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11. 发明授权

US08306303B2 Method for improving the quality of computed tomography image series by image processing and CT system comprising a computational unit 有权
标题翻译：通过图像处理提高计算机断层摄影图像序列的质量的方法和包括计算单元的CT系统
公开(公告)号：US08306303B2
公开(公告)日：2012-11-06
申请号：US12314967
申请日：2008-12-19
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach
IPC分类号： A61B6/03
CPC分类号： A61B6/507 , A61B6/481 , A61B6/504 , A61B6/541 , G06T5/002 , G06T5/10 , G06T11/006 , G06T2207/10081
摘要： A method, a computational unit and a CT system are disclosed for improving the quality of CT image series. In at least one embodiment, the method includes scanning an examination object over a period of time which permits the acquisition of at least two temporally offset projection data records of an identical recording region; generating at least two temporally offset tomographic image data records, each having a multiplicity of pixels, by reconstructing the projection data records; transforming the image data records into transformation data records of at least two spatial frequency ranges; calculating temporal fitted values of the transformation data records for some of the spatial frequency ranges, and replacing the values of the transformation data records which were fitted by the calculated fitted values; performing an inverse transform of the transformation data records with the fitted values to form new image data records; and displaying the new image data records.
摘要翻译：公开了一种提高CT图像系列质量的方法，计算单元和CT系统。在至少一个实施例中，该方法包括在允许获取相同记录区域的至少两个时间偏移的投影数据记录的一段时间内扫描检查对象; 通过重建投影数据记录来产生每个具有多个像素的至少两个时间偏移的断层图像数据记录; 将图像数据记录转换成至少两个空间频率范围的变换数据记录; 计算一些空间频率范围的变换数据记录的时间拟合值，并替换由计算的拟合值拟合的变换数据记录的值; 用拟合值对变换数据记录进行逆变换，形成新的图像数据记录; 并显示新的图像数据记录。

12. 发明申请

US20100027736A1 Method for producing tomographic images, control device, tomography unit and computer program product 有权
标题翻译：断层摄影图像的制作方法，控制装置，断层摄像机和计算机程序产品
公开(公告)号：US20100027736A1
公开(公告)日：2010-02-04
申请号：US12458806
申请日：2009-07-23
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach
IPC分类号： A61B6/03
CPC分类号： A61B5/0456 , A61B6/027 , A61B6/032 , A61B6/503 , A61B6/504 , A61B6/541
摘要： A method is disclosed for producing tomographic images relating to different movement phases of a periodically moving object with the use of a tomography unit that includes a recording system that is arranged rotatably about a z-axis of the tomography unit, the recording system including an X-ray tube to which a tube current can be applied and a detector (17, 18) for acquiring projections. In at least one embodiment, the recording system is initially positioned relative to the object at a first z-position, and projections are acquired from a multiplicity of different projection dimensions at this z-position, in a fashion triggered by a movement signal representing the movement of the object, projections relating to a first movement phase of the object being acquired in a prospectively defined first time window and projections relating to at least a second movement phase of the object being acquired in a prospectively defined second time window. In at least one embodiment, a modulation of the tube current is performed in such a way that different tube current values are set in the first and the second time window to attain a prescribable different signal-to-noise ratio in the produced images. The recording system is then positioned sequentially at further z-positions, and respectively corresponding projections are acquired there for the two movement phases until a prescribed examination area is scanned at the desired z-positions. Tomographic images are reconstructed in real time or subsequently on the basis of the obtained projections.
摘要翻译：公开了一种利用断层摄影单元生成与周期性运动物体的不同移动相位相关的断层图像的方法，所述断层摄影单元包括绕所述断层摄影单元的z轴可旋转地设置的记录系统，所述记录系统包括X 可以施加管电流的射线管和用于获取突起的检测器（17,18）。在至少一个实施例中，记录系统首先在第一z位置处相对于物体定位，并且以该Z位置上的多个不同的投影尺寸获取投影，其方式是由表示物体的移动，与在前瞻性定义的第一时间窗口中获取的物体的第一移动阶段有关的投影以及与在前瞻性定义的第二时间窗口中获取的物体的至少第二移动阶段有关的投影。在至少一个实施例中，以这样的方式执行管电流的调制，使得在第一和第二时间窗中设置不同的管电流值，以在所产生的图像中获得规定的不同的信噪比。然后将记录系统顺序地定位在更进一步的z位置，并且分别在两个移动阶段获取对应的投影，直到在期望的z位置扫描规定的检查区域。断层扫描图像可以实时重建，或随后根据获得的投影进行重构。

