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1. 发明申请

US20130251286A1 ITERATIVE RECONSTRUCTION ALGORITHM WITH A CONSTANT VARIANCE BASED WEIGHTING FACTOR 有权
标题翻译：基于恒定变量因子的迭代重构算法
公开(公告)号：US20130251286A1
公开(公告)日：2013-09-26
申请号：US13990450
申请日：2011-11-25
申请人： Bernhard Johannes Brendel , Thomas Koehler , Holger Schmitt , Rolf Dieter Bippus , Roland Proksa
发明人： Bernhard Johannes Brendel , Thomas Koehler , Holger Schmitt , Rolf Dieter Bippus , Roland Proksa
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/424
摘要： A method includes reconstructing measured projection data using an iterative statistical reconstruction algorithm that reduces image artifact caused by differences in variances in projections of the measured projection data used to update a voxel of the image for one or more voxels of the image. A reconstructor includes a processor that reconstructs measured projection data using an iterative statistical reconstruction algorithm that reduces or mitigates image artifact caused by differences in variances in projections used to update a voxel of the image for one or more voxels of the image. A computer readable storage medium encoded with computer executable instructions, which, when executed by a processor of a computer, cause the processor to: reduce image artifact caused by differences in variances in projections used to update a voxel of an image for one or more voxels of the image using an iterative statistical reconstruction algorithm.
摘要翻译：一种方法包括使用迭代统计重建算法来重建测量的投影数据，所述迭代统计重构算法减少由用于更新图像的一个或多个体素的图像的体素的测量投影数据的投影方差的差异引起的图像伪像。重构器包括使用迭代统计重建算法来重建测量的投影数据的处理器，其减少或减轻由用于更新图像的一个或多个体素的图像的体素的投影方差的差异引起的图像伪像。一种用计算机可执行指令编码的计算机可读存储介质，其在由计算机的处理器执行时使处理器能够：减少由用于更新一个或多个体素的图像的体素的投影差异的差异引起的图像伪像的图像使用迭代统计重建算法。

2. 发明授权

US09299169B2 Iterative reconstruction algorithm with a constant variance based weighting factor 有权
标题翻译：具有恒定方差加权因子的迭代重建算法
公开(公告)号：US09299169B2
公开(公告)日：2016-03-29
申请号：US13990450
申请日：2011-11-25
申请人： Bernhard Johannes Brendel , Thomas Koehler , Holger Schmitt , Rolf Dieter Bippus , Roland Proksa
发明人： Bernhard Johannes Brendel , Thomas Koehler , Holger Schmitt , Rolf Dieter Bippus , Roland Proksa
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/424
摘要： A method includes reconstructing measured projection data using an iterative statistical reconstruction algorithm that reduces image artifact caused by differences in variances in projections of the measured projection data used to update a voxel of the image for one or more voxels of the image. A reconstructor includes a processor that reconstructs measured projection data using an iterative statistical reconstruction algorithm that reduces or mitigates image artifact caused by differences in variances in projections used to update a voxel of the image for one or more voxels of the image. A computer readable storage medium encoded with computer executable instructions, which, when executed by a processor of a computer, cause the processor to: reduce image artifact caused by differences in variances in projections used to update a voxel of an image for one or more voxels of the image using an iterative statistical reconstruction algorithm.
摘要翻译：一种方法包括使用迭代统计重建算法来重建测量的投影数据，所述迭代统计重构算法减少由用于更新图像的一个或多个体素的图像的体素的测量投影数据的投影方差的差异引起的图像伪像。重构器包括使用迭代统计重建算法来重建测量的投影数据的处理器，其减少或减轻由用于更新图像的一个或多个体素的图像的体素的投影方差的差异引起的图像伪像。一种用计算机可执行指令编码的计算机可读存储介质，其在由计算机的处理器执行时使处理器能够：减少由用于更新一个或多个体素的图像的体素的投影差异的差异引起的图像伪像的图像使用迭代统计重建算法。

