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    Multi-tube imaging system scatter correction
    1.
    发明授权
    Multi-tube imaging system scatter correction 有权
    多管成像系统散射校正

    公开(公告)号：US07680241B2

    公开(公告)日：2010-03-16

    申请号：US12305458

    申请日：2007-06-13

    申请人： Bernd David ,  Michael Grass ,  Astrid Fatou Lewalter ,  Rainer Pietig

    发明人： Bernd David ,  Michael Grass ,  Astrid Fatou Lewalter ,  Rainer Pietig

    IPC分类号： A61B6/00

    CPC分类号： G01T1/2985 ,  A61B6/032 ,  A61B6/4014 ,  A61B6/483 ,  A61B6/5282 ,  A61B6/583

    摘要： A computed tomography reconstruction method includes concurrently emitting radiation from at least two x-ray sources (14), switching the output state of each of the at least two x-ray sources (14) within a plurality of respective cross scatter sampling intervals (50, 52, 54, 56) and detecting with a corresponding one of the sets of detectors (24) cross scatter radiation emitted by the other at least two x-ray sources (14), wherein the cross scatter sampling intervals are angularly spaced over a plurality of frames to allow the at least two x-ray sources (14) to concurrently emit radiation throughout at least one frame, deriving scatter correction data for each set of detectors (24) from corresponding cross scatter samples, scatter correcting the projection data with corresponding scatter correction data, and reconstructing the scatter corrected projection data to generate at least one image.

    摘要翻译： 计算机断层摄影重建方法包括同时从至少两个X射线源（14）发射辐射，在多个相应的交叉散射采样间隔（50）内切换所述至少两个X射线源（14）中的每一个的输出状态 ，52,54,56），并且用所述检测器组（24）中的对应的一组检测由所述另外的至少两个x射线源（14）发射的散射辐射，其中所述交叉散射采样间隔在 多个帧以允许至少两个x射线源（14）同时在至少一个帧中发射辐射，从相应的交叉散射样本导出每组检测器（24）的散射校正数据，利用 对应的散射校正数据，以及重建散射校正投影数据以生成至少一个图像。

    MULTI-TUBE IMAGING SYSTEM SCATTER CORRECTION
    2.
    发明申请
    MULTI-TUBE IMAGING SYSTEM SCATTER CORRECTION 有权
    多管成像系统散热器校正

    公开(公告)号：US20090279659A1

    公开(公告)日：2009-11-12

    申请号：US12305458

    申请日：2007-06-13

    申请人： Bernd David ,  Michael Grass ,  Astrid Fatou Lewalter ,  Rainer Pietig

    发明人： Bernd David ,  Michael Grass ,  Astrid Fatou Lewalter ,  Rainer Pietig

    IPC分类号： H05G1/60 ,  A61B6/00

    CPC分类号： G01T1/2985 ,  A61B6/032 ,  A61B6/4014 ,  A61B6/483 ,  A61B6/5282 ,  A61B6/583

    摘要： A computed tomography reconstruction method includes concurrently emitting radiation from at least two x-ray sources (14), switching the output state of each of the at least two x-ray sources (14) within a plurality of respective cross scatter sampling intervals (50, 52, 54, 56) and detecting with a corresponding one of the sets of detectors (24) cross scatter radiation emitted by the other at least two x-ray sources (14), wherein the cross scatter sampling intervals are angularly spaced over a plurality of frames to allow the at least two x-ray sources (14) to concurrently emit radiation throughout at least one frame, deriving scatter correction data for each set of detectors (24) from corresponding cross scatter samples, scatter correcting the projection data with corresponding scatter correction data, and reconstructing the scatter corrected projection data to generate at least one image.

    摘要翻译： 计算机断层摄影重建方法包括同时从至少两个X射线源（14）发射辐射，在多个相应的交叉散射采样间隔（50）内切换所述至少两个X射线源（14）中的每一个的输出状态 ，52,54,56），并且用所述检测器组（24）中的对应的一组检测由所述另外的至少两个x射线源（14）发射的散射辐射，其中所述交叉散射采样间隔在 多个帧以允许至少两个x射线源（14）同时在至少一个帧中发射辐射，从相应的交叉散射样本导出每组检测器（24）的散射校正数据，利用 对应的散射校正数据，以及重建散射校正投影数据以生成至少一个图像。

    Dynamic perfusion imaging
    3.
    发明授权
    Dynamic perfusion imaging 有权

    公开(公告)号：US09848843B2

    公开(公告)日：2017-12-26

    申请号：US14112047

    申请日：2012-04-17

    申请人： Michael Grass ,  Holger Schmitt

    发明人： Michael Grass ,  Holger Schmitt

    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.

