公开(公告)号：US20110033097A1

公开(公告)日：2011-02-10

申请号：US12849082

申请日：2010-08-03

申请人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Thomas Flohr ,  Rainer Raupach ,  Karl Stierstorfer

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  A61B5/0456 ,  A61B6/4014 ,  A61B6/482 ,  A61B6/503 ,  A61B6/507 ,  G06T11/006 ,  G06T2211/412 ,  G06T2211/424 ,  G06T2211/436

摘要： A method is disclosed for reconstructing image data of a moving examination object from measurement data, wherein the measurement data was captured in the course of a relative rotational movement between a radiation source of a computed tomography system and the examination object. In at least one embodiment of the method, a first image of the examination object is calculated from a complete measurement data record of the measurement data for an image reconstruction and a second image of the examination object is calculated from an incomplete measurement data record of the measurement data for an image reconstruction. Frequency splitting of the first and second images takes place respectively in at least one low-frequency and one higher-frequency component and the image data of the second image is supplemented in the low-frequency component with image data of the low-frequency component of the first image. In a further processing step the second image thus supplemented is improved using the first image, in that errors due to the incompleteness of the measurement data record of the second image are reduced.

摘要翻译： 公开了一种用于从测量数据重建运动检查对象的图像数据的方法，其中在计算机断层摄影系统的辐射源和检查对象之间的相对旋转运动的过程中捕获测量数据。 在该方法的至少一个实施例中，根据用于图像重构的测量数据的完整测量数据记录来计算检查对象的第一图像，并且从不完整的测量数据记录计算检查对象的第二图像 用于图像重建的测量数据。 第一和第二图像的频率分割分别发生在至少一个低频和一个较高频分量中，并且第二图像的图像数据在低频分量中被补充，低频分量的图像数据是 第一张图片。 在另外的处理步骤中，使用第一图像来改善如此补充的第二图像，因为减少了由于第二图像的测量数据记录的不完备性造成的错误。

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。

公开(公告)号：US07505553B2

公开(公告)日：2009-03-17

申请号：US11100445

申请日：2005-04-07

申请人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Thomas Flohr ,  Karl Stierstorfer

IPC分类号： A61B6/03

CPC分类号： G06T11/005 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4028 ,  A61B6/4085 ,  G01N23/046 ,  G01N2223/419

摘要： A method is for taking computed tomography scans with the aid of a CT unit and to a CT unit. An X-ray tube is moved in a circle or spiral about a z-axis in combination with a detector situated opposite and an object is scanned. The X-ray tube includes a jumping focus with two or more different jumping focal positions relative to the X-ray tube. Parallel data records are formed from the detector data obtained, and tomograms are reconstructed therefrom. When forming the parallel data records, account is taken of the different position of the respectively current jumping focus in relation to the X-ray tube (=jumping focal position) in the radial direction.

摘要翻译： 一种方法是借助于CT单元和CT单元进行计算机断层扫描。 X射线管与围绕z轴的圆形或螺旋形组合移动，与检测器相结合并且物体被扫描。 X射线管包括相对于X射线管具有两个或多个不同跳跃焦点位置的跳跃焦点。 从获得的检测器数据形成并行数据记录，并从其重构断层图像。 在形成并行数据记录时，考虑到相对于X射线管（=跳跃焦点位置）在径向上的分别当前跳跃焦点的不同位置。

公开(公告)号：US07476025B2

公开(公告)日：2009-01-13

申请号：US11365583

申请日：2006-03-02

申请人： Claus Pohan ,  Mario Reinwand ,  Karl Stierstorfer

发明人： Claus Pohan ,  Mario Reinwand ,  Karl Stierstorfer

IPC分类号： A61B6/08

CPC分类号： A61B6/06 ,  A61B6/032 ,  G01T1/295 ,  G21K1/02

摘要： A shadow mask and method for adjustment are disclosed. The shadow mask may be for an X-ray detector including detector elements, which may further be provided for a computed tomography unit, for example. The shadow mask has a mask plate with holes of which each is assigned a detector element. At least one adjusting hole of the mask plate includes enlarged dimensions in such a way that it is adapted to the dimensions of at least two detector elements. The adjusting hole serves for the method of adjusting the shadow mask over the X-ray detector. Measurement signals of the detector elements that are assigned to the at least one adjusting hole, are determined by using X-radiation. The shadow mask and the X-ray detector are adjusted relative to one another on the basis of a comparison of the measurement signals of the detector elements.

摘要翻译： 公开了一种荫罩和调节方法。 阴影掩模可以用于包括检测器元件的X射线检测器，其可以进一步提供用于计算机断层摄影单元。 荫罩具有一个具有孔的掩模板，每个孔分配有检测器元件。 掩模板的至少一个调节孔包括扩大的尺寸，使其适于至少两个检测器元件的尺寸。 调整孔用于调整X射线检测器上的荫罩的方法。 通过使用X射线来确定分配给至少一个调整孔的检测器元件的测量信号。 基于检测器元件的测量信号的比较，荫罩和X射线检测器相对于彼此调节。

公开(公告)号：US07440598B2

公开(公告)日：2008-10-21

申请号：US10235584

申请日：2002-09-05

申请人： Herbert Bruder ,  Thomas Flohr ,  Otto Sembritzki ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Thomas Flohr ,  Otto Sembritzki ,  Karl Stierstorfer

IPC分类号： G06K9/00 ,  G06K9/40 ,  H04N5/00 ,  A61B6/00

CPC分类号： G06T11/005 ,  G06T5/002 ,  G06T5/008 ,  G06T2207/10081

摘要： In a method and filter and computer product for adaptive filtering of projection data acquired by a medical diagnostic apparatus, raw data-based filtering of the acquired projection data is undertaken using a filter with a filter kernel having a constant filter width, and the filtered projection data are mixed with the acquired projection data with a fixing of the respective quantitative relationships of filtered projection data to acquired projection data ensuing dependent on respective subsets of the acquired projection data.

