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公开(公告)号：US20080240340A1
公开(公告)日：2008-10-02
申请号：US12076040
申请日：2008-03-13
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。
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2.发明授权Imaging tomography apparatus with two acquisition systems in different planes and method for determining position correction values for the planes 有权具有不同平面中的两个采集系统的成像断层摄影装置和用于确定平面的位置校正值的方法公开(公告)号：US07130369B2
公开(公告)日：2006-10-31
申请号：US11166969
申请日：2005-06-24
IPC分类号： G01N23/00
CPC分类号： A61B6/032 , A61B6/4014
摘要： In a tomography apparatus and method for obtaining correction values for two measurement planes, wherein the tomography apparatus an acquisition system disposed in a first measurement plane and a second acquisition system disposed in a second measurement plane that are disposed in the azimuthal direction around a common rotation axis, position correction values for both measurement planes are determined for a substantially constant rotation angle speed of the two acquisition systems using measurement values calculated at a rotation angle position of a reference object that can be introduced into both measurement planes. An artifact-free reconstruction of a slice or volume image can be made using the position correction values.
摘要翻译： 在用于获得两个测量平面的校正值的断层摄影装置和方法中，其中所述断层摄影装置设置在第一测量平面中的采集系统和设置在第二测量平面中的第二采集系统，所述第二测量平面围绕公共旋转设置在方位角方向 对于两个测量平面的位置校正值，使用在可以被引入到两个测量平面中的参考对象的旋转角度位置处计算的测量值来确定两个采集系统的基本恒定的旋转角度速度。 可以使用位置校正值来进行切片或体积图像的无伪影重建。
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3.发明授权Imaging tomography apparatus with two acquisition systems, and method for determining their system angles 有权具有两个采集系统的成像断层摄影装置，以及用于确定其系统角度的方法公开(公告)号：US07263157B2
公开(公告)日：2007-08-28
申请号：US11167024
申请日：2005-06-24
IPC分类号： G01N23/083
CPC分类号： A61B6/032 , A61B6/4014
摘要： In a tomography apparatus and operating method, at least two acquisition systems are respectively each disposed in the azimuthal direction at respective specific system angles around a common rotation axis. Both system angles can be determined for a substantially constant rotation angle speed of the two acquisition systems on the basis of measurement values, which are calculated at a rotation angle position of a reference object that can be introduced into both measurement planes. The tomography apparatus in this manner enables artifact-free reconstruction of a slice or volume image using the system angles determined in this manner.
摘要翻译： 在断层摄影装置和操作方法中，至少两个采集系统分别以围绕公共旋转轴线的各个特定系统角度在方位角方向上设置。 可以基于在可以被引入到两个测量平面中的参考对象的旋转角度位置处计算的测量值来确定两个采集系统的基本恒定的旋转角速度的两个系统角度。 以这种方式的断层摄影装置使用以这种方式确定的系统角度能够进行切片或体积图像的无伪影重建。
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公开(公告)号：US20070086561A1
公开(公告)日：2007-04-19
申请号：US11543836
申请日：2006-10-06
CPC分类号： G03B42/02 , A61B6/032 , A61B6/4014 , A61B6/5282 , A61B6/583
摘要： A method for scattered radiation correction of a CT system, including at least two focus/detector systems operated angularly offset from one another, is disclosed. In the method, at at least one phantom, similar to the examined object at least in a subregion, for at least one of the focus/detector systems, the scattered radiation intensity occurring is determined in the detector of a focus/detector system during the operation of the at least one focus of at least one other focus/detector system. Further, the spatial distribution thereof is stored for a number of angles of rotation of the focus/detector systems. During scanning of the object, the scattered radiation intensities, determined with the aid of a similar phantom that originate from the at least one other focus/detector system, are subtracted from the measured intensities of the first focus/detector system while taking account of the spatial orientation of the focus/detector systems and the beam respectively considered. Finally, absorption values are calculated with the aid of the intensity values thus corrected, and CT pictures or CT volume data are thereby reconstructed.
摘要翻译： 公开了一种用于CT系统的散射辐射校正的方法，其包括彼此角度偏移地操作的至少两个焦点/检测器系统。 在该方法中，至少在至少一个子区域中的被检查对象的至少一个体模，对于焦点/检测器系统中的至少一个，在焦点/检测器系统的检测器期间确定发生的散射辐射强度 操作至少一个其它焦点/检测器系统的至少一个焦点。 此外，其空间分布被存储为聚焦/检测器系统的多个旋转角度。 在扫描对象期间，借助于来自至少一个其它焦点/检测器系统的类似幻影确定的散射辐射强度从所测量的第一焦点/检测器系统的强度中减去，同时考虑到 分别考虑了焦点/探测器系统和光束的空间取向。 最后，借助于如此校正的强度值来计算吸收值，由此重建CT图像或CT体积数据。
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公开(公告)号：US20070023713A1
公开(公告)日：2007-02-01
申请号：US11482263
申请日：2006-07-06
IPC分类号： H01J5/18
CPC分类号： G01T1/2985 , A61B6/583
摘要： In a method for non-iterative focus adjustment in a CT apparatus the position of the center ray with regard to the movement direction of the focus and the correct phase between the detector sampling frequency and the focus springing frequency are calculated with a minimal number of sinogram acquisitions and is adjusted without iterative steps, corresponding to predetermined values.
