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81. 发明申请

US20100046819A1 Method and image reconstruction device for generating computed tomography image data 有权
标题翻译：用于生成计算机断层摄影图像数据的方法和图像重建装置
公开(公告)号：US20100046819A1
公开(公告)日：2010-02-25
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 , H05G1/60
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 groups of M-lines for the reconstructions being selected from different of the following M-line subsets: i) a first M-line subset which is selected such that a surface constituted by the respective M-lines meets the detector surface completely within a Tam-Danielsson window, ii) a second M-line subset which is selected such that a surface constituted by the respective M-lines intersects a detector area before the Tam-Danielsson window in the infeed direction, iii) a third M-line subset which is selected such that a surface constituted by the respective M-lines intersects a detector area after the Tam-Danielsson window in the infeed direction. Lastly, the different reconstructed volumes are combined 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，感兴趣体积的至少两个基于体积的重建通过在由不同M组线组构成的表面上的差分背投进行执行，然后在每种情况下通过反希尔伯特变换，组用于重建的M线从不同的以下M线子集中选择：i）第一M线子集，其被选择为使得由相应M线构成的表面完全在Tam- 丹尼尔森窗口，ii）第二M线子集，其被选择为使得由相应M线构成的表面在进给方向上与Tam-Danielsson窗口之间的检测器区域相交; iii）第三M线子集，其是被选择为使得由相应的M行构成的表面在进给方向上的Tam-Danielsson窗口之后与检测器区域相交。最后，组合不同的重建体积以形成感兴趣体积的最终重建。

82. 发明授权

US07623618B2 Method for scattered radiation correction in X-ray imaging, and X-ray imaging system for this purpose 有权
标题翻译： X射线成像中散射辐射校正方法，X射线成像系统
公开(公告)号：US07623618B2
公开(公告)日：2009-11-24
申请号：US11896213
申请日：2007-08-30
申请人： Karl Stierstorfer
发明人： Karl Stierstorfer
IPC分类号： A61B6/00
CPC分类号： G03B42/02 , A61B6/583 , A61B6/585 , G01N23/046 , G01N2223/419 , H04N5/325
摘要： The present invention relates to a method for scattered radiation correction in X-ray imaging, and to an X-ray imaging system for carrying out the method. In the method, measurement signals t from an X-ray detector (9) are digitized and converted to logarithmic form, with these measurement signals t having been obtained by radiation through an examination object (10) by the X-ray detector (9). Correction values which have been obtained from a series development of a logarithm ln(1−s/t) are subtracted from the measurement signals that have been converted to logarithmic form, with this series development being terminated at the earliest after the first order, where s denotes a previously determined scattered radiation signal from radiation passed through the examination object (10). The method and the associated X-ray imaging system allow scattered radiation to be corrected for with increased accuracy, on the basis of measurement signals that had been converted to logarithmic form.
摘要翻译：本发明涉及X射线成像中的散射辐射校正方法以及用于实施该方法的X射线成像系统。在该方法中，来自X射线检测器（9）的测量信号t被数字化并转换为对数形式，其中这些测量信号t已经通过X射线检测器（9）通过检查对象（10）进行辐射而获得，。从已经被转换为对数形式的测量信号中减去从对数ln（1-s / t）的系列展开获得的校正值，该系列开发在第一阶以后最早终止，其中 s表示来自经过检查对象（10）的辐射的预先确定的散射辐射信号。该方法和相关的X射线成像系统基于已经被转换成对数形式的测量信号，允许以更高的精度校正散射辐射。

83. 发明申请

US20090141857A1 Method for post-processing raw detector signals, a computer program product, a computer readible medium and a radiation detection device 有权
标题翻译：用于后处理原始检测器信号的方法，计算机程序产品，计算机可读介质和放射线检测装置
公开(公告)号：US20090141857A1
公开(公告)日：2009-06-04
申请号：US12292372
申请日：2008-11-18
申请人： Rainer Raupach , Karl Stierstorfer
发明人： Rainer Raupach , Karl Stierstorfer
IPC分类号： H05G1/60
CPC分类号： A61B6/032 , A61B6/037 , A61B6/5205 , A61B6/583 , A61B6/585 , G01T1/2985 , G01T7/005
摘要： Methods for post-processing raw detector signals of an x-ray or gamma detector are disclosed. According to at least one embodiment of the invention, raw detector signals are filtered, an associated filtered signal is determined at least for a subset of the raw detector signals, and those filtered signals whose signal value is less than zero are then respectively replaced by a signal value greater than zero.
摘要翻译：公开了用于后处理x射线或γ检测器的原始检测器信号的方法。根据本发明的至少一个实施例，对原始检测器信号进行滤波，至少对于原始检测器信号的子集确定相关联的滤波信号，并且那些信号值小于零的那些滤波信号分别被替换为信号值大于零。

