公开(公告)号：US07570730B2

公开(公告)日：2009-08-04

申请号：US10598866

申请日：2005-03-07

申请人： Thomas Kohler ,  Claas Bontus

发明人： Thomas Kohler ,  Claas Bontus

IPC分类号： A61B6/03

CPC分类号： G06T11/005 ,  G01T1/1647 ,  Y10S378/901

摘要： Image quality is an important feature for CT scanning, in particular for helical cone-beam CT scanning. By using projection data acquired at two different positions of the focal spot of the radiation beam and rebinning that projection data from a first geometry to a second geometry the two sub-sets of projection data are combined to one rebinned projection data set, thereby improving the radial resolution of the data set. Advantageously, according to an aspect of the present invention, a further rebinning may be performed, from the second geometry back to the first geometry, therefore resulting in a projection data set in the initial geometry with a higher radial resolution.

摘要翻译： 图像质量是CT扫描的重要特征，特别是螺旋锥束CT扫描。 通过使用在辐射束的焦斑的两个不同位置处获取的投影数据，并将投影数据从第一几何重新组合到第二几何，将两个投影数据子集组合成一个重新投影的投影数据集，从而改善 数据集的径向分辨率。 有利地，根据本发明的一个方面，可以从第二几何体到第一几何形状进行进一步的重新组合，因此导致在初始几何形状中以更高的径向分辨率设置的投影数据。

公开(公告)号：US20080013676A1

公开(公告)日：2008-01-17

申请号：US11570101

申请日：2005-06-09

申请人： Claas Bontus ,  Thomas Kohler

发明人： Claas Bontus ,  Thomas Kohler

IPC分类号： G01N23/00 ,  G06K9/00

CPC分类号： A61B6/4042 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4085 ,  G06T11/005

摘要： The invention relates to a helical cone beam computed tomography method wherein a radiation source moves along a helical trajectory with respect to an object in a nPi relative movement. Measured values are partially differentiated with respect to the angular position of the radiation source on the helical trajectory, and intermediate filter values are generated by filtering along filter lines with a κ-filter. Each of the intermediate filter values is multiplied by a filter factor wherein the filter factor for intermediate filter values, which have been generated by filtering along filter lines running only within the Pi window, is larger than or equal to filter factors, by which intermediate filter values are multiplied, which have been generated by filtering along filter lines running within and outside the Pi window. Intermediate filter values generated for a measured value are added to a final filter value, and the final filter values are back projected to reconstruct an image of the object.

摘要翻译： 本发明涉及一种螺旋锥束计算机断层摄影方法，其中辐射源相对于nPi相对运动中的物体沿着螺旋轨迹移动。 相对于螺旋轨迹上的辐射源的角位置，测量值被部分地区分，并且通过使用κ过滤器沿着滤波器线进行滤波来生成中间滤波器值。 每个中间滤波器值乘以滤波器因子，其中通过仅在Pi窗口内运行的滤波器线进行滤波而产生的中间滤波器值的滤波器因子大于或等于滤波器因数，中间滤波器 通过对在Pi窗口内外运行的滤波器线进行滤波生成值。 为测量值生成的中间过滤器值被添加到最终过滤器值，并且返回最后的过滤器值以重建对象的图像。

公开(公告)号：US20080095299A1

公开(公告)日：2008-04-24

申请号：US10598866

申请日：2005-03-07

申请人： Thomas Kohler ,  Claas Bontus

发明人： Thomas Kohler ,  Claas Bontus

IPC分类号： G06T11/00 ,  G06T9/00

CPC分类号： G06T11/005 ,  G01T1/1647 ,  Y10S378/901

摘要： Image quality is an important feature for CT scanning, in particular for helical cone-beam CT scanning. By using projection data acquired at two different positions of the focal spot of the radiation beam and rebinning that projection data from a first geometry to a second geometry the two sub-sets of projection data are combined to one rebinned projection data set, thereby improving the radial resolution of the data set. Advantageously, according to an aspect of the present invention, a further rebinning may be performed, from the second geometry back to the first geometry, therefore resulting in a projection data set in the initial geometry with a higher radial resolution.

摘要翻译： 图像质量是CT扫描的重要特征，特别是螺旋锥束CT扫描。 通过使用在辐射束的焦斑的两个不同位置处获取的投影数据，并将投影数据从第一几何重新组合到第二几何，将两个投影数据子集组合成一个重新投影的投影数据集，从而改善 数据集的径向分辨率。 有利地，根据本发明的一个方面，可以从第二几何体到第一几何形状进行进一步的重新组合，因此导致在初始几何形状中以更高的径向分辨率设置的投影数据。

公开(公告)号：US07430270B2

公开(公告)日：2008-09-30

申请号：US11570101

申请日：2005-06-09

申请人： Claas Bontus ,  Thomas Kohler

发明人： Claas Bontus ,  Thomas Kohler

IPC分类号： H05G1/60

CPC分类号： A61B6/4042 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4085 ,  G06T11/005

摘要： The invention relates to a computerized tomography method, wherein a radiation source executes an nPi relative movement along a helix with respect to an object. Acquired measured values are partially derived according to the angular position of the radiation source on the helix and intermediate filter values are generated by filtering the derived measured values along the filter lines with a k filter. Each intermediate filter value is multiplied by a filter factor, where the filter factor for intermediate filter values that have been generated by filtering the derived measured values along filter lines, which run exclusively within the Pi window, is greater than or equal to those filter factors by which the intermediate filter values are multiplied, which have been generated by filtering the derived measured values along filter lines, which run inside as well as outside the Pi window. The intermediate filter values assigned to a measured value are added to a filter value and the filter values are back-projected for reconstruction of a CT image.

摘要翻译： 本发明涉及一种计算机断层摄影方法，其中辐射源相对于物体沿螺旋线执行nPi相对运动。 获得的测量值根据辐射源在螺旋上的角位置被部分地导出，并且通过用k滤波器对沿滤波器线的导出的测量值进行滤波来生成中间滤波器值。 每个中间滤波器值乘以一个滤波器因子，其中通过滤波器线产生的中间滤波器值的滤波因子，该滤波器值仅在Pi窗口内运行，大于或等于那些滤波器因子 通过它们乘以中间滤波器值，其通过沿着沿窗口内部以及外部的滤波器线过滤导出的测量值而产生。 分配给测量值的中间滤波器值被添加到滤波器值，并且滤波器值被反投影用于重建CT图像。

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。

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。

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。

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。

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.

公开(公告)号：US20100296624A1

公开(公告)日：2010-11-25

申请号：US12445765

申请日：2007-10-16

申请人： Claas Bontus ,  Roland Proksa ,  Thomas Koehler

发明人： Claas Bontus ,  Roland Proksa ,  Thomas Koehler

IPC分类号： A61B6/03

CPC分类号： A61B6/503 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4021 ,  A61B6/4085 ,  A61B6/541

摘要： If, in cardiac CT, the time window becomes shorter than the time required for a complete rotation of the gantry, the volume that can be reconstructed becomes small due to the non-existence of related pi-lines. According to an exemplary embodiment of the present invention, an examination apparatus is provided which generates a radiation beam oscillating in z-direction with an oscillation frequency higher than the rotational frequency of the source. This may provide for an exact image reconstruction of large volumes.

摘要翻译： 如果在心脏CT中，时间窗口变得比台架完全旋转所需的时间短，则由于不存在相关的pi线，可重构的体积变小。 根据本发明的示例性实施例，提供了一种检查装置，其产生以比源的旋转频率高的振荡频率在z方向上振荡的辐射束。 这可以提供大体积的精确图像重建。