率。

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：US20050084069A1

公开(公告)日：2005-04-21

申请号：US10687131

申请日：2003-10-16

申请人： Yanfeng Du ,  John Tkaczyk

发明人： Yanfeng Du ,  John Tkaczyk

IPC分类号： A61B6/00 ,  A61B6/03 ,  H05G1/64

CPC分类号： A61B6/583 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/405 ,  A61B6/482

摘要： A method for analyzing materials in an object includes acquiring x-ray projection data of the object at high energy and at low energy for a plurality of views. The acquired x-ray projection data is utilized in a material decomposition to determine material densities at each pixel for two selected basis materials. A composition of an object at each pixel is determined utilizing a determined mapping of material density regions for the two selected basis materials. An image indicative of the composition of the object is displayed utilizing the determined composition.

摘要翻译： 用于分析对象中的材料的方法包括以高能量和低能量获取多个视图的物体的X射线投影数据。 所获取的X射线投影数据用于材料分解以确定两个所选基础材料的每个像素处的材料密度。 使用所选择的两种材料的材料密度区域的确定的映射来确定每个像素处的对象的组成。 使用所确定的构图来显示表示对象的构图的图像。

公开(公告)号：US20070189443A1

公开(公告)日：2007-08-16

申请号：US11692086

申请日：2007-03-27

申请人： Deborah Walter ,  Yanfeng Du ,  Kelly Piacsek

发明人： Deborah Walter ,  Yanfeng Du ,  Kelly Piacsek

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

CPC分类号： A61B6/405 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/4241 ,  A61B6/481 ,  A61B6/482 ,  A61B6/504 ,  A61B6/583 ,  G06T7/0012 ,  G06T7/136 ,  G06T2207/10081 ,  G06T2207/30032 ,  G06T2207/30101

摘要： An imaging scanner includes a radiation source, a radiation detector, and a computer programmed to decompose CT data acquired by the radiation detector into a set of pixels, each pixel having at least a first basis material content and a second basis material content. The computer is further programmed to identify a first subset of the set of pixels as a possible embolism, based on the content of the first basis material and the content of the second basis material.

摘要翻译： 成像扫描器包括辐射源，辐射检测器和被编程为将由辐射检测器获取的CT数据分解成一组像素的计算机，每个像素具有至少第一基础材料内容和第二基础材料内容。 计算机还被编程为基于第一基础材料的内容和第二基础材料的内容，将该组像素的第一子集识别为可能的栓塞。

公开(公告)号：US07583779B2

公开(公告)日：2009-09-01

申请号：US10904716

申请日：2004-11-24

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

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

IPC分类号： A61B6/00

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。

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。

公开(公告)号：US07696483B2

公开(公告)日：2010-04-13

申请号：US11837328

申请日：2007-08-10

申请人： John Eric Tkaczyk ,  Samit Kumar Basu ,  Wen Li ,  Yanfeng Du

发明人： John Eric Tkaczyk ,  Samit Kumar Basu ,  Wen Li ,  Yanfeng Du

IPC分类号： G01T1/24

CPC分类号： G01T1/171 ,  G01T1/247 ,  G01T1/249

摘要： A photon-counting detector includes a direct conversion material and a data acquisition system with a first comparator having a first signal level threshold indicative of a noise level of a spectrum of photons, the first comparator configured to output a count when the electrical signal level exceeds the first signal level threshold, and a second comparator having a second signal level threshold indicative of the maximum energy of the spectrum of photons, the second comparator configured to output a count when the electrical signal exceeds the second signal level threshold where a photon count is determined based on the counts from the first and second comparators.

摘要翻译： 光子计数检测器包括直接转换材料和具有第一比较器的数据采集系统，第一比较器具有指示光子谱的噪声电平的第一信号电平阈值，第一比较器被配置为当电信号电平超过时输出计数 第一信号电平阈值和具有指示光子谱的最大能量的第二信号电平阈值的第二比较器，第二比较器被配置为当电信号超过第二信号电平阈值时输出计数，其中光子计数是 基于来自第一和第二比较器的计数确定。

公开(公告)号：US20070290142A1

公开(公告)日：2007-12-20

申请号：US11454532

申请日：2006-06-16

申请人： Yanfeng Du ,  John Eric Tkaczyk ,  Wen Li

发明人： Yanfeng Du ,  John Eric Tkaczyk ,  Wen Li

IPC分类号： G01T1/24

CPC分类号： G01T1/241

摘要： An electrode assembly having an adjustable active area is provided. The electrode assembly is configured to detect photons. The electrode assembly includes a central readout electrode, and one or more bias control portions. The bias control portions are disposed adjacent to the central readout electrode. The active area is altered by controlling voltages of the bias control portions relative to a voltage of the central readout electrode.

摘要翻译： 提供具有可调节有效面积的电极组件。 电极组件被配置为检测光子。 电极组件包括中央读出电极和一个或多个偏置控制部分。 偏置控制部分邻近中央读出电极设置。 通过控制偏置控制部分相对于中央读出电极的电压的电压来改变有效区域。

公开(公告)号：US07212604B2

公开(公告)日：2007-05-01

申请号：US11171169

申请日：2005-06-29

申请人： John Eric Tkaczyk ,  James Walter Leblanc ,  Wen Li ,  Deborah Joy Walter ,  Yanfeng Du

发明人： John Eric Tkaczyk ,  James Walter Leblanc ,  Wen Li ,  Deborah Joy Walter ,  Yanfeng Du

IPC分类号： H01L25/00

CPC分类号： G01T1/2985 ,  G01T1/241 ,  G01T1/242 ,  G01T1/243 ,  G01T1/249

摘要： A computed tomography detector module is presented. The detector module includes a substrate having a topside and a bottom side. Additionally, the detector module includes a plurality of detector layers disposed on the top side of the substrate in a direction that is substantially orthogonal to the substrate, where each of the plurality of detector layers comprises a direct conversion material configured to absorb radiation, and where each of the plurality of detector layers comprises a first side and a second side. Further, the detector module includes a plurality of pixelated anode contacts is disposed on the first side of each of the plurality of detector layers. Also, the detector module includes a common cathode contact is disposed on the second side of each of the plurality of detector layers.

摘要翻译： 提出了一种计算机断层扫描检测器模块。 检测器模块包括具有顶侧和底侧的基板。 另外，检测器模块包括多个检测器层，该多个检测器层沿基本上垂直于衬底的方向设置在衬底的顶侧上，其中多个检测器层中的每一个包括被配置为吸收辐射的直接转换材料，并且其中 多个检测器层中的每一个包括第一侧和第二侧。 此外，检测器模块包括多个像素化的阳极触点设置在多个检测器层中的每一个的第一侧上。 此外，检测器模块包括公共阴极接触件设置在多个检测器层中的每一个的第二侧上。