公开(公告)号：US20050074085A1

公开(公告)日：2005-04-07

申请号：US10680688

申请日：2003-10-07

申请人： Jiang Hsieh ,  Eugene Williams ,  Thomas Toth

发明人： Jiang Hsieh ,  Eugene Williams ,  Thomas Toth

IPC分类号： A61B5/055 ,  A61B6/03 ,  G01N23/04 ,  G06T1/00 ,  G21K1/12 ,  A61B6/00 ,  G01N23/00 ,  H05G1/60

CPC分类号： A61B6/032 ,  A61B5/055 ,  A61B6/027 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612 ,  Y10S378/901

摘要： Some configurations of the present invention thus provide a method for producing images of an object. The method includes dynamically helically scanning an object on a moving table utilizing a scanning imaging system. During the scan, projection views of the object are acquired and stored together with corresponding table locations. A plane for reconstruction of an image of the object is selected. The stored table locations are used to determine geometric variables applicable to the stored projection views; and the stored projection views are filtered and backprojected utilizing the geometrical variables to reconstruct an image of the object at the reconstruction plane.

摘要翻译： 因此，本发明的一些结构提供了一种用于产生物体的图像的方法。 该方法包括利用扫描成像系统动态地螺旋扫描移动台上的物体。 在扫描期间，获取对象的投影视图并与对应的表位置一起存储。 选择用于重建对象的图像的平面。 存储的表位置用于确定适用于存储的投影视图的几何变量; 并且利用几何变量对所存储的投影视图进行滤波和反投影，以重构在重构平面处的对象的图像。

公开(公告)号：US20050063513A1

公开(公告)日：2005-03-24

申请号：US10668444

申请日：2003-09-23

申请人： Jiang Hsieh ,  Eugene Williams

发明人： Jiang Hsieh ,  Eugene Williams

IPC分类号： A61B6/03 ,  H04N5/32 ,  H05G1/64

CPC分类号： H04N5/3675 ,  A61B6/032 ,  A61B6/585 ,  A61B6/586 ,  H04N5/32

摘要： A method and system for an improved data acquisition system with an image detector array and an image processing system which finds a malfunctioning cell, interpolates a signal for the malfunctioning cell using neighboring channels of the cell, and corrects the interpolation with an error rate found in performing interpolations on neighboring rows with cells which are not malfunctioning. The image processing system may include a DAS and a reconstruction system. The step of finding a malfunctioning cell may be accomplished through a variety of methods, such as measuring discrepancies between a cell's and its neighboring cell's average readings over time and exposing the cells to x-rays which should produce similar readings in all the cells and comparing the cells' signals, looking for discrepancies. The step of interpolating and the step of correcting may take into consideration cells within the same projection view as the malfunctioning cell.

摘要翻译： 一种用于具有图像检测器阵列和图像处理系统的改进的数据采集系统的方法和系统，其发现故障小区，使用所述小区的相邻信道内插用于所述故障小区的信号，并以所述小区的相邻信道校正所述插值 在没有故障的单元对相邻行执行内插。 图像处理系统可以包括DAS和重建系统。 找到故障细胞的步骤可以通过各种方法来实现，例如测量细胞及其相邻细胞的平均读数随时间的差异，并将细胞暴露于在所有细胞中产生相似读数的x射线，并比较 细胞信号，寻找差异。 内插步骤和校正步骤可以考虑到与故障单元相同的投影视图中的单元。

公开(公告)号：US20050047551A1

公开(公告)日：2005-03-03

申请号：US10604956

申请日：2003-08-28

申请人： Fang Dong ,  Jiang Hsieh ,  Bruce Dunham ,  Clarence Gordon

发明人： Fang Dong ,  Jiang Hsieh ,  Bruce Dunham ,  Clarence Gordon

IPC分类号： A61B6/03 ,  G01D18/00 ,  H05G1/00 ,  H05G1/26

CPC分类号： H05G1/265 ,  A61B6/03

摘要： The present invention provides a method to detect tube spits and to reduce spit related artifacts in a computed tomography imaging system. A way of detecting tube spit is to monitor the generator kilovolt or milliamp waveforms. Changes in kV waveform follow closely with those in offset-corrected projection data. If a tube-spit event is not detected, processing proceeds without tube spit correction. If a tube-spit event is detected, a tube spit correction is performed. The objective of tube-spit correction is to remove image artifacts due to the occurrence of a tube-spit event.

