公开(公告)号：US07711083B2

公开(公告)日：2010-05-04

申请号：US11897348

申请日：2007-08-30

申请人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Ernst-Peter Rührnschopf ,  Holger Scherl ,  Bernhard Scholz ,  Michael Zellerhoff

发明人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Ernst-Peter Rührnschopf ,  Holger Scherl ,  Bernhard Scholz ,  Michael Zellerhoff

IPC分类号： A61B6/00

CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4458 ,  G01N2223/419 ,  G01N2223/612

摘要： To enable an artifact free reconstruction even in the case of large regions of interest and with scanning paths of below 360°, provision is made for a method, with which a three-dimensional image volume is reconstructed from a number of two-dimensional projection images of a region of interest, which were recorded about the region of interest during a rotation of a recording system, comprising an x-ray source with a focal point and a detector, by calculating the gray scale values of the voxels of the image volume by back projection of the projection images, with which each two-dimensional projection images is composed in each instance from at least two individual projection images to form an extended two-dimensional projection image, with the respectively at least two individual projection images being recorded with a constant relative position between the focal point and the region of interest.

摘要翻译： 为了即使在感兴趣的大区域和360度以下的扫描路径的情况下也能够实现无伪影重建，提供一种方法，利用该方法从多个二维投影图像重建三维图像体积 通过计算图像体积的体素的灰度值，通过计算图像体积的体素的灰度值，记录关于记录系统旋转期间的感兴趣区域的感兴趣区域，其包括具有焦点和检测器的x射线源 投影图像的背投影，每个二维投影图像在每个实例中由至少两个单独的投影图像组成，以形成扩展的二维投影图像，分别具有至少两个单独的投影图像被记录有 焦点和感兴趣区域之间的常数相对位置。

公开(公告)号：US20080089468A1

公开(公告)日：2008-04-17

申请号：US11897348

申请日：2007-08-30

申请人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Ernst-Peter Ruhrnschopf ,  Holger Scherl ,  Bernhard Scholz ,  Michael Zellerhoff

发明人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Ernst-Peter Ruhrnschopf ,  Holger Scherl ,  Bernhard Scholz ,  Michael Zellerhoff

IPC分类号： A61B6/03

CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4458 ,  G01N2223/419 ,  G01N2223/612

摘要： To enable an artifact free reconstruction even in the case of large regions of interest and with scanning paths of below 360°, provision is made for a method, with which a three-dimensional image volume is reconstructed from a number of two-dimensional projection images of a region of interest, which were recorded about the region of interest during a rotation of a recording system, comprising an x-ray source with a focal point and a detector, by calculating the gray scale values of the voxels of the image volume by back projection of the projection images, with which each two-dimensional projection images is composed in each instance from at least two individual projection images to form an extended two-dimensional projection image, with the respectively at least two individual projection images being recorded with a constant relative position between the focal point and the region of interest.

摘要翻译： 为了即使在感兴趣的大区域和360度以下的扫描路径的情况下也能够实现无伪影重建，提供一种方法，利用该方法从多个二维投影图像重建三维图像体积 通过计算图像体积的体素的灰度值，通过计算图像体积的体素的灰度值，记录关于记录系统旋转期间的感兴趣区域的感兴趣区域，其包括具有焦点和检测器的x射线源 投影图像的背投影，每个二维投影图像在每个实例中由至少两个单独的投影图像组成，以形成扩展的二维投影图像，分别具有至少两个单独的投影图像被记录有 焦点和感兴趣区域之间的常数相对位置。

公开(公告)号：US08619944B2

公开(公告)日：2013-12-31

申请号：US12772793

申请日：2010-05-03

申请人： Frank Dennerlein ,  Stefan Hoppe ,  Markus Kowarschik ,  Holger Scherl

发明人： Frank Dennerlein ,  Stefan Hoppe ,  Markus Kowarschik ,  Holger Scherl

IPC分类号： A61B6/03

CPC分类号： G01N23/06 ,  A61B6/027 ,  A61B6/032 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421

摘要： A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction.

