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353 条记录 (耗时 0.036 秒)

    Methods and apparatus for helical reconstruction for multislice CT scan
    41.
    发明授权
    Methods and apparatus for helical reconstruction for multislice CT scan 失效
    用于多层CT扫描的螺旋重建的方法和装置

    公开(公告)号：US06980681B1

    公开(公告)日：2005-12-27

    申请号：US09557108

    申请日：2000-04-24

    申请人： Jiang Hsieh

    发明人： Jiang Hsieh

    IPC分类号： A61B6/03 ,  G01N23/04 ,  G06T1/00 ,  G06T11/00 ,  G06K9/00

    CPC分类号： A61B6/032 ,  A61B6/027 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612 ,  G06T11/006 ,  G06T2211/421

    摘要： One embodiment of the present invention is a method for imaging an object with a computed tomographic (CT) imaging system that includes steps of helically scanning the object with a multi-slice CT imaging system to acquire attenuation measurements of the object, the measurements including more than two conjugate samples for estimation of a projection at a plane of reconstruction of the object; and filtering and backprojecting the attenuation measurements of the object, including the more than two conjugate samples, to reconstruct at least one image slice of the object. An improved sampling pattern and better use of the attenuation samples obtained during a scan is thus provided.

    摘要翻译： 本发明的一个实施例是一种用计算机断层摄影（CT）成像系统对物体进行成像的方法，所述计算机断层摄影（CT）成像系统包括用多层CT成像系统螺旋扫描物体以获取物体的衰减测量的步骤，所述测量包括更多 比用于估计物体重建平面处的投影的两个共轭样本; 并且对包括多于两个共轭样本的对象的衰减测量进行滤波和反投影来重建对象的至少一个图像切片。 因此提供了在扫描期间获得的衰减样本的改进的采样模式和更好的使用。

    Methods and apparatus for CT smoothing to reduce artifacts
    42.
    发明申请
    Methods and apparatus for CT smoothing to reduce artifacts 审中-公开
    用于CT平滑减少伪像的方法和装置

    公开(公告)号：US20050201605A1

    公开(公告)日：2005-09-15

    申请号：US10798650

    申请日：2004-03-11

    申请人： Jianying Li ,  Jiang Hsieh

    发明人： Jianying Li ,  Jiang Hsieh

    IPC分类号： G06K9/00

    CPC分类号： G06T11/005 ,  A61B6/027 ,  G06T11/003 ,  G06T2211/421

    摘要： A method for reconstructing an image of an object includes scanning an object using a computed tomographic (CT) imaging apparatus to acquire projections of the object. A set of thresholds are determined utilizing the projections, and selected smoothing kernels are associated with the thresholds. The method further includes utilizing the smoothing kernels and the projections to produce smoothed projections in accordance with the thresholds and filtering and backprojecting the smoothed projections to generate an image of the object.

    摘要翻译： 用于重建对象的图像的方法包括使用计算机断层摄影（CT）成像设备扫描对象以获取对象的投影。 使用投影来确定一组阈值，并且所选择的平滑内核与阈值相关联。 该方法还包括利用平滑内核和投影来根据阈值产生平滑的投影，并过滤和反投影平滑的投影以生成对象的图像。

    Iterative reconstruction methods for multi-slice computed tomography
    44.
    发明授权
    Iterative reconstruction methods for multi-slice computed tomography 有权
    多层计算机断层扫描的迭代重建方法

    公开(公告)号：US06907102B1

    公开(公告)日：2005-06-14

    申请号：US10319674

    申请日：2002-12-16

    申请人： Ken Sauer ,  Charles A. Bouman ,  Jean-Baptiste Thibault ,  Jiang Hsieh

    发明人： Ken Sauer ,  Charles A. Bouman ,  Jean-Baptiste Thibault ,  Jiang Hsieh

    IPC分类号： A61B6/03 ,  G06T11/00 ,  A61B6/00

    CPC分类号： G06T11/006 ,  A61B6/027 ,  A61B6/032 ,  A61B6/4085 ,  G06T2211/424 ,  Y10S378/901

    摘要： A multi-slice computed tomography imaging system is provided including a source that generates an x-ray beam and a detector array that receives the x-ray beam and generates projection data. A translatable table has an object thereon and is operable to translate in relation to the source and the detector array. The source and the detector array rotate about the translatable table to helically scan the object. An image reconstructor is electrically coupled to the detector array and reconstructs an image in response to the projection data using a computed tomography modeled iterative reconstruction technique. The iterative reconstruction technique includes determining a cross-section reconstruction vector, which approximately matches the projection data via a computed tomography model. Methods for performing the same are also provided including accounting for extended boundary regions.