3. 发明授权

US09002090B2 Forward projection apparatus 有权
标题翻译：前投投影仪
公开(公告)号：US09002090B2
公开(公告)日：2015-04-07
申请号：US13988349
申请日：2011-11-16
申请人： Thomas Koehler , Bernhard Johannes Brendel , Holger Schmitt , Rolf Dieter Bippus
发明人： Thomas Koehler , Bernhard Johannes Brendel , Holger Schmitt , Rolf Dieter Bippus
IPC分类号： G06K9/00 , G06T11/00
CPC分类号： G06T11/005 , G06T11/008 , G06T2211/424
摘要： The invention relates to a forward projection apparatus for performing a forward projection through an image (22), wherein at least one of a number of rays (20, 21) for performing the forward projection, a ray spacing between the rays and a kernel width of an interpolation kernel for calculating interpolated values located on the rays is varied depending on the ray width relative to an effective image element spacing between image elements (24) of the image. This allows reducing artifacts in simulated projection data and, thus, in an image, which is iteratively reconstructed by using the simulated projection data. For example, if the number of provided rays and/or the ray spacing between the provided rays is varied, aliasing artifacts can be reduced. Moreover, if the ray spacing between the provided rays and/or the kernel width of the interpolation kernel is varied, artifacts caused by varying effective kernel widths may be reduced.
摘要翻译：本发明涉及一种用于通过图像（22）进行向前投影的前投影装置，其中，用于执行向前投影的多个光线（20,21）中的至少一个，光线之间的光线间隔和核宽度用于计算位于光线上的内插值的插值内核根据相对于图像的图像元素（24）之间的有效图像元素间隔的光线宽度而变化。这允许减少模拟投影数据中的伪影，并因此减少通过使用模拟投影数据迭代重建的图像。例如，如果提供的光线的数量和/或所提供的光线之间的光线间隔变化，则可以减少混叠伪影。此外，如果所提供的光线之间的光线间距和/或内插核的内核宽度发生变化，则可能会降低由变化的有效内核宽度引起的伪影。

4. 发明申请

US20130243297A1 FORWARD PROJECTION APPARATUS 有权
标题翻译：前进投影装置
公开(公告)号：US20130243297A1
公开(公告)日：2013-09-19
申请号：US13988349
申请日：2011-11-16
申请人： Thomas Koehler , Bernhard Johannes Brendel , Holger Schmitt , Rolf Dieter Bippus
发明人： Thomas Koehler , Bernhard Johannes Brendel , Holger Schmitt , Rolf Dieter Bippus
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , G06T11/008 , G06T2211/424
摘要： The invention relates to a forward projection apparatus for performing a forward projection through an image (22), wherein at least one of a number of rays (20, 21) for performing the forward projection, a ray spacing between the rays and a kernel width of an interpolation kernel for calculating interpolated values located on the rays is varied depending on the ray width relative to an effective image element spacing between image elements (24) of the image. This allows reducing artifacts in simulated projection data and, thus, in an image, which is iteratively reconstructed by using the simulated projection data. For example, if the number of provided rays and/or the ray spacing between the provided rays is varied, aliasing artifacts can be reduced. Moreover, if the ray spacing between the provided rays and/or the kernel width of the interpolation kernel is varied, artifacts caused by varying effective kernel widths may be reduced.
摘要翻译：本发明涉及一种用于通过图像（22）进行向前投影的前投影装置，其中，用于执行向前投影的多个光线（20,21）中的至少一个，光线之间的光线间隔和核宽度用于计算位于光线上的内插值的插值内核根据相对于图像的图像元素（24）之间的有效图像元素间隔的光线宽度而变化。这允许减少模拟投影数据中的伪影，并因此减少通过使用模拟投影数据迭代重建的图像。例如，如果提供的光线的数量和/或所提供的光线之间的光线间隔变化，则可以减少混叠伪影。此外，如果所提供的光线之间的光线间距和/或内插核的内核宽度发生变化，则可能会降低由变化的有效内核宽度引起的伪影。

