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47 条记录 (耗时 0.014 秒)

    ADAPTIVE GRADIENT WEIGHTING TECHNIQUE FOR DETECTOR BAD CELL CORRECTION
    41.
    发明申请
    ADAPTIVE GRADIENT WEIGHTING TECHNIQUE FOR DETECTOR BAD CELL CORRECTION 有权
    用于检测器BAD细胞校正的自适应梯度称重技术

    公开(公告)号：US20080226032A1

    公开(公告)日：2008-09-18

    申请号：US11687410

    申请日：2007-03-16

    申请人： Baojun Li ,  Jiang Hsieh

    发明人： Baojun Li ,  Jiang Hsieh

    IPC分类号： H01J35/00

    CPC分类号： G01T1/2985

    摘要： An imaging system includes a two-dimensional detector having a plurality of cells wherein each cell is configured to detect energy or signal passing through an object. The imaging system includes a computer programmed to acquire imaging data for the plurality of cells, identify a cell to be corrected, based on the imaging data, interpolate Ix and Iy for the identified cell based on neighbor cells, and calculate local gradients gx and gy between the identified cell and its neighbor cells based on the interpolation. The computer is further programmed to calculate weighting factors wx and wy based on the local gradients, calculate a corrected final value I(0,0) for the identified cell, and correct the identified cell with the corrected final value.

    摘要翻译： 成像系统包括具有多个单元的二维检测器，其中每个单元被配置为检测通过物体的能量或信号。 成像系统包括被编程为获取多个单元的成像数据的计算机，基于成像数据来识别要校正的单元，插入I X和I Y 对于基于相邻小区的所识别的小区，并且基于所述插值来计算所识别的小区与其相邻小区之间的本地梯度g x1和g y y y。 计算机进一步被编程为基于局部梯度来计算加权因子w x x和w y y，计算所识别的单元的校正后的最终值I（0,0） 并用校正的最终值校正所识别的单元。

    A METHOD AND SYSTEM FOR REDUCING ARTIFACTS IN A TOMOSYNTHESIS IMAGING SYSTEM
    44.
    发明申请
    A METHOD AND SYSTEM FOR REDUCING ARTIFACTS IN A TOMOSYNTHESIS IMAGING SYSTEM 审中-公开
    一种用于减少TOMOSYNTHESIS成像系统中的ARTIFACTS的方法和系统

    公开(公告)号：US20080008372A1

    公开(公告)日：2008-01-10

    申请号：US11456183

    申请日：2006-07-07

    申请人： Baojun Li ,  Xianfeng Ni ,  Kadri Nizar Jabri

    发明人： Baojun Li ,  Xianfeng Ni ,  Kadri Nizar Jabri

    IPC分类号： G06K9/00 ,  G06K9/40

    CPC分类号： G06T11/006 ,  G06T2207/20104 ,  G06T2211/421

    摘要： The present invention provides a method and system for reducing artifacts in tomosynthesis reconstructed images. The artifacts reduction method comprises back-projecting only a part of the projection image. The method includes acquiring plurality of projection images from different projection angles. It further includes identifying an area of interest of each projection image based on a predefined area and back project the area of interest of each projection image to reconstruct at least one three dimensional image. In an embodiment the area of interest of the projection image is identified based on field of view of the collimator. In another embodiment the invention provides a tomosynthesis system producing a 3-D image with reduced reducing artifacts.

    摘要翻译： 本发明提供了一种减少断层重构图像中伪像的方法和系统。 人造物减少方法包括仅投影投影图像的一部分。 该方法包括从不同的投影角度获取多个投影图像。 它还包括基于预定义区域识别每个投影图像的感兴趣区域，并且再次投影每个投影图像的感兴趣区域以重建至少一个三维图像。 在一个实施例中，基于准直器的视野来识别投影图像的感兴趣区域。 在另一个实施方案中，本发明提供了一种产生具有降低的减少伪影的3-D图像的断层合成系统。

    Systems, methods and apparatus for filtered back-projection reconstruction in digital tomosynthesis
    45.
    发明申请
    Systems, methods and apparatus for filtered back-projection reconstruction in digital tomosynthesis 有权
    用于数字断层合成过滤反投影重建的系统，方法和装置

