METHOD AND X-RAY DEVICE FOR CREATING AN X-RAY PROJECTION IMAGE
    4.
    发明申请
    METHOD AND X-RAY DEVICE FOR CREATING AN X-RAY PROJECTION IMAGE 审中-公开
    用于创建X射线投影图像的方法和X射线装置

    公开(公告)号:US20120069950A1

    公开(公告)日:2012-03-22

    申请号:US13233071

    申请日:2011-09-15

    IPC分类号: A61B6/02 A61B6/03

    摘要: A method and an X-ray device are disclosed for creating an X-ray projection image of a three-dimensional object under examination and for displaying the projection image. In at least one embodiment, pixel images are recorded from two different perspectives and a projection image is created by overlaying the two pixel images, wherein perspective-related offset of the mapping image pixels is taken into account, pixel-by-pixel, in relation to an imaging surface in the object under examination.

    摘要翻译: 公开了一种用于创建被检查的三维物体的X射线投影图像并用于显示投影图像的方法和X射线装置。 在至少一个实施例中,从两个不同的角度记录像素图像,并且通过重叠两个像素图像来创建投影图像,其中映射图像像素的透视相关偏移被逐个像素地考虑在内 到被检查物体中的成像表面。

    Method of reconstructing CT image data
    5.
    发明授权
    Method of reconstructing CT image data 有权
    重建CT图像数据的方法

    公开(公告)号:US08005287B2

    公开(公告)日:2011-08-23

    申请号:US12457972

    申请日:2009-06-26

    IPC分类号: G06K9/00 A61B6/00 A61B5/05

    CPC分类号: G06T11/006 G06T2211/424

    摘要: A method is disclosed for reconstructing CT image data. In at least one embodiment, the method includes providing measured CT projection data p based on the CT projection data p, reconstructing first CT image data fk=1, and on the basis of the first image data fk=1 iteratively generating k+1-th CT-image data according to the formula: fk+1=fk−α(Q(Pfk−p)+βR(fk)) until the standard ∥fk+1−fk∥2 is ≦n, with the reconstruction operator Q containing a noise weighting according to Q=B·Wstatist.·H. Aside from suppressing “cone” artifacts, the proposed method of at least one embodiment indicates a significant reduction in the image noise even after a few iterations.

    摘要翻译: 公开了一种重建CT图像数据的方法。 在至少一个实施例中,该方法包括基于CT投影数据p提供测量的CT投影数据p,重建第一CT图像数据fk = 1,并且基于第一图像数据fk = 1迭代地生成k + 根据以下公式计算CT图像数据:fk + 1 = fk-α(Q(Pfk-p)+&bgr; R(fk)),直到标准∥fk+ 1-fk‖2为≦̸ n, 重构算子Q根据Q = B·Wstatist包含噪声加权。 除了抑制“锥形”伪像之外,至少一个实施例的所提出的方法指示即使在几次迭代之后图像噪声也显着降低。

    Method and device for segmenting at least one substance in an x-ray image
    6.
    发明申请
    Method and device for segmenting at least one substance in an x-ray image 有权
    用于在x射线图像中分割至少一种物质的方法和装置

    公开(公告)号:US20070092127A1

    公开(公告)日:2007-04-26

    申请号:US11581149

    申请日:2006-10-16

    IPC分类号: G06K9/00 G06K9/34

    摘要: A method is disclosed for generating CT displays in x-ray computed tomography with contrast medium support, the blooming effect being reduced by decomposing an object into three material components when scanning the object with two different energy spectra, and determining a first component and determining the material thickness thereof by segmentation. Subsequently, in at least one embodiment, the two other material components and their material thicknesses are determined on the basis of the measured attenuation values of the two spectra for each beam, and virtual absorption data with virtual absorption coefficients are constructed for the individual material components from the material strengths thus known for the different material components, and are used to reconstruct the CT display.

    摘要翻译: 公开了一种用于在具有造影介质支持的x射线计算机断层摄影中生成CT显示器的方法,通过在用两个不同的能量谱扫描物体时将物体分解为三个材料成分,并且确定第一成分并确定 材料厚度通过分割。 随后,在至少一个实施例中,基于每个光束的两个光谱的测量衰减值来确定两个其它材料部件及其材料厚度,并且为各个材料部件构造具有虚拟吸收系数的虚拟吸收数据 从对于不同材料组分而言已知的材料强度,并用于重建CT显示。

    Method of reconstructing CT image data
    7.
    发明申请
    Method of reconstructing CT image data 有权
    重建CT图像数据的方法

    公开(公告)号:US20090324045A1

    公开(公告)日:2009-12-31

    申请号:US12457972

    申请日:2009-06-26

    IPC分类号: G06K9/00

    CPC分类号: G06T11/006 G06T2211/424

    摘要: A method is disclosed for reconstructing CT image data. In at least one embodiment, the method includes providing measured CT projection data p based on the CT projection data p, reconstructing first CT image data fk=1, and on the basis of the first image data fk=1 iteratively generating k+1-th CT-image data according to the formula: fk+1=fk−α(Q(Pfk−p)+βR(fk)) until the standard ∥fk+1−fk∥2 is ≦n, with the reconstruction operator Q containing a noise weighting according to Q=B·Wstatist.·H. Aside from suppressing “cone” artifacts, the proposed method of at least one embodiment indicates a significant reduction in the image noise even after a few iterations.

