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1. 发明申请

WO2007072279A1 ITERATIVE IMAGE RECONSTRUCTION OF A MOVING OBJECT FROM PROJECTION DATA 审中-公开
标题翻译：投影数据移动对象的迭代图像重构
公开(公告)号：WO2007072279A1
公开(公告)日：2007-06-28
申请号：PCT/IB2006/054700
申请日：2006-12-08
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , NIELSEN, Tim , GRASS, Michael , ZIEGLER, Andy
发明人： NIELSEN, Tim , GRASS, Michael , ZIEGLER, Andy
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , G06T2211/412 , G06T2211/424
摘要： Iterative methods for reconstructing an image sequence of a moving object based on projection data usually require a high computationally effort. According to embodiments of the present invention there is provided such a method wherein a first image representing the object at a first phase is used as an initial image for iteratively reconstructing a second image at a second phase. A first gating function is assigned to the first phase, a second gating function is assigned to the second phase. When executing a first iteration for reconstructing the second image only projection data corresponding to a non- overlapping part of the two gating functions are used. For executing further iterations the amount of projection data corresponding to the overlapping part of the two gating functions may be gradually increased. Therefore, for all further but the last iteration the computationally effort is significantly reduced. However, this low computationally expense has no negative impact on the quality of the finally reconstructed second image because the method benefits from the fact that the first image was used as the initial image for iteratively reconstructing the second image.
摘要翻译：基于投影数据重建移动物体的图像序列的迭代方法通常需要较高的计算量。根据本发明的实施例，提供了这样的方法，其中将表示第一阶段的对象的第一图像用作用于在第二阶段迭代重建第二图像的初始图像。第一门控功能被分配给第一阶段，第二门控功能被分配给第二阶段。当执行用于重建第二图像的第一迭代时，仅使用与两个门控功能的非重叠部分相对应的投影数据。为了执行进一步的迭代，对应于两个门控功能的重叠部分的投影数据的量可以逐渐增加。因此，对于所有进一步但最后的迭代，计算量的努力显着降低。然而，这种低的计算费用对最终重建的第二图像的质量没有负面影响，因为该方法受益于第一图像被用作用于迭代重建第二图像的初始图像的事实。

2. 发明申请

WO2007031899A2 EFFICIENT ITERATIVE FOUR-DIMENSIONAL CARDIAC CONE-BEAM CT RECONSTRUCTION 审中-公开
标题翻译：高效的四维心脏重建CT重建
公开(公告)号：WO2007031899A2
公开(公告)日：2007-03-22
申请号：PCT/IB2006/053055
申请日：2006-09-01
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , GRASS, Michael , ZIEGLER, Andy , NIELSEN, Tim
发明人： GRASS, Michael , ZIEGLER, Andy , NIELSEN, Tim
CPC分类号： A61B6/032 , A61B6/027 , A61B6/541 , G06T11/006 , G06T2211/412 , G06T2211/424
摘要： The increasing cone angle of current high-end and future CT systems leads to a decrease in image quality if approximate cone-beam reconstruction methods are used. According to an exemplary embodiment of the present invention, an iterative four-dimensional cardiac CT reconstruction is provided, in which phase volumes are selected from the four-dimensional data set, each having the same spatial volume at different phase points. Corresponding voxels inside these phase volumes are then forward projected onto the same projection. After calculation of a different projection, these voxels are updated. This may provide for an efficient implementation of an iterative four-dimensional cardiac cone-beam CT reconstruction.
摘要翻译：目前的高端和未来CT系统的锥角越来越大，如果使用近似锥束重建方法，则会导致图像质量下降。根据本发明的示例性实施例，提供了一种迭代的四维心脏CT重建，其中从四维数据集中选择相位体积，每个四维数据集在不同相位处具有相同的空间体积。然后将这些相位体积内的相应体素向前投影到相同的投影上。在计算了不同的投影之后，这些体素被更新。这可以提供迭代四维心脏锥束CT重建的有效实施。

