公开(公告)号：US08606038B2

公开(公告)日：2013-12-10

申请号：US13358624

申请日：2012-01-26

申请人： Harald Schöndube ,  Karl Stierstorfer

发明人： Harald Schöndube ,  Karl Stierstorfer

IPC分类号： G06K9/40 ,  G06K9/00 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12 ,  H05G1/60

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/5258 ,  G06T5/005 ,  G06T2207/10081 ,  G06T2207/20032

摘要： A method and computer system are disclosed with software for artifact reduction in CT image datasets for spiral scans from a CT system with an inclined gantry. In at least one embodiment, for each of at least two positions of the center of rotation, which is moved during the spiral scan, the removal of annular artifacts is carried out around these positions, during which the position concerned is used as the center point of the annular artifacts to be removed.

摘要翻译： 公开了一种方法和计算机系统，其具有用于从具有倾斜机架的CT系统进行螺旋扫描的CT图像数据集中的伪像减少的软件。 在至少一个实施例中，对于在螺旋扫描期间移动的旋转中心的至少两个位置中的每一个，围绕这些位置执行环形伪像的去除，在该位置期间，将所述位置用作中心点 要除去的环形假象。

公开(公告)号：US08306304B2

公开(公告)日：2012-11-06

申请号：US12462000

申请日：2009-08-31

申请人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

发明人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

IPC分类号： A61B6/03

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4441 ,  A61B6/507 ,  A61B6/5205 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421

摘要： At least one embodiment of the invention relates to a method for the reconstruction of image data of an examined object from measuring data, wherein the measuring data were detected by a detector within and outside of its Tam-Danielsson window during a relative spiral movement between a radiation source of a computer tomography system and the examined object. As a result of the spiral movement, the measuring data outside of the Tam-Danielsson contain interruptions. A mathematically precise first reconstruction of first image data is realized in at least one embodiment based on the measuring data by using only measuring data from the Tam-Danielsson window. A mathematically precise second reconstruction is furthermore realized of second image data from the measuring data in at least one embodiment, using at least among other things measuring data from outside of the Tam-Danielsson window, wherein the interruption of the measuring data is compensated for by using existing measuring data and/or the first image data and/or other image data obtained from existing measuring data. Finally, the first image data and the second image data are combined.

摘要翻译： 本发明的至少一个实施例涉及一种用于从测量数据重建被检查对象的图像数据的方法，其中在其Tam-Danielsson窗口内外的检测器检测测量数据， 计算机断层摄影系统的辐射源和检查对象。 由于螺旋运动，Tam-Danielsson以外的测量数据包含中断。 在至少一个实施例中，通过仅使用来自Tam-Danielsson窗口的测量数据，基于测量数据来实现第一图像数据的数学上精确的第一重建。 在至少一个实施例中，使用至少测量来自Tam-Danielsson窗口外部的数据的测量数据的中断，至少在其中测量来自测量数据的第二图像数据的数学上精确的第二重构，其中测量数据的中断由 使用现有测量数据和/或从现有测量数据获得的第一图像数据和/或其他图像数据。 最后，组合第一图像数据和第二图像数据。

公开(公告)号：US20120195483A1

公开(公告)日：2012-08-02

申请号：US13358624

申请日：2012-01-26

申请人： Harald Schöndube ,  Karl Stierstorfer

发明人： Harald Schöndube ,  Karl Stierstorfer

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/5258 ,  G06T5/005 ,  G06T2207/10081 ,  G06T2207/20032

摘要： A method and computer system are disclosed with software for artifact reduction in CT image datasets for spiral scans from a CT system with an inclined gantry. In at least one embodiment, for each of at least two positions of the center of rotation, which is moved during the spiral scan, the removal of annular artifacts is carried out around these positions, during which the position concerned is used as the center point of the annular artifacts to be removed.

摘要翻译： 公开了一种方法和计算机系统，其具有用于从具有倾斜机架的CT系统进行螺旋扫描的CT图像数据集中的伪像减少的软件。 在至少一个实施例中，对于在螺旋扫描期间移动的旋转中心的至少两个位置中的每一个，围绕这些位置执行环形伪像的去除，在该位置期间，将所述位置用作中心点 要除去的环形假象。

公开(公告)号：US20110268335A1

公开(公告)日：2011-11-03

申请号：US13098530

申请日：2011-05-02

申请人： Holger Kunze ,  Harald Schöndube ,  Karl Stierstorfer

发明人： Holger Kunze ,  Harald Schöndube ,  Karl Stierstorfer

IPC分类号： G06K9/00 ,  A61B6/03

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4441 ,  A61B6/482 ,  A61B6/507 ,  A61B6/5205 ,  A61B6/5258 ,  A61B6/5264 ,  A61B6/5288 ,  A61B6/541 ,  G06T11/006 ,  G06T2211/424 ,  G06T2211/436

摘要： A method is disclosed for the reconstruction of image data of a moving object to be examined from measurement data, wherein the measurement data has previously been established in a relative rotational movement between a radiation source of a computed tomography system and the object to be examined. In at least one embodiment, first image data is reconstructed from an incomplete measurement data record by way of an iterative algorithm, wherein in the iterative reconstruction a dimension is used which contains probability information relating to pixel values of the image data to be reconstructed.