    摘要翻译： 提供了一种多切片计算机断层摄影成像系统，其包括产生X射线束的源和接收X射线束并产生投影数据的检测器阵列。 一个可翻译的桌子上有一个物体，它可以相对于源和检测器阵列进行平移。 源和检测器阵列绕可翻译表旋转以螺旋扫描对象。 图像重构器电耦合到检测器阵列，并且使用计算机断层摄影建模的迭代重建技术来响应于投影数据重建图像。 迭代重建技术包括确定通过计算机断层摄影模型近似匹配投影数据的横截面重建矢量。 还提供了用于执行该方法的方法，包括扩展边界区域的计算。

    Image space compensation scheme for reducing artifacts
    48.
    发明授权
    Image space compensation scheme for reducing artifacts 有权
    用于减少伪影的图像空间补偿方案

    公开(公告)号：US06570951B1

    公开(公告)日：2003-05-27

    申请号：US10063799

    申请日：2002-05-14

    申请人： Jiang Hsieh

    发明人： Jiang Hsieh

    IPC分类号： A61B603

    CPC分类号： G06T11/008 ,  A61B6/032 ,  A61B6/5258 ,  G06T5/002 ,  G06T5/20 ,  G06T2207/10081 ,  G06T2207/30004 ,  Y10S378/901

    摘要： A method and system for reducing artifacts in an x-ray image generated by a computed tomography imaging system using an image space compensation scheme including obtaining reconstructed image data generated using an image reconstruction algorithm, determining a noise variation characteristic for the reconstruction algorithm, filtering the reconstructed image data so as to create smoothed image data and processing the smoothed image data and the reconstructed image data so as to create corrected image data. Also claimed is a medium encoded with a machine-readable computer program code for reducing artifacts in an x-ray image, the medium including instructions for causing controller to implement the aforementioned method.

    摘要翻译： 一种用于减少由使用图像空间补偿方案的计算机断层成像系统产生的X射线图像中的假象的方法和系统，所述图像空间补偿方案包括获得使用图像重构算法生成的重建图像数据，确定重建算法的噪声变化特性， 重建图像数据，以便产生平滑的图像数据并处理平滑的图像数据和重建的图像数据，以便产生校正的图像数据。 还要求保护的是具有用于减少X射线图像中的伪影的机读计算机程序代码的介质，该介质包括用于使控制器实现上述方法的指令。

    Methods and apparatus for compensating computed tomographic channel ganging artifacts
    49.
    发明授权
    Methods and apparatus for compensating computed tomographic channel ganging artifacts 有权
    用于补偿计算机断层摄影通道组合人造物的方法和装置

    公开(公告)号：US06535572B2

    公开(公告)日：2003-03-18

    申请号：US09882770

    申请日：2001-06-15

    申请人： Jiang Hsieh ,  Jianying Li ,  Thomas L. Toth

    发明人： Jiang Hsieh ,  Jianying Li ,  Thomas L. Toth

    IPC分类号： A61B603

    CPC分类号： A61B6/4028 ,  A61B6/032 ,  A61B6/5205

    摘要： A CT imaging system and method are provided in which groups of adjacent detector elements of a detector array are ganged in an x-direction; and an object is scanned using the ganged groups of adjacent detector elements to acquire projection data. In one embodiment, to reduce degradation of images resulting from the ganged detector elements, an image of the object is reconstructed utilizing the acquired projection data and an adjusted iso-channel of the multislice detector array different from an iso-channel defined for scans performed without utilizing ganged groups of detector elements.

    摘要翻译： 提供了一种CT成像系统和方法，其中检测器阵列的相邻检测器元件组沿x方向组合; 并且使用相邻检测器元件的组合组来扫描对象以获取投影数据。 在一个实施例中，为了减少由组合的检测器元件产生的图像的劣化，使用所获取的投影数据和多重检测器阵列的经调整的等通道来重建对象的图像，其不同于为没有 利用组合的探测器元件。