公开(公告)号：US20120294414A1

公开(公告)日：2012-11-22

申请号：US13503870

申请日：2010-10-26

申请人： Thomas Koehler

发明人： Thomas Koehler

IPC分类号： A61B6/03 ,  G21K1/02

CPC分类号： A61B6/032 ,  A61B6/4035 ,  A61B6/4233 ,  A61B6/5264 ,  A61B6/542 ,  G06T11/006

摘要： The invention relates to a computed tomography apparatus comprising a radiation source (2) and a detector (6) for generating detection values depending on a conical radiation beam (4). A weight providing unit (12) provides, for combinations of voxels of an image and detection values, weights for weighting the detection values, and a beam shaper shapes the conical radiation beam (4) such that for at least a part of the detection values the inverse of the variance of a respective detection value is positively correlated with an average of the weights corresponding to the combinations of the voxels, which correspond to the respective detection value, and the respective detection value. This shaping of the conical radiation beam improves the signal-to-noise ratio of the weighted detection values.

摘要翻译： 本发明涉及一种包括辐射源（2）和检测器（6）的计算机断层摄影装置，用于根据锥形辐射束（4）产生检测值。 权重提供单元（12）为图像的体素和检测值的组合提供用于加权检测值的权重，并且束形成器使得锥形辐射束（4）成形，使得对于至少一部分检测值 相应检测值的方差的逆与与对应于各个检测值的体素的组合对应的权重的平均值以及相应的检测值正相关。 锥形辐射束的这种成形改善了加权检测值的信噪比。

公开(公告)号：US20120177274A1

公开(公告)日：2012-07-12

申请号：US13394819

申请日：2010-09-21

申请人： Thomas Koehler ,  Roland Proksa

发明人： Thomas Koehler ,  Roland Proksa

IPC分类号： G06K9/46

CPC分类号： G06T11/008 ,  G06T5/50 ,  G06T2211/421 ,  G06T2211/424

摘要： The invention relates to an image generation system for generating an image of a region of interest. The image generation system comprises a measured data providing unit for providing measured data of the region of interest, a reconstruction unit (12) for reconstructing a first and a second image of the region of interest from the measured data using a first and a second reconstruction method, a noise determination unit (13) for determining first and second noise values for first and second image elements of the first and second image, and an image element combining unit (14) for combining corresponding first and second image elements into combined image elements forming a combined image based on the first and second noise values. By combining corresponding image elements of two differently reconstructed images based on determined noise values, a combined image of a region of interest can be generated with an improved quality.

摘要翻译： 本发明涉及一种用于产生感兴趣区域的图像的图像生成系统。 图像生成系统包括测量数据提供单元，用于提供感兴趣区域的测量数据;重建单元（12），用于使用第一和第二重构从所测量的数据重构感兴趣区域的第一和第二图像 方法，用于确定第一和第二图像的第一和第二图像元素的第一和第二噪声值的噪声确定单元（13）和用于将对应的第一和第二图像元素组合成组合图像元素的图像元素合成单元（14） 基于第一和第二噪声值形成组合图像。 通过基于确定的噪声值组合两个不同重建图像的相应图像元素，可以以改进的质量生成感兴趣区域的组合图像。

公开(公告)号：US20120141006A1

公开(公告)日：2012-06-07

申请号：US13388068

申请日：2010-07-09

申请人： Thomas Koehler ,  Claas Bontus

发明人： Thomas Koehler ,  Claas Bontus

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  A61B6/5258 ,  G06T2211/424 ,  G06T2211/432

摘要： A method and system to perform region-of-interest (ROI) reconstruction is provided, even if the original projection data are truncated. The reconstruction is performed on a superset of the ROI, including the ROI as well as other areas which are outside the scan field-of-view of the imaging system but still within the imaging bore.

