公开(公告)号：US08768030B2

公开(公告)日：2014-07-01

申请号：US13020256

申请日：2011-02-03

申请人： Herbert Bruder ,  Karl Stierstorfer

发明人： Herbert Bruder ,  Karl Stierstorfer

IPC分类号： G06K9/00 ,  A61B6/00 ,  A61B6/03 ,  G06T11/00

CPC分类号： A61B6/481 ,  A61B6/032 ,  A61B6/4014 ,  A61B6/466 ,  A61B6/482 ,  A61B6/504 ,  A61B6/507 ,  G06T11/006 ,  G06T2211/424

摘要： A method is disclosed for reconstructing image data of an examination object from measurement data of a computed tomography system, the examination object having been irradiated simultaneously by a number of X-ray sources while the measurement data was being acquired so that different projections of the examination object associated with the number of X-ray sources were acquired simultaneously for each detector element. In at least one embodiment, different iteration images of the examination object are determined one after the other from the measurement data by way of an iterative algorithm, a computation operation being employed with the iterative algorithm, which is applied to the iteration images and takes the presence of the number of X-ray sources into account.

摘要翻译： 公开了一种用于从计算机断层摄影系统的测量数据重建检查对象的图像数据的方法，在获取测量数据的同时由多个X射线源同时照射检查对象，使得检查的不同预测 与每个检测器元件同时获取与X射线源数量相关联的物体。 在至少一个实施例中，通过迭代算法从测量数据一个接一个地确定检查对象的不同迭代图像，与迭代算法一起使用计算操作，其应用于迭代图像，并采用 存在X射线源的数量。

公开(公告)号：US08422627B2

公开(公告)日：2013-04-16

申请号：US12585579

申请日：2009-09-18

申请人： Steffen Kappler ,  Christian Schröter ,  Karl Stierstorfer ,  Matthias Strassburg

发明人： Steffen Kappler ,  Christian Schröter ,  Karl Stierstorfer ,  Matthias Strassburg

IPC分类号： A61B6/03

CPC分类号： G01T1/17 ,  G01T1/24

摘要： A method is disclosed for detecting X-ray radiation from an X-ray emitter. In at least one embodiment of the method, an electric pulse with a pulse amplitude characteristic of the energy of a quantum is generated when a quantum of the X-ray radiation impinges on a sensor, wherein a number of threshold energies are predetermined. When the pulse amplitude corresponding to the respective energy is exceeded, a signal is emitted each time the pulse amplitude corresponding to a respective threshold energy is exceeded. At least one embodiment of the method permits reliable and high-quality imaging, even in image regions with high X-ray quanta rates. To this end, at least one of the threshold energies is predetermined such that it is higher than the maximum energy of the X-ray spectrum emitted by the X-ray emitter.

摘要翻译： 公开了一种用于检测来自X射线发射器的X射线辐射的方法。 在该方法的至少一个实施例中，当X射线辐射的量子撞击到传感器上时，产生具有量子能量的脉冲振幅特性的电脉冲，其中预定了许多阈值能量。 当超过对应于各自能量的脉冲幅度时，每当超过对应于相应的阈值能量的脉冲幅度时，发出信号。 该方法的至少一个实施例允许可靠和高质量的成像，即使在具有高X射线量子速率的图像区域中。 为此，阈值能量中的至少一个是预定的，使得它高于由X射线发射器发射的X射线光谱的最大能量。

公开(公告)号：US20120213424A1

公开(公告)日：2012-08-23

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 ,  G06F7/60 ,  A61B6/03

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。

公开(公告)号：US08121251B2

公开(公告)日：2012-02-21

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： A61B6/03

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。

公开(公告)号：US20110317901A1

公开(公告)日：2011-12-29

申请号：US13164796

申请日：2011-06-21

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

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

IPC分类号： G06K9/00

CPC分类号： A61B6/032 ,  A61B6/4441 ,  A61B6/481 ,  A61B6/486 ,  A61B6/503 ,  A61B6/507 ,  A61B6/5211 ,  A61B6/5264 ,  A61B6/5288 ,  A61B2090/3762 ,  G06T5/002 ,  G06T5/50 ,  G06T11/006 ,  G06T2207/10081 ,  G06T2207/20221 ,  G06T2207/30048 ,  G06T2211/412 ,  G06T2211/436

摘要： A method is disclosed for the reconstruction of picture data of a moving object under examination from measurement, with the measurement data having been recorded beforehand for a relative rotational movement between a radiation source of a computed tomography system and the object under examination. In at least one embodiment, first picture data is computed from a complete measurement dataset of the measurement data for a picture reconstruction, and second picture data is computed from an incomplete measurement dataset for a computed tomography picture reconstruction. The first picture data and the second picture data are combined into third picture data, with the combination being computed using location-dependent movement information of the object under examination.