84. 发明授权

US07518116B2 X-ray detector 有权
标题翻译： X射线探测器
公开(公告)号：US07518116B2
公开(公告)日：2009-04-14
申请号：US11798389
申请日：2007-05-14
申请人： Silke Janssen , Karl Stierstorfer
发明人： Silke Janssen , Karl Stierstorfer
IPC分类号： G01T1/36
CPC分类号： H04N5/32 , G01T1/2985 , G03B42/02
摘要： An X-ray detector is disclosed for detecting individual quanta. In at least one embodiment, the X-ray detector includes a plurality of detector elements and an evaluation unit that is connected to the latter for data purposes and is set up in such a way that each detector element is assigned a first energy threshold, wherein in each case one portion of various radiation spectra that can be picked up by the detector element exhibits an energy below the energy threshold, and a further portion of the respective radiation spectrum exhibits an energy above the energy threshold. Further, the energy thresholds of the various detector elements are set in a different fashion in such a way that the ratio between the portion, exhibiting an energy above or below the energy threshold in the case of a first radiation spectrum, of the radiation spectrum and the portion, exhibiting an energy above or below the energy threshold in the case of a second radiation spectrum, of the radiation spectrum is intermatched in the case of the various detector elements.
摘要翻译：公开了用于检测单个量子的X射线检测器。在至少一个实施例中，X射线检测器包括多个检测器元件和评估单元，其连接到后者用于数据目的，并且被设置成使得每个检测器元件被分配第一能量阈值，其中在每种情况下，可以由检测器元件拾取的各种辐射光谱的一部分表现出低于能量阈值的能量，并且相应辐射光谱的另一部分表现出高于能量阈值的能量。此外，各种检测器元件的能量阈值以不同的方式设置，使得在辐射光谱的第一辐射光谱的情况下，表现出高于或低于能量阈值的能量的部分之间的比率，以及在各种检测器元件的情况下，在第二辐射光谱的情况下，表现出高于或低于能量阈值的能量的部分的辐射光谱的部分是互配的。

85. 发明申请

US20080285709A1 Imaging method for variable pitch spiral CT and a CT machine for carrying out the method 有权
标题翻译：可变螺距CT成像方法及CT机执行方法
公开(公告)号：US20080285709A1
公开(公告)日：2008-11-20
申请号：US12149487
申请日：2008-05-02
申请人： Karl Schwarz , Karl Stierstorfer
发明人： Karl Schwarz , Karl Stierstorfer
IPC分类号： A61B6/00
CPC分类号： G06T11/006 , A61B6/027
摘要： An imaging method is disclosed for variable pitch spiral CT. In at least one embodiment, the method includes spiral scanning of an examination object lying on a patient table, with the aid of a beam emanating from at least one focus, and the aid of a detector arrangement of planar design lying opposite the focus, the detector arrangement supplying output data that represent the attenuation of the beams during passage through the examination object; filtering the output data; weighted back projection of the filtered output data; and visualizing a layer or a volume on a display unit on the basis of the back projected output data. In at least one embodiment, a non constant pitch of the spiral scanning is taken into account computationally during the back projection. In at least one embodiment, a CT machine is disclosed for carrying out the above named method.
摘要翻译：公开了一种用于变桨距螺旋CT的成像方法。在至少一个实施例中，该方法包括借助于从至少一个焦点发出的光束以及与焦点相对的平面设计的检测器布置的帮助，躺在患者台上的检查对象的螺旋扫描，提供输出数据的检测器装置，其表示在通过检查对象期间光束的衰减; 过滤输出数据; 滤波输出数据的加权反投影; 并且基于背投影输出数据可视化显示单元上的图层或音量。在至少一个实施例中，螺旋扫描的非恒定间距在后投影期间被计算考虑在内。在至少一个实施例中，公开了一种用于执行上述方法的CT机器。

