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31. 发明申请

US20100232663A1 COMPUTED TOMOGRAPHY RECONSTRUCTION FOR TWO TILTED CIRCLES 审中-公开
标题翻译：用于两个倾斜圆周的计算机图像重建
公开(公告)号：US20100232663A1
公开(公告)日：2010-09-16
申请号：US12377910
申请日：2007-07-24
申请人： Claas Bontus
发明人： Claas Bontus
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , A61B6/027 , A61B6/508 , G06T2211/416 , G06T2211/421
摘要： A computed tomography apparatus (10) acquires projection data along a trajectory which includes first (50) and second (50′) tilted circles. A reconstructor (22), includes a differentiator (24), a filter (26), and a backprojector (27). The filter (26) applies a filter function which varies according to a location (x) which is to be reconstructed. The parameters of the filter function are selected so that the reconstructor (22) performs an exact filtered backprojection.
摘要翻译：计算机断层摄影装置（10）沿着包括第一（50）和第二（50'）倾斜圆的轨迹获取投影数据。重建器（22）包括微分器（24），过滤器（26）和后投影仪（27）。滤波器（26）应用根据要重建的位置（x）而变化的滤波器函数。选择滤波器函数的参数，使得重构器（22）执行精确滤波的反投影。

32. 发明授权

US07672490B2 Motion artifacts compensation 失效
标题翻译：运动假象补偿
公开(公告)号：US07672490B2
公开(公告)日：2010-03-02
申请号：US10597871
申请日：2005-02-04
申请人： Thomas Kohler , Roland Proksa , Claas Bontus
发明人： Thomas Kohler , Roland Proksa , Claas Bontus
IPC分类号： G06K9/00 , A61B6/00 , A61B5/05
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/412
摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.
摘要翻译：运动是螺旋锥束CT中最重要的文物来源之一。通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。

33. 发明申请

US20080205727A1 Computed Tomography Method With Helical Relative Movement And Conical Beam Bundle 失效
标题翻译：计算机断层扫描方法与螺旋相对运动和锥形束束
公开(公告)号：US20080205727A1
公开(公告)日：2008-08-28
申请号：US11815606
申请日：2006-01-31
申请人： Claas Bontus , Michael Grass , Thomas Kohler
发明人： Claas Bontus , Michael Grass , Thomas Kohler
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/421
摘要： The invention relates to a computed tomography method in which a periodically moving object is irradiated by a conical beam bundle. An nPi-relative movement is generated between a radiation source, which generates the conical beam bundle, and the object. During the nPi-relative movement, measured values are acquired, which depend on the intensity in the beam bundle on the other side of the object and from these measured values filter values are determined, which are divided into different groups. The filter values of at least one group are weighted in dependence on the movement of the object, wherein, when filter values of several groups are weighted, filter values of different groups are weighted differently in dependence on the movement of the object. Finally, a CT image of the object is reconstructed from the filter values.
摘要翻译：本发明涉及一种计算机断层摄影方法，其中周期性移动的物体被锥形束束照射。在产生锥形束束的辐射源和物体之间产生nPi相对运动。在nPi相对运动期间，获取测量值，其取决于物体另一侧上的束束中的强度，并且从这些测量值确定滤波器值，其被划分为不同的组。根据对象的移动对至少一个组的滤波器值进行加权，其中当对多个组的滤波器值进行加权时，根据对象的移动对不同组的滤波器值进行加权不同。最后，从过滤器值重建对象的CT图像。

34. 发明申请

US20070177713A1 Motion artifacts compensation 失效
标题翻译：运动假象补偿
公开(公告)号：US20070177713A1
公开(公告)日：2007-08-02
申请号：US10597871
申请日：2005-02-04
申请人： Thomas Kohler , Roland Proksa , Claas Bontus
发明人： Thomas Kohler , Roland Proksa , Claas Bontus
IPC分类号： H05G1/60 , G06K9/00 , G01N23/00 , G21K1/12
CPC分类号： G06T11/005 , A61B6/027 , G06T2211/412
摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.
摘要翻译：运动是螺旋锥束CT中最重要的文物来源之一。通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。

