公开(公告)号：US20080135789A1

公开(公告)日：2008-06-12

申请号：US11609262

申请日：2006-12-11

申请人： Yanfeng Du ,  John Eric Tkaczyk

发明人： Yanfeng Du ,  John Eric Tkaczyk

IPC分类号： G01N23/04

CPC分类号： A61B6/4241 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/482 ,  A61B6/583

摘要： A diagnostic imaging system in an example comprises a high frequency electromagnetic energy source, a detector, a data acquisition system (DAS), and a computer. The high frequency electromagnetic energy source emits a beam of high frequency electromagnetic energy toward an object to be imaged. The detector receives high frequency electromagnetic energy emitted by the high frequency electromagnetic energy source. The DAS is operably connected to the detector. The computer is operably connected to the DAS and programmed to employ a threshold to trigger a filter operation on a pixel, in a basis material decomposition (BMD) image of a plurality of BMD images, through comparison of an actual noise ratio between a pair of BMD images, of the plurality of BMD images, to a theoretical BMD noise ratio value. The computer operably connected to the DAS is programmed to employ a correlation in noise distribution of the plurality of BMD images to reduce image noise in the plurality of BMD images. The computer operably connected to the DAS is programmed to realize an adaptive algorithm through employment of an exponential correction function of a difference between the actual noise ratio and the theoretical BMD noise ratio value. The computer operably connected to the DAS is programmed to employ the adaptive algorithm to reduce the image noise in the plurality of BMD images.

摘要翻译： 示例中的诊断成像系统包括高频电磁能源，检测器，数据采集系统（DAS）和计算机。 高频电磁能源朝向要成像的物体发射高频电磁能束。 检测器接收高频电磁能源发出的高频电磁能。 DAS可操作地连接到检测器。 计算机可操作地连接到DAS，并且被编程为通过比较多个BMD图像中的实际噪声比，在多个BMD图像的基础材料分解（BMD）图像中采用阈值来触发像素上的滤波器操作 多个BMD图像中的BMD图像达到理论BMD噪声比值。 可操作地连接到DAS的计算机被编程为在多个BMD图像的噪声分布中采用相关性，以减少多个BMD图像中的图像噪声。 可操作地连接到DAS的计算机被编程为通过使用实际噪声比和理论BMD噪声比值之间的差的指数校正函数来实现自适应算法。 可操作地连接到DAS的计算机被编程为采用自适应算法来减少多个BMD图像中的图像噪声。

公开(公告)号：US07308073B2

公开(公告)日：2007-12-11

申请号：US11163496

申请日：2005-10-20

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

发明人： J. Eric Tkaczyk ,  Deborah J. Walter ,  Xiaoye Wu ,  Brian C. Bales ,  James W. 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：US20070248209A1

公开(公告)日：2007-10-25

申请号：US11768775

申请日：2007-06-26

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

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

IPC分类号： G01N23/00

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：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：US07065234B2

公开(公告)日：2006-06-20

申请号：US10784099

申请日：2004-02-23

申请人： Yanfeng Du ,  Forrest Frank Hopkins

发明人： Yanfeng Du ,  Forrest Frank Hopkins

IPC分类号： G06K9/00

CPC分类号： G06T11/005 ,  A61B6/5282

摘要： A method of correcting scatter includes obtaining a voxellized representation of a 3D image of an object from a plurality of projection data. A single scatter profile for the object is calculated using the voxellized representation of the 3D image of the object. A total scatter profile for the object is determined using the single scatter profile and an adjustment factor and the projection data is corrected using the total scatter profile to obtain a scatter corrected projection data. A beam hardening correction method includes simulating a number of attenuation data for an x-ray spectrum, at least one object material, and a detector spectral response. A function is fitted to the attenuation data to obtain an attenuation curve. A number of projection data for an object are corrected using the attenuation curve to obtain a number of beam hardening corrected projection data. A corrected image of the object is reconstructed from the beam hardening corrected image data.

摘要翻译： 校正散射的方法包括从多个投影数据获得对象的3D图像的体素化表示。 使用对象的3D图像的体素化表示来计算对象的单个散点图。 使用单个散射曲线和调整因子确定对象的总散射曲线，并且使用总散射曲线校正投影数据以获得散射校正的投影数据。 光束硬化校正方法包括模拟用于X射线光谱，至少一种物体材料和检测器光谱响应的多个衰减数据。 对衰减数据拟合一个函数以获得衰减曲线。 使用衰减曲线来校正用于对象的多个投影数据，以获得多个光束硬化校正投影数据。 从光束硬化校正图像数据重建对象的校正图像。

