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：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。

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。

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：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：US20130259191A1

公开(公告)日：2013-10-03

申请号：US13992302

申请日：2011-12-02

申请人： Thomas Koehler ,  Holger Schmidt ,  Roland Proksa

发明人： Thomas Koehler ,  Holger Schmidt ,  Roland Proksa

IPC分类号： A61B6/00

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。

公开(公告)号：US20120177274A1

公开(公告)日：2012-07-12

申请号：US13394819

申请日：2010-09-21

申请人： Thomas Koehler ,  Roland Proksa

发明人： Thomas Koehler ,  Roland Proksa

IPC分类号： G06K9/46

CPC分类号： G06T11/008 ,  G06T5/50 ,  G06T2211/421 ,  G06T2211/424

摘要： The invention relates to an image generation system for generating an image of a region of interest. The image generation system comprises a measured data providing unit for providing measured data of the region of interest, a reconstruction unit (12) for reconstructing a first and a second image of the region of interest from the measured data using a first and a second reconstruction method, a noise determination unit (13) for determining first and second noise values for first and second image elements of the first and second image, and an image element combining unit (14) for combining corresponding first and second image elements into combined image elements forming a combined image based on the first and second noise values. By combining corresponding image elements of two differently reconstructed images based on determined noise values, a combined image of a region of interest can be generated with an improved quality.

摘要翻译： 本发明涉及一种用于产生感兴趣区域的图像的图像生成系统。 图像生成系统包括测量数据提供单元，用于提供感兴趣区域的测量数据;重建单元（12），用于使用第一和第二重构从所测量的数据重构感兴趣区域的第一和第二图像 方法，用于确定第一和第二图像的第一和第二图像元素的第一和第二噪声值的噪声确定单元（13）和用于将对应的第一和第二图像元素组合成组合图像元素的图像元素合成单元（14） 基于第一和第二噪声值形成组合图像。 通过基于确定的噪声值组合两个不同重建图像的相应图像元素，可以以改进的质量生成感兴趣区域的组合图像。

公开(公告)号：US08184891B2

公开(公告)日：2012-05-22

申请号：US12445761

申请日：2007-10-12

申请人： Thomas Koehler ,  Roland Proksa

发明人： Thomas Koehler ,  Roland Proksa

IPC分类号： G06K9/00

CPC分类号： G06T11/005 ,  G06T2211/421

摘要： The present invention relates to an imaging system for imaging a region of interest comprising an illumination unit and a detection unit. The imaging system further comprises a grouping unit for grouping the detection values, wherein each group comprises at least one alpha detection value and at least one beta detection value (103). At least one alpha aperture weighting value for the at least one alpha detection value of a group is determined by using at least one position of at least one ray within the aperture (104). Furthermore, at least one beta aperture weighting value for the at least one beta detection value of a group is approximately determined using the at least one alpha aperture weighting value of the group (105). The detection values are than aperture weighted using aperture weighting values (106). The region of interest is reconstructed by backprojecting the weighted detection values (107).

摘要翻译： 本发明涉及一种用于对包括照明单元和检测单元的感兴趣区域成像的成像系统。 成像系统还包括用于对检测值进行分组的分组单元，其中每组包括至少一个α检测值和至少一个β检测值（103）。 通过使用孔径（104）内的至少一个射线的至少一个位置来确定组的至少一个α检测值的至少一个α孔径权重值。 此外，使用组（105）的至少一个阿尔法孔径权重值近似确定组的至少一个β检测值的至少一个β孔径加权值。 检测值比使用孔径加权值的孔径加权（106）。 通过反投影加权检测值来重建感兴趣区域（107）。

公开(公告)号：US07970195B2

公开(公告)日：2011-06-28

申请号：US11908294

申请日：2006-03-07

申请人： Andy Ziegler ,  Thomas Koehler ,  Roland Proksa

发明人： Andy Ziegler ,  Thomas Koehler ,  Roland Proksa

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  G06T2211/424

摘要： The invention relates to a device and a method for the iterative reconstruction of the attenuation coefficients μj in a tomographic image of an object (1) from projection measurements mi. In the update equation for μjn during the n-th iteration the backprojected error (mi−mi−(μjn)) is weighted by a voxel dependent factor Formula (I). Such a voxel dependent update may particularly be included in the algorithms of ART or ML.

摘要翻译： 本发明涉及一种用于从投影测量mi在物体（1）的断层图像中迭代重建衰减系数μj的装置和方法。 在第n次迭代期间的μjn的更新方程中，反投影误差（mi-mi-（μjn））由体素因子因子公式（I）加权。 这种体素相关更新可以特别地包括在ART或ML的算法中。

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。