3. 发明申请

WO2006067671A2 METHOD FOR COMPUTER TOMOGRAPHY, AND COMPUTER TOMOGRAPH 审中-公开
标题翻译：计算机图形学和计算机图形学的方法
公开(公告)号：WO2006067671A2
公开(公告)日：2006-06-29
申请号：PCT/IB2005/054198
申请日：2005-12-13
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , FORTHMANN, Peter , KÖHLER, Thomas , MANZKE, Robert , GRASS, Michael , ZIEGLER, Andy
发明人： FORTHMANN, Peter , KÖHLER, Thomas , MANZKE, Robert , GRASS, Michael , ZIEGLER, Andy
IPC分类号： A61B6/00 , A61B6/03
CPC分类号： A61B6/541 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/503
摘要： According to the invention, there is provided a method of recording images of the heart in computer tomography, in which, in order to prevent movement artifacts, the images are reconstructed on the basis of similar movement states of the heart and different radiation intensities are used for different movement states. Also provided is a computer tomograph for recording images of the heart in computer tomography by means of time windows which exhibit similar movement states of the heart in order to prevent movement artifacts, said computer tomograph comprising a control device which controls a radiation source with different radiation intensities for different movement states. Furthermore provided is a computer program for a computer tomograph for recording images of the heart in computer tomography by means of time windows which exhibit similar movement states of the heart in order to prevent movement artifacts, and for controlling a radiation source with different radiation intensities for different movement states.
摘要翻译：根据本发明，提供了一种在计算机断层摄影中记录心脏图像的方法，其中为了防止运动伪像，基于心脏的相似运动状态重建图像，并且使用不同的辐射强度对于不同的运动状态。还提供了一种用于在计算机断层摄影中记录心脏图像的计算机断层摄影装置，其通过显示相似的心脏运动状态以防止运动伪像的时间窗口，所述计算机断层摄影机包括控制具有不同辐射的辐射源的控制装置不同运动状态的强度。此外还提供了一种用于计算机断层摄影机的计算机程序，用于通过时间窗口在计算机断层摄影中记录心脏的图像，所述时间窗口表现出相似的心脏移动状态以防止运动伪像，并且用于控制具有不同辐射强度的辐射源不同的运动状态。

4. 发明申请

WO2006038145A1 COMPUTED TOMOGRAPHY METHOD 审中-公开
标题翻译：计算机测图法
公开(公告)号：WO2006038145A1
公开(公告)日：2006-04-13
申请号：PCT/IB2005/053154
申请日：2005-09-23
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , KOKEN, Peter , ZIEGLER, Andy , GRASS, Michael , KÖHLER, Thomas , PROKSA, Roland
发明人： KOKEN, Peter , ZIEGLER, Andy , GRASS, Michael , KÖHLER, Thomas , PROKSA, Roland
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4028 , A61B6/4085 , A61B6/4291
摘要： A computed tomography method and apparatus are provided wherein a radiation source moves circularly relative to an examination zone about an axis of rotation (14). The radiation source produces a cone beam of x-rays and the focal point of this cone beam is switched between at least two positions (23a, 23b) sapced apart from each other and arranged on a line parallel to the axis of rotation to enlarge the reconstructable examination zone parallel to the axis of rotation. Preferably, the image of the examination zone is reconstructed using an iterative reconstruction method, in particular an algebraic reconstruction method or a maximum likelihood method.
摘要翻译：提供了一种计算机断层摄影方法和装置，其中辐射源围绕旋转轴线（14）相对于检查区域循环移动。辐射源产生X射线的锥形束，并且该锥形束的焦点在至少两个彼此分离的位置（23a，23b）之间切换并且布置在平行于旋转轴线的直线上，以扩大可重建检查区域平行于旋转轴。优选地，使用迭代重建方法，特别是代数重建方法或最大似然方法来重建检查区域的图像。