公开(公告)号：US06987833B2

公开(公告)日：2006-01-17

申请号：US10687131

申请日：2003-10-16

申请人： Yanfeng Du ,  John Eric Tkaczyk

发明人： Yanfeng Du ,  John Eric Tkaczyk

IPC分类号： G01N23/087

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：US20050185753A1

公开(公告)日：2005-08-25

申请号：US10784099

申请日：2004-02-23

申请人： Yanfeng Du ,  Forrest Hopkins

发明人： Yanfeng Du ,  Forrest Hopkins

IPC分类号： G01N23/04 ,  G06T11/00 ,  G21K1/12

CPC分类号： G06T11/005 ,  A61B6/5282

摘要： A method of correcting scatter includes obtaining a voxellized representation of a 3D image of an object from a plurality of projection data. A single scatter profile for the object is calculated using the voxellized representation of the 3D image of the object. A total scatter profile for the object is determined using the single scatter profile and an adjustment factor and the projection data is corrected using the total scatter profile to obtain a scatter corrected projection data. A beam hardening correction method includes simulating a number of attenuation data for an x-ray spectrum, at least one object material, and a detector spectral response. A function is fitted to the attenuation data to obtain an attenuation curve. A number of projection data for an object are corrected using the attenuation curve to obtain a number of beam hardening corrected projection data. A corrected image of the object is reconstructed from the beam hardening corrected image data.

摘要翻译： 校正散射的方法包括从多个投影数据获得对象的3D图像的体素化表示。 使用对象的3D图像的体素化表示来计算对象的单个散点图。 使用单个散射曲线和调整因子确定对象的总散射曲线，并且使用总散射曲线校正投影数据以获得散射校正的投影数据。 光束硬化校正方法包括模拟用于X射线光谱，至少一种物体材料和检测器光谱响应的多个衰减数据。 对衰减数据拟合一个函数以获得衰减曲线。 使用衰减曲线来校正用于对象的多个投影数据，以获得多个光束硬化校正投影数据。 从光束硬化校正图像数据重建对象的校正图像。

公开(公告)号：US08610081B2

公开(公告)日：2013-12-17

申请号：US13304255

申请日：2011-11-23

申请人： Naresh Kesavan Rao ,  Walter Dixon, III ,  Yanfeng Du

发明人： Naresh Kesavan Rao ,  Walter Dixon, III ,  Yanfeng Du

IPC分类号： G01J1/42

CPC分类号： G01T1/247

摘要： Systems and methods for generating control signal in radiation detector systems are provided. One system includes a scheduling architecture having at least one anode channel connected to a detector of the radiation detector system. The anode channel includes a charge sensitive amplifier and a signal shaper, wherein the anode channel is configured to generate at least one control signal to control data acquisition by the detector. The scheduling architecture also includes at least one shaper timer configured having a time constant to define timing for the generation of the control signal without using a clock.

摘要翻译： 提供了用于在辐射探测器系统中产生控制信号的系统和方法。 一个系统包括具有连接到辐射探测器系统的检测器的至少一个阳极通道的调度架构。 阳极通道包括电荷敏感放大器和信号整形器，其中阳极通道被配置为产生至少一个控制信号以控制检测器的数据采集。 调度架构还包括至少一个整形器定时器，其被配置为具有时间常数以定义用于生成控制信号的定时而不使用时钟。

公开(公告)号：US20130161523A1

公开(公告)日：2013-06-27

申请号：US13336389

申请日：2011-12-23

申请人： John Eric Tkaczyk ,  Vladimir A. Lobastov ,  Yanfeng Du

发明人： John Eric Tkaczyk ,  Vladimir A. Lobastov ,  Yanfeng Du

IPC分类号： G01T1/24 ,  H01L31/18 ,  G01T1/16

CPC分类号： H01L31/085 ,  G01T1/241

摘要： A radiation detector is provided employing a focus grid electrode. The focus grid electrode is biased relative to one or more anode electrodes. In this manner, movement of electrons to the anode electrodes may be enhanced, such as due to a higher electrical field strength in a conversion material and/or due to focusing of the resulting electrical field on the anode electrodes.

摘要翻译： 使用焦点栅极设置放射线检测器。 聚焦栅极相对于一个或多个阳极电极偏置。 以这种方式，可以增加电子向阳极电极的移动，例如由于转换材料中较高的电场强度和/或由于所得电场在阳极上的聚焦。

公开(公告)号：US20130126748A1

公开(公告)日：2013-05-23

申请号：US13304255

申请日：2011-11-23

申请人： Naresh Kesavan Rao ,  Walter Dixon, III ,  Yanfeng Du

发明人： Naresh Kesavan Rao ,  Walter Dixon, III ,  Yanfeng Du

IPC分类号： H03L7/00 ,  G01T1/17

CPC分类号： G01T1/247

摘要： Systems and methods for generating control signal in radiation detector systems are provided. One system includes a scheduling architecture having at least one anode channel connected to a detector of the radiation detector system. The anode channel includes a charge sensitive amplifier and a signal shaper, wherein the anode channel is configured to generate at least one control signal to control data acquisition by the detector. The scheduling architecture also includes at least one shaper timer configured having a time constant to define timing for the generation of the control signal without using a clock.

摘要翻译： 提供了用于在辐射探测器系统中产生控制信号的系统和方法。 一个系统包括具有连接到辐射探测器系统的检测器的至少一个阳极通道的调度架构。 阳极通道包括电荷敏感放大器和信号整形器，其中阳极通道被配置为产生至少一个控制信号以控制检测器的数据采集。 调度架构还包括至少一个整形器定时器，其被配置为具有时间常数以定义用于生成控制信号的定时而不使用时钟。