摘要翻译： 提供了一种用于使用可移动X射线源和检测器确定用于记录投影的物体的衰减系数的方法和装置。 该方法包括指定可移动X射线源的轨迹，指定用于确定由检测器记录的投影的导数的轨迹上的位置，指定针对每个指定位置的多个扫描位置，跟踪具有X轴的轨迹， 并且对每个扫描位置记录投影，使用针对相关联的多个扫描位置记录的投影，针对每个位置对与轨迹路径相关的投影导数进行数值计算，并根据所计算的投影确定该物体的衰减系数 衍生物使用理论上精确或近似的重建规则。

公开(公告)号：US20100286928A1

公开(公告)日：2010-11-11

申请号：US12772793

申请日：2010-05-03

申请人： Frank Dennerlein ,  Stefan Hoppe ,  Markus Kowarschik ,  Holger Scherl

发明人： Frank Dennerlein ,  Stefan Hoppe ,  Markus Kowarschik ,  Holger Scherl

IPC分类号： G01T1/00 ,  G01N23/04 ,  G06F19/00

CPC分类号： G01N23/06 ,  A61B6/027 ,  A61B6/032 ,  G06T11/006 ,  G06T2211/416 ,  G06T2211/421

摘要： A method and a device for determining attenuation coefficients for an object using a movable X-ray source and a detector, which is provided for recording projections, is provided. The method includes specifying a trajectory for the movable X-ray source, specifying positions on the trajectory for determining a derivative of projections recorded by the detector, specifying a plurality of scanning positions for each of the specified positions, following the trajectory with the X-ray source and recording a projection for each scanning position, numerically calculating a projection derivative in relation to the trajectory path for each of the positions using the projections recorded for the associated plurality of scanning positions, and determining attenuation coefficients for the object from the calculated projection derivatives using a theoretically exact or approximate rule for the reconstruction.

摘要翻译： 提供了一种用于使用可移动X射线源和检测器确定用于记录投影的物体的衰减系数的方法和装置。 该方法包括指定可移动X射线源的轨迹，指定用于确定由检测器记录的投影的导数的轨迹上的位置，指定针对每个指定位置的多个扫描位置，跟踪具有X轴的轨迹， 并且对每个扫描位置记录投影，使用针对相关联的多个扫描位置记录的投影，针对每个位置对与轨迹路径相关的投影导数进行数值计算，并根据所计算的投影确定该物体的衰减系数 衍生物使用理论上精确或近似的重建规则。

公开(公告)号：US20120045105A1

公开(公告)日：2012-02-23

申请号：US13210606

申请日：2011-08-16

申请人： Klaus Engel ,  Oliver Klar ,  Markus Kowarschik ,  Manuel Meilinger ,  Holger Scherl ,  Christian Schmidgunst

发明人： Klaus Engel ,  Oliver Klar ,  Markus Kowarschik ,  Manuel Meilinger ,  Holger Scherl ,  Christian Schmidgunst

IPC分类号： G06K9/00

CPC分类号： G01N23/046 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/4441 ,  A61B6/5205 ,  A61B6/5258 ,  G01N2223/401 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/008

摘要： In a method and device spatially resolved quality information is provided for an x-ray imaging procedure in which a data field representing the examination subject is reconstructed from a number of exposures of an examination subject. Quality information that indicates the reliability of the reconstructed data field for the corresponding element is determined for a number of elements of the data field.

