公开(公告)号：US20110064202A1

公开(公告)日：2011-03-17

申请号：US12992409

申请日：2009-05-08

申请人： Axel Thran ,  Peter Forthmann ,  Roland Proksa ,  Thomas Koehler

发明人： Axel Thran ,  Peter Forthmann ,  Roland Proksa ,  Thomas Koehler

IPC分类号： H01J35/08 ,  H01J35/00 ,  H01J35/06 ,  H01J35/30

CPC分类号： H01J35/10 ,  H01J35/30 ,  H01J2235/086 ,  H05G1/52 ,  H05G1/58

摘要： To scan an object with differently shaped cone beams (112, 122), the present invention provides a CT scanner with a moveable X-ray tube (the meaning of “move the x-ray tube among a plurality of predefined positions” also covers the situation that the anode disk is moved among a plurality of corresponding positions, while the shell of the x-ray tube does not move). The X-ray tube is not only moveable along the axial direction, but also along the radial direction of the CT scanner gantry. The scanner comprises an X-ray tube, which X-ray tube further comprises: an anode disk (100), comprising a plurality of focal tracks (110, 120) each focal track being cone-shaped with an anode angle (114, 124) different from the anode angle(s) of the other focal track(s); and a first cathode (210), configured to emanate an electron beam targeting at least one of the plurality of focal tracks. When different focal tracks are bombarded by electron beams, different X-ray beams (112, 122) with differently shaped cone beams are generated.

摘要翻译： 为了扫描具有不同形状的锥形束（112,122）的物体，本发明提供具有可移动X射线管的CT扫描器（“在多个预定位置中移动x射线管”的含义也覆盖 使得阳极盘在多个对应位置之间移动，而X射线管的外壳不移动的情况）。 X射线管不仅可以沿轴向移动，而且可沿CT扫描仪台架的径向方向移动。 所述扫描器包括X射线管，所述X射线管还包括：阳极盘（100），包括多个焦点轨道（110,120），每个焦点轨道呈圆锥形，具有阳极角（114,124 ）不同于另一个焦点轨道的阳极角度; 以及第一阴极（210），被配置为发射靶向所述多个焦点轨道中的至少一个的电子束。 当不同的焦点轨道被电子束轰击时，产生具有不同形状的锥形束的不同的X射线束（112,122）。

公开(公告)号：US20110044559A1

公开(公告)日：2011-02-24

申请号：US12989794

申请日：2009-05-04

申请人： Klaus Erhard ,  Peter Forthmann ,  Roland Proksa

发明人： Klaus Erhard ,  Peter Forthmann ,  Roland Proksa

IPC分类号： G06K9/40

CPC分类号： G06T11/005 ,  G06T2211/432

摘要： A method includes generating simulated complete projection data based on acquisition projection data, which is incomplete projection data, and virtual projection data, which completes the incomplete projection data and reconstructing the simulated complete projection data to generate volumetric image data. An alternative method includes supplementing acquisition image data generated from incomplete projection data with supplemental data to expand a volume of a reconstructable field of view and employing an artifact correction to correct a correctable field of view based on the expanded reconstructable field of view.

摘要翻译： 一种方法包括基于不完全投影数据的获取投影数据和虚拟投影数据生成模拟完整投影数据，完成不完全投影数据并重构模拟完整投影数据以产生体积图像数据。 一种替代方法包括：通过补充数据补充由不完全投影数据生成的获取图像数据，以扩展可重建视场的体积，并采用伪影校正，以便基于扩展的可重构视野来校正可校正视场。

公开(公告)号：US20100310035A1

公开(公告)日：2010-12-09

申请号：US12743867

申请日：2008-11-14

申请人： Roland Proksa

发明人： Roland Proksa

IPC分类号： A61B6/03 ,  G01N23/04

CPC分类号： A61B6/032 ,  A61B6/4042 ,  A61B6/481 ,  A61B6/482

摘要： The invention relates to a medical X-ray examination apparatus (1) for performing K-edge imaging. The medical X-ray examination apparatus (1) comprises an imaging unit (21), which is configured to spectrally decompose an X-ray absorption spectrum to image the X-ray absorption spectrum as a conventional X-ray absorption image (23a) and a K-edge absorption image (23b). The conventional X-ray absorption image (23a) includes data elements representing the anatomical background of an object of interest. The K-edge absorption image (23b) includes data elements representing quantitative information of local densities of material showing K-edge absorption within the object of interest. The imaging unit (21) comprises a spatial resolution reducer for reducing the spatial resolution of the K-edge absorption image, so that with a medical X-ray examination apparatus according to the invention an increased sensitivity of the selective imaging of a K-edge absorption image is achieved as compared to the sensitivity of the selective imaging of a K-edge absorption image of a known medical X-ray examination apparatus.

