公开(公告)号：US20070053482A1

公开(公告)日：2007-03-08

申请号：US10564572

申请日：2004-07-07

申请人： Thomas Kohler ,  Michael Grass ,  Michael Kuhn ,  Roland Proksa

发明人： Thomas Kohler ,  Michael Grass ,  Michael Kuhn ,  Roland Proksa

IPC分类号： A61B6/00 ,  G01N23/00 ,  G21K1/12 ,  H05G1/60

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 objects 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 qualify maybe 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。 因此，可以提供改进的图像资格。

公开(公告)号：US20060203955A1

公开(公告)日：2006-09-14

申请号：US10552399

申请日：2004-04-02

申请人： Thomas Kohler ,  Michael Grass ,  Roland Proksa

发明人： Thomas Kohler ,  Michael Grass ,  Roland Proksa

IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00

CPC分类号： A61B6/541 ,  A61B5/1135 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/503 ,  A61B6/504

摘要： The invention relates to a computer tomography method in which a periodically moving object, in particular an organ of the body, is irradiated by a cone-shaped beam cluster (4) along a trajectory which runs on a cylindrical surface. The radiation transmitted through the object is measured by means of a detector unit (16), and at the same time the periodic movement of the object is recorded. In order to reconstruct the absorption distribution of the object, the measured values or the corresponding beams are rebinned to form a number of parallel projections, where for each of these projections a measured value is determined whose beam irradiates the object. The point in time at which this measured value was acquired is allocated to the respective projection. For the reconstruction, which may for example be carried out using a filtered back-projection, only projections whose allocated points in time lie within a predefined, specific time range (H1) within a period of the object movement are used.

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，特别是身体的脏器被沿着在圆柱形表面上运行的轨迹由锥形束簇（4）照射。 通过检测器单元（16）测量透过物体的辐射，同时记录物体的周期性运动。 为了重建物体的吸收分布，将测量值或相应的光束重新组合以形成多个平行投影，其中对于这些投影中的每一个，确定其光束照射物体的测量值。 将获取该测量值的时间点分配给相应的投影。 对于可以例如使用滤波反投影来进行的重建，仅使用其分配的时间点在物体移动的时段内在预定义的特定时间范围（H 1）内的投影。

公开(公告)号：US20090232379A1

公开(公告)日：2009-09-17

申请号：US12471511

申请日：2009-05-26

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

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

IPC分类号： G06K9/00

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。

公开(公告)号：US20070003132A1

公开(公告)日：2007-01-04

申请号：US10555576

申请日：2004-04-26

申请人： Roland Proksa ,  Thomas Kohler

发明人： Roland Proksa ,  Thomas Kohler

IPC分类号： G06K9/00 ,  H05G1/60

CPC分类号： G06T11/006 ,  G06T2211/424

摘要： The invention relates to an iterative method of determining a spatial distribution of values of a property of an object, and particularly values of its absorption, in an examination region, on the basis of measured values that values are acquired with a measuring device, and particularly with a computer tomograph. The reliability of each measured value is taken into account when this is done. The measured values can each be represented as a sum of values of the property that have each been multiplied by a proportional factor, the proportional factor being a measure of the proportion that a value of the property forms of the measured value. Each value of the property is approached by one iteration value at a time by setting each iteration value to a starting value and, in an iteration step, generating for each measured value a reference measured value, forming the difference between each reference measured value and the corresponding measured value, and multiplying this difference by a reliability parameter and projecting it backward into the examination region.

摘要翻译： 本发明涉及一种迭代方法，其基于测量值用测量装置获取的测量值，确定在检查区域中物体的性质的值的空间分布，特别是其吸收的值，特别是 用计算机断层扫描仪。 当完成时，会考虑每个测量值的可靠性。 测量值可以各自表示为每个乘以比例因子的性质的值的和，比例因子是测量值的属性形式的值的比例的度量。 通过将每个迭代值设置为起始值，通过将每个迭代值设置为起始值，将属性的每个值接近一个迭代值，并且在迭代步骤中，为每个测量值生成参考测量值，从而形成每个参考测量值与 相应的测量值，并将该差乘以可靠性参数并将其向后投影到检查区域。

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：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：US20080205729A1

公开(公告)日：2008-08-28

申请号：US11908294

申请日：2006-03-07

申请人： Andy Ziegler ,  Thomas Kohler ,  Roland Proksa

发明人： Andy Ziegler ,  Thomas Kohler ,  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射测量m 1 i中的对象（1）的断层图像中迭代重建衰减系数μn j i i的装置和方法。 在第n次迭代期间，对于mu n 的更新等式，反向投影的误差（m i） 通过体素依赖因子公式（I）加权 - （mu＆lt; j＆lt; n＆gt; n＆gt;））。 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：US20080187195A1