摘要翻译： 在一种方法和装置中，提供了用于X射线成像程序的空间分辨质量信息，其中从检查对象的多次曝光重建代表检查对象的数据字段。 针对数据字段的多个元素确定指示相应元素的重构数据字段的可靠性的质量信息。

公开(公告)号：US20110075899A1

公开(公告)日：2011-03-31

申请号：US12889718

申请日：2010-09-24

申请人： Holger Kunze ,  Holger Scherl

发明人： Holger Kunze ,  Holger Scherl

IPC分类号： G06K9/00

CPC分类号： G01N23/046 ,  A61B2090/3762 ,  G01N2223/419

摘要： A method for determining absorption coefficients corrected with polychromy artifacts for an object composed of a plurality of material types differentiated with absorption attributes is provided. A plurality of x-ray beam projections of the object are recorded with monochrome x-rays from different positions. The recorded projections are reconstructed to determine a first set of absorption coefficients. The projections are calculated by reprojection. The recorded projections are corrected by the calculated projections. A second set of absorption coefficients corrected with polychromy artifacts is finally determined by reconstructing the corrected projections. A formula-based description of a rule taking account of polychromy is used in the calculation. The rule includes parameters to be determined by the reprojection in the course of the calculation of projections. The method combines steps of conventional methods and is thus more efficient.

摘要翻译： 提供了一种用于由用吸收属性区分的多种材料类型组成的对象的多色伪影来校正吸收系数的方法。 用不同位置的单色x射线记录物体的多个x射线束投影。 记录的投影被重构以确定第一组吸收系数。 投影通过重新投影计算。 记录的投影由计算的投影进行校正。 最后通过重建校正的投影来确定用多色伪影校正的第二组吸收系数。 在计算中使用了一个考虑到多色的规则的基于公式的描述。 该规则包括在计算投影过程中由重新投影确定的参数。 该方法结合常规方法的步骤，因此更有效。

公开(公告)号：US08213564B2

公开(公告)日：2012-07-03

申请号：US12888121

申请日：2010-09-22

申请人： Frank Dennerlein ,  Holger Scherl

发明人： Frank Dennerlein ,  Holger Scherl

IPC分类号： A61B6/03

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

摘要： A method for determining attenuation coefficients for an object using a movable x-ray source and a detector for recording projections is provided. The method includes defining a trajectory for the movable x-ray source, defining filtering lines for the filtering of projection data, and defining positions on the filtering lines, at which the projection derivative is to be formed using a mathematical algorithm for a back-projection. The method also includes defining sampling positions on the trajectory, traversing, by the x-ray source, the trajectory and recording a projection for each sampling position. Projection derivatives with respect to the trajectory path are calculated numerically for each of the positions directly on the filtering lines, and using a mathematical algorithm, attenuation coefficients are determined for the object from the calculated projection derivatives, for the reconstruction.

摘要翻译： 提供了一种使用可移动x射线源和用于记录投影的检测器来确定物体的衰减系数的方法。 该方法包括定义可移动x射线源的轨迹，定义用于过滤投影数据的滤波线，以及定义滤波线上的位置，在该线上将使用用于反投影的数学算法形成投影导数 。 该方法还包括定义轨迹上的采样位置，由x射线源穿过轨迹并记录每个采样位置的投影。 对于轨迹路径的投影导数，对于直接在滤波线上的每个位置进行数值计算，并且使用数学算法，对于重建，从所计算的投影导数确定对象的衰减系数。

公开(公告)号：US08259896B2

公开(公告)日：2012-09-04

申请号：US12889718

申请日：2010-09-24

申请人： Holger Kunze ,  Holger Scherl

发明人： Holger Kunze ,  Holger Scherl

IPC分类号： A61B6/00

CPC分类号： G01N23/046 ,  A61B2090/3762 ,  G01N2223/419

摘要： A method for determining absorption coefficients corrected with polychromy artifacts for an object composed of a plurality of material types differentiated with absorption attributes is provided. A plurality of x-ray beam projections of the object are recorded with monochrome x-rays from different positions. The recorded projections are reconstructed to determine a first set of absorption coefficients. The projections are calculated by reprojection. The recorded projections are corrected by the calculated projections. A second set of absorption coefficients corrected with polychromy artifacts is finally determined by reconstructing the corrected projections. A formula-based description of a rule taking account of polychromy is used in the calculation. The rule includes parameters to be determined by the reprojection in the course of the calculation of projections. The method combines steps of conventional methods and is thus more efficient.

