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：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：US20080181367A1

公开(公告)日：2008-07-31

申请号：US12008943

申请日：2008-01-15

申请人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Gunter Lauritsch

发明人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Gunter Lauritsch

IPC分类号： G01D18/00

CPC分类号： A61B6/4028 ,  A61B6/032 ,  A61B6/583

摘要： The invention relates to a method for determining gray-scale values for volume elements of bodies to be mapped using an x-ray image recording system. When a body to be mapped is not mapped in full on a single projection image for a rotational position, a second projection image must be made and a virtual projection image derived from the two projection images, this being back-projected onto the volume elements. For calibration the present invention proposes making the same two projection images in each case at a calibration phantom and additionally a further projection image, corresponding to the position and orientation of the virtual projection image. As a result the mathematical relationships between the projection images and the virtual projection image and for the back-projection can be derived.

摘要翻译： 本发明涉及一种用于使用X射线图像记录系统确定要映射的身体的体积元素的灰度值的方法。 当要映射的物体没有完全映射到用于旋转位置的单个投影图像上时，必须制作第二投影图像，并且从两个投影图像得到的虚拟投影图像被反投影到体积元件上。 为了进行校准，本发明提出了在校准模型中的每种情况下制作相同的两个投影图像，另外还提供了与虚拟投影图像的位置和取向相对应的另外的投影图像。 因此，可以推导出投影图像与虚拟投影图像之间的数学关系以及背投影的数学关系。

公开(公告)号：US07780351B2

公开(公告)日：2010-08-24

申请号：US12008943

申请日：2008-01-15

申请人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Günter Lauritsch

发明人： Benno Heigl ,  Stefan Hoppe ,  Joachim Hornegger ,  Günter Lauritsch

IPC分类号： G01D18/00

CPC分类号： A61B6/4028 ,  A61B6/032 ,  A61B6/583

摘要： The invention relates to a method for determining gray-scale values for volume elements of bodies to be mapped using an x-ray image recording system. When a body to be mapped is not mapped in full on a single projection image for a rotational position, a second projection image must be made and a virtual projection image derived from the two projection images, this being back-projected onto the volume elements. For calibration the present invention proposes making the same two projection images in each case at a calibration phantom and additionally a further projection image, corresponding to the position and orientation of the virtual projection image. As a result the mathematical relationships between the projection images and the virtual projection image and for the back-projection can be derived.

摘要翻译： 本发明涉及一种用于使用X射线图像记录系统确定要映射的身体的体积元素的灰度值的方法。 当要映射的物体没有完全映射到用于旋转位置的单个投影图像上时，必须制作第二投影图像，并且从两个投影图像得到的虚拟投影图像被反投影到体积元件上。 为了进行校准，本发明提出了在校准模型中的每种情况下制作相同的两个投影图像，另外还提供了与虚拟投影图像的位置和取向相对应的另外的投影图像。 因此，可以推导出投影图像与虚拟投影图像之间的数学关系以及背投影的数学关系。

公开(公告)号：US08107708B2

公开(公告)日：2012-01-31

申请号：US12217650

申请日：2008-07-08

申请人： Stefan Hoppe ,  Joachim Hornegger ,  Günter Lauritsch

发明人： Stefan Hoppe ,  Joachim Hornegger ,  Günter Lauritsch

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/466 ,  A61B6/5258 ,  G06T11/006 ,  G06T2211/421 ,  G06T2211/432

摘要： The invention relates to a method for correcting truncation artifacts in a reconstruction method for computed tomography recordings. The projection images are recorded by an x-ray image detector being extended by determining the attenuation of the radiation outside the projection image for pixels. Non-horizontal filter lines are extended by transaxial and axial artificial extension of the x-ray image detector for the purposes of truncation correction. The truncation correction for non-horizontal filter lines being carried out according to a method from at least one of the following groups: truncation correction takes place regardless of the specific location and orientation of the filter lines; truncation correction takes place as a function of the specific position and orientation of the filter lines, with the filter lines themselves being retained; and truncation correction takes place by introducing new modified filter lines, with filtering taking place along offset artificially extended filter lines.

摘要翻译： 本发明涉及一种用于计算机断层摄影记录的重建方法中的截断伪影的校正方法。 由X射线图像检测器记录投影图像，通过确定像素的投影图像之外的辐射的衰减而被扩展。 非水平滤波器线通过X射线图像检测器的横轴和轴向人造延伸来延伸，用于截断校正。 对于非水平滤波器线的截断校正根据以下组中的至少一个的方法执行：截断校正发生，而不管滤波器线的具体位置和取向如何; 截断校正作为滤波器线的具体位置和取向的函数发生，滤波器线本身被保持; 并且通过引入新的修改的滤波器线进行截断校正，并且沿着偏移人为扩展的滤波器线进行滤波。

