公开(公告)号：US20100119115A1

公开(公告)日：2010-05-13

申请号：US12518475

申请日：2007-12-10

申请人： Roland Proksa

发明人： Roland Proksa

IPC分类号： G06K9/00 ,  G01N23/04

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/5264

摘要： The invention relates to an imaging system for imaging an object (14) in an examination zone (5). The imaging system comprises a radiation source emanating radiation for illuminating the examination zone (5), a detection unit for generating detection values depending on the radiation after having passed the examination zone (5) and a moving unit for moving the 5 radiation source and the examination zone relative to each other along a first trajectory (15) and along a second trajectory (16). The position of at least one of the first trajectory (15) and of the second trajectory (16) with respect to the object is determined by a determination unit. The imaging system further comprises a reconstruction unit for reconstructing an image of the object (14) from the detection values using the determined position of the at least one of 10 the first trajectory (15) and the second trajectory (16).

摘要翻译： 本发明涉及一种用于对检查区（5）中的物体（14）进行成像的成像系统。 成像系统包括用于照射检查区（5）的辐射源发射辐射，用于在通过检查区（5）之后产生取决于辐射的检测值的检测单元和用于移动5个辐射源的移动单元和 检查区域沿着第一轨迹（15）相对于彼此并沿着第二轨迹（16）。 第一轨迹（15）和第二轨迹（16）中的至少一个相对于物体的位置由确定单元确定。 成像系统还包括重建单元，用于使用所确定的第一轨迹（15）和第二轨迹（16）中的至少一个轨迹的位置，根据检测值重建对象（14）的图像。

公开(公告)号：US20100091946A1

公开(公告)日：2010-04-15

申请号：US12596751

申请日：2008-04-17

申请人： Roland Proksa

发明人： Roland Proksa

IPC分类号： G01N23/04 ,  H05G1/60

CPC分类号： G06T11/006 ,  G06T2211/408 ,  G06T2211/424

摘要： The invention relates to an imaging system for imaging a region of interest from energy-dependent projection data, wherein the imaging system comprises a projection data providing unit (1, 2, 3, 6, 7, 8) for providing energy-dependent first projection data of the region of interest. The imaging system comprises further an attenuation component image generation unit (12) for generating attenuation component images of the region of interest by generating energy-dependent second projection data using a model in which the projection data depend on attenuation component images. The component image generation unit (12) is adapted for generating the attenuation component images such that deviations of the second projection data from the first projection data are reduced.

摘要翻译： 本发明涉及一种用于从能量相关投影数据对感兴趣区域成像的成像系统，其中成像系统包括投影数据提供单元（1,2,3,6,7,8），用于提供能量依赖的第一投影 感兴趣区域的数据。 成像系统还包括衰减分量图像生成单元（12），用于通过使用其中投影数据取决于衰减分量图像的模型来生成依赖于能量的第二投影数据来产生感兴趣区域的衰减分量图像。 分量图像生成单元（12）适于生成衰减分量图像，使得第二投影数据与第一投影数据的偏差减小。

公开(公告)号：US20100061504A1

公开(公告)日：2010-03-11

申请号：US12517254

申请日：2007-11-29

申请人： Roland Proksa

发明人： Roland Proksa

IPC分类号： H05G1/60 ,  G01N23/04

CPC分类号： A61B6/504 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/481 ,  A61B6/482 ,  A61B6/507 ,  Y10S378/901

摘要： The invention relates to a CT imaging system for determining the flow of a substance within an object, wherein the CT imaging system comprises a polychromatic X-ray source and an energy-resolving X-ray detector for obtaining detection signals depending on the X-ray radiation after passing through the object. A calculation unit (12) determines a k-edge 5 component of the substance from the detection signals, and a reconstruction unit (13) reconstructs a time series of k-edge image from the determined k-edge component. A flow determination unit (14) determines flow values indicative for the flow within the object from the time series of k-edge images.

摘要翻译： 本发明涉及一种用于确定物体内物质流动的CT成像系统，其中CT成像系统包括多色X射线源和能量分辨X射线检测器，用于根据X射线获得检测信号 穿过物体后的辐射。 计算单元（12）根据检测信号确定物质的k边缘5分量，重建单元（13）根据确定的k边缘分量重构k边缘图像的时间序列。 流量确定单元（14）根据k边缘图像的时间序列确定指示对象内的流动的流量值。

公开(公告)号：US07672490B2

公开(公告)日：2010-03-02

申请号：US10597871

申请日：2005-02-04

申请人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

发明人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

IPC分类号： G06K9/00 ,  A61B6/00 ,  A61B5/05

CPC分类号： G06T11/005 ,  A61B6/027 ,  G06T2211/412

摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.