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公开(公告)号：US20060018426A1
公开(公告)日：2006-01-26
申请号：US11166969
申请日：2005-06-24
CPC分类号： A61B6/032 , A61B6/4014
摘要： In a tomography apparatus and method for obtaining correction values for two measurement planes, wherein the tomography apparatus an acquisition system disposed in a first measurement plane and a second acquisition system disposed in a second measurement plane that are disposed in the azimuthal direction around a common rotation axis, position correction values for both measurement planes are determined for a substantially constant rotation angle speed of the two acquisition systems using measurement values calculated at a rotation angle position of a reference object that can be introduced into both measurement planes. An artifact-free reconstruction of a slice or volume image can be made using the position correction values.
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公开(公告)号：US07835485B2
公开(公告)日：2010-11-16
申请号：US12076040
申请日：2008-03-13
IPC分类号： A61B6/00
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。
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公开(公告)号：US07440536B2
公开(公告)日：2008-10-21
申请号：US11543836
申请日：2006-10-06
IPC分类号： G01N23/00
CPC分类号： G03B42/02 , A61B6/032 , A61B6/4014 , A61B6/5282 , A61B6/583
摘要： A method for scattered radiation correction of a CT system, including at least two focus/detector systems operated angularly offset from one another, is disclosed. In the method, at at least one phantom, similar to the examined object at least in a subregion, for at least one of the focus/detector systems, the scattered radiation intensity occurring is determined in the detector of a focus/detector system during the operation of the at least one focus of at least one other focus/detector system. Further, the spatial distribution thereof is stored for a number of angles of rotation of the focus/detector systems. During scanning of the object, the scattered radiation intensities, determined with the aid of a similar phantom that originate from the at least one other focus/detector system, are subtracted from the measured intensities of the first focus/detector system while taking account of the spatial orientation of the focus/detector systems and the beam respectively considered. Finally, absorption values are calculated with the aid of the intensity values thus corrected, and CT pictures or CT volume data are thereby reconstructed.
摘要翻译： 公开了一种用于CT系统的散射辐射校正的方法，其包括彼此角度偏移地操作的至少两个焦点/检测器系统。 在该方法中，至少在至少一个子区域中的被检查对象的至少一个体模，对于焦点/检测器系统中的至少一个，在焦点/检测器系统的检测器期间确定发生的散射辐射强度 操作至少一个其它焦点/检测器系统的至少一个焦点。 此外，其空间分布被存储为聚焦/检测器系统的多个旋转角度。 在扫描对象期间，借助于来自至少一个其它焦点/检测器系统的类似幻影确定的散射辐射强度从所测量的第一焦点/检测器系统的强度中减去，同时考虑到 分别考虑了焦点/探测器系统和光束的空间取向。 最后，借助于如此校正的强度值来计算吸收值，由此重建CT图像或CT体积数据。
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公开(公告)号：US07277522B2
公开(公告)日：2007-10-02
申请号：US11482263
申请日：2006-07-06
IPC分类号： G01N23/00
CPC分类号： G01T1/2985 , A61B6/583
摘要： In a method for non-iterative focus adjustment in a CT apparatus the position of the center ray with regard to the movement direction of the focus and the correct phase between the detector sampling frequency and the focus springing frequency are calculated with a minimal number of sinogram acquisitions and is adjusted without iterative steps, corresponding to predetermined values.
摘要翻译： 在CT装置中用于非迭代聚焦调整的方法中，相对于焦点的移动方向的中心射线的位置和检测器采样频率与聚焦弹起频率之间的正确相位的计算是用最小数量的正弦图 并且在没有迭代步骤的情况下进行调整，对应于预定值。
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10.发明申请Imaging tomography apparatus with two acquisition systems, and method for determining their system angles 有权具有两个采集系统的成像断层摄影装置，以及用于确定其系统角度的方法公开(公告)号：US20060018423A1
公开(公告)日：2006-01-26
申请号：US11167024
申请日：2005-06-24
CPC分类号： A61B6/032 , A61B6/4014
摘要： In a tomography apparatus and operating method, at least two acquisition systems are respectively each disposed in the azimuthal direction at respective specific system angles around a common rotation axis. Both system angles can be determined for a substantially constant rotation angle speed of the two acquisition systems on the basis of measurement values, which are calculated at a rotation angle position of a reference object that can be introduced into both measurement planes. The tomography apparatus in this manner enables artifact-free reconstruction of a slice or volume image using the system angles determined in this manner.
摘要翻译： 在断层摄影装置和操作方法中，至少两个采集系统分别以围绕公共旋转轴线的各个特定系统角度在方位角方向上设置。 可以基于在可以被引入到两个测量平面中的参考对象的旋转角度位置处计算的测量值来确定两个采集系统的基本恒定的旋转角速度的两个系统角度。 以这种方式的断层摄影装置使用以这种方式确定的系统角度能够进行切片或体积图像的无伪影重建。
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