    公开(公告)号：US20060204076A1

    公开(公告)日：2006-09-14

    申请号：US11069308

    申请日：2005-03-01

    申请人： Gopal Avinash ,  Baojun Li ,  Renuka Uppaluri

    发明人： Gopal Avinash ,  Baojun Li ,  Renuka Uppaluri

    IPC分类号： G06K9/00 ,  G01C3/14 ,  H04N13/00 ,  G06K9/36 ,  G06T15/00

    CPC分类号： G06T11/006 ,  G06T11/005 ,  G06T11/008 ,  G06T2211/421 ,  G06T2211/436 ,  Y10S128/922

    摘要： Systems, methods and apparatus are provided through which a specialized back-projection process reconstructs a finely detailed and crisp three-dimensional image (3-D ) from a series of two-dimensional (2-D) images by pre-filtering the 2-D images with a first group of settings before back-projecting the 2-D images into a 3-D image, and then post-filtering the 3-D image with another group of settings. In some embodiments, the first group of settings and the second group of settings are synergistically optimized in relation to each other to provide emphasis on a structure of interest in the object.

    摘要翻译： 提供了系统，方法和装置，通过该系统，方法和装置，专门的反投影过程通过对2维（2-D）图像进行预过滤来重建来自一系列二维（2-D）图像的精细细节和清晰的三维图像（3-D） D图像具有第一组设置，然后将2-D图像反投影到3 -D图像中，然后用另一组设置对3 -D图像进行后置滤波。 在一些实施例中，第一组设置和第二组设置协同地相互优化以提供对对象中感兴趣的结构的强调。

    Method and apparatus for tomosynthesis image quality control
    46.
    发明申请
    Method and apparatus for tomosynthesis image quality control 失效
    断层摄影图像质量控制的方法和装置

    公开(公告)号：US20060120506A1

    公开(公告)日：2006-06-08

    申请号：US11339067

    申请日：2006-01-25

    申请人： Baojun Li ,  Rowland Saunders ,  John Sandrik ,  Xianfeng Ni

    发明人： Baojun Li ,  Rowland Saunders ,  John Sandrik ,  Xianfeng Ni

    IPC分类号： H05G1/60 ,  A61B6/00 ,  G01N23/00 ,  G21K1/12

    CPC分类号： A61B6/583 ,  A61B6/025 ,  G06T11/005 ,  G06T2211/436

    摘要： The present invention provides a method and apparatus for tomosynthesis image quality control for a tomosynthesis imaging system, the method and apparatus addressing the measurement of in-plane resolution and slice thickness, via the measurement of modulation transfer function (MTF), the method and apparatus including: positioning a phantom having an edge of predetermined sharpness at a predetermined angle relative to an imaging plane of an x-ray detector; performing tomosynthesis acquisition and generating one or more slice images using one or more three-dimensional reconstruction algorithms; selecting a slice image to be measured from the one or more slice images; identifying a sharpest edge in the slice image to be measured, wherein the sharpest edge in the slice image to be measured includes the in-focus portion of the phantom; inputting the slice image to be measured and coordinates of the sharpest edge in the slice image to be measured into an MTF algorithm; and, using the MTF algorithm, calculating the in-plane resolution and slice thickness of the slice image to be measured.

    摘要翻译： 本发明提供了通过调制传递函数（MTF）的测量，方法和装置，用于层析合成成像系统的层析合成图像质量控制的方法和装置，该方法和装置解决了平面内分辨率和切片厚度的测量。 包括：相对于X射线检测器的成像平面将具有预定锐度的边缘的假想物以预定角度定位; 执行层析合成获取并使用一个或多个三维重建算法生成一个或多个切片图像; 从所述一个或多个切片图像中选择要测量的切片图像; 识别要测量的切片图像中的最锐边，其中要测量的切片图像中的最锐边包括体模的对焦部分; 将要测量的切片图像和要测量的切片图像中最锐边的坐标输入到MTF算法中; 并使用MTF算法计算要测量的切片图像的面内分辨率和切片厚度。