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公开(公告)号：EP2496142A1
公开(公告)日：2012-09-12
申请号：EP10782035.9
申请日：2010-10-26
发明人： KOEHLER, Thomas
CPC分类号： A61B6/032 , A61B6/4035 , A61B6/4233 , A61B6/5264 , A61B6/542 , G06T11/006
摘要： The invention relates to a computed tomography apparatus comprising a radiation source (2) and a detector (6) for generating detection values depending on a conical radiation beam (4). A weight providing unit (12) provides,for combinations of voxels of an image and detection values,weights for weighting the detection values,and a beam shaper shapes the conical radiation beam (4) such that for at least a part of the detection values the inverse of the variance of a respective detection value is positively correlated with an average of the weights corresponding to the combinations of the voxels, which correspond to the respective detection value, and the respective detection value. This shaping of the conical radiation beam improves the signal-to-noise ratio of the weighted detection values.
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公开(公告)号：EP2206084B1
公开(公告)日：2012-04-18
申请号：EP08807562.7
申请日：2008-09-05
发明人： KOEHLER, Thomas , WIEMKER, Rafael
IPC分类号： G06T7/00
CPC分类号： G06T7/0012 , G06T11/008 , G06T2207/10072 , G06T2207/30064
摘要： The invention relates to a method and an image processing device (10) for the evaluation of image raw-data of a body region generated with an imaging device like a CT scanner (30). From the image raw-data, a first image (ICAD) is reconstructed with a reconstruction module (12) according to reconstruction parameters (p) set optimally by a computer aided detection and/or diagnosis (CAD) module (13). This module can then evaluate an image (ICAD) that was reconstructed optimally according to its own requirements, for example with respect to image size and/or resolution, to find features of interest.
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公开(公告)号：EP2411985A1
公开(公告)日：2012-02-01
申请号：EP10712556.9
申请日：2010-03-19
发明人： ROESSL, Ewald , KOEHLER, Thomas
CPC分类号： G21K1/06 , G02B27/52 , G21K2207/005
摘要： An achromatic phase-contrast imaging apparatus for examining an object of interest is provided which comprises two different phase gratings which have different pitches. Thus, the imaging apparatus yields phase-contrast information for two different energies. Thus, phase-information over a wider energy band can be used.
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公开(公告)号：EP2410921A1
公开(公告)日：2012-02-01
申请号：EP10710906.8
申请日：2010-03-15
发明人： ROESSL, Ewald , KOEHLER, Thomas , MARTENS, Gerhard
CPC分类号： G21K7/00 , A61B6/4291 , A61B6/484 , A61B6/502
摘要： The invention relates to an X-ray differential phase-contrast imaging system which has three circular gratings. The circular gratings are aligned with the optical axis of the radiation beam and a phase stepping is performed along the optical axis with the focal spot, the phase grating and/or the absorber grating. The signal measured is the phase-gradient in radial direction away from the optical axis.
摘要翻译： X射线差分相位对比成像系统具有三个圆形光栅。 圆形光栅与辐射束的光轴对准，并且沿着光轴与焦点，相位光栅和/或吸收器光栅执行相位步进。 测量的信号是远离光轴的径向相位梯度。
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25.发明公开METHOD AND APPARATUS TO IMPROVE CT IMAGE ACQUISITION USING A DISPLACED GEOMETRY 有权用于改进CT影像使用几何图形的记录方法和设备进行的偏移
公开(公告)号：EP2331945A2
公开(公告)日：2011-06-15
申请号：EP09744753.6
申请日：2009-10-05
发明人： FORTHMANN, Peter , KOEHLER, Thomas , VAN STEVENDAAL, Udo , BERTRAM, Matthias , WIESNER, Steffen , SCHRETTER, Colas
摘要： A method and apparatus are provided to improve CT image acquisition using a displaced acquisition geometry. A CT apparatus may be used having a source (102) and a detector (104) transversely displaced from a center (114) of a field of view (118) during acquisition of the projection data. The amount of transverse displacement may be determined based on the size of the object (108). The source and the detector may be adjusted to vary the size of the transverse field of view. The first data set acquired by the detector may be reconstructed and used to simulate missing projection data that could not be acquired by the detector at each projection angle. The measured projection data and the simulated projection data may be used to obtain a second data set. The second data set may be compared to the first data set to produce a corrected data set.
