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公开(公告)号：US09226723B2
公开(公告)日：2016-01-05
申请号：US14189790
申请日：2014-02-25
CPC分类号： A61B6/5205 , A61B6/032 , G06T5/001 , G06T7/0012 , G06T11/006 , G06T2207/10072 , G06T2211/424
摘要： A spectral computed tomography (CT) ordered subsets (OS) reconstruction method using two sets of projection data having a different number of views is provided. The method includes obtaining a first set of projection data that includes single-energy CT data for a first number of views, obtaining a second set of projection data that includes spectral CT data for a second number of views, wherein the first and second numbers are integers and the second number is smaller than the first number, partitioning the first set of projection data into N equal-sized subsets of projection data, including the second set of projection data in each of the N subsets of projection data to generate N expanded subsets of projection data, and performing OS reconstruction with the N expanded subsets of projection data to generate a reconstructed CT image.
摘要翻译： 提供了使用具有不同视图数量的两组投影数据的频谱计算机断层摄影（CT）有序子集（OS）重建方法。 该方法包括获得第一组投影数据，其包括用于第一数量视图的单能量CT数据，获得第二组投影数据，其包括用于第二数量视图的光谱CT数据，其中第一和第二数字是 整数，第二个数字小于第一个数字，将第一组投影数据划分成投影数据的N个相等大小的子集，包括N个投影数据子集中的第二组投影数据，以产生N个扩展子集 的投影数据，并且利用投影数据的N个扩展子集来执行OS重建以生成重建的CT图像。
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2.发明授权Method for scattering correction for sparsely distributed stationary detectors and rotating X-ray source 有权用于稀疏分布的固定式检测器和旋转X射线源的散射校正方法公开(公告)号：US09198632B2
公开(公告)日：2015-12-01
申请号：US13780900
申请日：2013-02-28
发明人： Yuexing Zhang , Yu Zou , Daniel Gagnon
CPC分类号： A61B6/5282 , A61B6/032 , A61B6/4241 , A61B6/4275 , A61B6/482
摘要： A spectral computed tomography scanner apparatus, including a rotating X-ray source, a plurality of fixed energy-discriminating detectors, a processor that generates a shadow map that indicates, for each detector/view angle, a shadow state of the detector, the shadow state indicating that one of X-rays are completely blocked by a second detector and do not reach the detector, the X-rays are partially blocked by the second detector and partially reach the detector, the X-rays are not blocked by any of the detectors and reach the detector, and the detector is not with the scan field of view at the view angle, and a controller configured to cause the scanner apparatus to perform a scan of an object over a first range of view angles to collect view data, wherein the processor is configured to perform scatter correction using the collected view data and the generated shadow map.
摘要翻译： 包括旋转X射线源，多个固定能量鉴别检测器的光谱计算机断层摄影扫描仪装置，产生阴影图的处理器，其针对每个检测器/视角指示检测器的阴影状态，阴影 指示X射线中的一个被第二检测器完全阻挡并且不到达检测器的状态，X射线被第二检测器部分地阻挡并部分地到达检测器，X射线不被任何 检测器并且到达检测器，并且检测器在视角不具有扫描视野，并且控制器被配置为使得扫描仪装置在第一视角范围上执行对象的扫描以收集视图数据， 其中所述处理器被配置为使用所收集的视图数据和所生成的阴影贴图来执行散射校正。
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3.发明授权Apparatus and method for count loss calibration of photon-counting detectors in spectral computed tomography imaging 有权光谱计算机断层成像中光子计数检测器的计数丢失校准的装置和方法公开(公告)号：US09155516B2
公开(公告)日：2015-10-13
申请号：US13770638
申请日：2013-02-19
发明人： Xiaolan Wang , Yu Zou
CPC分类号： A61B6/582 , A61B6/032 , A61B6/42 , A61B6/4208 , A61B6/4233 , A61B6/4241 , A61B6/482 , A61B6/52 , A61B6/5294 , A61B6/58 , A61B6/583 , G01N23/087 , G01T1/17 , G01T1/2985 , G01T1/36 , G01T1/365
摘要： A method for photon count-loss calibration in a computed-tomography (CT) scanner, including capturing incident X-ray photons via a plurality of energy-discriminating detectors, determining photon counts of the captured incident X-ray photons in a plurality of energy windows at each energy-discriminating detector, and adjusting the determined photon counts in each energy window for each energy-discriminating detector based on a pre-determined photon count-loss look-up table and the determined photon counts.