摘要翻译： 在用于由医疗诊断装置获取的投影数据的自适应滤波的方法和滤波器和计算机产品中，使用具有恒定滤波器宽度的滤波器核的滤波器进行所获取的投影数据的基于原始数据的滤波，并且滤波投影 将数据与所获取的投影数据混合，并将取决于所获取的投影数据的各个子集的滤波后的投影数据的各自的定量关系固定为所获取的投影数据。

公开(公告)号：US20080240340A1

公开(公告)日：2008-10-02

申请号：US12076040

申请日：2008-03-13

申请人： Herbert Bruder ,  Martin Petersilka ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Martin Petersilka ,  Karl Stierstorfer

IPC分类号： A61B6/00 ,  G01N23/201

CPC分类号： A61B6/4014 ,  A61B6/032 ,  A61B6/583

摘要： A method is disclosed for scattered radiation correction in x-ray imaging devices having a number of x-ray sources that can be moved around an examination object in at least one scanning plane during a measurement pass. During the measurement pass, a number of x-ray projections are recorded at different projection angles with simultaneous use of the x-ray sources. In at least one embodiment of the present method, parameters characterizing an outer object contour are determined in the scanning plane from measured data of different x-ray projections. In at least one embodiment, on the basis of one object contour section whose characterizing parameters have been determined from x-ray projections that lie in front of and/or behind the respective x-ray projection by a defined projection angle range, for each x-ray projection an assigned scattered radiation distribution is then retrieved or is interpolated in a database from scattered radiation distributions for object contour sections with similar characterizing parameters. This scattered radiation distribution is then used for the correction of the measured data for the respective x-ray projection. In at least one embodiment, the method enables scattered radiation correction in conjunction with operation of the x-ray sources.

摘要翻译： 公开了一种用于在X射线成像装置中的散射辐射校正的方法，其具有可在测量通过期间在至少一个扫描平面中围绕检查对象移动的多个x射线源。 在测量通过期间，以不同的投影角记录多个X射线投射，同时使用x射线源。 在本方法的至少一个实施例中，表征外部对象轮廓的参数在扫描平面中从不同X射线投影的测量数据确定。 在至少一个实施例中，基于一个对象轮廓部分，其特征参数已经由位于相应x射线投影前面和/或后面的X射线投影确定了一个限定的投影角度范围，对于每个x 射线投影然后检索分配的散射辐射分布，或者从数据库中插入具有相似特征参数的物体轮廓部分的散射辐射分布。 然后将这种散射的辐射分布用于校正各个X射线投影的测量数据。 在至少一个实施例中，该方法结合X射线源的操作实现散射辐射校正。

公开(公告)号：US20080205737A1

公开(公告)日：2008-08-28

申请号：US12068678

申请日：2008-02-11

申请人： Holger Kunze ,  Karl Stierstorfer

发明人： Holger Kunze ,  Karl Stierstorfer

IPC分类号： G06K9/00 ,  G06K9/36

CPC分类号： G06T11/006 ,  G06T2211/424 ,  G06T2211/432

摘要： Incomplete data records owing to an object extent that stretches beyond the scanning field of view (SFOV) constitute a general problem in computed tomography. In these cases, parts of the object are to be reconstructed, for which only incomplete projections from an angular range of less than 180° are available. The application of iterative algorithms such as, for example, the algebraic reconstruction technique (ART) or the simultaneous algebraic reconstruction technique (SART) to this problem of truncated projections cannot lead to a satisfactory solution unless use is made of special boundary conditions. In order to regularize the reconstruction method, in at least one embodiment, information relating to the statistics of the attenuation values of the reconstructed object is also included in the form of the logarithmic probability function of the attenuation values. This information can be obtained from the regions of those image parts which are still completely contained in the SFOV, but nevertheless lie in the vicinity of the region where the object leaves the SFOV. Furthermore, the information can be used in an algebraic reconstruction method by adding a boundary condition term to the cost function to be minimized. Experiments indicate that taking account of this information leads to good estimates with reference to the object in the event of insubstantially truncated projections such as are customary in CT applications, for example.

摘要翻译： 由于目标范围延伸超出扫描视场（SFOV）的不完整的数据记录在计算机断层摄影中构成了一个普遍的问题。 在这些情况下，要重构对象的部分，仅从角度范围小于180°的不完全投影可用。 对于这种截断投影的问题，迭代算法（例如代数重建技术（ART）或同时代数重构技术（SART））的应用不能导致令人满意的解决方案，除非使用特殊的边界条件。 为了使重建方法正规化，在至少一个实施例中，与重建对象的衰减值的统计相关的信息也以衰减值的对数概率函数的形式包含。 该信息可以从仍然完全包含在SFOV中的那些图像部分的区域获得，但仍然位于物体离开SFOV的区域附近。 此外，通过向成本函数添加边界条件项以最小化，可以在代数重建方法中使用该信息。 实验表明，考虑到这种信息，在例如CT应用中常见的非实质截断的投影的情况下，参考对象可以得出良好的估计。