公开(公告)号：US07286631B2

公开(公告)日：2007-10-23

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： A61B6/00

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

摘要： A method and apparatus for tomosynthesis image quality control for a tomosynthesis imaging system. 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 a modulation transfer function (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： 一种用于断层合成成像系统的层析合成图像质量控制的方法和装置。 所述方法和装置包括：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体以预定角度定位; 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调制传递函数（MTF）算法; 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。

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。

公开(公告)号：US20060215809A1

公开(公告)日：2006-09-28

申请号：US11088019

申请日：2005-03-22

申请人： Xianfeng Ni ,  Baojun Li ,  Xu Zhang

发明人： Xianfeng Ni ,  Baojun Li ,  Xu Zhang

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

CPC分类号： A61B6/025 ,  G01N23/044 ,  G01N2223/419

摘要： Certain embodiments of the present invention include methods and systems for improved motion and angulation profiles in tomosynthesis. A method includes designating a target with a first and second dimension. An x-ray beam is projected onto at least a portion of the target. The x-ray beam has an origin with a position along the first dimension. The x-ray beam also has a beam axis, a projection area, and an angle ∅ representative of an angular distance between the beam axis and the at least a portion of the target. The method further includes varying the angle ∅ based at least in part on the position of the origin along the first dimension. The angle ∅ is varied to substantially maintain the projection area.

摘要翻译： 本发明的某些实施方案包括用于在层析合成中改善运动和角度分布的方法和系统。 一种方法包括用第一和第二维度指定目标。 X射线束投射到目标的至少一部分上。 X射线束具有沿着第一维度的位置的原点。 X射线束还具有光束轴，投影区域和角度ø，其代表光束轴线和目标物体的至少一部分之间的角距离。 该方法还包括至少部分地基于原点沿着第一维度的位置改变角度ø。 角度ø变化以基本上保持投影面积。

公开(公告)号：US07515682B2

公开(公告)日：2009-04-07

申请号：US11345918

申请日：2006-02-02

申请人： Baojun Li ,  Stephen W. Metz ,  Jiang Hsieh ,  Yogesh Srinivas ,  Xianfeng Ni ,  Tabb Patz

发明人： Baojun Li ,  Stephen W. Metz ,  Jiang Hsieh ,  Yogesh Srinivas ,  Xianfeng Ni ,  Tabb Patz

IPC分类号： A61B6/03

CPC分类号： A61B6/465 ,  A61B6/025

摘要： A method for creating a variable slice thickness for displaying an imaged object is disclosed. The method includes acquiring a plurality of projection images from a plurality of different projection angles within a defined sweep angle, reconstructing a plurality of object images from the plurality of projection images, each object image having a first slice thickness, and applying a function rule to combine images, whole images or portions thereof or attributes thereof, of the plurality of projection images, of the plurality of object images, or of both, thereby providing for the display of the object utilizing a second slice thickness that varies from the first slice thickness.

摘要翻译： 公开了一种用于创建用于显示成像对象的可变切片厚度的方法。 该方法包括从定义的扫描角度内的多个不同投影角度获取多个投影图像，从多个投影图像重构多个对象图像，每个对象图像具有第一切片厚度，并将功能规则应用于 组合多个投影图像中的多个对象图像或两者的图像，整个图像或其部分或其属性，从而利用从第一切片厚度变化的第二切片厚度来提供对象的显示 。

公开(公告)号：US20070183564A1

公开(公告)日：2007-08-09

申请号：US11345918

申请日：2006-02-02

申请人： Baojun Li ,  Stephen Metz ,  Jiang Hsieh ,  Yogesh Srinivas ,  Xianfeng Ni ,  Tabb Patz

发明人： Baojun Li ,  Stephen Metz ,  Jiang Hsieh ,  Yogesh Srinivas ,  Xianfeng Ni ,  Tabb Patz

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

CPC分类号： A61B6/465 ,  A61B6/025

摘要： A method for creating a variable slice thickness for displaying an imaged object is disclosed. The method includes acquiring a plurality of projection images from a plurality of different projection angles within a defined sweep angle, reconstructing a plurality of object images from the plurality of projection images, each object image having a first slice thickness, and applying a function rule to combine images, whole images or portions thereof or attributes thereof, of the plurality of projection images, of the plurality of object images, or of both, thereby providing for the display of the object utilizing a second slice thickness that varies from the first slice thickness.