摘要翻译： 一种用于计算机断层摄影（CT）扫描仪中的光子计数损耗校准的方法，包括通过多个能量鉴别检测器捕获入射的X射线光子，确定多个能量中捕获的入射X射线光子的光子计数 在每个能量鉴别检测器处的窗口，以及基于预定的光子计数损耗查找表和所确定的光子计数来调整每个能量鉴别检测器的每个能量窗口中确定的光子计数。
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4.发明授权Registration of 4th generation detectors relative to the 3rd generation CT system coordinates using 4th generation sinogram data 有权第4代检测器相对于第3代CT系统的记录使用第4代正弦图数据进行坐标公开(公告)号：US09155515B2
公开(公告)日：2015-10-13
申请号：US14190829
申请日：2014-02-26
发明人： Adam Petschke , Yuexing Zhang , Yu Zou
CPC分类号： A61B6/547 , A61B6/032 , A61B6/035 , A61B6/4241 , A61B6/4266 , A61B6/482 , A61B6/583 , A61B6/584 , A61B6/585 , A61B6/587
摘要： A method is provided for determining, for a fourth-generation computed tomography (CT) scanner that includes a third-generation X-ray source and detector system and a plurality fixed, sparse photon-counting detectors (PCDs), a position of each PCD of the plurality of PCDs. The method includes determining, for a given PCD, a set of view angles at which the PCD will cast a shadow on the third-generation detector; determining, for each view, by analyzing projection data obtained from a reference scan, a corresponding shadow location on the third-generation detector caused by the given PCD; generating, for each view, a line connecting a position of the X-ray source at the view angle, and a corresponding shadow location of the set of shadow locations; determining locations of all intersection points of the set of lines; and determining a PCD centerline of the given PCD based on the locations of the intersection points.
摘要翻译： 提供了一种用于确定包括第三代X射线源和检测器系统和多个固定的稀疏光子计数检测器（PCD）的第四代计算机断层摄影（CT）扫描器的方法，每个PCD的位置 的多个PCD。 该方法包括针对给定的PCD确定PCD在第三代检测器上投射阴影的一组视角; 通过分析从参考扫描获得的投影数据，确定由所述给定PCD引起的所述第三代检测器上的对应阴影位置; 为每个视图生成连接X射线源的视角位置和该组阴影位置的对应阴影位置的线; 确定该组线的所有交点的位置; 并根据交点的位置确定给定PCD的PCD中心线。
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5.发明申请APPARATUS AND METHOD FOR DYNAMIC CALIBRATION OF SPECTRAL CT WITH ROTATING X-RAY SOURCE AND STATIONARY ENERGY DISCRIMINATING DETECTORS 有权具有旋转X射线源和静态能量鉴别探测器的光谱校正动态校准装置和方法公开(公告)号：US20140328451A1
公开(公告)日：2014-11-06
申请号：US13886645
申请日：2013-05-03
发明人： Yuexing ZHANG , Xiaolan Wang , Yu Zou
CPC分类号： G01T7/005 , G01N23/046
摘要： An apparatus and method for dynamically calibrating a computed-tomography (CT) scanner that includes a rotating X-ray source and a plurality of stationary energy-discriminating detectors configured to capture incident X-ray photons emitted from the X-ray source. A bowtie filter with a unique geometry and material composition is used to generate reference beams of a desired intensity. The apparatus includes a processor that is configured to remove a scattering background based on data obtained from the reference beams and compute a change in a predetermined calibration function.
