公开(公告)号：US07315604B2

公开(公告)日：2008-01-01

申请号：US11360772

申请日：2006-02-24

申请人： Rainer Raupach

发明人： Rainer Raupach

IPC分类号： H05G1/00 ,  H05G1/64

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

摘要： A method is disclosed for an x-ray device and a computer tomograph for suppressing beam hardening artifacts in a generated image of an object, for example in a tomogram of a patient. In the method, N measured values are acquired relating to N different energy ranges of the x-radiation. Further, one pseudomonochromatic measured value is calculated in each case from the N measured values such that there is generated from different projection directions on the basis of the calculated pseudomonochromatic measured values, an image in which beam hardening artifacts are substantially suppressed.

摘要翻译： 公开了一种用于例如在患者的断层图像中的用于抑制所生成的对象的图像中的束固化伪影的X射线装置和计算机断层摄影机的方法。 在该方法中，获得与X辐射的N个不同能量范围相关的N个测量值。 此外，从N个测量值计算出每个情况下的一个假单色测量值，使得根据所计算的伪染色测量值从不同的投影方向产生，其中基本上抑制了束固化伪影的图像。

公开(公告)号：US07289595B2

公开(公告)日：2007-10-30

申请号：US11418656

申请日：2006-05-05

申请人： Rainer Raupach ,  Andreas Schaller ,  Christoph Süss ,  Heiko Wolf

发明人： Rainer Raupach ,  Andreas Schaller ,  Christoph Süss ,  Heiko Wolf

IPC分类号： A61B6/00

CPC分类号： A61B6/032 ,  A61B6/583 ,  Y10S378/901

摘要： In method and module for calculation of an orthogonal x-ray attenuation of a subject using a measured reference x-ray attenuation in computed tomography, the reference x-ray attenuation and the orthogonal attenuation are provided as input quantities for an automatic dose control of the computed tomography apparatus. The positioning of the subject with regard to the rotation axis of the computed tomography apparatus is taken into account in the calculation of the orthogonal x-ray attenuation detection of the table height of the subject table.

摘要翻译： 在计算机断层摄影中使用测量的参考x射线衰减来计算受试者的正交x射线衰减的方法和模块中，提供参考x射线衰减和正交衰减作为输入量，用于自动剂量控制 计算机断层摄影装置。 在计算被摄体台的台面高度的正交x射线衰减检测的计算中，考虑到被检体相对于计算机断层摄影装置的旋转轴的位置。

公开(公告)号：US20070189635A1

公开(公告)日：2007-08-16

申请号：US11703243

申请日：2007-02-07

申请人： Anja Borsdorf ,  Rainer Raupach

发明人： Anja Borsdorf ,  Rainer Raupach

IPC分类号： G06K9/40 ,  G06K9/00

CPC分类号： G06T5/002 ,  G06T5/10 ,  G06T5/20 ,  G06T5/50 ,  G06T11/005 ,  G06T2207/10072 ,  G06T2207/20016 ,  G06T2207/20064 ,  G06T2207/30004

摘要： A method for noise reduction in imaging methods is disclosed. In at least one embodiment, two statistically independent image data records in the same situation are generated, are subjected to wavelet transformation characterized by a low-pass filter and a high-pass filter, the correlation between the independent image data records is determined from respectively corresponding wavelet coefficients, and during the back transformation, wavelet coefficients with less correlation are given a lower weighting than wavelet coefficients with greater correlation. Further, the rating of the correlations and the weighting of the wavelet coefficients during the back transformation in the case of wavelet coefficients which have been produced through a combination of high-pass and low-pass filtering are independent of the rating of the correlations and the weighting of the wavelet coefficients during the back transformation of the wavelet coefficients which have been produced through pure high-pass filtering.

摘要翻译： 公开了一种成像方法中降噪的方法。 在至少一个实施例中，产生了相同情况下的两个统计上独立的图像数据记录，经受由低通滤波器和高通滤波器表征的小波变换，独立图像数据记录之间的相关性分别确定 相应的小波系数，并且在反向变换期间，具有较小相关性的小波系数被给予比具有更大相关性的小波系数更低的权重。 此外，在通过高通和低通滤波的组合产生的小波系数的情况下，反向变换期间的相关性和小波系数的加权的等级与相关性的等级无关，并且 在通过纯高通滤波产生的小波系数的反向变换期间小波系数的加权。

公开(公告)号：US08355555B2

公开(公告)日：2013-01-15

申请号：US12854341

申请日：2010-08-11

申请人： Yunqiang Chen ,  Tong Fang ,  Bernhard Schmidt ,  Rainer Raupach

发明人： Yunqiang Chen ,  Tong Fang ,  Bernhard Schmidt ,  Rainer Raupach

IPC分类号： G06K9/00

CPC分类号： G06T5/002 ,  G06T5/50 ,  G06T2207/10072 ,  G06T2207/20076 ,  G06T2207/20192 ,  G06T2207/30004 ,  G06T2207/30016

摘要： A method for enhancing a virtual non-contrast image, includes receiving a pair of dual scan CT images and calculating a virtual non-contrast image from the pair of CT images using known tissue attenuation coefficients. A conditional probability distribution is estimated for tissue at first and second points in each of the pair of CT images and the virtual non-contrast image as being the same type. A conditional probability distribution for tissue is estimated at the first and second points in each of the pair of CT images and the virtual non-contrast image as being of different types. An a posteriori probability of the tissue at the first and second points as being the same type is calculated from the conditional probability distributions, and an enhanced virtual non-contrast image is calculated using the a posteriori probability of the tissue at the first and second points as being the same type.