5. 发明申请

WO2007069121A1 ADVANCED CONVERGENCE FOR MULTIPLE ITERATIVE ALGORITHM 审中-公开
标题翻译：多元迭代算法的高级收敛
公开(公告)号：WO2007069121A1
公开(公告)日：2007-06-21
申请号：PCT/IB2006/054577
申请日：2006-12-04
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , ZIEGLER, Andy , GRASS, Michael
发明人： ZIEGLER, Andy , GRASS, Michael
IPC分类号： G06T1/60
CPC分类号： G06T11/005 , G06T2211/424
摘要： Iterative methods for reconstructing of three-dimensional images based on projection data signals obtained by a computer tomography system often result in wrong absorption coefficients in particular for regions including a hollow space of an object under examination. Furthermore iterative methods show a slow convergence for calculating such absorption coefficients. According to embodiments of the present invention there is provided a method for an advanced reconstruction of three- dimensional images based on modified projection data signals. The modification includes an addition of a constant absorption value to the measured projection data. Advantageously the constant absorption value is an absorption line integral through a virtual body having the spatial constant absorption coefficient of water. The virtual body preferably has a volume which is slightly bigger than the object of interest.
摘要翻译：基于由计算机断层摄影系统获得的投影数据信号重建三维图像的迭代方法通常导致错误的吸收系数，特别是对于包括被检查物体的中空空间的区域。此外，迭代方法显示计算这种吸收系数的缓慢收敛。根据本发明的实施例，提供了一种基于经修改的投影数据信号对三维图像进行高级重建的方法。修改包括对所测量的投影数据添加恒定的吸收值。有利地，恒定吸收值是通过具有水的空间常数吸收系数的虚拟体积分的吸收线。虚拟体优选地具有比感兴趣对象略大的体积。

6. 发明申请

WO2005088544A1 ARTIFACT CORRECTION 审中-公开
标题翻译：文学校正
公开(公告)号：WO2005088544A1
公开(公告)日：2005-09-22
申请号：PCT/IB2005/050848
申请日：2005-03-08
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , ZIEGLER, Andy
发明人： ZIEGLER, Andy
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , A61B6/5258 , G06T2211/424
摘要： The reconstruction of images of an object of interest may introduce artifacts along lines of high gradients of absorption values. According to an exemplary embodiment of the present invention, these artifacts may efficiently be removed by a statistical weighing during reconstruction of the image. Advantageously, according to an aspect of the present invention, the reconstruction of the image may be performed iteratively, wherein the updates are weighted with the intrinsic statistical error of the measured photon counts. This may lead to an efficient removal of artifacts.
摘要翻译：感兴趣对象的图像的重建可以沿着吸收值的高梯度线引入人为因素。根据本发明的示例性实施例，通过在重建图像期间的统计称重可以有效地去除这些伪影。有利地，根据本发明的一个方面，可以迭代地执行图像的重构，其中使用所测量的光子计数的固有统计误差对更新进行加权。这可能导致有效地去除伪影。

7. 发明申请

WO2006109233A3 IMAGE PROCESSING SYSTEM, PARTICULARLY FOR CIRCULAR AND HELICAL CONE-BEAM CT 审中-公开
公开(公告)号：WO2006109233A3
公开(公告)日：2006-10-19
申请号：PCT/IB2006/051086
申请日：2006-04-10
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , KÖHLER, Thomas , PROKSA, Roland , ZIEGLER, Andy
发明人： KÖHLER, Thomas , PROKSA, Roland , ZIEGLER, Andy
IPC分类号： G06T11/00
摘要： The invention relates to an examination apparatus with an X-ray device (10) for circular or helical cone-beam CT acquisition of projections images (P i (E 1 ), P i (E 2 )) of a patient (1) with different energy spectra (E 1 , E 2 ) and/or with an energy -resolved detection. By a combination of the projections, images (I bone , i , I tissue , i ) can be calculated that show predominantly the bone structure and the soft tissue, respectively. Therefore, a 3D model (M bone ) of the bone structure and a 3D model (M tissue ) of the tissue can be reconstructed separately. After removal of artifacts from the bone- structure model (M bone ), both separate 3D models can be integrated to a combined model (M) of the body volume with a high image quality.