摘要翻译： 公开了一种用于从测量数据重建要检查的移动物体的图像数据的方法，其中测量数据先前已经在计算机断层摄影系统的辐射源和待检查对象之间的相对旋转运动中建立。 在至少一个实施例中，通过迭代算法从不完整的测量数据记录重建第一图像数据，其中在迭代重建中使用包含与要重构的图像数据的像素值有关的概率信息的维度。

公开(公告)号：US08050480B2

公开(公告)日：2011-11-01

申请号：US12453911

申请日：2009-05-27

申请人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

发明人： Frédéric Noo ,  Harald Schöndube ,  Karl Stierstorfer

IPC分类号： G06K9/00 ,  A61B6/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/416 ,  G06T2211/421

摘要： A method is disclosed for generating computed tomography image data of a volume of interest from X-ray CT data sets generated by a computed tomography system during scanning of an examination subject on a helical path rotating around a longitudinal system axis in the infeed direction. In at least one embodiment, at least two volume-based reconstructions of the volume of interest are performed by way of differential back-projection over surfaces constituted by different groups of M-lines, followed in each case by an inverse Hilbert transformation. The method further includes combining different reconstructed volumes to form a final reconstruction of the volume of interest.

摘要翻译： 公开了一种用于在扫描受试者的扫描期间由计算机断层摄影系统生成的X射线CT数据集的计算机断层摄影图像数据的生成的方法，所述X射线CT数据集沿着在进给方向上围绕纵向系统轴线旋转的螺旋路径。 在至少一个实施例中，通过在由不同M行组组成的表面上的差异背投影来执行感兴趣体积的至少两个基于体积的重建，然后在每种情况下通过反希尔伯特变换。 该方法还包括组合不同的重建体积以形成感兴趣体积的最终重建。

公开(公告)号：US20110121191A1

公开(公告)日：2011-05-26

申请号：US12953539

申请日：2010-11-24

申请人： Steffen KAPPLER ,  Karl Stierstorfer

发明人： Steffen KAPPLER ,  Karl Stierstorfer

IPC分类号： G01T1/24

CPC分类号： G01T1/17

摘要： A circuit arrangement of a quanta-counting detector with a multiplicity of detector elements is disclosed, wherein the X-ray quanta registered in each detector element generate a signal profile. In at least one embodiment, the circuit arrangement, in each detector element, includes: at least one first comparator with a first energy threshold lying in the energy range of the measured X-ray quanta and at least one second comparator with a second energy threshold lying above the energy range of the measured X-ray quanta, the at least one first and second comparators being connected to the detector element. Further, the at least two comparators have a logical interconnection, wherein at least a first comparator and a second comparator are connected to the inputs of an XOR gate, and each XOR gate connected to a first comparator is connected to precisely one edge-sensitive counter. Further, in at least one embodiment, an application-specific integrated circuit (ASIC) and an emitter-detector system of an X-ray CT system, including at least one circuit arrangement, are disclosed.

摘要翻译： 公开了具有多个检测器元件的量子计数检测器的电路布置，其中登记在每个检测器元件中的X射线量子产生信号轮廓。 在至少一个实施例中，每个检测器元件中的电路装置包括：具有第一能量阈值的至少一个第一比较器，其位于测量的X射线量子的能量范围内，并且至少一个第二比较器具有第二能量阈值 位于测量的X射线量子的能量范围之上，所述至少一个第一和第二比较器连接到检测器元件。 此外，至少两个比较器具有逻辑互连，其中至少第一比较器和第二比较器连接到异或门的输入，并且连接到第一比较器的每个异或门精确连接到一个边缘敏感计数器 。 此外，在至少一个实施例中，公开了包括至少一个电路装置的X射线CT系统的专用集成电路（ASIC）和发射极 - 检测器系统。

公开(公告)号：US07738686B2

公开(公告)日：2010-06-15

申请号：US11147186

申请日：2005-06-08

申请人： Herbert Bruder ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Karl Stierstorfer

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  A61B6/027

摘要： A method is for generating tomograms of a cyclically and complexly moving examination object using a tomography unit that reconstructs tomograms in at least one slice plane from detector output data. At least two tomograms from different phases of the movement cycle of the examination object are reconstructed in the region of at least one slice plane. The tomograms are subdivided automatically into subregions with good and bad image quality, and at least one complete tomogram is assembled from subregions with relatively good image quality per slice plane.