5. 发明授权

US09230348B2 Imaging system for imaging a region of interest 有权
标题翻译：用于成像感兴趣区域的成像系统
公开(公告)号：US09230348B2
公开(公告)日：2016-01-05
申请号：US13994775
申请日：2011-12-15
申请人： Roland Proksa , Bernhard Johannes Brendel , Thomas Koehler
发明人： Roland Proksa , Bernhard Johannes Brendel , Thomas Koehler
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/408 , G06T2211/424
摘要： The noise of a detection value acquired by an imaging system (30) can depend on the contributions of different components within a region of interest to be imaged, which has been traversed by radiation (4) causing the respective acquired detection value. This dependence is considered while iteratively reconstructing an image of the region of interest, wherein first component attenuation values, which correspond to elements of a first component within the region of interest, and second component attenuation values, which correspond to elements of a first component within the region of interest, are determined, wherein noise values are determined from the first component attenuation values and the second component attenuation values and wherein the noise values are used for updating the image. This consideration of the dependence of the noise of an acquired detection value on the different components improves the quality of the iteratively reconstructed image.
摘要翻译：由成像系统（30）获取的检测值的噪声可以取决于被成像的感兴趣区域内的不同部件的贡献，其已被辐射（4）穿过，导致相应的获取的检测值。在迭代地重建感兴趣区域的图像的同时考虑这种依赖性，其中对应于感兴趣区域内的第一分量的元素的第一分量衰减值和与第一分量衰减值对应的第二分量衰减值确定感兴趣区域，其中根据第一分量衰减值和第二分量衰减值确定噪声值，并且其中噪声值用于更新图像。对所获取的检测值的噪声对不同分量的依赖性的考虑改善了迭代重建图像的质量。

6. 发明申请

US20130279785A1 IMAGING SYSTEM FOR IMAGING A REGION OF INTEREST 有权
标题翻译：用于成像区域的成像系统
公开(公告)号：US20130279785A1
公开(公告)日：2013-10-24
申请号：US13994775
申请日：2011-12-15
申请人： Roland Proksa , Bernhard Johannes Brendel , Thomas Koehler
发明人： Roland Proksa , Bernhard Johannes Brendel , Thomas Koehler
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/408 , G06T2211/424
摘要： The noise of a detection value acquired by an imaging system (30) can depend on the contributions of different components within a region of interest to be imaged, which has been traversed by radiation (4) causing the respective acquired detection value. This dependence is considered while iteratively reconstructing an image of the region of interest, wherein first component attenuation values, which correspond to elements of a first component within the region of interest, and second component attenuation values, which correspond to elements of a first component within the region of interest, are determined, wherein noise values are determined from the first component attenuation values and the second component attenuation values and wherein the noise values are used for updating the image. This consideration of the dependence of the noise of an acquired detection value on the different components improves the quality of the iteratively reconstructed image.
摘要翻译：由成像系统（30）获取的检测值的噪声可以取决于被成像的感兴趣区域内的不同部件的贡献，其已被辐射（4）穿过，导致相应的获取的检测值。在迭代地重建感兴趣区域的图像的同时考虑这种依赖性，其中对应于感兴趣区域内的第一分量的元素的第一分量衰减值和与第一分量衰减值对应的第二分量衰减值确定感兴趣区域，其中根据第一分量衰减值和第二分量衰减值确定噪声值，并且其中噪声值用于更新图像。对所获取的检测值的噪声对不同分量的依赖性的考虑改善了迭代重建图像的质量。

