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353 条记录 (耗时 0.032 秒)

    Methods and apparatus for truncation compensation
    91.
    发明授权
    Methods and apparatus for truncation compensation 失效
    截肢补偿的方法和装置

    公开(公告)号：US07254259B2

    公开(公告)日：2007-08-07

    申请号：US10615411

    申请日：2003-07-03

    申请人： Jiang Hsieh ,  Brian Grekowicz ,  Edward Henry Chao ,  Scott Matt McOlash ,  Amy Lynn Horst

    发明人： Jiang Hsieh ,  Brian Grekowicz ,  Edward Henry Chao ,  Scott Matt McOlash ,  Amy Lynn Horst

    IPC分类号： G06K9/00

    CPC分类号： A61B6/032 ,  A61B6/583

    摘要： A method includes calculating a sum of all samples at each projection view of a scan of an object, determining a maximum value of the calculated sums, averaging a plurality of samples m at a projection view index k when the sum of all samples at index k is less than a predetermined percentage of the maximum value, comparing the average to a threshold t, determining the projection truncated when the average is greater than t, and determining the projection not truncated when the average is not greater than t.

    摘要翻译： 一种方法包括：计算对象扫描的每个投影视图处的所有样本的总和，确定所计算出的和的最大值，在索引k处的所有样本的和之间以投影视图索引k平均多个样本m 小于最大值的预定百分比，将平均值与阈值t进行比较，确定当平均值大于t时截断的投影，以及当平均值不大于t时确定投影未被截断。

    Method and apparatus for field-of-view expansion of volumetric CT imaging
    94.
    发明申请
    Method and apparatus for field-of-view expansion of volumetric CT imaging 有权
    体积CT成像的视野展开方法和装置

    公开(公告)号：US20070116344A1

    公开(公告)日：2007-05-24

    申请号：US11286919

    申请日：2005-11-23

    申请人： Jiang Hsieh ,  Albert Henry Lonn ,  Mark Nyka

    发明人： Jiang Hsieh ,  Albert Henry Lonn ,  Mark Nyka

    IPC分类号： G06K9/00

    CPC分类号： A61B6/032 ,  A61B6/4085 ,  A61B6/5235 ,  A61B6/583 ,  G06T11/005 ,  G06T2211/432

    摘要： A method for expanding a field-of-view of a volumetric computed tomography scan comprises identifying truncated views having projection truncation and non-truncated views without projection truncation based on an average value of one or more edge channels. An estimated missing projection is calculated for each of the truncated views based on at least one neighboring non-truncated view. A projection profile is calculated for each of the truncated views based on the estimated missing projection, and the projection profile provides at least one of attenuation data and projection data for an area outside a field-of-view.

    摘要翻译： 用于扩展体积计算机断层摄影扫描的视野的方法包括基于一个或多个边缘通道的平均值来识别具有投影截断和非截断视图的截断视图而不进行投影截断。 基于至少一个相邻非截断视图为每个截断的视图计算估计的丢失投影。 基于估计的丢失投影，针对每个截断的视图计算投影轮廓，并且投影轮廓提供用于视场外的区域的衰减数据和投影数据中的至少一个。

    Methods and apparatus for 3D reconstruction in helical cone beam volumetric CT
    96.
    发明授权
    Methods and apparatus for 3D reconstruction in helical cone beam volumetric CT 有权
    螺旋锥体体积CT三维重建方法与装置

    公开(公告)号：US07173996B2

    公开(公告)日：2007-02-06

    申请号：US10892931

    申请日：2004-07-16

    申请人： Xiangyang Tang ,  Jiang Hsieh ,  Roy Arnulf Helge Nilsen

    发明人： Xiangyang Tang ,  Jiang Hsieh ,  Roy Arnulf Helge Nilsen

    IPC分类号： G01N23/00

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

    摘要： A method for reconstructing an image of an object utilizing a cone-beam volumetric computed tomographic imaging apparatus includes helically scanning the object with a radiation source utilizing the cone-beam volumetric computed tomographic imaging apparatus; selecting radiation beams emitted by the radiation source passing through a pixel P having a smallest cone angle in comparison with that of the conjugate rays of the radiation beam; and reconstructing an image of the object utilizing projection data obtained from the selected radiation beams while avoiding the use of redundant projection data from unselected conjugate rays of the selected radiation beams.

    摘要翻译： 使用锥束体积计算机断层成像装置重建物体的图像的方法包括利用锥束体积计算机断层摄影装置用辐射源螺旋扫描物体; 选择辐射源发射的辐射束，其通过与辐射束的共轭射线相比具有最小锥角的像素P; 以及使用从所选择的辐射束获得的投影数据来重建物体的图像，同时避免使用来自所选择的辐射束的未选择的共轭射线的冗余投影数据。