8. 发明申请

WO2006097867A2 METHOD AND DEVICE FOR THE ITERATIVE RECONSTRUCTION OF TOMOGRAPHIC IMAGES 审中-公开
标题翻译：用于重建图像图像的方法和装置
公开(公告)号：WO2006097867A2
公开(公告)日：2006-09-21
申请号：PCT/IB2006/050699
申请日：2006-03-07
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , ZIEGLER, Andy , KÖHLER, Thomas , PROKSA, Roland
发明人： ZIEGLER, Andy , KÖHLER, Thomas , PROKSA, Roland
IPC分类号： G06T11/00
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 μ j in a tomographic image of an object (1) from projection measurements m i . In the update equation for μ j n during the n-th iteration the backprojected error (m i -m i -(µ j n )) 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射测量m 1 i中的对象（1）的断层图像中迭代重建衰减系数μΣj的装置和方法。在μ ^{的更新方程式中}

9. 发明申请

WO2007119124A1 CONE BEAM COMPUTED TOMOGRAPHY WITH MULTIPLE PARTIAL SCANNING TRAJECTORIES 审中-公开
标题翻译：具有多个部分扫描轨迹的锥体光束计算机图
公开(公告)号：WO2007119124A1
公开(公告)日：2007-10-25
申请号：PCT/IB2006/050497
申请日：2006-04-19
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , BONTUS, Claas , KOEHLER, Thomas , KOKEN, Peter , ZIEGLER, Andy
发明人： BONTUS, Claas , KOEHLER, Thomas , KOKEN, Peter , ZIEGLER, Andy
IPC分类号： A61B6/03 , G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , G06T11/005
摘要： A computer tomography apparatus (100) for examination of an object of interest (107) comprising an electromagnetic radiation source (104) adapted to emit electromagnetic radiation to an object of interest (107), a detecting device (108) adapted to detect electromagnetic radiation generated by the electromagnetic radiation source (104) and passed through the object of interest (107), and a motion generation device (101, 119) adapted to move the electromagnetic radiation source (104) and the detecting device (108) with respect to the object of interest (107) along a first trajectory and along a second trajectory which differs from the first trajectory, wherein the second trajectory is selected in such a manner that electromagnetic radiation detected during performing the second trajectory provides data which complete mathematically incomplete data detected during performing the first trajectory to thereby allow a reconstruction of structural information concerning the object of interest (107).
摘要翻译：一种用于检查感兴趣对象（107）的计算机断层摄影装置（100），包括适于向感兴趣对象（107）发射电磁辐射的电磁辐射源（104），适于检测电磁辐射的检测装置由电磁辐射源（104）产生并通过感兴趣物体（107）的运动产生装置（101,119），适于相对于电磁辐射源（104）移动电磁辐射源（104）和检测装置感兴趣的物体（107）沿着第一轨迹并且沿着与第一轨迹不同的第二轨迹，其中以这样的方式选择第二轨迹，使得在执行第二轨迹期间检测到的电磁辐射提供了完全数学上不完整的数据检测的数据在执行第一轨迹期间，从而允许重建关于感兴趣对象的结构信息（107）。

10. 发明申请

WO2006109227A2 ENERGY DISTRIBUTION RECONSTRUCTION IN CT 审中-公开
标题翻译： CT中的能量分配重建
公开(公告)号：WO2006109227A2
公开(公告)日：2006-10-19
申请号：PCT/IB2006/051068
申请日：2006-04-07
申请人： PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KONINKLIJKE PHILIPS ELECTRONICS N. V. , ZIEGLER, Andy
发明人： ZIEGLER, Andy
IPC分类号： G01V5/00 , G01T1/29 , G01T1/164
CPC分类号： G01T1/2985
摘要： The reconstruction of the energy distribution at a detector with a detector element that consists of many small pixels, which count the number of photons above certain thresholds, is performed with a Maximum Likelihood analysis, according to an aspect of the present invention. Thus, the reconstruction scheme may use the redundancy in the measurement and may treat the Poisson statistics accordingly.
摘要翻译：根据本发明的一个方面，利用具有最大似然分析的多个小像素组成的检测器元件的检测器重建能量分布，所述小像素计数高于特定阈值的光子数量。因此，重建方案可以使用测量中的冗余度，并且可以相应地对待泊松统计。

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