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。

公开(公告)号：US06285732B1

公开(公告)日：2001-09-04

申请号：US09440733

申请日：1999-11-16

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  A61B6/027 ,  Y10S378/901

摘要： In one aspect, the present invention is a method for computerized tomographic (CT) imaging of an object, the method including steps of scanning an object with a CT imaging system to acquire views including projection samples of an object; interpolating the views nonuniformly within a selected view range to produce nonuniformly interpolated views; weighting the views, including weighting the acquired views and the nonuniformly interpolated views, to compensate for the nonuniform interpolation; and filtering and backprojecting the views to generate an image of the object. Improved CT imaging is thus provided by reducing view aliasing artifacts without simultaneously reducing spatial resolution to clinically unacceptable levels.

摘要翻译： 一方面，本发明是一种用于物体的计算机断层摄影（CT）成像的方法，所述方法包括以下步骤：用CT成像系统扫描物体以获取包括物体的投影样本的视图; 在所选择的视图范围内非均匀地内插视图以产生不均匀的内插视图; 对视图进行加权，包括对所获取的视图和不均匀内插视图进行加权，以补偿不均匀插值; 并且过滤和反投影视图以生成对象的图像。因此，通过减少视图别名伪像而不同时将空间分辨率降低到临床上不可接受的水平来提供改进的CT成像。

公开(公告)号：US06278767B1

公开(公告)日：2001-08-21

申请号：US09301032

申请日：1999-04-28

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B604

CPC分类号： G01N23/046 ,  A61B5/055 ,  A61B6/032 ,  A61B6/4085 ,  G01B15/00 ,  G01N2223/419

摘要： The present invention, in one form, is an imaging system for accurately determining a length of an object of interest (OOI). Particularly and in one embodiment, the OOI has a curvature in a direction non-parallel to a projection plane. Initially, after utilizing MIP images to identify the OOI, boundaries and a center of the OOI are determined for each image. Utilizing the determined boundaries and center, an OOI length is determined. Specifically, the OOI length is determined by determining a distance between each adjacent image and then summing the resulting values. The distance is then displayed on the MIP images by either distance indicators or numerical display.

摘要翻译： 本发明以一种形式是用于精确地确定感兴趣对象（OOI）的长度的成像系统。 特别地，在一个实施例中，OOI在不平行于投影平面的方向上具有曲率。 最初，在利用MIP图像来识别OOI之后，为每个图像确定OOI的边界和中心。 利用确定的边界和中心，确定OOI长度。 具体地，通过确定每个相邻图像之间的距离，然后对所得到的值求和来确定OOI长度。 然后通过距离指示器或数字显示在MIP图像上显示距离。

公开(公告)号：US06269139B1

公开(公告)日：2001-07-31

申请号：US09390449

申请日：1999-09-07

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： A61B603

CPC分类号： G06T11/005 ,  G06T2211/432 ,  Y10S378/901

摘要： Methods and apparatus for weighting data collected in a computed tomography scan using a digital flat panel are described. In one embodiment, the method includes the steps of selecting a weighting function in which (a) a sum of weights of complementary samples equals unity, the weighting function is continuous and differentiable along &ggr; where &ggr; is the fan angle, the weighting function approaches zero near an edge of the panel and approaches unity near a panel boundary, and the weighting function remains constant for a range &xgr;1

摘要翻译： 描述了使用数字平板在计算机断层摄影扫描中收集的加权数据的方法和装置。 在一个实施例中，该方法包括以下步骤：选择加权函数，其中（a）互补样本的权重之和等于1，加权函数沿伽马是γ连续和可微分，其中γ是扇角，加权函数接近零 靠近面板的边缘并在面板边界附近接近单位，并且加权函数对于范围＆xgr; 1 <＆xgr; <＆xgr; 2，其中＆xgr; 1和＆xgr; 2基于最终相交点确定 在重建视野内的免费射线。