13. 发明申请

US20090161935A1 Method for improving the quality of computed tomography image series by image processing and CT system comprising a computational unit 有权
标题翻译：通过图像处理提高计算机断层摄影图像序列的质量的方法和包括计算单元的CT系统
公开(公告)号：US20090161935A1
公开(公告)日：2009-06-25
申请号：US12314967
申请日：2008-12-19
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach
IPC分类号： G06K9/00
CPC分类号： A61B6/507 , A61B6/481 , A61B6/504 , A61B6/541 , G06T5/002 , G06T5/10 , G06T11/006 , G06T2207/10081
摘要： A method, a computational unit and a CT system are disclosed for improving the quality of CT image series. In at least one embodiment, the method includes scanning an examination object over a period of time which permits the acquisition of at least two temporally offset projection data records of an identical recording region; generating at least two temporally offset tomographic image data records, each having a multiplicity of pixels, by reconstructing the projection data records; transforming the image data records into transformation data records of at least two spatial frequency ranges; calculating temporal fitted values of the transformation data records for some of the spatial frequency ranges, and replacing the values of the transformation data records which were fitted by the calculated fitted values; performing an inverse transform of the transformation data records with the fitted values to form new image data records; and displaying the new image data records.
摘要翻译：公开了一种提高CT图像系列质量的方法，计算单元和CT系统。在至少一个实施例中，该方法包括在允许获取相同记录区域的至少两个时间偏移的投影数据记录的时间段上扫描检查对象; 通过重建投影数据记录来产生每个具有多个像素的至少两个时间偏移的断层图像数据记录; 将图像数据记录转换成至少两个空间频率范围的变换数据记录; 计算一些空间频率范围的变换数据记录的时间拟合值，并替换由计算的拟合值拟合的变换数据记录的值; 用拟合值对变换数据记录进行逆变换，形成新的图像数据记录; 并显示新的图像数据记录。

14. 发明申请

US20050163283A1 Method for recording and evaluating image data with the aid of a tomography machine 有权
标题翻译：借助于断层摄影机记录和评估图像数据的方法
公开(公告)号：US20050163283A1
公开(公告)日：2005-07-28
申请号：US11043965
申请日：2005-01-28
申请人： Herbert Bruder , Thomas Flohr , Bjoern Heismann , Rainer Raupach , Karl Stierstorfer
发明人： Herbert Bruder , Thomas Flohr , Bjoern Heismann , Rainer Raupach , Karl Stierstorfer
IPC分类号： A61B6/03 , G01N23/00 , G01N23/06 , G06T1/00 , G21K1/12 , H05G1/60
CPC分类号： A61B6/032 , A61B6/4035 , A61B6/405 , A61B6/482 , Y10S378/901
摘要： A method is for recording and evaluating image data with the aid of a tomography machine. At least two recordings with different spectral distribution are made of an examination area of an object. Further, measured data obtained from the two recordings are evaluated such that additional information relating to the examination area and/or a specific representation of the image of the examination area are/is obtained from the different spectral distributions. The tomography machine includes at least two separate recording systems. Further, it is operated such that the two recording systems operate with a different spectral distribution. As such, the additional information and the specific representation of an image can be obtained in conjunction with a reduced scanning time.
摘要翻译：一种用于通过断层摄影机记录和评估图像数据的方法。具有不同光谱分布的至少两个记录由对象的检查区域构成。此外，评估从两个记录获得的测量数据，使得从不同的光谱分布获得与检查区域相关的附加信息和/或检查区域的图像的特定表示。断层摄影机包括至少两个单独的记录系统。此外，其操作使得两个记录系统以不同的光谱分布进行操作。因此，附加信息和图像的具体表示可以结合减少的扫描时间来获得。

15. 发明授权

US06901130B2 Retrospective and/or window-controlled filtering of images for adapting sharpness and noise in computed tomography 有权
标题翻译：用于在计算机断层摄影中适应锐度和噪声的图像的回溯和/或窗口控制滤波
公开(公告)号：US06901130B2
公开(公告)日：2005-05-31
申请号：US10644740
申请日：2003-08-21
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Stefan Schaller
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Stefan Schaller
IPC分类号： A61B6/03 , G06T1/00 , G06T5/00 , G06T5/20 , G06T11/00
CPC分类号： G06T11/008 , G06T5/007 , G06T2207/10081 , Y10S378/901
摘要： A method is for window-controlled filtering of CT images. A CT raw data record is acquired, for example, with the aid of a CT unit or of a C-arc unit. A primary data record is then reconstructed from the CT raw data record by way of, for example, a sharp convolution core and, for example, a narrow slice sensitivity profile. A transfer function is then provided as functional relationship between window width and image sharpness. The image sharpness of the CT image of a selected slice is then automatically calculated, situated in the primary data record, as a function of a selected window width for the selected slice by way of an image processing procedure on the basis of the transfer function.
摘要翻译：一种用于CT图像窗口控制滤波的方法。例如，借助于CT单元或C弧单元获取CT原始数据记录。然后，通过例如锐利的卷积核心和例如窄的片段灵敏度轮廓，从CT原始数据记录重构主数据记录。然后提供传递函数作为窗口宽度和图像清晰度之间的功能关系。然后，通过基于传递函数的图像处理过程，将所选切片的CT图像的图像清晰度自动计算为位于主数据记录中的所选切片的选定窗口宽度的函数。

