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。

公开(公告)号：US08314395B2

公开(公告)日：2012-11-20

申请号：US12550921

申请日：2009-08-31

申请人： Minglong Zhang ,  Yanfeng Du ,  John Eric Tkaczyk ,  Zhaoping Wu ,  Ira Blevis

发明人： Minglong Zhang ,  Yanfeng Du ,  John Eric Tkaczyk ,  Zhaoping Wu ,  Ira Blevis

IPC分类号： G01T1/24

CPC分类号： H01L31/115 ,  H01L31/1185

摘要： A radiation detector includes a semiconductor crystal having a first surface and a second surface opposite to the first surface, a first electrode electrically coupled with the first surface of the semiconductor crystal to allow current to flow between the first electrode and the crystal, and an insulating layer on the first surface and between the semiconductor crystal and the first electrode so as to create a partially transmissive electrical barrier between the first electrode and the crystal. The insulating layer has a thickness ranging from about 50 nanometers to about 500 nanometers.

摘要翻译： 辐射检测器包括具有与第一表面相对的第一表面和第二表面的半导体晶体，与半导体晶体的第一表面电耦合以允许电流在第一电极和晶体之间流动的第一电极，以及绝缘 在所述第一表面和所述半导体晶体与所述第一电极之间，以在所述第一电极和所述晶体之间产生部分透射的电屏障。 绝缘层的厚度范围为约50纳米至约500纳米。

公开(公告)号：US08159286B2

公开(公告)日：2012-04-17

申请号：US12199020

申请日：2008-08-27

申请人： Naresh Kesavan Rao ,  Brian David Yanoff ,  Yanfeng Du ,  Jianjun Guo

发明人： Naresh Kesavan Rao ,  Brian David Yanoff ,  Yanfeng Du ,  Jianjun Guo

IPC分类号： H03K5/00

CPC分类号： G06G7/18 ,  A61B6/037 ,  G01T1/247 ,  G01T1/249 ,  G01T1/2985

摘要： An event time stamping system comprising a current source, an integrator comprising an input and an output, and configured to output a voltage proportional to the length of time the current source is coupled to the input, and one or more switches configured to couple the current source to the input of the integrator upon receipt of an event signal and configured to de-couple the current source from the input of the integrator upon receipt of a control trigger. The system further comprises a lock-out signal generator configured to generate a lock-out signal, and a controller coupled to the one or more switches, wherein the controller is configured to generate the control trigger based on the lock-out signal to ensure a minimum integration time.

摘要翻译： 一种事件时间戳系统，包括电流源，积分器，包括输入和输出，并且被配置为输出与电流源耦合到输入端的时间长度成比例的电压;以及一个或多个开关，被配置为耦合电流 在接收到事件信号时将其提供给积分器的输入，并且被配置为在接收到控制触发时将积分器的输入与当前源解耦。 所述系统还包括被配置为产生锁定信号的锁定信号发生器和耦合到所述一个或多个开关的控制器，其中所述控制器被配置为基于所述锁定信号产生所述控制触发，以确保 最小积分时间。

公开(公告)号：US20100329425A1

公开(公告)日：2010-12-30

申请号：US12490903

申请日：2009-06-24

申请人： Jianjun Guo ,  Naresh Kesavan Rao ,  John Eric Tkaczyk ,  Yanfeng Du ,  Naveen Chandra

发明人： Jianjun Guo ,  Naresh Kesavan Rao ,  John Eric Tkaczyk ,  Yanfeng Du ,  Naveen Chandra

IPC分类号： H05G1/26 ,  G01T1/24 ,  H05G1/28

CPC分类号： G01T1/247

摘要： A data acquisition system includes a charge-sensitive amplifier (CSA) configured to receive a charge from an x-ray detector, the CSA includes a high-gain electronic voltage amplifier, an electrical energy storage device coupled with the amplifier, and an electrical resistor coupled with the amplifier. The data acquisition system includes a baseline sampling circuit configured to receive an output from the CSA and to sample a baseline signal from the CSA, at least one discriminator coupled to an output of the CSA and to an output of the baseline sampling circuit, the at least one discriminator configured to output a voltage if the output of the CSA exceeds a threshold, and a counter coupled to an output of the discriminator and configured to output a digital signal indicative of a photon count received at the x-ray detector and based on the output from the CSA and on the signal from the CSA.