摘要翻译： 即使原始投影数据被截断，也提供了执行感兴趣区域（ROI）重构的方法和系统。 重建在ROI的超集上执行，包括ROI以及在成像系统的扫描视场外但仍在成像孔内的其它区域。

公开(公告)号：US08184891B2

公开(公告)日：2012-05-22

申请号：US12445761

申请日：2007-10-12

申请人： Thomas Koehler ,  Roland Proksa

发明人： Thomas Koehler ,  Roland Proksa

IPC分类号： G06K9/00

CPC分类号： G06T11/005 ,  G06T2211/421

摘要： The present invention relates to an imaging system for imaging a region of interest comprising an illumination unit and a detection unit. The imaging system further comprises a grouping unit for grouping the detection values, wherein each group comprises at least one alpha detection value and at least one beta detection value (103). At least one alpha aperture weighting value for the at least one alpha detection value of a group is determined by using at least one position of at least one ray within the aperture (104). Furthermore, at least one beta aperture weighting value for the at least one beta detection value of a group is approximately determined using the at least one alpha aperture weighting value of the group (105). The detection values are than aperture weighted using aperture weighting values (106). The region of interest is reconstructed by backprojecting the weighted detection values (107).

摘要翻译： 本发明涉及一种用于对包括照明单元和检测单元的感兴趣区域成像的成像系统。 成像系统还包括用于对检测值进行分组的分组单元，其中每组包括至少一个α检测值和至少一个β检测值（103）。 通过使用孔径（104）内的至少一个射线的至少一个位置来确定组的至少一个α检测值的至少一个α孔径权重值。 此外，使用组（105）的至少一个阿尔法孔径权重值近似确定组的至少一个β检测值的至少一个β孔径加权值。 检测值比使用孔径加权值的孔径加权（106）。 通过反投影加权检测值来重建感兴趣区域（107）。

公开(公告)号：US08166249B2

公开(公告)日：2012-04-24

申请号：US12399416

申请日：2009-03-06

申请人： Thomas Koehler ,  Siegmund Schlechter

发明人： Thomas Koehler ,  Siegmund Schlechter

IPC分类号： G06F12/00

CPC分类号： G06F12/123 ,  G06F12/1027

摘要： A method to perform a least recently used (LRU) algorithm for a co-processor is described, which co-processor in order to directly use instructions of a core processor and to directly access a main storage by virtual addresses of said core processor comprises a TLB for virtual to absolute address translations plus a dedicated memory storage also including said TLB, wherein said TLB consists of at least two zones which can be assigned in a flexible manner more than one at a time. Said method to perform a LRU algorithm is characterized in that one or more zones are replaced dependent on an actual compression service call (CMPSC) instruction.

摘要翻译： 描述了为协处理器执行最近最少使用（LRU）算法的方法，其中为了直接使用核心处理器的指令并且通过所述核心处理器的虚拟地址直接访问主存储器的协处理器包括 用于虚拟到绝对地址转换的TLB以及还包括所述TLB的专用存储器存储器，其中所述TLB由至少两个可以以多于一个的灵活方式分配的区域组成。 所述执行LRU算法的方法的特征在于，取决于实际压缩服务呼叫（CMPSC）指令来替换一个或多个区域。

公开(公告)号：US07970195B2

公开(公告)日：2011-06-28

申请号：US11908294

申请日：2006-03-07

申请人： Andy Ziegler ,  Thomas Koehler ,  Roland Proksa

发明人： Andy Ziegler ,  Thomas Koehler ,  Roland Proksa

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  G06T2211/424

摘要： The invention relates to a device and a method for the iterative reconstruction of the attenuation coefficients μj in a tomographic image of an object (1) from projection measurements mi. In the update equation for μjn during the n-th iteration the backprojected error (mi−mi−(μjn)) is weighted by a voxel dependent factor Formula (I). Such a voxel dependent update may particularly be included in the algorithms of ART or ML.