摘要翻译： 一种用于使用断层摄影单元产生循环和复杂移动的检查对象的断层图像的方法，所述断层摄影单元从检测器输出数据重建至少一个切片平面中的断层图像。 在至少一个切片平面的区域中重建来自检查对象的移动周期的不同阶段的至少两个断层图像。 断层图像被自动细分为具有良好和不良图像质量的子区域，并且至少一个完整的断层图像从具有相对较好的每个切片平面图像质量的子区域组装。

公开(公告)号：US07653171B2

公开(公告)日：2010-01-26

申请号：US11806166

申请日：2007-05-30

申请人： Holger Kunze ,  Karl Stierstorfer

发明人： Holger Kunze ,  Karl Stierstorfer

IPC分类号： A61B6/03

CPC分类号： G06T11/006 ,  A61B6/466

摘要： A method is disclosed for image reconstruction of an object with the aid of at least one-dimensional projections of the object into a three-dimensional volume image data record, it being possible to generate the projections by at least one detector/source system with reference to different positions and angles relative to the object, and at least two projections forming a reconstruction volume in an overlap region as basis for a backprojection of the projections into the three-dimensional volume image data record, in particular computed tomography. An apparatus for carrying out the method is further disclosed. In at least one embodiment, supplemented reconstruction volumes are generated by supplementing reconstruction volumes, covered only partially by projections, by way of virtual projections that are derived from volume image data records. By comparison with reconstruction volumes that are merely interpolated, supplementing a reconstruction volume with the aid of virtual projections can decisively improve the image quality of the computed tomography images that are backprojected therefrom.

摘要翻译： 公开了一种借助于物体的至少一维投影到三维体积图像数据记录中的对象的图像重建的方法，可以由具有参考的至少一个检测器/源系统产生投影 至少两个突起，形成重叠区域中的重建体积，作为将投影反投影到三维体积图像数据记录，特别是计算机断层摄影中的基础。 进一步公开了一种用于执行该方法的装置。 在至少一个实施例中，通过补充由体积图像数据记录导出的虚拟投影来补充仅部分由投影部分覆盖的重建体积来生成补充的重建体积。 通过与仅内插的重建体积进行比较，借助于虚拟投影来补充重建体积可以有效地改善从其反向投影的计算机断层摄影图像的图像质量。

公开(公告)号：US20090324045A1

公开(公告)日：2009-12-31

申请号：US12457972

申请日：2009-06-26

申请人： Michael Grasruck ,  Karl Stierstorfer ,  Johan Sunnegardh

发明人： Michael Grasruck ,  Karl Stierstorfer ,  Johan Sunnegardh

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  G06T2211/424

摘要： A method is disclosed for reconstructing CT image data. In at least one embodiment, the method includes providing measured CT projection data p based on the CT projection data p, reconstructing first CT image data fk=1, and on the basis of the first image data fk=1 iteratively generating k+1-th CT-image data according to the formula: fk+1=fk−α(Q(Pfk−p)+βR(fk)) until the standard ∥fk+1−fk∥2 is ≦n, with the reconstruction operator Q containing a noise weighting according to Q=B·Wstatist.·H. Aside from suppressing “cone” artifacts, the proposed method of at least one embodiment indicates a significant reduction in the image noise even after a few iterations.

摘要翻译： 公开了一种重建CT图像数据的方法。 在至少一个实施例中，该方法包括基于CT投影数据p提供测量的CT投影数据p，重建第一CT图像数据fk = 1，并且基于第一图像数据fk = 1迭代地生成k + 直到标准∥fk+ 1-fk‖2为<= n，与重建算子相对应，根据以下公式fk + 1 = fk-α（Q（Pfk-p）+βR（fk））的CT图像数据 Q包含根据Q = B.Wstatist..H的噪声加权。 除了抑制“锥形”伪像之外，至少一个实施例的所提出的方法指示即使在几次迭代之后图像噪声也显着降低。

公开(公告)号：US07515680B2

公开(公告)日：2009-04-07

申请号：US11180723

申请日：2005-07-14

申请人： Andreas Schaller ,  Karl Stierstorfer

发明人： Andreas Schaller ,  Karl Stierstorfer

IPC分类号： G01N23/06

CPC分类号： G06T11/005 ,  A61B6/032 ,  A61B6/583 ,  A61B6/585

摘要： A method is proposed for correcting detector signals of a unit for reconstructing tomograms from projection data, in particular of a computer tomography unit, of a ray detector having a multiplicity of individual detector channels that form the projection data, attenuation values of individual X-rays being calculated after the passage through an examination object. In order to reconstruct the tomograms from attenuation values of the X-rays, the detector output signals are subjected to a nonlinearity correction before the calculation of the attenuation values.

摘要翻译： 提出了一种用于校正用于从投影数据（特别是计算机断层摄影单元）重​​建断层图像的单元的检测器信号的方法，该检测器信号具有形成投影数据的多个单独检测器通道的射线检测器，各个X射线的衰减值 在通过检查对象后计算。 为了从X射线的衰减值重建断层图像，检测器输出信号在计算衰减值之前经受非线性校正。