摘要翻译： 本发明涉及一种用于进行K边缘成像的医用X射线检查装置（1）。 医疗用X射线检查装置（1）具备成像部（21），其被配置为对X射线吸收光谱进行光谱分解，将X射线吸收光谱图像作为常规的X射线吸收图像（23a）和 K边缘吸收图像（23b）。 传统的X射线吸收图像（23a）包括表示感兴趣对象的解剖背景的数据元素。 K边缘吸收图像（23b）包括表示在感兴趣对象内显示K边缘吸收的材料的局部密度的定量信息的数据元素。 成像单元（21）包括用于降低K边缘吸收图像的空间分辨率的空间分辨率降低器，使得利用根据本发明的医用X射线检查装置，K边缘的选择性成像的灵敏度增加 与已知医用X射线检查装置的K边缘吸收图像的选择性成像的灵敏度相比，实现了吸收图像。

公开(公告)号：US20100296624A1

公开(公告)日：2010-11-25

申请号：US12445765

申请日：2007-10-16

申请人： Claas Bontus ,  Roland Proksa ,  Thomas Koehler

发明人： Claas Bontus ,  Roland Proksa ,  Thomas Koehler

IPC分类号： A61B6/03

CPC分类号： A61B6/503 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4021 ,  A61B6/4085 ,  A61B6/541

摘要： If, in cardiac CT, the time window becomes shorter than the time required for a complete rotation of the gantry, the volume that can be reconstructed becomes small due to the non-existence of related pi-lines. According to an exemplary embodiment of the present invention, an examination apparatus is provided which generates a radiation beam oscillating in z-direction with an oscillation frequency higher than the rotational frequency of the source. This may provide for an exact image reconstruction of large volumes.

摘要翻译： 如果在心脏CT中，时间窗口变得比台架完全旋转所需的时间短，则由于不存在相关的pi线，可重构的体积变小。 根据本发明的示例性实施例，提供了一种检查装置，其产生以比源的旋转频率高的振荡频率在z方向上振荡的辐射束。 这可以提供大体积的精确图像重建。

公开(公告)号：US07826585B2

公开(公告)日：2010-11-02

申请号：US12375427

申请日：2007-07-23

申请人： Roland Proksa ,  Andy Ziegler

发明人： Roland Proksa ,  Andy Ziegler

IPC分类号： G01N23/083 ,  G01N23/087

CPC分类号： G01T1/2985 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4014 ,  G01T1/1647

摘要： A computed tomography system includes at least two x-ray sources (108), a at least one common detector (124), and a reconstruction system (136). The at least two x-ray sources (108) are aligned at different z-axis locations at about a same angular position and concurrently emit radiation that traverses an imaging region (116). The at least one detector (124) detects radiation emitted by the at least two x-ray source (108) and generates composite data indicative of the detected radiation. The reconstruction system (136) reconstructs the composite data to generate one or more images.

摘要翻译： 计算机断层摄影系统包括至少两个x射线源（108），至少一个公共检测器（124）和重建系统（136）。 所述至少两个x射线源（108）在大致相同的角位置处在不同的z轴位置对准，并同时发射穿过成像区域（116）的辐射。 所述至少一个检测器（124）检测由所述至少两个X射线源（108）发射的辐射并产生指示检测到的辐射的复合数据。 重建系统（136）重建复合数据以生成一个或多个图像。

公开(公告)号：US07778384B2

公开(公告)日：2010-08-17

申请号：US12065614

申请日：2006-09-01

申请人： Roland Proksa

发明人： Roland Proksa

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

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/4028 ,  A61B6/4291 ,  A61B6/5282

摘要： Cone-beam CT scanners with large detector arrays suffer from increased scatter radiation. This radiation may cause severe image artefacts. An examination apparatus is provided which directly measures the scatter radiation and uses this measurement for a correction of the contaminated image data. The measurement is performed by utilizing a 1-dimensional anti-scatter-grid and an X-ray tube with an electronic focal spot movement. Image data is detected at a first position of a focal spot and scatter data is detected at a second position of the focal spot. The image data is corrected on the basis of the scatter data.

摘要翻译： 具有大检测器阵列的锥束CT扫描仪遭受到增加的散射辐射。 这种辐射可能导致严重的图像伪影。 提供一种检查装置，其直接测量散射辐射并使用该测量来校正污染的图像数据。 通过利用具有电子焦斑运动的一维防散射网格和X射线管来进行测量。 在焦斑的第一位置处检测图像数据，并且在焦斑的第二位置处检测散射数据。 基于分散数据校正图像数据。

公开(公告)号：US07672423B2

公开(公告)日：2010-03-02

申请号：US12090772

申请日：2006-10-11

申请人： Roland Proksa

发明人： Roland Proksa

IPC分类号： G01N23/00

CPC分类号： A61B6/503 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4028

摘要： A short scan uses only data from about 180° gantry rotation instead of a full 360° turn. In the provided short scan cardiac CT, a periodical axial focal spot movement is performed during gantry rotation, wherein the acquired data used for image reconstruction results from a 180° rotation of the gantry. After the data acquisition, an approximate reconstruction is performed. In a preferred embodiment the focal spot moves on a short scan saddle trajectory.