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公开(公告)号：EP2313794A1
公开(公告)日：2011-04-27
申请号：EP09786885.5
申请日：2009-08-11
发明人： SCHMALE, Ingo , KOEHLER, Thomas
IPC分类号： G01R33/385 , G01R33/28 , G10K11/175
CPC分类号： G10K11/175 , G01R33/288 , G01R33/3854 , H04K3/42 , H04K3/45 , H04K3/825 , H04K2203/12
摘要： When subjecting a patient to an MRI scan, noise generated by gradient coils in an MRI device is beautified by playing a complementary musical piece that matches the gradient coil noise in one or both of tempo and musical key. Complementary musical pieces (e.g., songs, tunes, melodies, etc.) are pre-generated for specific gradient coil sequences. Upon selection of one or more sequences to be executed during an MR scan, complementary musical pieces for the selected sequence(s) are identified and played back to a patient in the bore of the MRI device during the scan to alleviate patient stress. Tempo and/or musical key of the complementary musical pieces is adjustable (a priori or in real time) to synchronize the complementary musical piece(s) to a specific gradient sequence both rhythmically and harmonically.
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公开(公告)号：EP2208184A2
公开(公告)日：2010-07-21
申请号：EP08763298.0
申请日：2008-06-11
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , A61B6/5258
摘要： The invention relates to an apparatus for determining a high density region in an image, wherein the apparatus comprises a provision unit (1, 2, 6, 7, 8) for providing projection data for reconstructing the image. The apparatus comprises further a high density shadow determination unit (12) for determining a high density shadow in the projection data and a backprojection unit (13) for backprojecting the determined high density shadow resulting in a high density image showing the high density region. The inventions relates further to a corresponding method and computer program for determining a high density region in an image.
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公开(公告)号：EP2059171A2
公开(公告)日：2009-05-20
申请号：EP07826161.7
申请日：2007-08-28
发明人： BONTUS, Claas , GRASS, Michael , KOEHLER, Thomas
IPC分类号： A61B6/03
摘要： 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.
摘要翻译： 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：EP1861825B1
公开(公告)日：2008-10-08
申请号：EP06711064.3
申请日：2006-03-09
发明人： ZIEGLER, Andy , GRASS, Michael , KOEHLER, Thomas
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/424
摘要： The invention relates to a method and a device for the iterative reconstruction of cross-sectional images of the heart (7) of a patient based on projections (P1, ... P5) from different directions which are for example generated with a helical cone-beam CT scanner. A cardiac weight function (f) quantifies how near the projections (P1, ...) are to a given observation phase (To) of the heart cycle based on simultaneously recorded electrocardiographic signals (ECG). The whole set of projections (P1, ...) is divided into subsets (S1, ...) which each contain only projections corresponding to a similar cardiac weight (f), and an iterative reconstruction algorithm like ART uses in one update or iteration step all projections of such a subset (S1, ...) simultaneousl .
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30.发明公开A COMPUTED TOMOGRAPHY METHOD FOR THE RECONSTRUCTION OF OBJECT IMAGES FROM REAL AND FICTITIOUS MEASURED VALUES 有权电子计算机断层扫描方法的物体图像从真实与虚构测重建
公开(公告)号：EP1769460A1
公开(公告)日：2007-04-04
申请号：EP05762277.1
申请日：2005-07-04
发明人： FORTHMANN, Peter , KOEHLER, Thomas
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/421 , Y10S378/901
摘要： 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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