摘要翻译： 本发明提供了一种在计算机断层成像系统中检测管唾液并减少呕吐相关赝像的方法。 检测管唾液的一种方法是监测发生器千伏或毫安波形。 kV波形的变化与偏移校正投影数据中的变化密切相关。 如果没有检测到管痰事件，则处理过程不进行管口修复。 如果检测到管痰事件，则执行管痰修正。 管道修正的目的是消除由于管it事件的发生引起的图像伪影。

公开(公告)号：US06768782B1

公开(公告)日：2004-07-27

申请号：US10319689

申请日：2002-12-16

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

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

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/4085 ,  A61B6/469 ,  Y10S378/901

摘要： An imaging system is provided including a source generating an x-ray beam and a detector array receiving the x-ray beam and generating projection data corresponding to at least a scanned portion of an object. An image reconstructor is electrically coupled to said detector array and reconstructs an image of the scanned portion of the object for a full field-of-view in response to said projection data using a dual iterative reconstruction technique. The dual iterative reconstruction technique includes reconstructing the full field-of-view using a first resolution and reconstructing a region-of-interest within the full FOV using a second resolution. A method is also provided for reconstructing an image using projection data from such an imaging system.

摘要翻译： 提供了一种成像系统，包括产生x射线束的源和接收x射线束的检测器阵列，并且产生与至少对象的扫描部分对应的投影数据。 图像重构器电耦合到所述检测器阵列，并且使用双重迭代重建技术来响应于所述投影数据重建对象的扫描部分的图像以获得完整的视野。 双重迭代重建技术包括使用第一分辨率重构全视野并且使用第二分辨率来重构全FOV内的感兴趣区域。 还提供了一种用于使用来自这种成像系统的投影数据来重建图像的方法。

公开(公告)号：US06647084B1

公开(公告)日：2003-11-11

申请号：US10065692

申请日：2002-11-11

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B603

CPC分类号： A61B6/032 ,  A61B6/027 ,  A61B6/583 ,  G06T11/005

摘要： A method for filtering projection data of a helical scan of an object includes acquiring projection data representing a helical scan of an object, generating a weighting function based on the acquired projection data, determining a scaling function for the weighting function, and determining a row-filtered weighting function based on the weighting function and scaling function.

摘要翻译： 用于过滤对象的螺旋扫描的投影数据的方法包括获取表示对象的螺旋扫描的投影数据，基于获取的投影数据生成加权函数，确定加权函数的缩放函数， 基于加权函数和缩放函数的滤波加权函数。

公开(公告)号：US06529576B2

公开(公告)日：2003-03-04

申请号：US09897173

申请日：2001-06-29

申请人： Jiang Hsieh ,  Kishore C. Acharya

发明人： Jiang Hsieh ,  Kishore C. Acharya

IPC分类号： A61B603

CPC分类号： G06T11/006 ,  A61B6/027

摘要： One aspect of the present invention is a method that includes helically scanning an object at a selected helical pitch to acquire projection data of the object. The acquired projection data includes conjugate samples from single rows of the detector array of the CT imaging system and interrow samples. Projections in a plane of reconstruction (POR) are estimated based upon a selection of the projection data from the group consisting of the conjugate samples from at least one of the single rows, the interrow samples, and combinations thereof, the selection dependent upon the selected helical pitch. The estimated projections are filtered and backprojected to reconstruct at least one image of the object.

摘要翻译： 本发明的一个方面是一种方法，其包括以选定的螺旋间距螺旋扫描物体以获取物体的投影数据。 所获取的投影数据包括来自CT成像系统的检测器阵列的单行和中间样本的共轭样本。 基于从由单行，中间样本及其组合中的至少一个组成的组的投影数据的选择来估计重建平面（POR）中的投影，所述选择取决于所选择的 螺距。 估计的投影被过滤和反向投影以重建对象的至少一个图像。

公开(公告)号：US06493646B1

公开(公告)日：2002-12-10

申请号：US09505590

申请日：2000-02-16

申请人： Jiang Hsieh ,  O. Erdogan Gurmen

发明人： Jiang Hsieh ,  O. Erdogan Gurmen

IPC分类号： G06F1900

CPC分类号： G01N23/046 ,  A61B6/583 ,  G01N2223/419 ,  G01T1/17

摘要： Degradation in reconstructed medical images is reduced by a method for calibrating a primary decay correction for a radiation detector having a decay curve that can be characterized by a plurality of components having different time constants. The method includes steps of: fitting the decay curve to a sum of a plurality of weighted exponentials having a first set of time constants; applying a correction to a measured response of the detector using a sum of the plurality of weighted exponentials having the first set of time constants to obtain a corrected response; selecting at least one additional exponential time constant dependent upon the corrected response; and fitting the decay curve to a sum of a second plurality of weighted exponentials including the first plurality of time constants and the at least one additional exponential time constant.