摘要翻译： 提供了一种用于由用吸收属性区分的多种材料类型组成的对象的多色伪影来校正吸收系数的方法。 用不同位置的单色x射线记录物体的多个x射线束投影。 记录的投影被重构以确定第一组吸收系数。 投影通过重新投影计算。 记录的投影由计算的投影进行校正。 最后通过重建校正的投影来确定用多色伪影校正的第二组吸收系数。 在计算中使用了一个考虑到多色的规则的基于公式的描述。 该规则包括在计算投影过程中由重新投影确定的参数。 该方法结合常规方法的步骤，因此更有效。

公开(公告)号：US20110069807A1

公开(公告)日：2011-03-24

申请号：US12888121

申请日：2010-09-22

申请人： Frank Dennerlein ,  Holger Scherl

发明人： Frank Dennerlein ,  Holger Scherl

IPC分类号： A61B6/03

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

摘要： A method for determining attenuation coefficients for an object using a movable x-ray source and a detector for recording projections is provided. The method includes defining a trajectory for the movable x-ray source, defining filtering lines for the filtering of projection data, and defining positions on the filtering lines, at which the projection derivative is to be formed using a mathematical algorithm for a back-projection. The method also includes defining sampling positions on the trajectory, traversing, by the x-ray source, the trajectory and recording a projection for each sampling position. Projection derivatives with respect to the trajectory path are calculated numerically for each of the positions directly on the filtering lines, and using a mathematical algorithm, attenuation coefficients are determined for the object from the calculated projection derivatives, for the reconstruction.

摘要翻译： 提供了一种使用可移动x射线源和用于记录投影的检测器来确定物体的衰减系数的方法。 该方法包括定义可移动x射线源的轨迹，定义用于过滤投影数据的滤波线，以及定义滤波线上的位置，在该线上将使用用于反投影的数学算法形成投影导数 。 该方法还包括定义轨迹上的采样位置，由x射线源穿过轨迹并记录每个采样位置的投影。 对于轨迹路径的投影导数，对于直接在滤波线上的每个位置进行数值计算，并且使用数学算法，对于重建，从所计算的投影导数确定对象的衰减系数。

公开(公告)号：US20100232673A1

公开(公告)日：2010-09-16

申请号：US12706894

申请日：2010-02-17

申请人： Benjamin Keck ,  Markus Kowarschik ,  Jasmina Ludwig ,  Thomas Mertelmeier ,  Holger Scherl

发明人： Benjamin Keck ,  Markus Kowarschik ,  Jasmina Ludwig ,  Thomas Mertelmeier ,  Holger Scherl

IPC分类号： G06K9/00 ,  A61B6/03

CPC分类号： A61B6/502 ,  G06T5/003 ,  G06T5/50 ,  G06T2207/10081 ,  G06T2207/30068

摘要： An improvement in image quality when determining an image using iterative reconstruction is provided by taking account of focus shifts. In order to take into consideration the influence of focus shift in calculated projections, several different projections are calculated for each section of the focus path on a section-by-section basis. The several different calculated projections for a section are averaged for comparison with a projection recorded in the section. Improved image quality is provided, for example, in tomosynthesis applications in which a large number of recordings are made with a stationary detector.

摘要翻译： 通过考虑焦点偏移来提供使用迭代重建确定图像时图像质量的改善。 为了考虑到计算投影中的焦点偏移的影响，对于每个焦点路径的每一个部分，逐个部分地计算出几个不同的投影。 对于部分的几个不同的计算投影进行平均，以与该部分中记录的投影进行比较。 提供了改进的图像质量，例如在其中使用固定式检测器进行大量记录的断层合成应用中。