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1. 发明授权

US08891885B2 Method, computing unit, CT system and C-arm system for reducing metal artifacts in CT image datasets 有权
标题翻译：方法，计算单元，CT系统和C臂系统，用于减少CT图像数据集中的金属伪影
公开(公告)号：US08891885B2
公开(公告)日：2014-11-18
申请号：US13562478
申请日：2012-07-31
申请人： Marc Kachelriess , Esther Meyer , Rainer Raupach
发明人： Marc Kachelriess , Esther Meyer , Rainer Raupach
IPC分类号： G06K9/00 , A61B6/03 , G06T5/50 , A61B6/00 , G06T11/00 , G06T5/00
CPC分类号： A61B6/00 , A61B6/03 , A61B6/5282 , G06T5/003 , G06T5/50 , G06T11/008 , G06T2207/10081
摘要： A method is disclosed for reducing metal artifacts in CT image datasets. An embodiment of the method includes reconstructing a first CT image dataset with and a second CT image dataset without metal artifact correction, weighted summation of a high-pass-filtered first and a high-pass-filtered second CT image dataset plus a low-pass-filtered second CT image dataset, wherein the weightings are dependent on the proximity to metal in the CT image datasets. A computing unit, a CT system and a C-arm system designed to execute the method are also disclosed.
摘要翻译：公开了用于减少CT图像数据集中的金属伪影的方法。该方法的实施例包括用没有金属伪像校正的第一CT图像数据集和第二CT图像数据集重建第一CT图像数据集，高通滤波的第一和高通滤波的第二CT图像数据集加低通的加权求和过滤的第二CT图像数据集，其中权重取决于CT图像数据集中金属的接近度。还公开了一种计算单元，CT系统和设计用于执行该方法的C臂系统。

2. 发明申请

US20110007956A1 SINOGRAM PROCESSING TO REDUCE METAL ARTIFACTS IN COMPUTED TOMOGRAPHY 审中-公开
标题翻译： SINOGRAM加工减少计算机成像中的金属制品
公开(公告)号：US20110007956A1
公开(公告)日：2011-01-13
申请号：US12824389
申请日：2010-06-28
申请人： Esther Meyer , Rainer Raupach
发明人： Esther Meyer , Rainer Raupach
IPC分类号： G06K9/00
CPC分类号： A61B6/032 , A61B6/12 , A61B6/4014 , A61B6/4266 , A61B6/4441 , A61B6/481 , A61B6/482 , A61B6/503 , A61B6/504 , A61B6/507 , G06T11/005
摘要： A method is disclosed for reconstructing image data of an examination object from measurement data, wherein the measurement data was captured as projection data during a relative rotational movement between a radiation source of a computed tomography system and the examination object. In at least one embodiment, a first image is determined from the measurement data and pixel values of the first image are modified, by classifying the pixel values in at least three classes, a class pixel value being assigned to each class, and the pixels of the first image being allocated the respective class pixel value. Projection data is calculated from the thus modified first image. The calculated projection data is used to normalize the measured projection data. Values are modified in the normalized projection data and the thus modified normalized projection data is subjected to a processing that reverses normalization. Finally a second image is determined from the thus processed projection data.
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将测量数据作为投影数据被捕获。在至少一个实施例中，根据测量数据确定第一图像，并通过对至少三个类别中的像素值进行分类，分配给每个类的像素值和第一图像被分配相应的类像素值。从这样修改的第一图像计算投影数据。计算出的投影数据用于归一化所测量的投影数据。在标准化投影数据中修改值，并且对这样修改的标准化投影数据进行反转归一化处理。最后，从这样处理的投影数据确定第二图像。