35. 发明申请

US20070140410A1 Coherent-scatter computed tomography 失效
标题翻译：相干散射计算机断层扫描
公开(公告)号：US20070140410A1
公开(公告)日：2007-06-21
申请号：US10575584
申请日：2004-10-05
申请人： Udo Van Stevendaal , Claas Bontus , Peter Forthmann
发明人： Udo Van Stevendaal , Claas Bontus , Peter Forthmann
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/416 , Y10S378/901
摘要： Known reconstruction techniques from coherent scattered x-rays apply non-exact reconstruction techniques. According to the present invention, a relatively wide spectrum of wave-vector transfers q of the scattered x-ray photons is acquired. The projection data is interpreted as line integrals in the x y-q space and the projection data is resorted to correspond to an acquisition along any source trajectory. Due to this, an exact helical reconstruction algorithms may be applied and redundant data may be used to obtain a better image quality.
摘要翻译：来自相干散射X射线的已知重建技术应用非精确重建技术。根据本发明，获得了散射的x射线光子的相对宽的波矢量传输q。投影数据被解释为x y-q空间中的线积分，并且投影数据被用来对应于沿着任何源轨迹的获取。因此，可以应用精确的螺旋重建算法，并且可以使用冗余数据来获得更好的图像质量。

36. 发明申请

US20070019776A1 Computer tomography method using a cone-shaped bundle of rays 失效
标题翻译：计算机断层扫描法使用锥形束光束
公开(公告)号：US20070019776A1
公开(公告)日：2007-01-25
申请号：US10570088
申请日：2004-08-23
申请人： Claas Bontus , Thomas Kohler , Michael Grass
发明人： Claas Bontus , Thomas Kohler , Michael Grass
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： A61B6/5217 , A61B6/027 , A61B6/032 , A61B6/4028 , A61B6/5264 , A61B6/527 , A61B6/541 , G06T11/005 , G06T11/006 , G06T2211/412
摘要： The invention relates to a computer tomography method in which an examination area is passed through by a cone-shaped bundle of rays. The bundle of rays comes from a radiation source location which moves around the examination area on an overall trajectory. The overall trajectory consists of a first, closed partial trajectory, at least one second, closed partial trajectory and at least one third partial trajectory which connects the first and the at least one second partial trajectories to one another. Measured values which depend on the intensity in the bundle of rays on the other side of the examination area are acquired by means of a detector unit while the radiation source location is moving on the overall trajectory, and a CT image of the examination area is reconstructed from these measured values.
摘要翻译：本发明涉及一种计算机断层摄影方法，其中检查区域通过锥形束的光束通过。一束光线来自在总体轨迹上围绕检查区域移动的辐射源位置。整个轨迹由第一，闭合的部分轨迹，至少一个第二，闭合的部分轨迹和至少一个将第一和第二部分轨迹相互连接的第三部分轨迹组成。在辐射源位置在整个轨迹上移动的同时，通过检测器单元获取取决于检查区另一侧的光线束强度的测量值，并且重建检查区域的CT图像从这些测量值。

37. 发明申请

US20060039525A1 Method and apparatus for exact cone beam computed tomography 失效
公开(公告)号：US20060039525A1
公开(公告)日：2006-02-23
申请号：US10534158
申请日：2003-11-03
申请人： Claas Bontus , Thomas Kohler
发明人： Claas Bontus , Thomas Kohler
IPC分类号： A61B6/00 , H05G1/60
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/416 , G06T2211/421 , Y10S378/901
摘要： The invention relates to a computed tomography method in which an examination zone is irradiated along a helical trajectory by a conical radiation beam. The radiation transmitted by the examination zone is measured by means of a detector unit and therefrom the absorption distribution in the examination zone is reconstructed without approximations. The reconstruction comprises a derivation of the measuring values of parallel rays of different projections, an integration of these values along K lines, a weighting of these values and a back projection.

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