    Perfusion imaging
    4.
    发明授权
    Perfusion imaging 有权

    公开(公告)号：US09597042B2

    公开(公告)日：2017-03-21

    申请号：US13266556

    申请日：2010-04-09

    申请人： Roland Proksa ,  Michael Grass

    发明人： Roland Proksa ,  Michael Grass

    IPC分类号： G06K9/00 ,  A61B6/03 ,  A61B6/00

    CPC分类号： A61B6/032 ,  A61B6/481 ,  A61B6/482 ,  A61B6/486 ,  A61B6/504 ,  A61B6/507

    摘要： A method is disclosed that includes decomposing, with a decomposer, agent-based time series projection data for an object or a subject into at least an agent based component. A projection data decomposer includes a time series decomposer that determines agent-based projection data based on agent-based time series projection data based on at least two energy dependent components. A computer readable storage medium containing instructions which, when executed by a computer, cause the computer to perform the act of determining an agent-based component of agent-based time series projection data utilizing at least two components of the agent-based time series projection is provided.

    Reconstruction for cone-beam computed tomography imaging with off-center flat panel detector
    6.
    发明授权
    Reconstruction for cone-beam computed tomography imaging with off-center flat panel detector 有权
    用偏心平板检测器进行锥束计算机断层扫描成像的重建

    公开(公告)号：US09087404B2

    公开(公告)日：2015-07-21

    申请号：US13697445

    申请日：2011-04-25

    申请人： Eberhard S. Hansis ,  Dirk Schaefer ,  Michael Grass

    发明人： Eberhard S. Hansis ,  Dirk Schaefer ,  Michael Grass

    IPC分类号： G01N23/04 ,  G06T1/00 ,  G06T11/00

    CPC分类号： G06T11/008 ,  G06T11/006 ,  G06T2211/432

    摘要： Computed tomography (CT) reconstruction includes reconstructing an axially extended reconstructed image from a measured cone beam x-ray projection data set (Pm), optionally having an off-center geometry. The reconstructing is performed for an extended volume (eFOV) comprising a reconstructable volume (rFOV) of the measured cone beam x ray data set that is extended along the axial direction. The projection data set may be weighted in the volume domain. Iterative reconstruction may be used, including initializing a constant volume and performing one or more iterations employing a first iterative update followed by one or more iterations employing a second, different iterative update. Alternatively, backprojection filtration (BPF) reconstruction may be used, including transforming the projection data set to a new geometry including finite differences between neighboring projection views and performing BPF using Hilbert filtering along a plurality of different directions and averaging the resultant reconstructed images to generate the final reconstructed image.

    摘要翻译： 计算机断层摄影（CT）重建包括从测量的锥形束X射线投影数据集（Pm）重建轴向延伸的重建图像，可选地具有偏心几何。 对包括沿轴向延伸的测量的锥形束x射线数据集的可重建体积（rFOV）的扩展体积（eFOV）进行重建。 投影数据集可以在体积域中加权。 可以使用迭代重建，包括初始化恒定体积并且使用第一迭代更新执行一个或多个迭代，随后使用第二，不同迭代更新的一个或多个迭代。 或者，可以使用反投影过滤（BPF）重建，包括将投影数据集变换为包括相邻投影视图之间的有限差异的新几何，并且使用沿着多个不同方向的希尔伯特滤波来执行BPF，并平均所得到的重建图像以产生 最终重建图像。

    Image data registration for dynamic perfusion CT
    7.
    发明授权
    Image data registration for dynamic perfusion CT 有权
    用于动态灌注CT的图像数据注册

    公开(公告)号：US09002089B2

    公开(公告)日：2015-04-07

    申请号：US13643167

    申请日：2011-04-12

    申请人： Michael Grass ,  Alfonso Agatino Isola

    发明人： Michael Grass ,  Alfonso Agatino Isola

    IPC分类号： G06K9/00 ,  G06T7/00 ,  A61B6/00

    CPC分类号： G06T7/0026 ,  A61B6/507 ,  G06T7/32 ,  G06T2207/10076 ,  G06T2207/30104

    摘要： A method of registering a 4D contrast enhanced image data set, wherein the 4D contrast enhanced image data set includes image data of the same volume of interest acquired at different timeframes with changing contrast enhancement, the volume of interest includes moving structure, and the different timeframes correspond to a predetermined motion phase of interest in different motion cycles of the moving structure, the method, comprising: registering image data corresponding to a plurality of the different timeframes with reference image from one of the timeframes.

    摘要翻译： 一种注册4D对比度增强图像数据集的方法，其中所述4D对比度增强图像数据集包括在改变对比度增强的不同时间帧处获取的相同感兴趣体积的图像数据，所述感兴趣的体积包括移动结构和不同的时间帧 对应于移动结构的不同运动周期中的感兴趣的预定运动相位，该方法包括：将与多个不同时间帧对应的图像数据与来自其中一个时间帧的参考图像进行对应。