摘要翻译： 数据采集​​系统包括被配置为从X射线检测器接收电荷的电荷敏感放大器（CSA），CSA包括高增益电子电压放大器，与放大器耦合的电能存储装置和电阻器 加上放大器。 数据采集​​系统包括基准采样电路，其被配置为从CSA接收输出并从CSA采样基线信号，耦合到CSA的输出和基线采样电路的输出的至少一个鉴别器， 如果所述CSA的输出超过阈值，则配置成输出电压的至少一个鉴别器，以及耦合到所述鉴别器的输出并被配置为输出指示在所述x射线检测器处接收的光子计数的数字信号的计数器，并且基于 CSA的输出和CSA的信号。

公开(公告)号：US20100193697A1

公开(公告)日：2010-08-05

申请号：US12365100

申请日：2009-02-03

申请人： Girish Bal ,  Floribertus Heukensfeldt Jansen ,  Osnat Zak ,  Gideon Berlad ,  Yaron Hefetz ,  Sergei Dolinsky ,  Brian D. Yanoff ,  John Eric Tkaczyk ,  Yanfeng Du ,  Ravindra Mohan Manjeshwar ,  Evren Asma ,  Qian Hua

发明人： Girish Bal ,  Floribertus Heukensfeldt Jansen ,  Osnat Zak ,  Gideon Berlad ,  Yaron Hefetz ,  Sergei Dolinsky ,  Brian D. Yanoff ,  John Eric Tkaczyk ,  Yanfeng Du ,  Ravindra Mohan Manjeshwar ,  Evren Asma ,  Qian Hua

IPC分类号： G01T1/00 ,  G01T1/172

CPC分类号： G01T1/249 ,  G01T1/247

摘要： An apparatus and methods for evaluating the operation of pixelated detectors are provided. The method includes obtaining data values for each of a plurality of pixels of a pixelated detector and determining a data consistency metric for each of the plurality of detector pixels. The method further includes identifying, using the determined data consistency metric, any detector pixels that exceed an acceptance criterion as noisy pixels.

摘要翻译： 提供了一种用于评估像素化检测器的操作的装置和方法。 该方法包括获得像素化检测器的多个像素中的每一个的数据值，并确定多个检测器像素中的每一个的数据一致性度量。 该方法还包括使用所确定的数据一致性度量来识别超过接受标准的任何检测器像素作为噪声像素。

公开(公告)号：US07760123B2

公开(公告)日：2010-07-20

申请号：US12198989

申请日：2008-08-27

申请人： Naresh Kesavan Rao ,  Brian David Yanoff ,  Yanfeng Du ,  Jianjun Guo

发明人： Naresh Kesavan Rao ,  Brian David Yanoff ,  Yanfeng Du ,  Jianjun Guo

IPC分类号： H03M1/12

CPC分类号： G06G7/18

摘要： A data acquisition system including a readout Application Specific Integrated Circuit (ASIC) having a plurality of channels, each channel having a time discriminating circuit and an energy discriminating circuit, wherein the ASIC is configured to receive a plurality of signals from a semiconductor radiation detector. The data acquisition system also includes a digital-to-analog converter (DAC) electrically coupled to the ASIC and configured to provide a reference signal to the ASIC used in the generation of digital outputs from the ASIC, and a controller electrically coupled to the ASIC and to the DAC, the controller configured to instruct the DAC to provide the reference signal to the ASIC.

摘要翻译： 一种数据采集系统，包括具有多个通道的读出专用集成电路（ASIC），每个通道具有时间鉴别电路和能量识别电路，其中ASIC被配置为从半导体辐射检测器接收多个信号。 数据采集​​系统还包括电耦合到ASIC的数模转换器（DAC），并被配置为向ASIC中产生数字输出使用的ASIC提供参考信号，以及电耦合到ASIC的控制器 并且所述控制器被配置为指示所述DAC向所述ASIC提供所述参考信号。