公开(公告)日：2008-08-07

申请号：US11911214

申请日：2006-04-10

申请人： Thomas Kohler ,  Roland Proksa ,  Andy Ziegler

发明人： Thomas Kohler ,  Roland Proksa ,  Andy Ziegler

IPC分类号： G06K9/00

CPC分类号： G06T11/008 ,  G06T11/006

摘要： The invention relates to an examination apparatus with an X-ray device (10) for circular or helical cone-beam CT acquisition of projections images (Pi(E1), Pi(E2)) of a patient (1) with different energy spectra (E1, E2) and/or with an energy-resolved detection. By a combination of the projections, images (Ibone,i, Itissue,i) can be calculated that show predominantly the bone structure and the soft tissue, respectively. Therefore, a 3D model (Mbone) of the bone structure and a 3D model (Mtissue) of the tissue can be reconstructed separately. After removal of artifacts from the bone-structure model (Mbone), both separate 3D models can be integrated to a combined model (M) of the body volume with a high image quality.

摘要翻译： 本发明涉及一种具有X射线装置（10）的检查装置，用于对投影图像进行圆形或螺旋锥束CT采集（P 1） 具有不同能量谱的患者（1）的患者（1）的患者（E 2） >）和/或能量分辨检测。 通过投影的组合，可以分别计算主要表现为骨骼结构和软组织的图像（I骨，I，I，I组织，i）。 因此，可以分别重建组织的骨骼结构的3D模型（M＆gt;骨头）和3D模型（M＆gt;组织）。 在从骨结构模型（骨骼）中去除人造物之后，两个分开的3D模型可以被整合到具有高图像质量的身体体积的组合模型（M）上。

公开(公告)号：US20060159327A1

公开(公告)日：2006-07-20

申请号：US10560454

申请日：2004-06-07

申请人： Thomas Kohler ,  Roland Proksa

发明人： Thomas Kohler ,  Roland Proksa

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/416

摘要： The invention relates to a computer tomography method in which a radiation source moves relative to an examination region along, in particular, a helical or circular trajectory. Measured values are acquired by a detector unit and a CT image of the examination region is reconstructed from these measured values. In the reconstruction, a complementary measured value, whose ray is oriented parallel to the ray of the respective measured value that has been acquired but in the opposite direction thereto, is determined for each of at least some measured values that lie within a reconstruction window. Redundant measured values are used to calculate the complementary measured values, with the help in particular of John's equation. The measured values for which complementary measured values have been determined are each replaced by a sum comprised a measured value that has been weighted and a complementary measured value that has been weighted, and a CT image is reconstructed, in particular by an exact method of reconstruction, from the replacement measured values, and where appropriate from acquired measured values, that lie within the reconstruction window.

摘要翻译： 本发明涉及一种计算机断层摄影方法，其中辐射源相对于沿着特别是螺旋或圆形轨迹的检查区域移动。 通过检测器单元获取测量值，并从这些测量值重建检查区域的CT图像。 在重建中，对于位于重建窗口内的至少一些测量值中的每一个确定其光线平行于已经获取但与其相反方向的相应测量值的射线的互补测量值。 冗余测量值用于计算补充测量值，特别是约翰方程式的帮助。 已经确定了互补测量值的测量值各自被包括被加权的测量值和已经加权的测量值和重建CT图像的和，特别是通过重建的精确方法 ，从替换测量值，并在适当时从获得的测量值，位于重建窗口内。

公开(公告)号：US20090074129A1

公开(公告)日：2009-03-19

申请号：US11719305

申请日：2005-11-07

申请人： Thomas Kohler ,  Michael Grass

发明人： Thomas Kohler ,  Michael Grass

IPC分类号： A61B6/03

CPC分类号： A61B6/541 ,  A61B6/032 ,  A61B6/4085

摘要： The invention relates to a computer tomography method for the detection of a cyclically moved object in an examination zone. First, after the acquisition of the measured values, a rough image of the examination zone is reconstructed from which a region relevant for the further method is selected. For the generation of an image with reduced motion artifacts or improved temporal resolution, reconstruction windows in predefinable position are used, which are optimized in such a way that they are, on the one hand, smallest possible, on the other hand, however, sufficiently large, to be able to reconstruct all voxels of this region. Only measured values acquired within the reconstruction windows are taken into account for the reconstruction of a CT image of the region.

摘要翻译： 本发明涉及一种用于在检查区域中检测循环移动物体的计算机断层摄影方法。 首先，在获取测量值之后，重建检查区域的粗略图像，从中选择与该另一方法相关的区域。 为了产生具有减少的运动伪影或改进的时间分辨率的图像，使用可预定义位置的重建窗口，其以这样的方式被优化：一方面，尽管如此，另一方面，足够的 大，能够重建这个地区的所有体素。 仅在重建窗口中获取的测量值被考虑用于重建该区域的CT图像。