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公开(公告)号：WO2008026153A3
公开(公告)日：2008-07-17
申请号：PCT/IB2007053442
申请日：2007-08-28
Applicant: KONINKL PHILIPS ELECTRONICS NV , PHILIPS INTELLECTUAL PROPERTY , BONTUS CLAAS , GRASS MICHAEL , KOEHLER THOMAS
Inventor： BONTUS CLAAS , GRASS MICHAEL , KOEHLER THOMAS
IPC: A61B6/03
Abstract: The present invention relates to an imaging system for imaging a field of interest, in particular to a computed tomography system. The imaging system comprises an irradiation unit (2) which moves relative to a field of interest along a first trajectory (501) and along a second trajectory (503). While the irradiation unit (2) moves along the first trajectory (501), first detection data are acquired and, while the irradiation unit (2) moves along the second trajectory (503), second detection data are acquired. An intermediate image of the field of interest is reconstructed from at least the second detection data, and virtual detection data are determined by forward projection through the intermediate image. Finally, an image of the field of interest is reconstructed from the first detection data and the virtual detection data.
Abstract translation: 本发明涉及一种用于对感兴趣的区域成像的成像系统，具体涉及一种计算机断层摄影系统。 该成像系统包括照射单元（2），其沿着第一轨迹（501）并且沿着第二轨迹（503）相对于感兴趣的区域移动。 在照射单元（2）沿着第一轨道（501）移动期间，获取第一检测数据，并且在照射单元（2）沿着第二轨迹（503）移动的同时获取第二检测数据。 至少从第二检测数据重构感兴趣区域的中间图像，并且通过经由中间图像的前向投影来确定虚拟检测数据。 最后，根据第一检测数据和虚拟检测数据重建感兴趣区域的图像。
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公开(公告)号：WO2007072286A3
公开(公告)日：2007-10-18
申请号：PCT/IB2006054727
申请日：2006-12-11
Applicant: PHILIPS INTELLECTUAL PROPERTY , KONINKL PHILIPS ELECTRONICS NV , GRASS MICHAEL , KOEHLER THOMAS
Inventor： GRASS MICHAEL , KOEHLER THOMAS
IPC: G06T11/00
CPC classification number: A61B6/032 , A61B6/541 , G06T11/005 , G06T2211/412
Abstract: According to an exemplary embodiment a method for movement compensation of image data of an object of interest comprises receiving projection data, receiving motion vector field data, and dividing the motion vector field data into a number of layers of motion vector field data. Furthermore, the method comprises generating motion compensated projection data by projecting at least one of the number of layered motion vector field data onto the projection data and applying a two dimensional motion compensation on the projection, and generating image data of at least one voxel by back-projecting the movement compensated projection data.
Abstract translation: 根据示例性实施例，感兴趣对象的图像数据的移动补偿的方法包括接收投影数据，接收运动矢量场数据，以及将运动矢量场数据分成多个运动矢量场数据层。 此外，该方法包括通过将多个分层运动矢量场数据中的至少一个投影到投影数据上并在投影上应用二维运动补偿来生成运动补偿投影数据，并且通过返回生成至少一个体素的图像数据 - 投影运动补偿投影数据。
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公开(公告)号：WO2006000997A3
公开(公告)日：2007-04-26
申请号：PCT/IB2005052090
申请日：2005-06-24
Applicant: PHILIPS INTELLECTUAL PROPERTY , KONINKL PHILIPS ELECTRONICS NV , NIELSEN TIM , ZIEGLER ANDY , KOEHLER THOMAS , PROKSA ROLAND
Inventor： NIELSEN TIM , ZIEGLER ANDY , KOEHLER THOMAS , PROKSA ROLAND
IPC: G06T11/00
CPC classification number: G06T11/006 , A61B6/027 , G06T2211/421 , Y10S378/901
Abstract: 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.
Abstract translation: 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。
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公开(公告)号：DE602004026460D1
公开(公告)日：2010-05-20
申请号：DE602004026460
申请日：2004-10-04
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： NIELSEN TIM , KOEHLER THOMAS
IPC: G06T11/00
Abstract: Iterative algorithms, which may be used for image reconstruction, include alternating projections and backprojections usually have a slow convergence, due to correlations between simultaneously processed data. Consequently, a low image quality results. A filtering step is introduced before backprojection, allowing parallel processing without the loss of convergence speed or image quality. Advantageously, this allows several projections/backprojections to be performed simultaneously.
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公开(公告)号：DE602005004413D1
公开(公告)日：2008-03-06
申请号：DE602005004413
申请日：2005-07-04
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： FORTHMANN PETER , KOEHLER THOMAS
IPC: G06T11/00
Abstract: The invention relates to a method of computed tomography wherein a radiation source moves relative to an examination zone along a helical trajectory and wherein the movement involves a rotation around a rotational axis and a shifting parallel to the rotational axis. During the movement, a detector unit acquires real measured values. Fictitious measured values are determined from the real measured values by solving John's equation for a virtual movement of the radiation source along an intersection ellipse. The intersection ellipse intersects the helical trajectory at an intersection point and is the intersection of a virtual cylindrical surface, on which the helical trajectory is situated, with an intersection plane that is defined by a tangent vector of the helical trajectory at the intersection point and a vector that is oriented perpendicular to the rotational axis. Finally, an image of the examination zone is reconstructed using the real and fictitious measured values.
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Patent Agency Ranking
公开(公告)号：DE60306417T2
公开(公告)日：2007-02-01
申请号：DE60306417
申请日：2003-11-03
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： BONTUS CLAAS , KOEHLER THOMAS
IPC: G06T11/00
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公开(公告)号：DE60306417D1
公开(公告)日：2006-08-03
申请号：DE60306417
申请日：2003-11-03
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： BONTUS CLAAS , KOEHLER THOMAS
IPC: G06T11/00
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公开(公告)号：DE50109118D1
公开(公告)日：2006-05-04
申请号：DE50109118
申请日：2001-04-26
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： GRASS MICHAEL , KOEHLER THOMAS , PROKSA ROLAND
Abstract: The invention relates to a computed tomography method which involves a conical radiation beam which irradiates the examination zone along at least two trajectories that are offset relative to one another in the direction of the axis of rotation, the distance between the trajectories being chosen to be so large that voxels in an intermediate region are not completely irradiated neither in one trajectory nor in the other trajectory. The absorption distribution in this intermediate region can be reconstructed without loss of image quality when measuring data from both trajectories are combined.
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公开(公告)号：DE10204926A1
公开(公告)日：2003-08-21
申请号：DE10204926
申请日：2002-02-07
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： GRAS MICHAEL , KOEHLER THOMAS
Abstract: The invention relates to a computed tomography method in which an examination zone is irradiated from two mutually offset, preferably circular trajectories. In an intermediate region the absorption distribution is reconstructed by means of measuring values from both trajectories, the weight with which the measuring values are used being larger as the distance between the voxel to be reconstructed and the relevant trajectory is smaller.
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公开(公告)号：DE602005026567D1
公开(公告)日：2011-04-07
申请号：DE602005026567
申请日：2005-12-08
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： GRASS MICHAEL , KOEHLER THOMAS
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