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公开(公告)号：US08718343B2
公开(公告)日：2014-05-06
申请号：US13111315
申请日：2011-05-19
IPC分类号： G06K9/00
CPC分类号： A61B6/5205 , A61B6/032 , A61B6/4014 , A61B6/4441 , A61B6/482 , A61B6/507 , A61B6/5258 , G06T11/006 , G06T2211/424
摘要： A method is disclosed for reconstructing image data of an examination object from measured data, wherein the measured data was captured previously during a relative rotary motion between a radiation source of a computed tomography system and the examination object. In at least one embodiment, the measured data is modified to achieve a particular grayscale characteristic of the image data to be reconstructed. The image data is calculated by way of an iterative algorithm using the modified measured data, wherein no arithmetic step for reducing noise is employed in the iterations.
摘要翻译： 公开了一种用于从测量数据重建检查对象的图像数据的方法，其中在计算机断层摄影系统的辐射源和检查对象之间的相对旋转运动期间先前捕获测量数据。 在至少一个实施例中，修改测量数据以实现要重建的图像数据的特定灰度特性。 通过使用修改的测量数据的迭代算法计算图像数据，其中在迭代中不采用用于降低噪声的算术步骤。
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公开(公告)号：US20110293160A1
公开(公告)日：2011-12-01
申请号：US13111315
申请日：2011-05-19
IPC分类号： G06K9/00
CPC分类号： A61B6/5205 , A61B6/032 , A61B6/4014 , A61B6/4441 , A61B6/482 , A61B6/507 , A61B6/5258 , G06T11/006 , G06T2211/424
摘要： A method is disclosed for reconstructing image data of an examination object from measured data, wherein the measured data was captured previously during a relative rotary motion between a radiation source of a computed tomography system and the examination object. In at least one embodiment, the measured data is modified to achieve a particular grayscale characteristic of the image data to be reconstructed. The image data is calculated by way of an iterative algorithm using the modified measured data, wherein no arithmetic step for reducing noise is employed in the iterations.
摘要翻译： 公开了一种用于从测量数据重建检查对象的图像数据的方法，其中在计算机断层摄影系统的辐射源和检查对象之间的相对旋转运动期间先前捕获测量数据。 在至少一个实施例中，修改测量数据以实现要重建的图像数据的特定灰度特性。 通过使用修改的测量数据的迭代算法计算图像数据，其中在迭代中不采用用于降低噪声的算术步骤。
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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：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：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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6.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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7.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：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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9.发明申请Method for calibrating a CT system having at least two focus/detector systems arranged angularly offset from one another, and computed tomography system 审中-公开用于校准具有彼此成角度地偏移布置的至少两个焦点/检测器系统的CT系统的方法和计算机断层摄影系统公开(公告)号：US20070086564A1
公开(公告)日：2007-04-19
申请号：US11543931
申请日：2006-10-06
申请人： Herbert Bruder , Martin Petersilka
发明人： Herbert Bruder , Martin Petersilka
CPC分类号： A61B6/032 , A61B6/4085 , A61B6/582 , A61B6/583
摘要： A method is disclosed for calibrating a CT system having at least two focus/detector systems which are fastened on a rotatable gantry and are arranged angularly offset from one another, in order to scan a patient the angularly offset foci with fanned-open X-ray beams irradiating the respectively oppositely situated detectors with a multiplicity of detector elements arranged like matrices, while the focus/detector systems rotate about the object, preferably a patient, moved, if appropriate, along a system axis, and each detector element of each focus/detector system is assigned an X-ray beam per angle of rotation of the gantry. According to an embodiment of the method, the measured values of the at least two focus/detector systems are coordinated with one another individually per measured X-ray beam before the carrying out of a reconstruction of CT data of the object or patient from at least two different focus/detector systems by means of a calibration matrix (Kk,s,rFDSA, Kk,s,rFDSB) per focus/detector system, each calibration matrix (Kk,s,rFDSA, Kk,s,rFDSB) being determined in such a way that it generates a compensation between measured values during simultaneous operation of the at least two focus/detector systems, on the one hand, and absorption data mutually uninfluenced by the number of focus/detector systems, on the other hand.
摘要翻译： 公开了一种用于校准具有至少两个焦点/检测器系统的CT系统的方法，所述至少两个焦点/检测器系统被紧固在可旋转机架上并且彼此成角度地偏移地布置，以便扫描患者具有扇形开放X射线的角度偏移灶 光束照射位于相对位置的检测器上的多个检测器元件排列成矩阵，而聚焦/检测器系统围绕物体（优选病人）旋转，如果合适的话沿着系统轴线移动，并且每个焦点/ 检测器系统根据台架的每个旋转角度分配X射线束。 根据该方法的一个实施例，至少两个聚焦/检测器系统的测量值在每个测量的X射线束之间彼此单独协调，然后从至少对象或患者的CT数据的重建进行 两个不同的焦点/检测器系统通过校准矩阵（K k，s，r，...，FDSA，K k，s，r SUP 每个焦点/检测器系统，每个校准矩阵（K k，s，r，...，F s），K k，s， 一方面确定该方法，使得其在至少两个焦点/检测器系统的同时操作期间在测量值之间产生补偿，另一方面在相互不受影响的吸收数据之间产生补偿 另一方面，焦点/检测器系统的数量。
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公开(公告)号：US20070081622A1
公开(公告)日：2007-04-12
申请号：US11543930
申请日：2006-10-06
申请人： Herbert Bruder , Martin Petersilka
发明人： Herbert Bruder , Martin Petersilka
CPC分类号： A61B6/5282 , A61B6/032 , A61B6/4014
摘要： A method is disclosed for scattered radiation correction of a CT system including two simultaneously operated focus/detector systems, arranged angularly offset from one another on a rotatable gantry. In an embodiment of the method, in order to scan an object, the two focus/detector systems arranged angularly offset from one another scan the object by virtue of the fact that they rotate about a system axis of the CT system. A multiplicity of absorption values of individual rays are then determined from the measured attenuations of the radiation of the foci and the measured values are subjected to scattered radiation correction. The positive differences for the direct rays are determined in channelwise fashion from the intensity values of the direct rays and the intensity values of the “complementary” rays removed by 180°, and this positive difference is subtracted as scattered radiation correction from the intensity value of the direct ray to determine the attenuation values and to thereafter reconstruct CT tomograms or CT volume data.
摘要翻译： 公开了一种用于CT系统的散射辐射校正的方法，其包括两个同时操作的聚焦/检测器系统，其在可旋转机架上彼此成角度地偏移地布置。 在该方法的一个实施例中，为了扫描对象，由于它们围绕CT系统的系统轴旋转的事实，彼此成角度偏移地布置的两个焦点/检测器系统扫描对象。 然后根据测量的灶的辐射的衰减确定单个射线的多个吸收值，并且测量的值经受散射辐射校正。 直接光线的正差异是从直射光的强度值和180°除去的“互补”光线的强度值以通道方式确定的，并且将这个正差值作为散射辐射校正从 直接确定衰减值，然后重建CT断层图像或CT体积数据。
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