摘要翻译： 一种用于增强虚拟非对比度图像的方法，包括接收一对双扫描CT图像，并使用已知的组织衰减系数从所述一对CT图像计算虚拟非对比度图像。 对于一对CT图像和虚拟非对比度图像中的每一个中的第一和第二点处的组织估计为相同类型的条件概率分布。 在一对CT图像和虚拟非对比度图像中的每一个中的第一和第二点处估计组织的条件概率分布为不同类型。 根据条件概率分布计算第一和第二点处的组织作为相同类型的后验概率，并且使用在第一和第二点处的组织的后验概率来计算增强的虚拟非对比度图像 作为同一类型。

公开(公告)号：US20100278411A1

公开(公告)日：2010-11-04

申请号：US12770825

申请日：2010-04-30

申请人： Bernhard Krauss ,  Rainer Raupach

发明人： Bernhard Krauss ,  Rainer Raupach

IPC分类号： G06K9/00

CPC分类号： G06T5/009 ,  A61B6/03 ,  A61B6/507 ,  G06T5/50 ,  G06T2207/10081 ,  G06T2207/30004

摘要： A method is disclosed for processing an output image of an examination object, with the output image having been reconstructed from measuring data acquired during a relative rotational movement between a radiation source of a computed tomography system and the examination object. An image frequency division of an output image takes place in at least a first and a second image. In at least one embodiment, the first image is changed by way of a first function, with the first function effecting a contrast intensification within the first image, and the changed first image and the second image are merged together.

摘要翻译： 公开了一种用于处理检查对象的输出图像的方法，其中输出图像已经从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获取的测量数据重构。 输出图像的图像分频发生在至少第一和第二图像中。 在至少一个实施例中，通过第一功能改变第一图像，其中第一功能在第一图像内实现对比度增强，并且将改变的第一图像和第二图像合并在一起。

公开(公告)号：US07561658B2

公开(公告)日：2009-07-14

申请号：US12222349

申请日：2008-08-07

申请人： Eckhard Hempel ,  Martin Hoheisel ,  Stefan Popescu ,  Rainer Raupach

发明人： Eckhard Hempel ,  Martin Hoheisel ,  Stefan Popescu ,  Rainer Raupach

IPC分类号： A61B6/00

CPC分类号： A61B6/032 ,  A61B6/037 ,  A61B6/484 ,  A61B6/503 ,  A61B6/507

摘要： A method and an x-ray computed tomography system are disclosed for visualizing at least two different types of cardiac tissue, such as normally perfused tissue, hypoperfused tissue and scarred tissue. In at least one embodiment, this is done by use of an imaging tomographic recording technique with the aid of x-ray radiation, wherein at least one cardiac region of a patient is scanned by x-ray radiation which passes through a first grating for the passing-through x-ray radiation, designed as an absorption grating, prior to reaching the patient, and at least the locally caused phase-shifts of the x-ray radiation in the cardiac region are also made detectable by using a second grating for the passing-through x-ray radiation, designed as a phase grating, downstream of the patient in the emission direction, and the spatial distribution of these shifts is measured and reconstructed, wherein an average specific phase-shift value is assigned to each spatial unit, wherein each of the abovementioned tissue types are assigned to a region of a typical specific phase-shift value and at least one region assigned to a tissue type is optically highlighted in a view of the cardiac region.

摘要翻译： 公开了一种方法和x射线计算机断层摄影系统，用于可视化至少两种不同类型的心脏组织，例如通常灌注的组织，低灌注组织和瘢痕组织。 在至少一个实施例中，这通过使用借助于X射线辐射的成像断层摄影记录技术来完成，其中患者的至少一个心脏区域被x射线辐射扫描，X射线辐射通过第一光栅 在到达患者之前设计为吸收光栅的穿透X射线辐射以及至少在心脏区域中的x射线辐射的局部引起的相移也可以通过使用第二光栅来检测 测量并重构这些偏移的空间分布，其中平均特定相移值被分配给每个空间单元，其中， 其中上述组织类型中的每一种被分配给典型的特定相移值的区域，并且指定为组织类型的至少一个区域在心脏区域的视图中被光学突出显示。