3. 发明申请

US20130039556A1 METHOD, COMPUTING UNIT, CT SYSTEM AND C-ARM SYSTEM FOR REDUCING METAL ARTIFACTS IN CT IMAGE DATASETS 有权
标题翻译：方法，计算单元，CT系统和C-ARM系统，用于减少CT图像数据中的金属制品
公开(公告)号：US20130039556A1
公开(公告)日：2013-02-14
申请号：US13562478
申请日：2012-07-31
申请人： Marc Kachelriess , Esther Meyer , Rainer Raupach
发明人： Marc Kachelriess , Esther Meyer , Rainer Raupach
IPC分类号： G06K9/40 , G06K9/00
CPC分类号： A61B6/00 , A61B6/03 , A61B6/5282 , G06T5/003 , G06T5/50 , G06T11/008 , G06T2207/10081
摘要： A method is disclosed for reducing metal artifacts in CT image datasets. An embodiment of the method includes reconstructing a first CT image dataset with and a second CT image dataset without metal artifact correction, weighted summation of a high-pass-filtered first and a high-pass-filtered second CT image dataset plus a low-pass-filtered second CT image dataset, wherein the weightings are dependent on the proximity to metal in the CT image datasets. A computing unit, a CT system and a C-arm system designed to execute the method are also disclosed.
摘要翻译：公开了一种用于减少CT图像数据集中的金属伪影的方法。该方法的实施例包括用没有金属伪像校正的第一CT图像数据集和第二CT图像数据集重建第一CT图像数据集，高通滤波的第一和高通滤波的第二CT图像数据集加低通的加权求和过滤的第二CT图像数据集，其中权重取决于CT图像数据集中金属的接近度。还公开了一种计算单元，CT系统和设计用于执行该方法的C臂系统。

4. 发明授权

US09993216B2 Creating a resultant image for a specifiable, virtual x-ray quanta energy distribution 有权
公开(公告)号：US09993216B2
公开(公告)日：2018-06-12
申请号：US15068554
申请日：2016-03-12
申请人： Thomas Flohr , Steffen Kappler , Rainer Raupach , Bernhard Schmidt
发明人： Thomas Flohr , Steffen Kappler , Rainer Raupach , Bernhard Schmidt
IPC分类号： A61B6/03 , A61B5/00 , A61B6/00
CPC分类号： A61B6/5205 , A61B5/0077 , A61B6/032 , A61B6/482
摘要： A method for creating a resultant image for a specifiable, virtual x-ray quanta energy distribution includes capturing a first image dataset of the patient, capturing at least one second image dataset of the patient, and specifying a virtual x-ray quanta energy distribution. The method also includes establishing a spatial density distribution of the patient for at least two materials based on the first image dataset and the at least one second image dataset. The method includes creating a third image dataset of the patient based on the specified virtual x-ray quanta energy distribution and the established spatial material density distributions. The third image dataset represents an x-ray attenuation distribution of the patient corresponding to the specified virtual x-ray quanta energy distribution. The method also includes creating the virtual image from the third image dataset.

5. 发明授权

US09147267B2 Reconstruction of image data 有权
标题翻译：重建图像数据
公开(公告)号：US09147267B2
公开(公告)日：2015-09-29
申请号：US13674422
申请日：2012-11-12
申请人： Herbert Bruder , Rainer Raupach
发明人： Herbert Bruder , Rainer Raupach
IPC分类号： G06K9/00 , G06T11/00 , A61B6/03 , A61B6/00
CPC分类号： G06T11/003 , A61B6/032 , A61B6/5205 , G06T11/006 , G06T2211/424
摘要： A method and image reconstruction facility are disclosed for reconstructing an image dataset based on a projection dataset acquired with the aid of an x-ray computed tomography apparatus. With an embodiment of the method, a first image dataset is reconstructed based on the projection dataset and an edge image dataset is generated, which indicates a measure of an edge strength of edges occurring in at least one spatial/temporal direction in the first image dataset, as a function of location. An output image dataset is then generated based on the first image dataset, with the resolution in the first image dataset being increased as a function of location in at least one spatial/temporal direction taking into account the edge image dataset.
摘要翻译：公开了一种基于通过X射线计算机断层摄影装置获得的投影数据集来重构图像数据集的方法和图像重建装置。利用该方法的实施例，基于投影数据集重建第一图像数据集，并且生成边缘图像数据集，其指示在第一图像数据集中的至少一个空间/时间方向上出现的边缘的边缘强度的度量，作为位置的函数。然后，基于第一图像数据集生成输出图像数据集，其中第一图像数据集中的分辨率随着至少一个空间/时间方向的位置而增加，同时考虑边缘图像数据集。