16. 发明授权

US06819735B2 Histogram-based image filtering in computed tomography 有权
公开(公告)号：US06819735B2
公开(公告)日：2004-11-16
申请号：US10606798
申请日：2003-06-27
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach
IPC分类号： A61B603
CPC分类号： G06T5/007 , G06T11/008 , G06T2207/10081 , Y10S378/901
摘要： A method is for organ-specific image optimization in computed tomography. In this case, the HU values of a layer of the body previously recorded with a CT device are calculated and, on this basis, a first CT image is created. For this first CT image, a histogram is also created, in which the frequency distribution of the HU values is reproduced. In a histogram, at least one organ-specific HU region is defined and the latter is allocated an HU-dependent transfer function. Furthermore, a second CT image is created on the basis of the previously calculated HU values for the layer of the body which has been recorded. The first and second CT image are filtered with the HU-dependent transfer function and, finally, the filtered first CT image is mixed with the filtered second CT image.

17. 发明授权

US09498177B2 Contrast-dependent regularization strength in the iterative reconstruction of CT images 有权
标题翻译： CT图像迭代重建中的对比度依赖正则化强度
公开(公告)号：US09498177B2
公开(公告)日：2016-11-22
申请号：US12729272
申请日：2010-03-23
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Martin Sedlmair , Heinrich Wallschlager
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Martin Sedlmair , Heinrich Wallschlager
IPC分类号： G06K9/00 , A61B6/00 , A61B6/03 , G06T11/00
CPC分类号： A61B6/481 , A61B6/032 , A61B6/4014 , A61B6/4441 , A61B6/482 , A61B6/503 , A61B6/504 , A61B6/507 , A61B6/541 , G06T11/006 , G06T2211/424
摘要： A method is disclosed for reconstructing image data of an examination object from measured data, the measured data being captured during a rotating movement of a radiation source of a computed tomography system around the examination object. In at least one embodiment, different iteration images of the examination object are determined successively from the measured data by way of an iterative algorithm, wherein with the iterative algorithm the current iteration image at any one time is high-pass-filtered and weighted as a function of contrast using a variable which contains contrast information relating to the current iteration image at that time.
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，所测量的数据在计算机断层扫描系统的辐射源围绕检查对象的旋转运动期间被捕获。在至少一个实施例中，通过迭代算法从测量数据连续地确定检查对象的不同迭代图像，其中利用迭代算法，任何时间的当前迭代图像被高通滤波并加权为使用包含与当时的当前迭代图像有关的对比度信息的变量的对比度的功能。

18. 发明授权

US08588493B2 CT image reconstruction for improving temporal resolution in cardio CT 有权
标题翻译：用于改善心脏CT时间分辨率的CT图像重建
公开(公告)号：US08588493B2
公开(公告)日：2013-11-19
申请号：US12849082
申请日：2010-08-03
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Karl Stierstorfer
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Karl Stierstorfer
IPC分类号： G06K9/00
CPC分类号： A61B6/032 , A61B5/0456 , A61B6/4014 , A61B6/482 , A61B6/503 , A61B6/507 , G06T11/006 , G06T2211/412 , G06T2211/424 , G06T2211/436
摘要： A method is disclosed for reconstructing image data of a moving examination object from measurement data, wherein the measurement data was captured in the course of a relative rotational movement between a radiation source of a computed tomography system and the examination object. In at least one embodiment of the method, a first image of the examination object is calculated from a complete measurement data record of the measurement data for an image reconstruction and a second image of the examination object is calculated from an incomplete measurement data record of the measurement data for an image reconstruction. Frequency splitting of the first and second images takes place respectively in at least one low-frequency and one higher-frequency component and the image data of the second image is supplemented in the low-frequency component with image data of the low-frequency component of the first image. In a further processing step the second image thus supplemented is improved using the first image, in that errors due to the incompleteness of the measurement data record of the second image are reduced.
摘要翻译：公开了一种用于从测量数据重建运动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的过程中捕获测量数据。在该方法的至少一个实施例中，根据用于图像重构的测量数据的完整测量数据记录来计算检查对象的第一图像，并且从不完整的测量数据记录计算检查对象的第二图像用于图像重建的测量数据。第一和第二图像的频率分割分别发生在至少一个低频和一个较高频分量中，并且第二图像的图像数据在低频分量中被补充，低频分量的图像数据是第一张图片。在另外的处理步骤中，使用第一图像来改善如此补充的第二图像，因为减少了由于第二图像的测量数据记录的不完备性造成的错误。