摘要翻译： 公开了一种用于重建从测量中检查的移动物体的图像数据的方法，其中测量数据已被预先记录在计算机断层摄影系统的辐射源和被检查物体之间的相对旋转运动。 在至少一个实施例中，从用于图像重建的测量数据的完整测量数据集计算第一图像数据，并且从用于计算机断层摄影图像重建的不完整测量数据集计算第二图像数据。 将第一图像数据和第二图像数据组合成第三图像数据，使用正在检查的对象的位置相关运动信息来计算组合。

公开(公告)号：US07856134B2

公开(公告)日：2010-12-21

申请号：US12457973

申请日：2009-06-26

申请人： Ernst-Peter Rührnschopf ,  Martin Sedlmair ,  Karl Stierstorfer

发明人： Ernst-Peter Rührnschopf ,  Martin Sedlmair ,  Karl Stierstorfer

IPC分类号： G06K9/00

CPC分类号： A61B6/405 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4241 ,  A61B6/482

摘要： A method for generating image data relating to a virtually prescribable X-ray tube voltage U3 from first and second dual energy CT image data is disclosed. In at least one embodiment, the method includes providing the first and second CT image data; prescribing the virtual X-ray tube voltage U3 with U3≠U1 and U3≠U2, on the basis of the first and second CT image data for two prescribable base materials A, B; determining in each case a spatial density distribution ρA(x), ρB(x), assigned to the base materials A, B, in the reconstructed object volume, ρ(x)=ρA(x)+ρB(x) holds true for a density ρ(x) of a voxel x in the reconstructed object volume; providing an effective mass attenuation coefficient U3 for the base material A, and an effective mass attenuation coefficient U3 for the base material B, the effective mass attenuation coefficients U3 and U3 respectively being valid for an X-ray spectrum S(E, U3) assigned to the virtual X-ray tube voltage U3; and determining the image data as a third distribution of linear attenuation coefficients μ3(x) in the reconstructed object volume on the basis of the following relationship: μ3(x)= U3·ρA(x)+ U3·ρB(x).

摘要翻译： 公开了一种从第一和第二双能量CT图像数据生成与虚拟规定的X射线管电压U3有关的图像数据的方法。 在至少一个实施例中，该方法包括提供第一和第二CT图像数据; 以U3≠U1和U3≠U2的虚拟X射线管电压U3为基础，基于两个可处方的基材A，B的第一和第二CT图像数据; 在每种情况下确定分配给重建对象体积中的基础材料A，B的空间密度分布和（r）A（x），（r），（x），（x）=＆rgr; A（x）+ ＆rgr; B（x）对于重建对象体积中的体素x的密度和（r）（x）是正确的; 为基材A提供有效的质量衰减系数<αA> U3，对于基材B有效的质量衰减系数<αB> U3，有效质量衰减系数αA> U3和<αB> U3分别对 分配给虚拟X射线管电压U3的X射线光谱S（E，U3） 基于以下关系，将图像数据确定为重建对象体积中的线性衰减系数μ3（x）的第三分布：μ3（x）= <αA> U3·＆rgr; A（x）+ <αB> U3·＆rgr; B（x）。

公开(公告)号：US20100014737A1

公开(公告)日：2010-01-21

申请号：US12457973

申请日：2009-06-26

申请人： Ernst-Peter Rührnschopf ,  Martin Sedlmair ,  Karl Stierstorfer

发明人： Ernst-Peter Rührnschopf ,  Martin Sedlmair ,  Karl Stierstorfer

IPC分类号： G06K9/00

CPC分类号： A61B6/405 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4241 ,  A61B6/482

摘要： A method for generating image data relating to a virtually prescribable X-ray tube voltage U3 from first and second dual energy CT image data is disclosed. In at least one embodiment, the method includes providing the first and second CT image data; prescribing the virtual X-ray tube voltage U3 with U3≠U1 and U3≠U2, on the basis of the first and second CT image data for two prescribable base materials A, B; determining in each case a spatial density distribution ρA(x), ρB(x), assigned to the base materials A, B, in the reconstructed object volume, ρ(x)=ρA(x)+ρB(x) holds true for a density ρ(x) of a voxel x in the reconstructed object volume; providing an effective mass attenuation coefficient U3 for the base material A, and an effective mass attenuation coefficient U3 for the base material B, the effective mass attenuation coefficients U3 and U3 respectively being valid for an X-ray spectrum S(E, U3) assigned to the virtual X-ray tube voltage U3; and determining the image data as a third distribution of linear attenuation coefficients μ3(x) in the reconstructed object volume on the basis of the following relationship: μ3(x)= U3·ρA(x)+ U3·ρB(x).