7. 发明授权

US09044187B2 Post-patient dynamic filter for computed tomography (CT) 有权
标题翻译：用于计算机断层扫描（CT）的患者后动态滤波器
公开(公告)号：US09044187B2
公开(公告)日：2015-06-02
申请号：US13992302
申请日：2011-12-02
申请人： Thomas Koehler , Holger Schmitt , Roland Proksa
发明人： Thomas Koehler , Holger Schmitt , Roland Proksa
IPC分类号： A61B6/00 , A61B6/03 , G21K1/10 , A61B6/06
CPC分类号： A61B6/4035 , A61B6/032 , A61B6/06 , A61B6/4241 , A61B6/4291 , A61B6/488 , A61B6/544 , G21K1/10
摘要： An imaging system includes a radiation source (310) configured to rotate around an examination region about a z-axis and having a focal spot that emits a radiation beam that traverses the examination region. The system further includes a radiation sensitive detector array (314) with a plurality of detector pixels that detects radiation traversing the examination region and generates projection data indicative of the detected radiation. The system further includes a dynamic post-patient filter (316) including one or more filter segments (402, 802, 902, 1004, 1102). The filter is configured to selectively and dynamically move in front of the detector array between the detector array and the examination region and into and out of a path of the radiation beam illuminating the detector pixels during scanning an object or subject based on a shape of the object or subject, thereby filtering unattenuated radiation and radiation traversing a periphery of the object or subject.
摘要翻译：成像系统包括被配置为围绕z轴围绕检查区域旋转并具有发射穿过检查区域的辐射束的焦点的辐射源（310）。该系统还包括具有多个检测器像素的辐射敏感检测器阵列（314），其检测穿过检查区域的辐射，并产生指示检测到的辐射的投影数据。该系统还包括动态的患者后过滤器（316），其包括一个或多个过滤器段（402,802,902,1004,1102）。滤波器被配置为在检测器阵列和检查区域之间选择性地和动态地在检测器阵列之前移动，并且在扫描对象或被摄体期间，在扫描对象或被摄体期间进入和离开照射检测器像素的辐射束的路径，物体或物体，从而过滤未被衰减的辐射和穿过物体或物体的周边的辐射。

8. 发明授权

US08861674B2 Computed tomography apparatus 有权
标题翻译：计算机断层摄影仪
公开(公告)号：US08861674B2
公开(公告)日：2014-10-14
申请号：US13509840
申请日：2010-12-10
申请人： Thomas Koehler , Roland Proksa , Ewald Roessl
发明人： Thomas Koehler , Roland Proksa , Ewald Roessl
IPC分类号： A61B6/00 , A61B6/03 , G01N23/04 , G06T11/00
CPC分类号： A61B6/032 , A61B6/469 , A61B6/542 , G01N23/046 , G01N2223/419 , G06T11/005 , Y10S378/901
摘要： The invention relates to a computed tomography apparatus for imaging an object. The computed tomography apparatus comprises a radiation source (2) for generating modulated radiation (4) traversing the object and a detector (6) for generating detection values depending on the radiation (4) after having traversed the object, while the radiation source (2) and the object are moved relative to each other. A weight providing unit (14) provides modulation weights for weighting the detection values depending on the modulation of the radiation (4) and a reconstruction unit (15) reconstructs an image of the object, wherein the detection values are weighted based on the provided modulation weights and an image of the object is reconstructed from the weighted detection values. This can allow to optimize the dose application to the object by modulating the radiation accordingly, wherein the reconstructed images still have a high quality.
摘要翻译：本发明涉及一种用于对物体成像的计算机断层摄影装置。计算机断层摄影装置包括用于产生经过物体的调制辐射（4）的辐射源（2）和用于在穿过物体之后产生取决于辐射（4）的检测值的检测器（6），而辐射源）并且对象相对于彼此移动。权重提供单元（14）根据辐射（4）的调制提供用于对检测值进行加权的调制权重，并且重建单元（15）重建对象的图像，其中基于所提供的调制对所述检测值进行加权从加权检测值重建对象的权重和图像。这可以通过相应地调节辐射来优化对物体的剂量应用，其中重建的图像仍然具有高质量。

