公开(公告)号：US20110064202A1

公开(公告)日：2011-03-17

申请号：US12992409

申请日：2009-05-08

申请人： Axel Thran ,  Peter Forthmann ,  Roland Proksa ,  Thomas Koehler

发明人： Axel Thran ,  Peter Forthmann ,  Roland Proksa ,  Thomas Koehler

IPC分类号： H01J35/08 ,  H01J35/00 ,  H01J35/06 ,  H01J35/30

CPC分类号： H01J35/10 ,  H01J35/30 ,  H01J2235/086 ,  H05G1/52 ,  H05G1/58

摘要： To scan an object with differently shaped cone beams (112, 122), the present invention provides a CT scanner with a moveable X-ray tube (the meaning of “move the x-ray tube among a plurality of predefined positions” also covers the situation that the anode disk is moved among a plurality of corresponding positions, while the shell of the x-ray tube does not move). The X-ray tube is not only moveable along the axial direction, but also along the radial direction of the CT scanner gantry. The scanner comprises an X-ray tube, which X-ray tube further comprises: an anode disk (100), comprising a plurality of focal tracks (110, 120) each focal track being cone-shaped with an anode angle (114, 124) different from the anode angle(s) of the other focal track(s); and a first cathode (210), configured to emanate an electron beam targeting at least one of the plurality of focal tracks. When different focal tracks are bombarded by electron beams, different X-ray beams (112, 122) with differently shaped cone beams are generated.

摘要翻译： 为了扫描具有不同形状的锥形束（112,122）的物体，本发明提供具有可移动X射线管的CT扫描器（“在多个预定位置中移动x射线管”的含义也覆盖 使得阳极盘在多个对应位置之间移动，而X射线管的外壳不移动的情况）。 X射线管不仅可以沿轴向移动，而且可沿CT扫描仪台架的径向方向移动。 所述扫描器包括X射线管，所述X射线管还包括：阳极盘（100），包括多个焦点轨道（110,120），每个焦点轨道呈圆锥形，具有阳极角（114,124 ）不同于另一个焦点轨道的阳极角度; 以及第一阴极（210），被配置为发射靶向所述多个焦点轨道中的至少一个的电子束。 当不同的焦点轨道被电子束轰击时，产生具有不同形状的锥形束的不同的X射线束（112,122）。

公开(公告)号：US20130202166A1

公开(公告)日：2013-08-08

申请号：US13879655

申请日：2011-10-17

申请人： Thomas Koehler ,  Axel Thran

发明人： Thomas Koehler ,  Axel Thran

IPC分类号： G06T5/00

CPC分类号： G06T5/001 ,  G06T11/006 ,  G06T2211/421 ,  G06T2211/424

摘要： The invention relates to an imaging apparatus for imaging an object of interest. An analytical reconstruction unit (12) analytically reconstructs an analytical image of the object from detection data, in particular, from projection data, and an iterative reconstruction unit (13) iteratively reconstructs an iterative image of the object from the detection data, wherein a combination unit (14) combines the analytical image and the iterative image for generating a combination image. An iterative image can comprises shading artifacts, which may be caused by preprocessing the detection data before performing the iterative reconstruction. An analytical image shows reduced shading artifacts, in particular, shows no shading artifacts at all. Thus, by combining the analytical image and the iterative image a combination image can be generated, in which the shading artifacts are reduced in comparison to an iterative image, thereby improving the quality of the reconstructed final image of the object of interest.

摘要翻译： 本发明涉及一种用于对感兴趣对象进行成像的成像装置。 分析重建单元（12）特别是从投影数据中分析地从检测数据重建对象的分析图像，迭代重建单元（13）从检测数据中迭代地重建对象的迭代图像，其中组合 单元（14）组合分析图像和用于生成组合图像的迭代图像。 迭代图像可以包括遮蔽伪像，这可能是由于在执行迭代重构之前对检测数据进行预处理而引起的。 分析图像显示减少的着色伪像，特别是根本不显示阴影伪影。 因此，通过组合分析图像和迭代图像，可以生成组合图像，其中与迭代图像相比减少了阴影伪像，从而提高了感兴趣对象的重建的最终图像的质量。

公开(公告)号：US09165384B2

公开(公告)日：2015-10-20

申请号：US13978591

申请日：2011-12-29

申请人： Ewald Roessl ,  Thomas Koehler ,  Axel Thran

发明人： Ewald Roessl ,  Thomas Koehler ,  Axel Thran

IPC分类号： G06K9/00 ,  G06T11/00

CPC分类号： G06T11/003 ,  G06T11/006 ,  G06T2211/408 ,  G06T2211/424

摘要： The invention relates to an imaging system (30) for imaging an object. A projection data providing unit (31) provides acquired spectral projection data of an object comprising at least two components, and a reconstruction unit (10) iteratively reconstructs at least two final component images of the object by performing several iteration steps, in which at least two intermediate component images are updated based on the acquired spectral projection data and a penalty term, which is indicative of the correlated noise between the at least two intermediate component images. Since the at least two intermediate component images are updated based on the acquired spectral projection data and a penalty term, which is indicative of the correlated noise, correlated noise is penalized during the iterative reconstruction. The finally resulting component images of the object are therefore less corrupted by correlated noise and have an improved image quality.