摘要翻译： 短扫仅使用大约180°机架旋转的数据，而不是360°全旋转。 在所提供的短扫心脏CT中，在机架旋转期间执行周期性轴向焦点运动，其中用于图像重建的所获取的数据由机架的180°旋转导致。 数据采集​​后，进行近似重构。 在优选实施例中，焦斑在短扫描马鞍轨迹上移动。

公开(公告)号：US20100025593A1

公开(公告)日：2010-02-04

申请号：US12523998

申请日：2008-01-28

申请人： Roland Proksa

发明人： Roland Proksa

IPC分类号： G01T1/24

CPC分类号： G01T1/2928 ,  A61B6/027

摘要： Photon counting detectors may suffer from pulse sharing effects and fluorescence photon generation, which may lead to a degradation of the measured signals. According to an exemplary embodiment of the present invention, a detector unit is provided which is adapted for performing a coincidence detection and correction by comparing detection events of neighbouring cells, thereby providing for a coincidence identification followed by an individual coincidence correction. In order to reduce the number of coincidence detection and corresponding units per detector unit, a specific detector cell geometry may be applied.

摘要翻译： 光子计数检测器可能遭受脉冲共享效应和荧光光子产生，这可能导致测量信号的劣化。 根据本发明的示例性实施例，提供了一种检测器单元，其适于通过比较相邻小区的检测事件来执行一致性检测和校正，由此提供一致性识别，随后进行单独的重合校正。 为了减少符合检测的数量和每个检测器单元的相应单位，可以应用特定的检测器单元几何形状。

公开(公告)号：US20080292157A1

公开(公告)日：2008-11-27

申请号：US12090654

申请日：2006-10-06

申请人： Peter Forthmann ,  Michael Grass ,  Roland Proksa

发明人： Peter Forthmann ,  Michael Grass ,  Roland Proksa

IPC分类号： G06K9/00 ,  G06K9/40

CPC分类号： G06T11/008 ,  Y10S378/901

摘要： Since the soft tissue levels in an image usually comprise a variety of values between air and bone boundaries, it may not be obvious a priori what threshold value applies. According to an exemplary embodiment of the present invention, an examination apparatus is provided which is adapted for determining the optimal weight for subtraction of a soft tissue correction image without performing a multitude of forward and backward projections. This may be provided determining a roughness function based on a plurality of subtractions of the soft tissue streak image, each subtraction corresponding to a different weighting of the streak image.

摘要翻译： 由于图像中的软组织水平通常包含空气和骨骼边界之间的各种值，所以事先显示出什么阈值可能并不明显。 根据本发明的示例性实施例，提供一种检查装置，其适于确定用于减去软组织校正图像的最佳权重，而不执行大量向前和向后的投影。 可以提供这样来确定基于软组织条纹图像的多个减法的粗糙度函数，每个减法对应于条纹图像的不同加权。

公开(公告)号：US20080273655A1

公开(公告)日：2008-11-06

申请号：US11570896

申请日：2005-06-24

申请人： Tim Nielsen ,  Andy Ziegler ,  Thomas Koehler ,  Roland Proksa

发明人： Tim Nielsen ,  Andy Ziegler ,  Thomas Koehler ,  Roland Proksa

IPC分类号： A61B6/00 ,  G06K9/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/421 ,  Y10S378/901

摘要： The invention relates to an imaging method, especially a computerized tomography method, with which an object is penetrated by rays from different directions and measured values, which depend upon the intensity of the rays after penetrating the object, are acquired by a detector unit. From these measured values, an object image is reconstructed by means of back projection of measured-value-dependent back projection values. Therein, the object image is divided into overlapping, quasi-spherically symmetric image segments, each being defined by an image value and a quasi-spherically symmetric base function. Furthermore, during the back projection, the back projection values are added in proportions to the image values, wherein the proportion of a back projection value, which is added during the back projection to an image value, is dependent on a proportionality factor, which is equal to the average value of the line integrals of the base function belonging to the respective image value along those rays that have generated the measured value, on which the respective back projection value is dependent.

摘要翻译： 本发明涉及一种成像方法，特别是计算机断层摄影方法，其中物体被来自不同方向的光线穿透，并且测量值取决于穿透物体之后的光线的强度，由检测器单元获取。 从这些测量值，通过背投影测量值依赖的反投影值重建对象图像。 其中，对象图像被划分为重叠的准球形对称图像片段，每个片段由图像值和准球形对称的基本功能定义。 此外，在背投影期间，反投影值以与图像值成比例的方式相加，其中在后投影中添加的反投影值与图像值的比例取决于比例因子，即比例因子 等于属于相应图像值的基本功能的线积分的平均值，沿着相应的背投影值依赖于已经产生测量值的那些射线。