9. 发明申请

US20120250821A1 COMPUTED TOMOGRAPHY APPARATUS 有权
标题翻译：计算机摄影装置
公开(公告)号：US20120250821A1
公开(公告)日：2012-10-04
申请号：US13509840
申请日：2010-12-10
申请人： Thomas Koehler , Roland Proksa , Ewald Roessl
发明人： Thomas Koehler , Roland Proksa , Ewald Roessl
IPC分类号： G01N23/04
CPC分类号： A61B6/032 , A61B6/469 , A61B6/542 , G01N23/046 , G01N2223/419 , G06T11/005 , Y10S378/901
摘要： The invention relates to a computed tomography apparatus for imaging an object. The computed tomography apparatus comprises a radiation source (2) for generating modulated radiation (4) traversing the object and a detector (6) for generating detection values depending on the radiation (4) after having traversed the object, while the radiation source (2) and the object are moved relative to each other. A weight providing unit (14) provides modulation weights for weighting the detection values depending on the modulation of the radiation (4) and a reconstruction unit (15) reconstructs an image of the object, wherein the detection values are weighted based on the provided modulation weights and an image of the object is reconstructed from the weighted detection values. This can allow to optimize the dose application to the object by modulating the radiation accordingly, wherein the reconstructed images still have a high quality.
摘要翻译：本发明涉及一种用于对物体成像的计算机断层摄影装置。计算机断层摄影装置包括用于产生经过物体的调制辐射（4）的辐射源（2）和用于在穿过物体之后产生取决于辐射（4）的检测值的检测器（6），而辐射源）并且对象相对于彼此移动。权重提供单元（14）根据辐射（4）的调制提供用于对检测值进行加权的调制权重，并且重建单元（15）重建对象的图像，其中基于所提供的调制对所述检测值进行加权从加权检测值重建对象的权重和图像。这可以通过相应地调节辐射来优化对物体的剂量应用，其中重建的图像仍然具有高质量。

10. 发明申请

US20130329851A1 DETECTION APPARATUS 有权
标题翻译：检测装置
公开(公告)号：US20130329851A1
公开(公告)日：2013-12-12
申请号：US14000414
申请日：2012-02-20
申请人： Ewald Rossl , Thomas Koehler , Roland Proksa
发明人： Ewald Rossl , Thomas Koehler , Roland Proksa
IPC分类号： G21K1/00
CPC分类号： G21K1/00 , A61B6/027 , A61B6/032 , A61B6/4035 , A61B6/4078 , A61B6/4233 , A61B6/482
摘要： The invention relates to a detection apparatus comprising a filter (20) for filtering a conical radiation beam (4) such that at least a first region (22) and a second region (23) of the radiation beam are generated having different energy spectra, wherein the first region of the radiation beam illuminates a first detector area (25) on a detection surface (21) of a detector, thereby generating a first set of detection values, and the second region of the radiation beam illuminates a second detector area (26) on the detection surface, thereby generating a second set of detection values. For example, by using the filter the detection apparatus can be used as dual-energy computed tomography apparatus, wherein, for instance, a standard computed tomography apparatus can be transformed to a dual-energy computed tomography apparatus by adding the filter to the standard computed tomography apparatus, preferentially without modifying the radiation source and the detector.
摘要翻译：本发明涉及一种检测装置，其包括用于过滤锥形辐射束（4）的过滤器（20），使得产生具有不同能谱的辐射束的至少第一区域（22）和第二区域（23）其中辐射束的第一区域照射检测器的检测表面（21）上的第一检测器区域（25），从而产生第一组检测值，并且辐射束的第二区域照亮第二检测器区域 26），从而产生第二组检测值。例如，通过使用滤波器，检测装置可以用作双能计算机断层摄影装置，其中，例如，标准计算机断层摄影装置可以通过将滤波器加到标准计算机断层摄影装置优选不改变辐射源和检测器的断层摄影装置。

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