摘要翻译： 本发明涉及一种用于对物体成像的成像系统（30）。 投影数据提供单元（31）提供包括至少两个分量的对象的获取的光谱投影数据，并且重建单元（10）通过执行几个迭代步骤来迭代地重构对象的至少两个最终分量图像，其中至少 基于所获取的光谱投影数据和惩罚项来更新两个中间分量图像，所述惩罚项指示所述至少两个中间分量图像之间的相关噪声。 由于基于所获取的频谱投影数据和指示相关噪声的罚分项来更新至少两个中间分量图像，所以在迭代重建期间相关噪声被惩罚。 因此，最终产生的对象的分量图像被相关噪声较少损坏并且具有改善的图像质量。

公开(公告)号：US20130287279A1

公开(公告)日：2013-10-31

申请号：US13978591

申请日：2011-12-29

申请人： Ewald Roessl ,  Thomas Koehler ,  Axel Thran

发明人： Ewald Roessl ,  Thomas Koehler ,  Axel Thran

IPC分类号： G06T11/00

CPC分类号： G06T11/003 ,  G06T11/006 ,  G06T2211/408 ,  G06T2211/424

摘要： The invention relates to an imaging system (30) for imaging an object. A projection data providing unit (31) provides acquired spectral projection data of an object comprising at least two components, and a reconstruction unit (10) iteratively reconstructs at least two final component images of the object by performing several iteration steps, in which at least two intermediate component images are updated based on the acquired spectral projection data and a penalty term, which is indicative of the correlated noise between the at least two intermediate component images. Since the at least two intermediate component images are updated based on the acquired spectral projection data and a penalty term, which is indicative of the correlated noise, correlated noise is penalized during the iterative reconstruction. The finally resulting component images of the object are therefore less corrupted by correlated noise and have an improved image quality.

摘要翻译： 本发明涉及一种用于对物体成像的成像系统（30）。 投影数据提供单元（31）提供包括至少两个分量的对象的获取的光谱投影数据，并且重建单元（10）通过执行几个迭代步骤来迭代地重构对象的至少两个最终分量图像，其中至少 基于所获取的光谱投影数据和惩罚项来更新两个中间分量图像，所述惩罚项指示所述至少两个中间分量图像之间的相关噪声。 由于基于所获取的频谱投影数据和指示相关噪声的罚分项来更新至少两个中间分量图像，所以在迭代重建期间相关噪声被惩罚。 因此，最终产生的对象的分量图像被相关噪声较少损坏并且具有改善的图像质量。

公开(公告)号：US09025838B2

公开(公告)日：2015-05-05

申请号：US13879655

申请日：2011-10-17

申请人： Thomas Koehler ,  Axel Thran

发明人： Thomas Koehler ,  Axel Thran

IPC分类号： G06K9/00 ,  G06T5/00 ,  G06T11/00

CPC分类号： G06T5/001 ,  G06T11/006 ,  G06T2211/421 ,  G06T2211/424

摘要： The invention relates to an imaging apparatus for imaging an object of interest. An analytical reconstruction unit (12) analytically reconstructs an analytical image of the object from detection data, in particular, from projection data, and an iterative reconstruction unit (13) iteratively reconstructs an iterative image of the object from the detection data, wherein a combination unit (14) combines the analytical image and the iterative image for generating a combination image. An iterative image can comprises shading artifacts, which may be caused by preprocessing the detection data before performing the iterative reconstruction. An analytical image shows reduced shading artifacts, in particular, shows no shading artifacts at all. Thus, by combining the analytical image and the iterative image a combination image can be generated, in which the shading artifacts are reduced in comparison to an iterative image, thereby improving the quality of the reconstructed final image of the object of interest.

摘要翻译： 本发明涉及一种用于对感兴趣对象进行成像的成像装置。 分析重建单元（12）特别是从投影数据中分析地从检测数据重建对象的分析图像，迭代重建单元（13）从检测数据中迭代地重建对象的迭代图像，其中组合 单元（14）组合分析图像和用于生成组合图像的迭代图像。 迭代图像可以包括遮蔽伪像，这可能是由于在执行迭代重构之前对检测数据进行预处理而引起的。 分析图像显示减少的着色伪像，特别是根本不显示阴影伪影。 因此，通过组合分析图像和迭代图像，可以生成组合图像，其中与迭代图像相比，阴影伪像被减少，从而提高感兴趣对象的重建的最终图像的质量。

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。

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。

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。

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。

公开(公告)号：US07924972B2

公开(公告)日：2011-04-12

申请号：US12471511

申请日：2009-05-26

申请人： Thomas Koehler ,  Michael Grass ,  Michael Harald Kuhn ,  Roland Proksa

发明人： Thomas Koehler ,  Michael Grass ,  Michael Harald Kuhn ,  Roland Proksa

IPC分类号： A61B6/03

CPC分类号： G06T7/20 ,  G06T11/005 ,  G06T2207/10081 ,  G06T2207/30048 ,  G06T2211/404 ,  G06T2211/412

摘要： In the CT imaging of non-homogeneously moving objects such as the heart or the coronary vessel tree, there is a problem that different parts of the objects are at rest at different points in time. Thus, a gated reconstruction with a globally selected time point does not yield a sharp image of such objects. According to the present invention, a motion of the object is estimated, describing the motion of selected regions of these objects. Then, on the basis of the estimated motion, time points are determined, where these areas have minimal motion. Then, an image is reconstructed, wherein the data from which the respective regions are reconstructed, correspond to the respective time points, where the regions have minimal motion. Due to this, an improved image quality may be provided.

摘要翻译： 在诸如心脏或冠状血管树之类的非均匀运动物体的CT成像中，存在不同部分的物体在不同时间点处于静止状态的问题。 因此，具有全局选择的时间点的门控重构不会产生这样的对象的清晰图像。 根据本发明，估计对象的运动，描述这些对象的选定区域的运动。 然后，在估计运动的基础上，确定这些区域具有最小运动的时间点。 然后，重建图像，其中各个区域被重构的数据对应于各个时间点，其中区域具有最小的运动。 由此，可以提供改善的图像质量。