摘要翻译： 一种用于动态校准包括旋转X射线源和多个静态能量鉴别检测器的计算机断层摄影（CT）扫描仪的装置和方法，其被配置为捕获从X射线源发射的入射X射线光子。 使用具有独特几何形状和材料组成的弓形过滤器来产生所需强度的参考光束。 该装置包括处理器，其被配置为基于从参考光束获得的数据去除散射背景并计算预定校准功能的变化。
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6.发明申请HYBRID PASSIVE/ACTIVE MULTI-LAYER ENERGY DISCRIMINATING PHOTON-COUNTING DETECTOR 审中-公开混合被动/有源多层能量分辨光电计数检测器公开(公告)号：US20160206255A1
公开(公告)日：2016-07-21
申请号：US14599141
申请日：2015-01-16
发明人： Daniel GAGNON , Michael Silver , Yuexing Zhang , Gin-Chung Wang , Yu Zou
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/4275 , A61B6/482 , G01T1/00 , G01T1/2008 , G01T1/242
摘要： A photon-counting detector apparatus is configured to receive X-rays transmitted from an X-ray source. The photon-counting detector apparatus includes a first photon-counting detector having a first detecting material configured to detect photons using a first set of energy bins. The photon-counting detector apparatus also includes a second photon-counting detector arranged above the first photon-counting detector relative to an incidence direction of the X-rays transmitted from the X-ray source. The second photon-counting detector has a second detecting material configured to detect photons using a second set of energy bins. The first set of energy bins differs from the second set of energy bins.
摘要翻译： 光子计数检测器装置被配置为接收从X射线源发送的X射线。 光子计数检测器装置包括具有第一检测材料的第一光子计数检测器，其被配置为使用第一组能量箱检测光子。 光子计数检测装置还包括相对于从X射线源发射的X射线的入射方向布置在第一光子计数检测器上方的第二光子计数检测器。 第二光子计数检测器具有第二检测材料，其被配置为使用第二组能量箱来检测光子。 第一组能量箱与第二组能量箱不同。
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公开(公告)号：US09256938B2
公开(公告)日：2016-02-09
申请号：US14190170
申请日：2014-02-26
发明人： Adam Petschke , Yu Zou
CPC分类号： G06T7/0012 , A61B6/032 , A61B6/4241 , G06K9/52 , G06T5/00 , G06T2207/10081 , G06T2207/10116
摘要： A method and an apparatus for determining primary and secondary escape probabilities for a large photon-counting detector without pile-up. A model for the detector with no pile-up is formulated and used for spectrum correction in a computed tomography scanner. The method includes computing primary K-escape and secondary K-escape probabilities occurring at a certain depth within the photon-counting detector. Further, a no pile-up model for the photon-counting detector is formulated by determining a response function, based on the computed primary and secondary K-escape probabilities and geometry of the photon-counting detector. The method includes obtaining a measured CT scan of an object and further performs spectrum correction by determining the incident input spectrum based on the response function and the measured spectrum of the large photon-counting detector.
摘要翻译： 一种用于确定没有堆积的大型光子计数检测器的一次和二次逸出概率的方法和装置。 用于没有堆积的检测器的模型被制定并用于计算机断层扫描仪中的频谱校正。 该方法包括计算在光子计数检测器内的一定深度处发生的初级K-逃逸和二次K-逃逸概率。 此外，光子计数检测器的无堆叠模型通过基于所计算的初级和次级K逃逸概率和光子计数检测器的几何形状来确定响应函数来制定。 该方法包括获得对象的测量CT扫描，并且还通过基于响应函数和大光子计数检测器的测量光谱确定入射输入光谱进行光谱校正。
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8.发明授权Synchronized view data acquisition between stationary spectral detectors and rotating energy integrating detectors for spectral computer-aided tomography 有权用于光谱计算机辅助断层扫描的固定光谱检测器和旋转能量积分检测器之间的同步视图数据采集公开(公告)号：US09216005B2
公开(公告)日：2015-12-22
申请号：US14064660
申请日：2013-10-28
发明人： Alan Karr , Yu Zou , Yuexing Zhang , Hiroaki Miyazaki
摘要： A control circuit for a computer-aided tomography (CT) system includes an input that receives a master timing signal and an input that receives a first timing signal. The control circuit includes a mode detection circuit that determines the scan mode of the CT system based on the master timing signal and a first timing signal, where the frequency of the first time signal is lower than the frequency of the master timing signal. The control circuit also includes a circuit that generates a second timing signal based on the master timing signal and the scan mode, where the second timing signal that has a lower frequency than the master timing frequency but a higher frequency than the frequency of the first timing signal.