摘要翻译： 公开了一种从第一和第二双能量CT图像数据生成与虚拟规定的X射线管电压U3有关的图像数据的方法。 在至少一个实施例中，该方法包括提供第一和第二CT图像数据; 以U3U1和U3U2为基础的虚拟X射线管电压U3，根据两个可处方基材A，B的第一和第二CT图像数据; 在每种情况下确定分配给重建对象体积中的基材A，B的空间密度分布rhoA（x），rhoB（x），rho（x）= rhoA（x）+ rhoB（x）对于 重建对象体积中体素x的密度rho（x）; 为基材A提供有效的质量衰减系数3和基材B的有效质量衰减系数3，有效质量衰减系数3和3分别对于分配的X射线光谱S（E，U3）有效 到虚拟X射线管电压U3; 并根据以下关系确定图像数据为重建对象体积中的线性衰减系数mu3（x）的第三分布：mu3（x）= 3.rhoA（x）+ 3.rhoB（x）。

公开(公告)号：US07447295B2

公开(公告)日：2008-11-04

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： H05G1/60

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。

公开(公告)号：US07391927B2

公开(公告)日：2008-06-24

申请号：US11225035

申请日：2005-09-14

申请人： Karl Stierstorfer

发明人： Karl Stierstorfer

IPC分类号： G06K9/40

CPC分类号： A61B6/032 ,  G06T11/005

摘要： A method and a computed tomography unit are disclosed, that render it possible in a simple way to remove ring artifacts from tomograms Ik, particularly in the case of a fast feed of the recording region per revolution of the recording system of the computed tomography unit by calculating a ring artifact image Ik for each tomogram Ik. In this procedure, temporary ring artifact images Rtk are firstly calculated for each tomogram Ik, and subsequently the final ring artifact image Rk is formed for the purpose of correcting the respective tomogram Ik by averaging over at least a portion Tsub of the temporary ring artifact images Rtk, the temporary ring artifact images Rtk being rotated before averaging in such a way that the ring artifacts present in the temporary artifact images Rtk substantially coincide and their position substantially corresponds to the ring artifacts present in the tomogram Ik.

摘要翻译： 公开了一种方法和计算机断层摄影单元，其可以以简单的方式从断层图像中去除环形伪影，特别是在每一周的记录区域的快速馈送的情况下 通过针对每个断层图像I N k计算环形伪像图像I N k来计算断层摄影单元的记录系统。 在该过程中，首先针对每个断层图像I N k来计算临时环形伪影图像R SUB，并且随后最终的环形伪影图像R≠K 其目的是通过对临时环形伪影图像Rt SUB的至少一部分T N进行平均来校正相应的断层图像I＆lt; k＆gt; 临时环形伪影图像Rt N在平均之前旋转，使得存在于临时假象图像Rt1k中的环形伪像基本上重合，并且它们的位置基本上对应于 存在于断层图像I 中的环形伪像。

公开(公告)号：US07313214B2

公开(公告)日：2007-12-25

申请号：US11100531

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 ,  G01N23/083

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

摘要： A computed tomography unit includes at least one X-ray tube, that scans an object in a fashion rotating in a circle or spiral about a z-axis, in combination with an oppositely situated detector having a multiplicity of detector rows. Each detector row includes an aperture Δz in the z-direction, having a multiplicity of detector elements. Between the X-ray tube and detector, a detector diaphragm is arranged that reduces the aperture Δz of the detector rows in the z-direction. The X-ray tube includes a focus, of variable location relative to the X-ray tube and which alternatingly assumes during scanning at least two different positions that have different z-coordinates relative to the X-ray tube R.

摘要翻译： 计算机断层摄影单元包括至少一个X射线管，其以相对位置的具有多个检测器行的检测器的组合，以围绕z轴旋转的方式扫描物体或旋转物体。 每个检测器行包括沿z方向的孔径Deltaz，具有多个检测器元件。 在X射线管和检测器之间，布置了检测器膜片，其减小了检测器行在z方向上的孔径Deltaz。 X射线管包括相对于X射线管可变位置的焦点，并且在扫描期间交替地假设相对于X射线管R具有不同z坐标的至少两个不同位置。