6. 发明授权

US08892187B2 Method for reducing step artifacts in a cardio CT representation 有权
标题翻译：减少心脏CT表现中的步骤假象的方法
公开(公告)号：US08892187B2
公开(公告)日：2014-11-18
申请号：US11727751
申请日：2007-03-28
申请人： Herbert Bruder , Rainer Raupach
发明人： Herbert Bruder , Rainer Raupach
IPC分类号： A61B5/05 , G06T3/40 , A61B6/00 , G06T7/20 , A61B6/03
CPC分类号： G06T3/4007 , A61B6/032 , A61B6/503 , A61B6/5217 , G06T7/246 , G06T2207/30048 , G06T2211/412
摘要： A method is disclosed for reducing step artifacts in the forward increment direction of a cardio CT representation. In at least one embodiment, volume recordings or section images of first and second sub-volumes of a heart volume, which lie adjacent to one another in the forward increment direction and partially overlap in an overlap region, are recorded by a computer tomography system. Each sub-volume's detector data is used for the reconstruction coming from different heart cycles. Finally, a displacement vector relative to a second sub-volume is determined at least for a selected point of the overlap region of a first sub-volume and the second sub-volume is subjected at least partially to a spatial transformation according to the at least one displacement vector.
摘要翻译：公开了一种用于减少心脏CT表示的向前增量方向上的步骤伪像的方法。在至少一个实施例中，通过计算机断层摄影系统记录心脏体积的第一和第二子体积的体积记录或分段图像，其以正向增量方向彼此相邻并且在重叠区域中部分重叠。每个子体积的检测器数据用于来自不同心脏周期的重建。最后，至少对于第一子体积的重叠区域的选定点确定相对于第二子体积的位移矢量，并且至少部分地将第二子体积至少部分地进行空间变换，至少一个位移矢量。

7. 发明授权

US08718343B2 Iterative reconstruction of CT images without a regularization term 有权
标题翻译：没有正规化术语的CT图像的迭代重建
公开(公告)号：US08718343B2
公开(公告)日：2014-05-06
申请号：US13111315
申请日：2011-05-19
申请人： Herbert Bruder , Martin Petersilka , Rainer Raupach , Karl Schwarz
发明人： Herbert Bruder , Martin Petersilka , Rainer Raupach , Karl Schwarz
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。

8. 发明授权

US08675937B2 Method for increasing the quality of computer tomographic recording series by projection data processing and CT system having a computation unit 失效
标题翻译：通过投影数据处理和具有计算单元的CT系统来提高计算机断层摄影记录系列的质量的方法
公开(公告)号：US08675937B2
公开(公告)日：2014-03-18
申请号：US12314892
申请日：2008-12-18
申请人： Rainer Raupach , Anja Borsdorf
发明人： Rainer Raupach , Anja Borsdorf
IPC分类号： A61B6/03
CPC分类号： A61B6/03 , A61B6/507 , G06T5/002 , G06T5/10 , G06T11/006 , G06T2207/10081
摘要： A method is disclosed for increasing the quality of computer tomographic recording series, to a computation unit and to an X-ray CT system. An embodiment of the method includes scanning a subject over a period of time which makes it possible to record at least two temporally offset projection data sets of the same recording region; transforming the projection data sets into transformation data sets for at least two spatial frequency ranges; calculating temporal compensation values of the transformation data sets for some of the spatial frequency ranges and replacing the compensated values of the transformation data sets with the calculated compensation values in new transformation data sets, projection data of congruent rays always being compared; transforming the new transformation data sets back into new projection data sets; reconstructing image data sets on the basis of the new projection data sets and representing the image data sets.
摘要翻译：公开了一种用于将计算机断层记录系列的质量提高到计算单元和X射线CT系统的方法。该方法的实施例包括在一段时间内扫描对象，这使得可以记录相同记录区域的至少两个时间偏移的投影数据集; 将投影数据集转换为用于至少两个空间频率范围的变换数据集; 计算一些空间频率范围的变换数据集的时间补偿值，并用新的变换数据集中的计算出的补偿值代替变换数据集的补偿值，总是比较全等光线的投影数据; 将新的变换数据集转换为新的投影数据集; 基于新的投影数据集重建图像数据集并表示图像数据集。

