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    • 71. 发明授权
    • Reconstruction method for computer tomography and computer tomograph
    • 计算机断层扫描和计算机断层扫描重建方法
    • US07856079B2
    • 2010-12-21
    • US11719304
    • 2005-11-07
    • Tim NielsenMichael Grass
    • Tim NielsenMichael Grass
    • A61B6/00
    • G06T11/006A61B6/027G06T2211/424
    • It is an object of the invention to provide spiral computer tomography which has a high image quality. It relates to a reconstruction method for computer tomography of the heart, wherein the image is reconstructed from a data component of recordings of a partial detector path of a detector device and from a data component of recordings of a full detector path of the detector device, and to a computer tomograph having a beam source, a drive arrangement for driving the beam source in a spiral path around an object, a detector device for recording the radiation from the beam source which passes at least partially through the object, and a control device for reconstructing data components of a partial detector path and a full detector path.
    • 本发明的目的是提供具有高图像质量的螺旋计算机断层摄影。 本发明涉及用于心脏计算机断层摄影的重建方法,其中根据检测器装置的部分检测器路径的记录的数据分量和检测器装置的完整检测器路径的记录的数据分量来重建图像, 以及具有光束源的计算机断层摄影机,用于以围绕物体的螺旋路径驱动光束源的驱动装置,用于记录来自至少部分穿过物体的光束源的辐射的检测器装置,以及控制装置 用于重构部分检测器路径和完整检测器路径的数据分量。
    • 72. 发明申请
    • APPARATUS FOR DETERMINING A PARAMETER OF A MOVING OBJECT
    • 用于确定移动对象参数的装置
    • US20100266182A1
    • 2010-10-21
    • US12741397
    • 2008-11-04
    • Michael GrassAndy Ziegler
    • Michael GrassAndy Ziegler
    • G06K9/00
    • G06T7/251G06T7/246G06T2207/10076G06T2207/10081G06T2207/20004G06T2207/20092G06T2207/30048
    • The present invention relates to an apparatus for determining a parameter of a moving object, wherein the apparatus comprises an adaptive model providing unit (12) for providing an adaptive model of the object. The user can define the region of the adaptive model by a user interface (13). The apparatus further comprises an image data set providing unit (14) for providing a spatially and temporally dependent image data set of the moving object and an adaptation unit (15) for adapting at least a defined region of the adaptive model to the spatially and temporally dependent image data set for determining a spatially and temporally dependence of the defined region. The parameter of the moving object is determined depending on the spatially and temporally dependence of the defined region by a parameter determining unit (16).
    • 本发明涉及一种用于确定移动物体的参数的装置,其中,所述装置包括用于提供对象的自适应模型的自适应模型提供单元(12)。 用户可以通过用户界面(13)来定义自适应模型的区域。 该装置还包括用于提供移动物体的空间和时间上依赖的图像数据集的图像数据集提供单元(14),以及适配单元(15),用于至少将自适应模型的定义区域适应于空间和时间上 用于确定所定义区域的空间和时间依赖性的依赖图像数据集。 取决于由参数确定单元(16)定义的区域的空间和时间依赖性来确定移动对象的参数。
    • 79. 发明授权
    • Method and device for flow reconstruction
    • 流量重建方法和装置
    • US07505551B2
    • 2009-03-17
    • US10568838
    • 2004-08-10
    • Michael GrassVolker Rasche
    • Michael GrassVolker Rasche
    • A61B6/03
    • A61B6/481A61B6/4441A61B6/466A61B6/504A61B6/541
    • The invention relates to a method and a device for the three-dimensional reconstruction of the flow conditions in a vascular system (3), in which, in a first phase after the beginning of a contrast-medium injection, X-ray projection pictures are produced from the same direction (A) at a high picture-taking rate in order to observe the inflow of the contrast medium. When the contrast medium fills the vascular system (3), a rotation of the Xray device (1) takes place during which projection pictures are produced at a lower picture taking rate and/or at a lower radiation dose, from which pictures the three-dimensional structure of the vascular tree can be reconstructed. Optionally, at the end of the rotation, projection pictures may again be taken from a fixed direction that observe the drainage of the contrast medium from the vascular system (3).
    • 本发明涉及一种用于三维重建血管系统(3)中的流动状态的方法和装置,其中在开始造影剂注射后的第一阶段,X射线投影图像是 以相同的方向(A)以高拍摄速度产生,以观察造影剂的流入。 当造影剂填充血管系统(3)时,发生X射线装置(1)的旋转,在该旋转装置(1)期间以较低的拍摄速度和/或较低的辐射剂量产生投影图像, 可以重建血管树的三维结构。 可选地,在旋转结束时,投影图片可以再次从观察造影剂从血管系统(3)排出的固定方向获取。
    • 80. 发明申请
    • Advanced Convergence for Multiple Iterative Algorithm
    • 多重迭代算法的高级收敛
    • US20080273656A1
    • 2008-11-06
    • US12096911
    • 2006-12-04
    • Andy ZieglerMichael Grass
    • Andy ZieglerMichael Grass
    • A61B6/00G06K9/00
    • G06T11/005G06T2211/424
    • Iterative methods for reconstructing of three-dimensional images based on projection data signals obtained by a computer tomography system often result in wrong absorption coefficients in particular for regions including a hollow space of an object under examination. Furthermore iterative methods show a slow convergence for calculating such absorption coefficients. According to embodiments of the present invention there is provided a method for an advanced reconstruction of three-dimensional images based on modified projection data signals. The modification includes an addition of a constant absorption value to the measured projection data. Advantageously the constant absorption value is an absorption line integral through a virtual body having the spatial constant absorption coefficient of water. The virtual body preferably has a volume which is slightly bigger than the object of interest.
    • 基于由计算机断层摄影系统获得的投影数据信号重建三维图像的迭代方法通常导致错误的吸收系数,特别是对于包括被检查物体的中空空间的区域。 此外,迭代方法显示计算这种吸收系数的缓慢收敛。 根据本发明的实施例,提供了一种基于经修改的投影数据信号对三维图像进行高级重建的方法。 修改包括对所测量的投影数据添加恒定的吸收值。 有利地,恒定吸收值是通过具有水的空间常数吸收系数的虚拟体积分的吸收线。 虚拟体优选地具有比感兴趣对象略大的体积。