公开(公告)号：US20090161820A1

公开(公告)日：2009-06-25

申请号：US12314892

申请日：2008-12-18

申请人： Rainer Raupach

发明人： Rainer Raupach

IPC分类号： H05G1/60 ,  G06K9/00

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，总是比较一致的射线的投影数据; 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。

公开(公告)号：US07197106B2

公开(公告)日：2007-03-27

申请号：US11252767

申请日：2005-10-19

申请人： Andre Hartung ,  Rainer Raupach ,  Jens-Peter Scharnagl ,  Eberhard Ten Weges

发明人： Andre Hartung ,  Rainer Raupach ,  Jens-Peter Scharnagl ,  Eberhard Ten Weges

IPC分类号： G01N23/08

CPC分类号： G01T1/2985 ,  G01N23/046 ,  G01N2223/419

摘要： A detector and a computed tomography unit are disclosed. The detector includes a first detector region for acquiring projections of a first projection direction, and additionally includes at least a second and a third detector region for acquiring projections of a second and a third projection direction. Given appropriate operation of the detector, it is possible to carry out flexible scanning of an examination area in an optional fashion with a high time resolution, a high volume coverage or with a large coverage of a cross section of the examination area, doing so perpendicular to the system axis of the computed tomography unit.

摘要翻译： 公开了一种检测器和计算机断层摄影单元。 检测器包括用于获取第一投影方向的投影的第一检测器区域，并且另外包括用于获取第二和第三投影方向的投影的至少第二和第三检测器区域。 在检测器的适当操作的情况下，可以以可选方式对检查区进行灵活的扫描，具有高时间分辨率，高体积覆盖或检查区域的横截面的大覆盖范围，这样垂直 到计算机断层摄影单元的系统轴。

公开(公告)号：US20060262897A1

公开(公告)日：2006-11-23

申请号：US11409141

申请日：2006-04-21

申请人： Rainer Raupach

发明人： Rainer Raupach

IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

CPC分类号： A61B6/06 ,  A61B6/032 ,  G21K1/04

摘要： in a diaphragm device for an x-ray apparatus for scanning a subject with a radiation beam and a scanning method using such a diaphragm device, the diaphragm device has at least two diaphragms. For at least one segment of the scan, the radiation beam that has been adjusted with the first diaphragm can be at least partially dynamically masked by the second diaphragm. High adjustment precisions for precise exposure of a measurement field of detector and high adjustment speed for masking of a radiation beam that is not needed for reconstruction of an image, or for reduction of a radiation exposure of the subject can be implemented to equal degree with the two diaphragms that are separate from one another.

摘要翻译： 在用于使用辐射束扫描对象的X射线装置的隔膜装置和使用这种隔膜装置的扫描方法中，隔膜装置具有至少两个隔膜。 对于扫描的至少一个部分，已经用第一隔膜调节的辐射束可以被第二隔膜至少部分地动态地屏蔽。 用于精确曝光检测器的测量场的高调整精度和用于掩蔽重建图像所不需要的辐射束或用于减少对象的辐射照射的高调节速度可以与 两个彼此分开的隔膜。

公开(公告)号：US06819734B2

公开(公告)日：2004-11-16

申请号：US10290520

申请日：2002-11-08

申请人： Rainer Raupach

发明人： Rainer Raupach

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  G06T5/002 ,  G06T5/10 ,  G06T5/20 ,  G06T2207/10081 ,  G06T2207/20032 ,  G06T2207/20192 ,  G06T2207/30004 ,  Y10S378/901

摘要： An algorithmic method is used for suppressing artifacts in computed tomography raw data, on the basis of the determination and subsequent subtraction of a correction sinogram from a measured starting sinogram. The method includes high-pass filtering of a starting sinogram in the channel direction, and low-pass filtering in the projection direction in order to improve the signal-to-noise ratio. Thereafter, the magnitude of a weighted gradient of each data point in the low-pass-filtered sinogram is formed, both in the projection direction and symmetrically about the corresponding channel axis. The data point is eliminated if the change amplitude thereof exceeds a first defined threshold value. Residual data points are removed in the low-pass-filtered sinogram if their amplitude exceeds a second defined threshold value, and low-pass filtering of the resulting sinogram occurs in the form of averaging in the projection direction. The correction sinogram thus obtained is finally subtracted from the starting sinogram.

摘要翻译： 基于来自测量的起始正弦图的确定和随后的校正窦位图的减法，使用算法方法来抑制计算机断层摄影原始数据中的假象。 该方法包括对信道方向上的起始正弦图进行高通滤波，并且在投影方向上进行低通滤波，以提高信噪比。 此后，在投影方向和对应的通道轴上对称地形成低通滤波正弦图中的每个数据点的加权梯度的大小。 如果数据点的变化幅度超过第一定义的阈值，则消除数据点。 如果低通滤波正弦图幅度超过第二定义阈值，则残留数据点被去除，并且以投影方向平均的形式对所得到的正弦图进行低通滤波。 这样得到的校正正弦图最终从起始正弦图中减去。