摘要翻译： 用于计算机辅助断层摄影（CT）系统的控制电路包括接收主定时信号的输入端和接收第一定时信号的输入端。 控制电路包括模式检测电路，其基于主定时信号和第一定时信号确定CT系统的扫描模式，其中第一时间信号的频率低于主定时信号的频率。 控制电路还包括基于主定时信号和扫描模式产生第二定时信号的电路，其中第二定时信号具有比主定时频率低的频率但频率高于第一定时的频率 信号。
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公开(公告)号：US20150257722A1
公开(公告)日：2015-09-17
申请号：US14212637
申请日：2014-03-14
发明人： Gin-Chung WANG , Daniel Gagnon , Yu Zou
CPC分类号： A61B6/4241 , A61B6/032 , G01N23/087 , G01T1/2985
摘要： An apparatus is provided that includes a digital processing circuit to obtain a digital signal corresponding to an output signal of a photon-counting detector; determine, from the obtained digital signal, a plurality of X-ray photons received by the photon-counting detector during a measurement period; determine a corresponding energy level of each of the plurality of X-ray photons; determine, based on the corresponding energy level, a corresponding weight for each of the plurality of X-ray photons; and calculate a sum of the corresponding weights of the plurality of X-ray photons.
摘要翻译： 提供了一种装置，其包括：数字处理电路，用于获得与光子计数检测器的输出信号对应的数字信号; 从所获得的数字信号中确定在测量期间由所述光子计数检测器接收的多个X射线光子; 确定所述多个X射线光子中的每一个的对应能级; 基于所述相应的能量级别确定所述多个X射线光子中的每一个的对应的权重; 并计算多个X射线光子的相应权重的和。
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10.发明申请SPARSE AND ENERGY DISCRIMINATING COLLIMATED DETECTOR ELEMENTS TO ASSIST SCATTER EVALUATION IN CT IMAGING 有权扫描和能量分辨检测器元件以辅助CT成像中的散射体评估公开(公告)号：US20140105354A1
公开(公告)日：2014-04-17
申请号：US14134732
申请日：2013-12-19
发明人： Daniel GAGNON , Yu Zou , Xiaolan Wang
IPC分类号： G01N23/04
CPC分类号： G01N23/046 , A61B6/032 , A61B6/4078 , A61B6/4233 , A61B6/4291 , A61B6/5282 , G01T1/242 , H05G1/02
摘要： A computed-tomography apparatus that includes a CT scanner including an X-ray source and a detector covering respective angle ranges in the axial and transaxial planes of the CT scanner. The CT detector includes first detector elements disposed on a first surface to capture incident X-ray photons emitted from the X-ray source, and second detector elements sparsely disposed on a second surface different from the first surface, the second surface being farther away from the scanner than the first surface, the second detector elements being smaller in number than the first detector elements. Each of the second detector elements is reachable only by X-ray photons originating in a small angle range around a line connecting the X-ray source and a center of the surface of the detector element, the small angle range being determined by the predetermined distance separating the first and second surfaces and a size of the detector element.
摘要翻译： 一种计算机断层摄影装置，其包括CT扫描仪，其包括X射线源和覆盖CT扫描器的轴向和横轴平面中的相应角度范围的检测器。 CT检测器包括设置在第一表面上以捕获从X射线源发射的入射X射线光子的第一检测器元件，以及稀疏地设置在不同于第一表面的第二表面上的第二检测器元件，第二表面远离 扫描器比第一表面，第二检测器元件的数量小于第一检测器元件。 每个第二检测器元件只能由围绕连接X射线源和检测器元件的表面的中心的线的小角度范围内的X射线光子到达，小角度范围由预定距离确定 分离第一和第二表面以及检测器元件的尺寸。
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