摘要翻译： 运动是螺旋锥束CT中最重要的文物来源之一。 通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。 运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。 有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。

公开(公告)号：US07426257B2

公开(公告)日：2008-09-16

申请号：US10552399

申请日：2004-04-02

申请人： Thomas Köhler ,  Michael Grass ,  Roland Proksa

发明人： Thomas Köhler ,  Michael Grass ,  Roland Proksa

IPC分类号： A61B6/03

CPC分类号： A61B6/541 ,  A61B5/1135 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  A61B6/503 ,  A61B6/504

摘要： The invention relates to a computer tomography method in which a periodically moving object, in particular an organ of the body, is irradiated by a cone-shaped beam cluster (4) along a trajectory which runs on a cylindrical surface. The radiation transmitted through the object is measured by means of a detector unit (16), and at the same time the periodic movement of the object is recorded. In order to reconstruct the absorption distribution of the object, the measured values or the corresponding beams are rebinned to form a number of parallel projections, where for each of these projections a measured value is determined whose beam irradiates the object. The point in time at which this measured value was acquired is allocated to the respective projection. For the reconstruction, which may for example be carried out using a filtered back-projection, only projections whose allocated points in time lie within a predefined, specific time range (H1) within a period of the object movement are used.

摘要翻译： 本发明涉及一种计算机断层摄影方法，其中周期性移动的物体，特别是身体的脏器被沿着在圆柱形表面上运行的轨迹由锥形束簇（4）照射。 通过检测器单元（16）测量透过物体的辐射，同时记录物体的周期性运动。 为了重建物体的吸收分布，将测量值或对应的光束重新组合以形成多个平行投影，其中对于这些投影中的每一个，确定其光束照射物体的测量值。 将获取该测量值的时间点分配给相应的投影。 对于可以例如使用滤波反投影来进行的重建，仅使用其分配的时间点在物体移动的时段内在预定义的特定时间范围（H 1）内的投影。

公开(公告)号：US20080205585A1

公开(公告)日：2008-08-28

申请号：US11912689

申请日：2006-04-25

申请人： Roland Proksa ,  Michael Grass

发明人： Roland Proksa ,  Michael Grass

IPC分类号： A61B6/00

CPC分类号： G01T1/2985 ,  G01N23/046 ,  G01N2223/419 ,  G01V5/0041 ,  G01V5/005

摘要： Spectral CT systems require cheap detectors with high energy resolution. According to an aspect of the present invention, a computer tomography apparatus comprises a detector element which is segmented into a plurality of sub-pixels. Each sub-pixel has at least two thresholds and counting channels, wherein the second threshold for each sub-pixel varies over the nominal detector element. This may provide for an improved energy-resolved photon counting.

摘要翻译： 光谱CT系统需要具有高能量分辨率的廉价检测器。 根据本发明的一个方面，计算机断层摄影装置包括被分割成多个子像素的检测器元件。 每个子像素具有至少两个阈值和计数通道，其中每个子像素的第二阈值在标称检测器元件上变化。 这可以提供改进的能量分辨光子计数。

公开(公告)号：US07292717B2

公开(公告)日：2007-11-06

申请号：US10560454

申请日：2004-06-07

申请人： Thomas Köhler ,  Roland Proksa

发明人： Thomas Köhler ,  Roland Proksa

IPC分类号： G06K9/00

CPC分类号： G06T11/006 ,  A61B6/027 ,  G06T2211/416

摘要： The invention relates to a computer tomography method in which a radiation source moves relative to an examination region along, in particular, a helical or circular trajectory. Measured values are acquired by a detector unit and a CT image of the examination region is reconstructed from these measured values. In the reconstruction, a complementary measured value, whose ray is oriented parallel to the ray of the respective measured value that has been acquired but in the opposite direction thereto, is determined for each of at least some measured values that lie within a reconstruction window. Redundant measured values are used to calculate the complementary measured values, with the help in particular of John's equation. The measured values for which complementary measured values have been determined are each replaced by a sum comprised a measured value that has been weighted and a complementary measured value that has been weighted, and a CT image is reconstructed, in particular by an exact method of reconstruction, from the replacement measured values, and where appropriate from acquired measured values, that lie within the reconstruction window.