摘要翻译： 公开了一种用于创建用于显示成像对象的可变切片厚度的方法。 该方法包括从定义的扫描角度内的多个不同投影角度获取多个投影图像，从多个投影图像重构多个对象图像，每个对象图像具有第一切片厚度，并将功能规则应用于 组合多个投影图像中的多个对象图像或两者的图像，整个图像或其部分或其属性，从而利用从第一切片厚度变化的第二切片厚度来提供对象的显示 。

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。

公开(公告)号：US20070110212A1

公开(公告)日：2007-05-17

申请号：US11280151

申请日：2005-11-16

申请人： Baojun Li ,  Renuka Uppaluri ,  Carson Thomas ,  Gerald Schulte ,  Gopal Avinash ,  Rowland Saunders ,  Tammy Merisotis

发明人： Baojun Li ,  Renuka Uppaluri ,  Carson Thomas ,  Gerald Schulte ,  Gopal Avinash ,  Rowland Saunders ,  Tammy Merisotis

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

CPC分类号： A61B6/025 ,  A61B6/4291 ,  G01N23/044 ,  G01N2223/419 ,  G01N2223/612

摘要： The presently described technology provides a tomosynthesis imaging system that comprises an x-ray tube and an anti-scatter grid. The x-ray tube is configured to emit x-rays from a plurality of positions during movement of the x-ray tube along a long axis of a mobile patient surface. The anti-scatter grid is configured to filter out scattered x-rays and includes a grid line parallel to the long axis of the mobile patient surface. The x-rays emitted from the plurality of positions are reconstructed into at least one image of at least one plane of a patient anatomy. The described technology is useful in emergency or trauma applications where a patient may be quickly and easily moved on a mobile patient surface to a position near an x-ray detector used in combination with the x-ray tube and anti-scatter grid.

摘要翻译： 目前描述的技术提供了一种包含X射线管和防散射栅格的断层融合成像系统。 X射线管被配置为在X射线管沿着移动患者表面的长轴移动期间从多个位置发射X射线。 防散射网格被配置为过滤散射的X射线，并且包括平行于移动患者表面的长轴的网格线。 从多个位置发射的x射线被重建成患者解剖结构的至少一个平面的至少一个图像。 所描述的技术在紧急或创伤应用中是有用的，其中患者可以快速且容易地在移动患者表面上移动到与x射线管和防散射网格组合使用的x射线检测器附近的位置。

公开(公告)号：US08699811B2

公开(公告)日：2014-04-15

申请号：US13009584

申请日：2011-01-19

申请人： Baojun Li ,  Jiang Hsieh

发明人： Baojun Li ,  Jiang Hsieh

IPC分类号： G06K9/40

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采集多个单元的成像数据的计算机，基于成像数据识别要校正的单元，基于相邻单元对所识别的单元插值Ix和Iy，并计算局部梯度gx和gy 基于内插，在所识别的小区及其相邻小区之间。 计算机还被编程为基于局部梯度计算加权因子wx和wy，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。

公开(公告)号：US20110142314A1

公开(公告)日：2011-06-16

申请号：US12638723

申请日：2009-12-15

申请人： Jiang Hsieh ,  Roy-Arnulf Helge Nilsen ,  Peter Michael Edic ,  Bruno Kristiaan Bernard De Man ,  Jean-Baptiste Thibault ,  Baojun Li ,  John Lawrence Seamans

发明人： Jiang Hsieh ,  Roy-Arnulf Helge Nilsen ,  Peter Michael Edic ,  Bruno Kristiaan Bernard De Man ,  Jean-Baptiste Thibault ,  Baojun Li ,  John Lawrence Seamans

IPC分类号： G06T7/00 ,  G06K9/32

CPC分类号： A61B6/032 ,  A61B6/482 ,  A61B6/503 ,  G06T11/006 ,  G06T2211/412 ,  G06T2211/424

摘要： A system, method, and apparatus includes a computed tomography (CT) system having a rotatable gantry, an x-ray source, a generator, a detector having pixels and positioned to receive x-rays, and a computer. The computer is programmed to acquire CT data representative of an object, determine a first subset of the CT data, determine a second subset of the CT data, and determine a difference between the first and second subsets of the CT data to identify a motion region in the object. The computer is also programmed to update image data reconstructed from a first portion of the first subset of the CT data and corresponding to the region and reconstruct an image based on the updated image data and non-updated image data. The non-updated image data is reconstructed from a second portion the first subset of the CT data.

摘要翻译： 系统，方法和装置包括具有可旋转机架，X射线源，发生器，具有像素并被定位成接收x射线的检测器的计算机断层摄影（CT）系统和计算机。 计算机被编程为获取表示对象的CT数据，确定CT数据的第一子集，确定CT数据的第二子集，并且确定CT数据的第一和第二子集之间的差异，以识别运动区域 在对象中。 计算机还被编程为更新从CT数据的第一子集的第一部分重建并对应于该区域的图像数据，并且基于更新的图像数据和未更新的图像数据重建图像。 从CT数据的第一子集的第二部分重构未更新的图像数据。

公开(公告)号：US07714293B2

公开(公告)日：2010-05-11

申请号：US11620667

申请日：2007-01-06

申请人： Brian Donald Johnston ,  Baojun Li

发明人： Brian Donald Johnston ,  Baojun Li

IPC分类号： H01L27/146

CPC分类号： G01V5/0016

摘要： A method includes mechanically correcting for a keystone effect on an x-ray detector.

摘要翻译： 一种方法包括机械校正对x射线检测器的梯形失真效应。