摘要翻译： 通过用于校准具有可以由具有不同时间常数的多个分量表征的衰减曲线的辐射检测器的主衰减校正的方法来减少重建的医学图像中的退化。 该方法包括以下步骤：将衰减曲线拟合为具有第一组时间常数的多个加权指数的和; 使用具有第一组时间常数的多个加权指数的和来对检测器的测量响应应用校正以获得校正的响应; 根据校正的响应选择至少一个附加指数时间常数; 以及将所述衰减曲线拟合到包括所述第一多个时间常数和所述至少一个附加指数时间常数的第二多个加权指数的和。

公开(公告)号：US06421412B1

公开(公告)日：2002-07-16

申请号：US09379384

申请日：1999-08-23

申请人： Jiang Hsieh ,  Robert F. Senzig

发明人： Jiang Hsieh ,  Robert F. Senzig

IPC分类号： G01N2300

CPC分类号： A61B6/032 ,  A61B6/4014 ,  A61B6/4028 ,  A61B6/488 ,  A61B6/503

摘要： The present invention, in one form, is an imaging system for generating images of an entire heart. In one embodiment, projection data is collected for a field of view containing only the heart so that the total detector size is reduced. The smaller detector allows the use of a plurality of source-detector pairs so that projection data for an angular coverage of (&pgr;+fan angle) is collected by rotating a gantry significantly less than one complete rotation. Therefore, projection data is collected in significantly less than one cardiac cycle, minimizing motion artifacts.

摘要翻译： 本发明以一种形式是用于产生整个心脏的图像的成像系统。 在一个实施例中，针对仅包含心脏的视野收集投影数据，使得总检测器尺寸减小。 较小的检测器允许使用多个源 - 检测器对，使得通过旋转显着小于一个完整旋转的台架来收集（pi +风扇角度）的角度覆盖的投影数据。 因此，以显着小于一个心动周期收集投影数据，最小化运动伪像。

公开(公告)号：US06381297B1

公开(公告)日：2002-04-30

申请号：US09639368

申请日：2000-08-15

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B603

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

摘要： One embodiment of the present invention is a method for generating an image of an object using a multislice computed tomography imaging system. The method includes steps of: helically scanning an object with a multislice computed tomography imaging system to acquire projection data; determining a set of conjugate samples of the projection data that formulate a set of parallel projections; and reconstructing a set of images of the object using the conjugate samples. By determining a set of conjugate samples that formulate a set of parallel projections, embodiments of the present invention make possible reconstruction of images from projection data scanned at 8:1 pitch or higher.

摘要翻译： 本发明的一个实施例是使用多层计算机断层摄影成像系统来生成对象的图像的方法。 该方法包括以下步骤：用多层计算机断层摄影系统螺旋扫描物体以获取投影数据; 确定制定一组平行投影的投影数据的一组共轭样本; 以及使用共轭样本重建对象的一组图像。 通过确定制定一组平行投影的一组共轭样本，本发明的实施例使得可以以8：1间距或更高扫描的投影数据重建图像。

公开(公告)号：US06370217B1

公开(公告)日：2002-04-09

申请号：US09307400

申请日：1999-05-07

申请人： Hui Hu ,  Jiang Hsieh ,  Stanley H. Fox ,  Kishore C. Acharya ,  Hui David He ,  Yi Sun

发明人： Hui Hu ,  Jiang Hsieh ,  Stanley H. Fox ,  Kishore C. Acharya ,  Hui David He ,  Yi Sun

IPC分类号： A61B600

CPC分类号： A61B6/541 ,  A61B6/027 ,  G01N23/046 ,  G01N2223/419 ,  G01N2223/612

摘要： The present invention, in one form is an imaging system for generating images of an entire object. In one embodiment, a physiological cycle unit is used to determine the cycle of the moving object. By altering the rotational speed of an x-ray source as a function of the object cycle, segments of projection data are collected for each selected phase of the object during each rotation. After completing a plurality of rotations, the segments of projection data are combined and a cross-sectional image of the selected phase of the object is generated. As a result, minimizing motion artifacts.

摘要翻译： 本发明的一种形式是用于产生整个对象的图像的成像系统。 在一个实施例中，使用生理循环单元来确定移动物体的周期。 通过改变作为对象周期的函数的x射线源的旋转速度，在每个旋转期间针对对象的每个选定阶段收集投影数据的段。 在完成多个旋转之后，组合投影数据的段，并且生成对象的选定阶段的横截面图像。 结果，最小化运动伪像。