摘要翻译： 本发明涉及一种用于从投影测量mi在物体（1）的断层图像中迭代重建衰减系数μj的装置和方法。 在第n次迭代期间的μjn的更新方程中，反投影误差（mi-mi-（μjn））由体素因子因子公式（I）加权。 这种体素相关更新可以特别地包括在ART或ML的算法中。

公开(公告)号：US20100322514A1

公开(公告)日：2010-12-23

申请号：US12521599

申请日：2007-12-19

申请人： Thomas Koehler

发明人： Thomas Koehler

IPC分类号： G06K9/34

CPC分类号： G06T11/005 ,  A61B6/5258

摘要： The present invention relates to an apparatus for producing a corrected image of a region of interest from acquired projection data (60), wherein an uncorrected intermediate image (74) is reconstructed. The uncorrected intermediate image (74) is corrected and image elements of the corrected intermediate image (85) are classified. Image elements of the corrected 5 intermediate image (85) that are of a high density or low density class are replaced by image elements having values depending on values of the low density class to generate a synthetic image (90). Synthetic projection data (96) are generated by forward projecting the synthetic image (90), and acquired projection data contributing to the high density class are replaced by corresponding synthetic projection data (96) to generate corrected projection data (112). 10 The corrected projection data (112) are used for reconstructing the corrected image.

摘要翻译： 本发明涉及一种用于从所获取的投影数据（60）产生感兴趣区域的校正图像的装置，其中重建未校正的中间图像（74）。 对未校正的中间图像（74）进行校正，校正的中间图像（85）的图像元素被分类。 具有高密度或低密度等级的校正的5中间图像（85）的图像元素由具有取决于低密度等级的值的值的图像元素代替以产生合成图像（90）。 合成投影数据（96）通过前向投影合成图像（90）产生，并且由相应的合成投影数据（96）代替有助于高密度等级的获取的投影数据以产生校正投影数据（112）。 校正投影数据（112）用于重建校正图像。

公开(公告)号：US07839967B2

公开(公告)日：2010-11-23

申请号：US11721165

申请日：2005-12-08

申请人： Michael Grass ,  Thomas Koehler

发明人： Michael Grass ,  Thomas Koehler

IPC分类号： G01N23/00

CPC分类号： G01N23/046 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4028 ,  A61B6/4488 ,  G01N2223/419

摘要： There is provided an electron computer tomography method for recording a moving object (27), in which an electron beam is deflected onto an anode arc (14) in order to generate X-ray radiation which passes through an object (27) and is picked up by a detector device (28), wherein the X-ray radiation leaves the anode arc (14) in the form of a fan-shaped beam having a source trajectory (40) in the form of a circle segment around the object (27) and the starting point (41) of the source trajectory (40) can be changed. Also provided is an electron computer tomograph for recording a moving object (27), comprising an electron gun (8), a focusing coil (12), a curvature coil (16), an anode arc (14) for generating an X-ray beam by being struck by an electron beam of the electron gun (8), and a detector device (28) for detecting the X-ray radiation transmitted through a volume (26), said X-ray radiation having a source trajectory (40) in the form of a circle segment at the anode arc (14) and a variable starting point (41) of the source trajectory (40).

摘要翻译： 提供了一种用于记录运动物体（27）的电子计算机断层摄影方法，其中电子束偏转到阳极弧（14）上，以便产生穿过物体（27）并被拾取的X射线辐射 （28），其中X射线辐射以具有围绕物体（27）的圆弧形式的源轨迹（40）的扇形梁的形式离开阳极弧（14） ）和源轨迹（40）的起点（41）可以改变。 还提供了一种用于记录运动物体（27）的电子计算机断层摄影机，包括电子枪（8），聚焦线圈（12），曲率线圈（16），用于产生X射线的阳极弧 通过被电子枪（8）的电子束撞击的光束;以及用于检测透过体积（26）的X射线辐射的检测器装置（28），所述X射线辐射具有源轨迹（40） 在阳极弧（14）处的圆形段和源轨迹（40）的可变起点（41）的形式。

公开(公告)号：US07778383B2

公开(公告)日：2010-08-17

申请号：US12293564

申请日：2007-03-14

申请人： Thomas Koehler ,  Jens-Peter Schlomka

发明人： Thomas Koehler ,  Jens-Peter Schlomka

IPC分类号： A61B6/00

CPC分类号： G01T1/2985 ,  A61B6/032 ,  A61B6/037 ,  A61B6/4021 ,  A61B6/4028 ,  A61B6/482 ,  G01V5/0041 ,  G01V5/005 ,  Y10S378/901