86. 发明申请

US20080232546A1 Method for scattered radiation correction in x-ray imaging, and x-ray imaging system for this purpose 有权
标题翻译： X射线成像中散射辐射矫正的方法和用于此目的的X射线成像系统
公开(公告)号：US20080232546A1
公开(公告)日：2008-09-25
申请号：US11896213
申请日：2007-08-30
申请人： Karl Stierstorfer
发明人： Karl Stierstorfer
IPC分类号： G01N23/20
CPC分类号： G03B42/02 , A61B6/583 , A61B6/585 , G01N23/046 , G01N2223/419 , H04N5/325
摘要： A method is disclosed for scattered radiation correction in X-ray imaging, and an X-ray imaging system is disclosed for carrying out the method. In at least one embodiment of the method, measurement signals t from an X-ray detector are digitized and converted to logarithmic form, with these measurement signals t having been obtained by radiation through an examination object by the X-ray detector. Correction values which have been obtained from a series development of a logarithm 1n(1−s/t) are subtracted from the measurement signals that have been converted to logarithmic form, with this series development being terminated at the earliest after the first order, where s denotes a previously determined scattered radiation signal from radiation passed through the examination object. At least one embodiment of the method and the associated X-ray imaging system allow scattered radiation to be corrected for with increased accuracy, on the basis of measurement signals that had been converted to logarithmic form.
摘要翻译：公开了用于X射线成像中的散射辐射校正的方法，并且公开了用于执行该方法的X射线成像系统。在该方法的至少一个实施例中，来自X射线检测器的测量信号t被数字化并转换为对数形式，其中这些测量信号t已经通过X射线检测器通过检查对象的辐射获得。从已经被转换成对数形式的测量信号中减去从对数1n（1-s / t）的系列展开获得的校正值，该系列开发在第一次之后最早终止，其中 s表示来自经过检查对象的辐射的预先确定的散射辐射信号。该方法和相关联的X射线成像系统的至少一个实施例基于已被转换成对数形式的测量信号，允许以更高的精度校正散射辐射。

87. 发明申请

US20080048126A1 X-ray detector 有权
标题翻译： X射线探测器
公开(公告)号：US20080048126A1
公开(公告)日：2008-02-28
申请号：US11798389
申请日：2007-05-14
申请人： Silke Janssen , Karl Stierstorfer
发明人： Silke Janssen , Karl Stierstorfer
IPC分类号： G01T1/00
CPC分类号： H04N5/32 , G01T1/2985 , G03B42/02
摘要： An X-ray detector is disclosed for detecting individual quanta. In at least one embodiment, the X-ray detector includes a plurality of detector elements and an evaluation unit that is connected to the latter for data purposes and is set up in such a way that each detector element is assigned a first energy threshold, wherein in each case one portion of various radiation spectra that can be picked up by the detector element exhibits an energy below the energy threshold, and a further portion of the respective radiation spectrum exhibits an energy above the energy threshold. Further, the energy thresholds of the various detector elements are set in a different fashion in such a way that the ratio between the portion, exhibiting an energy above or below the energy threshold in the case of a first radiation spectrum, of the radiation spectrum and the portion, exhibiting an energy above or below the energy threshold in the case of a second radiation spectrum, of the radiation spectrum is intermatched in the case of the various detector elements.
摘要翻译：公开了用于检测单个量子的X射线检测器。在至少一个实施例中，X射线检测器包括多个检测器元件和评估单元，其连接到后者用于数据目的，并且被设置成使得每个检测器元件被分配有第一能量阈值，其中在每种情况下，可以由检测器元件拾取的各种辐射光谱的一部分表现出低于能量阈值的能量，并且相应辐射光谱的另一部分表现出高于能量阈值的能量。此外，各种检测器元件的能量阈值以不同的方式设置，使得在辐射光谱的第一辐射光谱的情况下，表现出高于或低于能量阈值的能量的部分之间的比率，以及在各种检测器元件的情况下，在第二辐射光谱的情况下，表现出高于或低于能量阈值的能量的部分的辐射光谱的部分是互配的。

