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公开(公告)号：EP2280650B1
公开(公告)日：2019-11-27
申请号：EP09750236.3
申请日：2009-05-15
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公开(公告)号：EP2699163A1
公开(公告)日：2014-02-26
申请号：EP12723528.1
申请日：2012-04-17
发明人： GRASS, Michael , SCHMITT, Holger
IPC分类号： A61B6/00
CPC分类号： A61B6/481 , A61B6/00 , A61B6/486 , A61B6/503 , A61B6/507 , A61B6/5217 , A61B6/542 , A61B6/545 , F04C2270/0421
摘要： A method includes scanning a region of interest, during a contrast agent based perfusion scan, at a predetermined temporal sampling rate during contrast agent uptake in the region of interest, and generating time frame data indicative of the scanned region of interest. The method further includes identifying a predetermined change in an amount of the contrast agent in the region of interest from the time frame data. The method further includes scanning the region of interest at a lower temporal sampling rate, which is lower than the temporal sampling rate during the contrast agent uptake, in response to identifying the predetermined change in the amount of the contrast agent in the region of interest.
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公开(公告)号：EP2643815A1
公开(公告)日：2013-10-02
申请号：EP11799324.6
申请日：2011-11-16
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.
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公开(公告)号：EP2648641B1
公开(公告)日：2020-04-15
申请号：EP11802534.5
申请日：2011-11-25
发明人： SCHMITT, Holger , GRASS, Michael
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公开(公告)号：EP2328477B1
公开(公告)日：2018-05-16
申请号：EP09786596.8
申请日：2009-07-14
IPC分类号： A61B6/03
摘要： An imaging system includes a radiation source (110) that emits radiation that traverses an examination region. A controller (116) activates the radiation source (110) to emit radiation and deactivates the radiation source (110) to stop radiation emission. The controller (116) selectively activates the radiation source (110) to emit radiation at one or more pre-determined angles. In another embodiment, the imaging system includes a data processing component (124) that generates a virtual three dimensional image of an object of interest of the scanned subject based on the image data. In another embodiment, the imaging system is in a communication with a data manipulation and packaging component (128) that generates at least a two dimensional or a three dimensional data set based on the volumetric image data and packages the data set in an object provided to a remote system (132) that manipulates and navigates through the data set.
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6.发明公开ITERATIVE RECONSTRUCTION ALGORITHM WITH A CONSTANT VARIANCE BASED WEIGHTING FACTOR 审中-公开带常数VAR基于权重因子迭代算法重建
公开(公告)号：EP2646985A1
公开(公告)日：2013-10-09
申请号：EP11797148.1
申请日：2011-11-25
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.
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公开(公告)号：EP2643815B1
公开(公告)日：2014-07-23
申请号：EP11799324.6
申请日：2011-11-16
IPC分类号： G06T11/00
CPC分类号： G06T11/005 , G06T11/008 , G06T2211/424
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公开(公告)号：EP2661227A1
公开(公告)日：2013-11-13
申请号：EP12700205.3
申请日：2012-01-04
发明人： SCHMITT, Holger , GRASS, Michael
IPC分类号： A61B6/03
摘要： The present invention relates to a computed tomography system (10) and a corresponding method which enable tracking of a contrast material bolus and which involve a reduced radiation dose. The proposed computed tomography system (10) comprises an acquisition unit including an X-ray source (18) and an X-ray detector (30) for acquiring projection data sets (42, 44, 46), a reconstruction unit (41) for reconstructing a planning image (48) from a first projection data set (42), an identification unit (52) for identifying a region of interest (40) in the planning image (48), a selection unit (54) for selecting a projection angle (60) through the region of interest (40), a calculator (62) for calculating a target projection value (64) for a projection of said region of interest (40) with the selected projection angle (60), a control unit (32) for controlling said acquisition unit to acquire a second, reduced projection data set (44) including projection data from projections of said region of interest (40) with the selected projection angle (60), and a comparator (68) for comparing projection values of the second projection data set (44) with the target projection value (64), wherein the control unit (32) is adapted to control the acquisition unit to initiate the acquisition of a third projection data set (46) based on the comparison result (70) and to reconstruct a diagnostic image (50) from the third projection data set (46).
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公开(公告)号：EP2699163B1
公开(公告)日：2019-06-26
申请号：EP12723528.1
申请日：2012-04-17
发明人： GRASS, Michael , SCHMITT, Holger
IPC分类号： A61B6/00
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10.发明授权
公开(公告)号：EP2385793B1
公开(公告)日：2018-09-19
申请号：EP09801783.3
申请日：2009-12-09
CPC分类号： A61B6/587 , A61B6/032 , A61B6/4035 , A61B6/508 , G21K1/10
摘要： A method and apparatus are provided to filter x-ray beams generated using a CT apparatus or other x-ray based system with displaced acquisition geometry. A CT apparatus may be used having a source (102), a detector (104) transversely displaced from a center (114) of a field of view (118) during acquisition of the projection data, and a filter (146). The filter may absorb at least a portion of overlapping radiation emitted by the source at opposing angular positions. The amount of transverse displacement may be determined for a desired field of view configuration and amount of overlapping radiation. The detector may be adjusted to correspond to the amount of determined transverse displacement. The size and location of the filter may be determined based on the amount of overlapping radiation. The filter may be adjusted to correspond to the determined size and location of the filter.
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