摘要： It is described a method and a CT system for measuring dual-energy X- ray attenuation data of an object. The CT system comprises a rotatable holder, an X-ray source comprising two different X-ray focus points, and an X-ray detection device comprising a plurality of detector elements exhibiting different spectral sensitivities. The method comprises the steps of (a) adjusting the X-ray source such that it emits X-rays originating a first focus point, (b) acquiring first attenuation data separately with first detector elements and with second detector elements, (c) moving the X-ray focus discretely to a second focus point, and (d) acquiring second attenuation data separately with both types of detector elements. Thereby the two focus points are spatially separated from each such that a first beam path originating from the first focus point penetrates a certain voxel within the object and impinges on a first detector element and a second beam path originating from the second X-ray focus point penetrates the same voxel and impinges on a second detector element.

摘要翻译： 描述了用于测量物体的双能X射线衰减数据的方法和CT系统。 CT系统包括可旋转保持器，包括两个不同X射线焦点的X射线源和包括表现出不同光谱灵敏度的多个检测器元件的X射线检测装置。 该方法包括以下步骤：（a）调整X射线源，使其发射源自第一焦点的X射线，（b）分别用第一检测器元件和第二检测器元件获取第一衰减数据，（c）移动 所述X射线焦点离散地到达第二焦点，以及（d）分别用两种类型的检测器元件获取第二衰减数据。 从而两个聚焦点在空间上分离开，使得源自第一聚焦点的第一光束路径穿透物体内的某个体素并撞击在第一X射线焦点上的第一检测器元件和第二光束路径 穿透相同的体素并撞击在第二检测器元件上。

公开(公告)号：US20100166139A1

公开(公告)日：2010-07-01

申请号：US12293564

申请日：2007-03-14

申请人： Thomas Koehler ,  Jens-Peter Schlomka

发明人： Thomas Koehler ,  Jens-Peter Schlomka

IPC分类号： H05G1/60 ,  G01T1/29

CPC分类号： G01T1/2985 ,  A61B6/032 ,  A61B6/037 ,  A61B6/4021 ,  A61B6/4028 ,  A61B6/482 ,  G01V5/0041 ,  G01V5/005 ,  Y10S378/901

摘要： It is described a method and a CT system for measuring dual-energy X- ray attenuation data of an object. The CT system comprises a rotatable holder, an X-ray source comprising two different X-ray focus points, and an X-ray detection device comprising a plurality of detector elements exhibiting different spectral sensitivities. The method comprises the steps of (a) adjusting the X-ray source such that it emits X-rays originating a first focus point, (b) acquiring first attenuation data separately with first detector elements and with second detector elements, (c) moving the X-ray focus discretely to a second focus point, and (d) acquiring second attenuation data separately with both types of detector elements. Thereby the two focus points are spatially separated from each such that a first beam path originating from the first focus point penetrates a certain voxel within the object and impinges on a first detector element and a second beam path originating from the second X-ray focus point penetrates the same voxel and impinges on a second detector element.

摘要翻译： 描述了用于测量物体的双能X射线衰减数据的方法和CT系统。 CT系统包括可旋转保持器，包括两个不同X射线焦点的X射线源和包括表现出不同光谱灵敏度的多个检测器元件的X射线检测装置。 该方法包括以下步骤：（a）调整X射线源，使其发射源自第一焦点的X射线，（b）分别用第一检测器元件和第二检测器元件获取第一衰减数据，（c）移动 所述X射线焦点离散地到达第二焦点，以及（d）分别用两种类型的检测器元件获取第二衰减数据。 从而两个聚焦点在空间上分离开，使得源自第一聚焦点的第一光束路径穿透物体内的某个体素并撞击在第一X射线焦点上的第一检测器元件和第二光束路径 穿透相同的体素并撞击在第二检测器元件上。