19. 发明授权

US08442293B2 CT image reconstruction in the extended field of view 有权
标题翻译： CT图像重建在扩展视野中
公开(公告)号：US08442293B2
公开(公告)日：2013-05-14
申请号：US13018724
申请日：2011-02-01
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Karl Stierstorfer
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Karl Stierstorfer
IPC分类号： G06K9/00 , A61B6/00
CPC分类号： A61B6/4014 , A61B6/027 , A61B6/032 , A61B6/4441 , A61B6/482 , A61B6/507 , G01N23/046 , G01N2223/401 , G01N2223/419 , G01N2223/612 , G06T11/006 , G06T2211/432
摘要： A method is disclosed for reconstructing image data of an examination subject from measured data, wherein the measured data was acquired in the course of a relative rotational movement between a radiation source of a computed tomography system and the examination subject. A limited area between the radiation source and a detector represents a field of view in respect of which measured data can be acquired, and parts of the examination subject were located at least temporarily outside the field of view in the course of the measured data acquisition. In at least one embodiment, first image data is reconstructed from the measured data, and a boundary of the examination subject is determined with the aid of the first image data. The first image data is subsequently modified using the determined boundary, and projection data is calculated from the modified first image data. The measured data is modified using the projection data, and finally second image data is reconstructed from the modified measured 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与检查对象之间的相对旋转运动的过程中获取测量数据。辐射源和检测器之间的有限区域表示可以获取测量数据的视野，并且在测量数据采集的过程中检查对象的部分至少临时定位在视场外。在至少一个实施例中，从测量数据重建第一图像数据，借助于第一图像数据确定检查对象的边界。随后使用所确定的边界修改第一图像数据，并且从修改的第一图像数据计算投影数据。使用投影数据修改测量数据，最后从修改的测量数据重建第二图像数据。

20. 发明授权

US07940884B2 Method and image reconstruction device for reconstructing image data 有权
标题翻译：用于重建图像数据的方法和图像重建装置
公开(公告)号：US07940884B2
公开(公告)日：2011-05-10
申请号：US12729280
申请日：2010-03-23
申请人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Karl Stierstorfer , John Sunnegårdh
发明人： Herbert Bruder , Thomas Flohr , Rainer Raupach , Karl Stierstorfer , John Sunnegårdh
IPC分类号： A61B6/00
CPC分类号： G06T11/006 , G06T2211/424
摘要： A method and an image reconstruction device are disclosed for reconstructing image data on the basis of input projection data obtained via an X-ray computerized tomography system. A target convolutional kernel is selected, which, when reconstructing image data from the input projection data using simple filtered back projection, would lead to target image characteristics. Image data is then reconstructed using an iterative reconstruction method of at least one embodiment. In at least one embodiment, the method includes a) reconstructing image data of a first iterative stage from the input projection data, b) generating synthetic projection data on the basis of the image data of the current iterative stage, c) forming difference projection data on the basis of the input projection data and the synthetic projection data, d) generating residue image data from the difference projection data, e) combining the residue image data with the image data of the current iterative stage to form image data of an additional iterative stage, wherein the image data of the current iterative stage is subjected to filtering before or during combination with the residue image data by using a regularization convolutional kernel which is determined on the basis of the selected target convolutional kernel, and f) repeating b) to e) until a termination condition occurs.
摘要翻译：公开了一种基于通过X射线计算机断层摄影系统获得的输入投影数据来重构图像数据的方法和图像重建装置。选择目标卷积核，当使用简单的过滤反投影从输入投影数据重建图像数据时，将导致目标图像特征。然后使用至少一个实施例的迭代重建方法来重建图像数据。在至少一个实施例中，该方法包括：a）从输入的投影数据重建第一迭代阶段的图像数据，b）基于当前迭代阶段的图像数据产生合成投影数据，c）形成差分投影数据基于输入投影数据和合成投影数据，d）从差分投影数据生成残差图像数据，e）将残差图像数据与当前迭代阶段的图像数据组合以形成附加迭代图像数据阶段，其中当前迭代阶段的图像数据在与剩余图像数据组合之前或之后通过使用基于所选择的目标卷积核确定的正则化卷积核进行滤波，以及f）重复b）至 e）直到发生终止条件。

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