9. 发明授权

US08639003B2 Method for the noise reduction of CT image data and image processing system 有权
标题翻译： CT图像数据和图像处理系统降噪方法
公开(公告)号：US08639003B2
公开(公告)日：2014-01-28
申请号：US12710423
申请日：2010-02-23
申请人： Herbert Bruder , Rainer Raupach
发明人： Herbert Bruder , Rainer Raupach
IPC分类号： G06K9/00
CPC分类号： G06T5/002 , G06T5/50 , G06T11/005 , G06T2207/10081 , G06T2207/10144 , G06T2207/20012 , G06T2207/20056 , G06T2207/20216 , G06T2207/30004
摘要： Method for the noise reduction of CT image data and an image processing system are disclosed, with a scanning of an examination object and generation of at least two CT image data records each taking place on the basis of a different x-ray energy spectrum. In at least one embodiment, a break-down of the data image records into at least two broken-down image data records takes place in each instance, with a lowest local frequency band (f(1)) with the index k=1 and at least one high local frequency band (f(k)) with the index k=2 to N. In at least one embodiment, the determination of the noise into at least one of the image data records per x-ray energy spectrum and calculation of at least one new image data record takes place in each instance by using an unchanged broken-down image data record with the lowest local frequency band and an image data record, generated from a noise-minimized weighted combination of broken-down image data records, which originate from the scannings using different x-ray energy spectra.
摘要翻译：公开了用于CT图像数据的降噪的方法和图像处理系统，其中扫描检查对象并且基于不同的x射线能量谱产生至少两个CT图像数据记录。在至少一个实施例中，数据图像记录分解成至少两个分解图像数据记录，每个情况下都具有索引k = 1的最低本地频带（f（1）），并且至少一个具有索引k = 2至N的高本地频带（f（k））。在至少一个实施例中，将噪声确定为每个x射线能谱和计算中的至少一个图像数据记录至少一个新的图像数据记录在每个实例中通过使用从分解图像数据记录的噪声最小化的加权组合产生的具有最低本地频带和图像数据记录的未变分解图像数据记录来进行，其来源于使用不同x射线能谱的扫描。

10. 发明授权

US08605977B2 Iterative CT image filter for noise reduction 有权
标题翻译：用于降噪的迭代CT图像滤波器
公开(公告)号：US08605977B2
公开(公告)日：2013-12-10
申请号：US12874302
申请日：2010-09-02
申请人： Herbert Bruder , Rainer Raupach
发明人： Herbert Bruder , Rainer Raupach
IPC分类号： G06K9/00
CPC分类号： A61B6/032 , A61B6/4014 , A61B6/482 , A61B6/507 , G06T5/002 , G06T2207/10081 , G06T2207/20012 , G06T2207/30004 , H04N1/409
摘要： A method is disclosed for reconstruction of image data of an examination object from measured data, wherein the measured data was captured during a relative rotational motion between a radiation source of a computed tomography system and the examination object. Image data of the examination object is determined from the measured data. In at least one embodiment, new image data is obtained by noise-reducing processing of the image data, in which weighted high-pass filtering of the image data is performed, the weighting taking account of differences between pixel values of different pixels such that increasing differences result in a weaker high-pass effect. A noise-reducing smoothing of the image data is performed using the weighted high-pass filtering.
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捕获测量数据。从测量数据确定检查对象的图像数据。在至少一个实施例中，通过对图像数据进行加权高通滤波的图像数据的噪声降低处理来获得新的图像数据，加权考虑不同像素的像素值之间的差异，使得增加差异导致较弱的高通效应。使用加权高通滤波来执行图像数据的降噪平滑处理。

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