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1. 发明申请

WO2012073167A1 ITERATIVE RECONSTRUCTION ALGORITHM WITH A CONSTANT VARIANCE BASED WEIGHTING FACTOR 审中-公开
标题翻译：基于恒定变量因子的迭代重构算法
公开(公告)号：WO2012073167A1
公开(公告)日：2012-06-07
申请号：PCT/IB2011/055307
申请日：2011-11-25
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , BRENDEL, Bernhard Johannes , KOEHLER, Thomas , SCHMITT, Holger , BIPPUS, Rolf Dieter , PROKSA, Roland
发明人： BRENDEL, Bernhard Johannes , KOEHLER, Thomas , SCHMITT, Holger , BIPPUS, Rolf Dieter , PROKSA, Roland
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/424
摘要： A method includes reconstructing measured projection data using an iterative statistical reconstruction algorithm that reduces image artifact caused by differences in variances in projections of the measured projection data used to update a voxel of the image for one or more voxels of the image. A reconstructor includes a processor that reconstructs measured projection data using an iterative statistical reconstruction algorithm that reduces or mitigates image artifact caused by differences in variances in projections used to update a voxel of the image for one or more voxels of the image. A computer readable storage medium encoded with computer executable instructions, which, when executed by a processor of a computer, cause the processor to: reduce image artifact caused by differences in variances in projections used to update a voxel of an image for one or more voxels of the image using an iterative statistical reconstruction algorithm.
摘要翻译：一种方法包括使用迭代统计重建算法来重建测量的投影数据，所述迭代统计重构算法减少由用于更新图像的一个或多个体素的图像的体素的测量投影数据的投影方差的差异引起的图像伪像。重构器包括使用迭代统计重构算法来重建测量的投影数据的处理器，其减少或减轻由用于更新图像的一个或多个体素的图像的体素的投影方差的差异引起的图像伪像。一种用计算机可执行指令编码的计算机可读存储介质，其在由计算机的处理器执行时使处理器能够：减少由用于更新一个或多个体素的图像的体素的投影方差的差异引起的图像伪像的图像使用迭代统计重建算法。

2. 发明申请

WO2012069964A1 FORWARD PROJECTION APPARATUS 审中-公开
标题翻译：前进投影装置
公开(公告)号：WO2012069964A1
公开(公告)日：2012-05-31
申请号：PCT/IB2011/055123
申请日：2011-11-16
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KOEHLER, Thomas , BRENDEL, Bernhard, Johannes , SCHMITT, Holger , BIPPUS, Rolf Dieter
发明人： KOEHLER, Thomas , BRENDEL, Bernhard, Johannes , SCHMITT, Holger , BIPPUS, Rolf Dieter
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , G06T11/008 , G06T2211/424
摘要： The invention relates to a forward projection apparatus for performing a forward projection through an image (22), wherein at least one of a number of rays (20, 21) for performining the forward projection, a ray spacing between the rays and a kernel width of an interpolation kernel for calculating interpolated values located on the rays is varied depending on the ray width relative to an effective image element spacing between image elements (24) of the image. This allows reducing artifacts in simulated projection data and, thus, in an image, which is iteratively reconstructed by using the simulated projection data. For example, if the number of provided rays and/or the ray spacing between the provided rays is varied, aliasing artifacts can be reduced. Moreover, if the ray spacing between the provided rays and/or the kernel width of the interpolation kernel is varied, artifacts caused by varying effective kernel widths may be reduced.
摘要翻译：本发明涉及一种用于通过图像（22）执行向前投影的前投投影装置，其中，用于执行向前投影的多个光线（20,21）中的至少一个，光线之间的光线间隔和核宽度用于计算位于光线上的内插值的插值内核根据相对于图像的图像元素（24）之间的有效图像元素间隔的光线宽度而变化。这允许减少模拟投影数据中的伪影，并因此减少通过使用模拟投影数据迭代重建的图像。例如，如果提供的光线的数量和/或所提供的光线之间的光线间隔变化，则可以减少混叠伪影。此外，如果所提供的光线之间的光线间距和/或内插核的内核宽度发生变化，则可能会降低由变化的有效内核宽度引起的伪影。