摘要翻译： 本发明涉及一种计算机断层摄影方法，其中辐射源相对于沿着特别是螺旋或圆形轨迹的检查区域移动。 通过检测器单元获取测量值，并从这些测量值重建检查区域的CT图像。 在重建中，对于位于重建窗口内的至少一些测量值中的每一个确定其光线平行于已经获取但与其相反方向的相应测量值的射线的互补测量值。 冗余测量值用于计算补充测量值，特别是约翰方程式的帮助。 已经确定了互补测量值的测量值各自被包括被加权的测量值和已经加权的测量值和重建CT图像的和，特别是通过重建的精确方法 ，从替换测量值，并在适当时从获得的测量值，位于重建窗口内。

公开(公告)号：US20070177713A1

公开(公告)日：2007-08-02

申请号：US10597871

申请日：2005-02-04

申请人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

发明人： Thomas Kohler ,  Roland Proksa ,  Claas Bontus

IPC分类号： H05G1/60 ,  G06K9/00 ,  G01N23/00 ,  G21K1/12

CPC分类号： G06T11/005 ,  A61B6/027 ,  G06T2211/412

摘要： Motion is one of the most critical sources of artifacts in helical conebeam CT. By comparing opposite rays corresponding to projection data, the amount of motion may be estimated and, in the following suppression of corresponding motion artifacts may be performed according to an exemplary embodiment of the present invention. The method of motion artifact compensation may be implemented in both approximate reconstruction algorithms and exact reconstruction algorithms. Advantageously, motion during the data acquisition is detected automatically and related motion artifacts may be suppressed adaptively.

摘要翻译： 运动是螺旋锥束CT中最重要的文物来源之一。 通过比较与投影数据相对应的相对射线，可以估计运动量，并且可以根据本发明的示例性实施例来执行以下对相应运动伪像的抑制。 运动伪像补偿的方法可以在近似重建算法和精确重构算法中实现。 有利地，自动检测数据采集期间的运动，并且可以自适应地抑制相关的运动伪像。

公开(公告)号：US06490477B1

公开(公告)日：2002-12-03

申请号：US09303317

申请日：1999-04-30

申请人： Waldemar Zylka ,  Roland Proksa ,  Willem P. Van Der Brug

发明人： Waldemar Zylka ,  Roland Proksa ,  Willem P. Van Der Brug

IPC分类号： A61B505

CPC分类号： A61B6/583 ,  A61B6/04 ,  A61B6/08 ,  A61B6/547 ,  G05B2219/39029

摘要： An imaging modality, in particular a mobile CT system, comprises an imaging system for imaging an object to be examined. The imaging modality is also provided with an image guided surgery system which includes a position measuring system for measuring positions within the object and a data processor for deriving a transformation between positions within the object and the corresponding positions in the image. The position measuring device is also arranged to measure the position of the imaging system and the data processor is arranged to derive the transformation from the position and/or orientation of the imaging system. The position measuring system is notably an optical position measuring system which is arranged to measure the position of the gantry of the CT system. The data processor is arranged to derive the transformation from the measured position of the gantry. A highly accurate result is obtained when a calibration is carried out which links the position of the CT gantry to the position of the scanning plane.

摘要翻译： 成像模态，特别是移动CT系统，包括用于对被检查对象进行成像的成像系统。 成像模式还提供有图像引导手术系统，其包括用于测量对象内的位置的位置测量系统和用于导出对象内的位置与图像中的对应位置之间的变换的数据处理器。 位置测量装置还被布置成测量成像系统的位置，并且数据处理器被布置成从成像系统的位置和/或取向导出变换。 位置测量系统特别是一种光学位置测量系统，其被布置成测量CT系统的台架的位置。 数据处理器被安排为从台架的测量位置导出变换。 当执行将CT机架的位置与扫描平面的位置联系起来的校准时，获得高度精确的结果。

公开(公告)号：US06426992B1

公开(公告)日：2002-07-30

申请号：US09921505

申请日：2001-08-02

申请人： Thomas Köhler ,  Roland Proksa

发明人： Thomas Köhler ,  Roland Proksa

IPC分类号： A61B603

CPC分类号： G01T1/2985 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4085 ,  A61B6/4291 ,  A61B6/482 ,  Y10S378/901

摘要： The invention relates to a computed tomography apparatus whose radiation source emits a conical radiation beam and is capable of scanning the examination zone along a trajectory in the form of a helix. The detector unit that is connected to the radiation source consists of a plurality of spatially separated detector segments that are mutually offset in the axial direction and each of which is arranged in such a manner that a projection onto the helix covers at least two neighboring turns of the helix. A CT image having an improved and spatially more uniformly distributed signal-to-noise ratio can be reconstructed from the CT data acquired by means of such a detector unit.