公开(公告)号：US20080080758A1

公开(公告)日：2008-04-03

申请号：US11903164

申请日：2007-09-20

申请人： Stefan Hoppe ,  Joachim Hornegger ,  Gunter Lauritsch

发明人： Stefan Hoppe ,  Joachim Hornegger ,  Gunter Lauritsch

IPC分类号： G06K9/00

CPC分类号： A61B6/583 ,  A61B6/027 ,  Y10S378/901

摘要： A computer receives a number of groups of projection images of a reference object already known to the computer. Each projection image was captured via a recording arrangement with corresponding positioning of the recording arrangement. The computer uses one projection image for the respective position of the recording arrangement to determine an interim projection matrix, which describes a mapping of the three-dimensional space to a projection image captured with the respective positioning of the recording arrangement. The interim projection matrices relate to coordinate systems that are specifically assigned to each group. The computer uses interim projection matrices of different groups determined for the same position of the recording arrangement to determine locations of the other coordinate systems related to one of the coordinate systems. The computer uses the interim projection matrices and locations of the other coordinate systems to define a final projection matrix, that relates to a uniform coordinate system, for every position of the recording arrangement.

摘要翻译： 计算机接收计算机已知的参考对象的多组投影图像组。 每个投影图像通过记录装置的相应定位被捕获。 计算机使用一个投影图像作为记录装置的相应位置，以确定中间投影矩阵，其描述三维空间与通过记录装置的相应定位捕获的投影图像的映射。 临时投影矩阵涉及具体分配给每个组的坐标系。 计算机使用为记录装置的相同位置确定的不同组的临时投影矩阵，以确定与一个坐标系相关的其它坐标系的位置。 计算机使用其他坐标系的临时投影矩阵和位置来定义关于记录装置的每个位置的均匀坐标系的最终投影矩阵。

公开(公告)号：US20090016592A1

公开(公告)日：2009-01-15

申请号：US12217650

申请日：2008-07-08

申请人： Stefan Hoppe ,  Joachim Hornegger ,  Gunter Lauritsch

发明人： Stefan Hoppe ,  Joachim Hornegger ,  Gunter Lauritsch

IPC分类号： G06K9/00 ,  A61B6/00

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/466 ,  A61B6/5258 ,  G06T11/006 ,  G06T2211/421 ,  G06T2211/432

摘要： The invention relates to a method for correcting truncation artifacts in a reconstruction method for computed tomography recordings. The projection images are recorded by an x-ray image detector being extended by determining the attenuation of the radiation outside the projection image for pixels. Non-horizontal filter lines are extended by transaxial and axial artificial extension of the x-ray image detector for the purposes of truncation correction. The truncation correction for non-horizontal filter lines being carried out according to a method from at least one of the following groups: truncation correction takes place regardless of the specific location and orientation of the filter lines; truncation correction takes place as a function of the specific position and orientation of the filter lines, with the filter lines themselves being retained; and truncation correction takes place by introducing new modified filter lines, with filtering taking place along offset artificially extended filter lines.

摘要翻译： 本发明涉及一种用于计算机断层摄影记录的重建方法中的截断伪影的校正方法。 由X射线图像检测器记录投影图像，通过确定像素的投影图像之外的辐射的衰减而被扩展。 非水平滤波器线通过X射线图像检测器的横轴和轴向人造延伸来延伸，用于截断校正。 对于非水平滤波器线的截断校正根据以下组中的至少一个的方法执行：截断校正发生，而不管滤波器线的具体位置和取向如何; 截断校正作为滤波器线的具体位置和取向的函数发生，滤波器线本身被保持; 并且通过引入新的修改的滤波器线进行截断校正，并且沿着偏移人为扩展的滤波器线进行滤波。

公开(公告)号：US07912271B2

公开(公告)日：2011-03-22

申请号：US11903164

申请日：2007-09-20

申请人： Stefan Hoppe ,  Joachim Hornegger ,  Günter Lauritsch

发明人： Stefan Hoppe ,  Joachim Hornegger ,  Günter Lauritsch

IPC分类号： G06K9/00 ,  A61B6/03

CPC分类号： A61B6/583 ,  A61B6/027 ,  Y10S378/901

摘要： A computer receives a number of groups of projection images of a reference object already known to the computer. Each projection image was captured via a recording arrangement with corresponding positioning of the recording arrangement. The computer uses one projection image for the respective position of the recording arrangement to determine an interim projection matrix, which describes a mapping of the three-dimensional space to a projection image captured with the respective positioning of the recording arrangement. The interim projection matrices relate to coordinate systems that are specifically assigned to each group. The computer uses interim projection matrices of different groups determined for the same position of the recording arrangement to determine locations of the other coordinate systems related to one of the coordinate systems. The computer uses the interim projection matrices and locations of the other coordinate systems to define a final projection matrix, that relates to a uniform coordinate system, for every position of the recording arrangement.

摘要翻译： 计算机接收计算机已知的参考对象的多组投影图像组。 每个投影图像通过记录装置的相应定位被捕获。 计算机使用一个投影图像作为记录装置的相应位置，以确定中间投影矩阵，其描述三维空间与通过记录装置的相应定位捕获的投影图像的映射。 临时投影矩阵涉及具体分配给每个组的坐标系。 计算机使用为记录装置的相同位置确定的不同组的临时投影矩阵，以确定与一个坐标系相关的其它坐标系的位置。 计算机使用其他坐标系的临时投影矩阵和位置来定义关于记录装置的每个位置的均匀坐标系的最终投影矩阵。

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：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。