3. 发明申请

WO2012080971A1 IMAGING SYSTEM FOR IMAGING A REGION OF INTEREST 审中-公开
标题翻译：用于成像区域的成像系统
公开(公告)号：WO2012080971A1
公开(公告)日：2012-06-21
申请号：PCT/IB2011/055689
申请日：2011-12-15
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , PROKSA, Roland , BRENDEL, Bernhard Johannes , KOEHLER, Dr. Thomas
发明人： PROKSA, Roland , BRENDEL, Bernhard Johannes , KOEHLER, Dr. Thomas
IPC分类号： G06T11/00
CPC分类号： G06T11/003 , G06T11/006 , G06T2211/408 , G06T2211/424
摘要： The noise of a detection value acquired by an imaging system (30) can depend on the contributions of different components within a region of interest to be imaged, which has been traversed by radiation (4) causing the respective acquired detection value. This dependence is considered while iteratively reconstructing an image of the region of interest, wherein first component attenuation values, which correspond to elements of a first component within the region of interest, and second component attenuation values, which correspond to elements of a first component within the region of interest, are determined, wherein noise values are determined from the first component attenuation values and the second component attenuation values and wherein the noise values are used for updating the image. This consideration of the dependence of the noise of an acquired detection value on the different components improves the quality of the iteratively reconstructed image.
摘要翻译：由成像系统（30）获取的检测值的噪声可以取决于被成像的感兴趣区域内的不同部件的贡献，其已被辐射（4）穿过，导致相应的获取的检测值。考虑这种依赖性，同时迭代地重构感兴趣区域的图像，其中对应于感兴趣区域内的第一分量的元素的第一分量衰减值和对应于第一分量内的第一分量的元素的第二分量衰减值确定感兴趣区域，其中根据第一分量衰减值和第二分量衰减值确定噪声值，并且其中噪声值用于更新图像。对所获取的检测值的噪声对不同分量的依赖性的考虑改善了迭代重建图像的质量。

4. 发明申请

WO2011145040A1 EDGE-PRESERVING NOISE FILTERING 审中-公开
标题翻译：边缘保护噪声滤波
公开(公告)号：WO2011145040A1
公开(公告)日：2011-11-24
申请号：PCT/IB2011/052137
申请日：2011-05-16
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , KOEHLER, Thomas , BRENDEL, Bernhard Johannes
发明人： KOEHLER, Thomas , BRENDEL, Bernhard Johannes
IPC分类号： G06T5/00 , G06T5/50
CPC分类号： G06T5/002 , G06T5/50 , G06T2207/10072 , G06T2207/10116 , G06T2207/20028 , G06T2207/20221
摘要： The invention relates to an image processing apparatus (1) comprising an image providing unit (2) for providing a first image of an object and a second image of the same object and a filtering unit (3) which filters the first image depending on a first degree of similarity between image values of the first image and on a second degree of similarity between image values of the second image. This allows filtering the first image depending on the likeliness that image values belong to the same part of the object, for example, to tissue or to bone material of the object, if the object is a human being or an animal, even if due to noise the image values of one of the first image and the second image are disturbed, thereby improving, for example, an edge preserving property of the filtering procedure.
摘要翻译：本发明涉及一种图像处理装置（1），包括：图像提供单元（2），用于提供对象的第一图像和同一对象的第二图像;以及滤波单元（3），其根据第一图像的图像值与第二图像的图像值之间的第二相似度之间的第一相似度。这允许根据图像值属于对象的相同部分的可能性来过滤第一图像，例如，如果对象是人或动物，即使是由于对象而是对象的组织或骨骼材料第一图像和第二图像之一的图像值被噪声干扰，从而改善了例如滤波过程的边缘保留特性。

5. 发明申请

WO2011027298A1 APPARATUS AND METHOD FOR PROCESSING PROJECTION DATA 审中-公开
标题翻译：用于处理投影数据的装置和方法
公开(公告)号：WO2011027298A1
公开(公告)日：2011-03-10
申请号：PCT/IB2010/053916
申请日：2010-09-01
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH , NIELSEN, Tim , KOEHLER, Thomas , BRENDEL, Bernhard, Johannes
发明人： NIELSEN, Tim , KOEHLER, Thomas , BRENDEL, Bernhard, Johannes
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , A61B6/5258 , G06T2211/412
摘要： The invention relates to a projection values processing apparatus (1) for processing acquired projection values. A first image is reconstructed from acquired projection values under consideration of a reconstruction assumption by a reconstruction unit (13). A simulated projection values determining unit (14) determines simulated projection values by simulating a projection through the reconstructed first image under consideration of the reconstruction assumption, and inconsistency values are determined for the acquired projection values by an inconsistency determining unit (15), wherein an inconsistency value is indicative of a degree of inconsistency of a respective acquired projection value with the reconstruction assumption, by comparing the acquired projection values and the simulated projection values. The inconsistency values can be used for different purposes, for example, improving the quality of a reconstructed image or indicating image elements being affected by an inconsistency between reconstruction assumption and acquired projection values.
摘要翻译：本发明涉及一种用于处理所获取的投影值的投影值处理装置（1）。在由重建单元（13）考虑重建假设的情况下，从获取的投影值重建第一图像。模拟投影值确定单元（14）通过在考虑重构假设的情况下模拟通过重构的第一图像的投影来确定模拟投影值，并且通过不一致性确定单元（15）为所获取的投影值确定不一致值，其中，通过比较所获取的投影值和模拟投影值，不一致值表示相应的获得的投影值与重建假设的不一致程度。不一致值可以用于不同的目的，例如，改善重建图像的质量或指示图像元素受到重建假设和所获取的投影值之间的不一致的影响。

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