88. 发明申请

US20070093711A1 Method and tomography unit for the reconstruction of a tomographic representation of an object 失效
标题翻译：用于重建对象的断层图像的方法和断层摄影单元
公开(公告)号：US20070093711A1
公开(公告)日：2007-04-26
申请号：US11584544
申请日：2006-10-23
申请人： Martin Hoheisel , Wolfgang Harer , Holger Kunze , Karl Stierstorfer
发明人： Martin Hoheisel , Wolfgang Harer , Holger Kunze , Karl Stierstorfer
IPC分类号： A61B5/05
CPC分类号： G01N23/046 , A61B6/032 , A61B6/583 , G01N2223/419 , G01N2223/612 , G06T11/005 , G06T2211/421 , G06T2211/424
摘要： A method is disclosed for reconstructing a tomographic representation of an object from projection data off a moving radiation source through this object onto a detector, filtering and back projection of the projection data being executed in the reconstruction. In an embodiment of the method, by using at least one identical spatial arrangement of the radiation source, the detector and a test object instead of the object to be scanned, there is determined by test projections and an iterative reconstruction technique, a filter that in the given arrangement results in an optimum filtering and back projection of the projection data of the test object for the tomographic representation. Further, the object is scanned instead of the test object in the given arrangement and projection data are determined. Finally, the reconstruction of the tomographic representation is carried out using these projection data and the filter determined. Moreover, an embodiment of a tomography unit for carrying out this method is also disclosed.
摘要翻译：公开了一种用于将通过该物体的运动辐射源的投影数据从物体重建成检测器的方法，对重建中正在执行的投影数据进行滤波和反投影。在该方法的一个实施例中，通过使用辐射源，检测器和测试对象的至少一个相同的空间排列而不是要扫描的对象，通过测试投影和迭代重建技术来确定滤波器，给定的布置导致用于断层图像的测试对象的投影数据的最佳滤波和反投影。此外，在给定的布置中扫描对象而不是测试对象，并且确定投影数据。最后，使用这些投影数据并确定滤波器来进行断层图像的重建。此外，还公开了用于执行该方法的断层摄影单元的实施例。

89. 发明申请

US20060198493A1 Shadow mask for an X-ray detector, computed tomography unit having a shadow mask, and a method for adjusting a shadow mask 失效
公开(公告)号：US20060198493A1
公开(公告)日：2006-09-07
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： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
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.

90. 发明授权

US08744161B2 Method and computer system for scattered beam correction in a multi-source CT 有权
标题翻译：多源CT中散射束校正的方法和计算机系统
公开(公告)号：US08744161B2
公开(公告)日：2014-06-03
申请号：US13401879
申请日：2012-02-22
申请人： Thomas Flohr , Martin Petersilka , Karl Stierstorfer
发明人： Thomas Flohr , Martin Petersilka , Karl Stierstorfer
IPC分类号： G06K9/00
CPC分类号： G01N23/046 , A61B6/032 , A61B6/06 , A61B6/4014 , A61B6/4291 , A61B6/5205 , A61B6/5282 , G01N2223/419 , G01N2223/612 , G06T11/005 , G06T2211/424
摘要： A method and a computer system are disclosed for scattered beam correction in a CT examination of an object in a multi source CT. In at least one embodiment, the method includes generating original projection data records; reconstruction of the object with the original projection data records of at least one detector; determining the scattered radiation generated by each emitter exclusively in the direction of the original beams of the at least one other emitter relative to its opposing detector; generating corrected projection data records by removing the calculated scattered radiation from the original projection data records; reconstruction of the object with the corrected projection data records, and implementing a further iteration of the method when determining the scattered radiation or issuing the reconstruction result if at least one predetermined abort criterion applies.
摘要翻译：公开了一种用于在多源CT中的对象的CT检查中的散射束校正的方法和计算机系统。在至少一个实施例中，该方法包括生成原始投影数据记录; 用至少一个检测器的原始投影数据记录重建对象; 确定由每个发射器产生的散射辐射源专用于至少一个其它发射器的原始光束相对于其相对的检测器的方向; 通过从原始投影数据记录中去除计算的散射辐射来产生校正的投影数据记录; 使用校正的投影数据记录重建对象，并且如果应用至少一个预定中止标准，则在确定散射辐射或发出重建结果时，执行该方法的进一步迭代。

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