公开(公告)号：US06256368B1

公开(公告)日：2001-07-03

申请号：US09419191

申请日：1999-10-15

申请人： Jiang Hsieh ,  Mark Woodford

发明人： Jiang Hsieh ,  Mark Woodford

IPC分类号： G01N2300

CPC分类号： A61B6/488 ,  A61B6/032 ,  A61B6/503 ,  A61B6/541

摘要： In one aspect, the present invention is a method for producing CT images of a patient's heart suitable for calcification scoring, in which the heart has a cardiac cycle. The method includes steps of acquiring data representative of a first scout-scanned CT image of physical locations of the patient's body including at least a portion of the patient's heart at phases &phgr;1(L) of the cardiac cycle, acquiring data representative of a second scout-scanned CT image of the physical locations of the patient's body including at least a portion of the patient's heart at phases &phgr;2(L) of the cardiac cycle different from &phgr;1(L) at physical positions L of interest, and determining a difference image from the acquired data representative of the first scout-scanned CT image and the acquired data representative of the second scout-scanned CT image data. It is not necessary that &phgr;1(L) and &phgr;2(L) be constant as a function of position L.

摘要翻译： 一方面，本发明是一种用于产生适于钙化评分的患者心脏的CT图像的方法，其中心脏具有心动周期。 该方法包括以下步骤：获取表示患者身体的物理位置的第一侦察扫描CT图像的数据的步骤，该数据包括心动周期相位ph1（L）处的患者心脏的至少一部分，获取表示第二侦察器 包括患者心脏的物理位置的扫描CT图像，其包括在感兴趣的物理位置L处与心脏周期不同于phi1（L）的相位phi2（L）处的患者心脏的至少一部分，并且确定来自 代表第一侦察扫描CT图像的获取数据和表示第二侦察扫描CT图像数据的获取数据。 作为位置L的函数，phi1（L）和phi2（L）不是必须的。

公开(公告)号：US06226350B1

公开(公告)日：2001-05-01

申请号：US09261778

申请日：1999-03-03

申请人： Jiang Hsieh

发明人： Jiang Hsieh

IPC分类号： H05G100

CPC分类号： A61B6/541 ,  A61B5/0456 ,  A61B6/032

摘要： The present invention, in one form, includes an imaging system having a x-ray source and detector array and a reconstruction algorithm. The algorithm removes overlapping structures from a patient scan so that enhanced images representing a moving heart are generated. More specifically and in one embodiment, an estimated background representing the overlapping structures is determined using the projection data. The estimated background is then subtracted from the projection data to generate filtered data. The filtered data is then used to generate an enhanced image so that cardiac calcification may be identified.

摘要翻译： 本发明在一种形式中包括具有x射线源和检测器阵列和重建算法的成像系统。 该算法从患者扫描中移除重叠结构，从而生成表示移动心脏的增强图像。 更具体地，在一个实施例中，使用投影数据确定表示重叠结构的估计背景。 然后从投影数据中减去估计的背景以产生滤波数据。 然后将经滤波的数据用于产生增强图像，使得可以识别心脏钙化。

公开(公告)号：US6038278A

公开(公告)日：2000-03-14

申请号：US108676

申请日：1998-07-01

申请人： Jiang Hsieh ,  Kishore Acharya ,  Sandeep Dutta

发明人： Jiang Hsieh ,  Kishore Acharya ,  Sandeep Dutta

IPC分类号： A61B6/03 ,  G06T1/00 ,  G06T11/00

CPC分类号： A61B6/032 ,  A61B6/4085 ,  G06T11/005

摘要： The present invention, in one form, is a system for performing image reconstruction from projection data acquired in a helical scan. More specifically, the system implements an incremental reconstruction algorithm for helical scan projection data which does not require filtering, weighting and backprojecting such projection data for generating each image. Particularly, a segmentation algorithm divides the projection into a plurality of segments so that subsequent images are generated by generating image data only for those segments that have changed from the base image.

摘要翻译： 本发明以一种形式是用于从螺旋扫描中获取的投影数据执行图像重建的系统。 更具体地，该系统对螺旋扫描投影数据实施增量重建算法，该算法不需要滤波，加权和反投影这种用于生成每个图像的投影数据。 特别地，分割算法将投影分成多个段，使得仅通过从基本图像改变的那些段生成图像数据来生成后续图像。