    摘要翻译: 公开了一种重建CT图像数据的方法。 在至少一个实施例中,该方法包括基于CT投影数据p提供测量的CT投影数据p,重建第一CT图像数据fk = 1,并且基于第一图像数据fk = 1迭代地生成k + 直到标准∥fk+ 1-fk‖2为<= n,与重建算子相对应,根据以下公式fk + 1 = fk-α(Q(Pfk-p)+βR(fk))的CT图像数据 Q包含根据Q = B.Wstatist..H的噪声加权。 除了抑制“锥形”伪像之外,至少一个实施例的所提出的方法指示即使在几次迭代之后图像噪声也显着降低。

    Method and device for segmenting at least one substance in an x-ray image
    8.
    发明授权
    Method and device for segmenting at least one substance in an x-ray image 有权
    用于在x射线图像中分割至少一种物质的方法和装置

    公开(公告)号:US07903860B2

    公开(公告)日:2011-03-08

    申请号:US11581149

    申请日:2006-10-16

    IPC分类号: G06K9/56

    摘要: A method and a device are disclosed for segmenting at least one substance in an x-ray image. In at least one embodiment of the method, two attenuation values relating to different energies of an x-radiation are acquired in relation to each pixel. The pixels are mapped into a two-dimensional feature space on the basis of the acquired attenuation values, and there is subsequently determined as assessment variable from the mapping of an image environment respectively assigned to the pixels the number of those pixels that fall in a classification region assigned to the substance. It is then possible to calculate in a simple way on the basis of the assessment variable a segmented image that contains the substance and in which misclassification can largely be avoided by taking account of the neighborhood relationship of the pixels.

    摘要翻译: 公开了用于在x射线图像中分割至少一种物质的方法和装置。 在该方法的至少一个实施例中,相对于每个像素获取与x辐射的不同能量相关的两个衰减值。 基于所获取的衰减值将像素映射到二维特征空间中,并且随后根据分别分配给像素的图像环境的映射确定为评估变量,这些像素属于分类中的那些像素的数量 分配给物质的区域。 然后可以以简单的方式计算包含物质的分割图像的评估变量,并且通过考虑像素的邻域关系可以在很大程度上避免误分类。

    Method for an X-ray machine
    9.
    发明授权
    Method for an X-ray machine 有权
    X光机的方法

    公开(公告)号:US07840043B2

    公开(公告)日:2010-11-23

    申请号:US11499662

    申请日:2006-08-07

    IPC分类号: G06K9/00

    摘要: A method is for determining a parameter in an image area as a measure of a homogeneity of a substance in an object, and to a method for segmenting a substance in an image that uses the parameter as an additional segmentation criterion. In the method, at least two X-ray images are acquired in relation to different energies E1, E2 of an X-radiation, and the parameter is determined from the statistical distribution of attenuation values Di(E1),Di(E2) where i=1, . . . , N in the image area such that faulty classifications can be avoided in a simple way during the segmentation.

    摘要翻译: 一种用于确定图像区域中的参数作为物体中物质的均匀度的量度的方法,以及用于将使用该参数的图像中的物质分割为附加分割标准的方法。 在该方法中,相对于X射线的不同能量E1,E2获取至少两个X射线图像,并且根据衰减值Di(E1),Di(E2)的统计分布来确定参数,其中i = 1,。 。 。 ,N,使得在分割期间可以以简单的方式避免错误的分类。

    Method for an X-ray machine
    10.
    发明申请
    Method for an X-ray machine 有权
    X光机的方法

    公开(公告)号:US20070030944A1

    公开(公告)日:2007-02-08

    申请号:US11499662

    申请日:2006-08-07

    摘要: A method is for determining a parameter in an image area as a measure of a homogeneity of a substance in an object, and to a method for segmenting a substance in an image that uses the parameter as an additional segmentation criterion. In the method, at least two X-ray images are acquired in relation to different energies E1, E2 of an X-radiation, and the parameter is determined from the statistical distribution of attenuation values Di(E1),Di(E2) where i=1, . . . , N in the image area such that faulty classifications can be avoided in a simple way during the segmentation.

    摘要翻译: 一种用于确定图像区域中的参数作为物体中物质的均匀性的量度的方法,以及用于将使用该参数的图像中的物质分割为附加分割标准的方法。 在该方法中,相对于X射线的不同能量E 1,E 2获取至少两个X射线图像,并且根据衰减值Di(E 1),Di(E)的统计分布来确定参数 2)其中i = 1,。 。 。 ,N,使得在分割期间可以以简单的方式避免错误的分类。