公开(公告)号：US4905148A

公开(公告)日：1990-02-27

申请号：US228404

申请日：1988-08-04

申请人： Carl R. Crawford

发明人： Carl R. Crawford

IPC分类号： G06T17/00

CPC分类号： G06T17/00 ,  Y10S378/901

摘要： Objects within a three-dimensional tomographic data set which occupy the same portion of the image histogram are separated prior to three-dimensional surface extraction by applying connectivity first to unwanted objects. The unwanted objects thus identified are modified so that they no longer occupy the same portion of the histogram or are flagged. Next, connectivity is applied to the desired objects using a criterion different from the one used on the unwanted objects.

摘要翻译： 在三维断层图像数据集中的占据图像直方图的相同部分的对象在通过首先应用连接到不想要的对象之前在三维表面提取之前被分离。 如此识别的不需要的对象被修改，使得它们不再占据直方图的相同部分或被标记。 接下来，使用与不需要的对象上使用的标准不同的标准将连接应用于期望的对象。

公开(公告)号：US4903202A

公开(公告)日：1990-02-20

申请号：US228891

申请日：1988-08-04

申请人： Carl R. Crawford

发明人： Carl R. Crawford

IPC分类号： G06T17/00

CPC分类号： G06T17/00 ,  Y10S378/901

摘要： Multiple desired objects within a three-dimensional tomographic data set which occupy the same portion of the image histogram with other unwanted objects are separated with reduced reliance on user interaction by applying connectivity to the unwanted objects and setting the voxels to a new value which removes them from the portion of the histogram. Unwanted objects can be identified by examination of the original two-dimensional slices or after examination of a three-dimensional image to excise objects, whereby the invention functions as an electronic scalpel.

摘要翻译： 在与其他不需要的对象占据图像直方图的相同部分的三维断层数据集中的多个所需对象通过对不需要的对象施加连接并将体素设置为新的值来分离，以减少对用户交互的依赖 从直方图的部分。 可以通过检查原始的二维切片或检查三维图像来消除不需要的物体以消除物体，由此本发明用作电子手术刀。

公开(公告)号：US4831528A

公开(公告)日：1989-05-16

申请号：US118628

申请日：1987-11-09

申请人： Carl R. Crawford ,  William E. Lorensen

发明人： Carl R. Crawford ,  William E. Lorensen

IPC分类号： G01N23/04 ,  A61B5/055 ,  A61B6/03 ,  A61B10/00 ,  G06T1/00 ,  G06T17/00

CPC分类号： G06T17/00

摘要： Data in tomographic images is convolved with a low-pass filter to reduce the maximum spatial frequency permitting unique mapping of surface images to a rasterized display. The filter may use linear or other weighting. Re-sampling after the filter is optional. The filtered tomographic data is employed to determine the locations and normal vectors of the surface. The locations and normal vectors employed by a computer graphics processor for applying shading in relation to the angle between the normal vector to a surface element and an operator- defined line of sight to the surface.

公开(公告)号：US4812983A

公开(公告)日：1989-03-14

申请号：US892774

申请日：1986-07-31

申请人： Grant T. Gullberg ,  Carl R. Crawford

发明人： Grant T. Gullberg ,  Carl R. Crawford

IPC分类号： G06T11/00 ,  G06F15/42

CPC分类号： G06T11/006 ,  G06T2211/421 ,  Y10S128/922 ,  Y10S378/901

摘要： Method and means for determining and compensating for a shift in the center of rotation of a fan beam CT reconstruction apparatus. Known reconstruction algorithms for fan beam computed tomography are based on the assumption that the center of rotation of the source or detector is on the midline of the fan. In certain cases due, for example, to machine inaccuracies, the center of rotation can be shifted from the assumed center, and such shift can cause artifacts in the reconstruction. The present invention provides a procedure for estimating the magnitude of the shift and also accommodates for the shift by applying a series of weighting factors to the projection information which are dependent on the magnitude of the shift. The weighted projections are then processed by the usual convolution operation, and the convolved projection sets back projected using a geometry modified to account for the shift. Efficiencies are achieved in that all projection sets can be weighted and convolved before back projection, and existing back projection hardware or software can be used to map the modified projection sets into the pixelized image space.

摘要翻译： 用于确定和补偿扇形束CT重建装置的旋转中心的偏移的方法和装置。 风扇束计算机断层摄影的已知重建算法是基于源或检测器的旋转中心位于风扇中线的假设。 在某些情况下，例如，由于机器不准确，旋转中心可以从假定的中心移位，这种偏移可能会导致重建中的伪像。 本发明提供了一种用于估计移位幅度的过程，并且还通过对依赖于移位幅度的投影信息应用一系列加权因子来适应偏移。 加权投影然后通过通常的卷积运算来处理，并且卷积的投影使用修改的几何来反映投影，以考虑到偏移。 实现效率是，所有投影集可以在反投影之前进行加权和卷积，现有的背投硬件或软件可用于将修改的投影集映射到像素化图像空间中。

公开(公告)号：US4714997A

公开(公告)日：1987-12-22

申请号：US859236

申请日：1986-05-06

申请人： Carl R. Crawford ,  David A. Freundlich

发明人： Carl R. Crawford ,  David A. Freundlich

IPC分类号： G06T11/00 ,  G06F15/42

CPC分类号： G06T11/008 ,  Y10S128/922 ,  Y10S378/901

摘要： Systems and methods are presented for decreasing the processing time of spectral artifact reduction systems that use reprojection data for post reconstruction corrections. The systems and methods essentially reduce the data processed for the reprojection step to reduce the normally relatively long time period required by reprojectors. The time savings have no detrimental effect on image resolution. Thus, better quality pictures are obtained in shorter time periods.

摘要翻译： 提出了系统和方法，用于减少使用重建数据进行后重建校正的光谱伪影减少系统的处理时间。 系统和方法基本上减少了用于重新投射步骤处理的数据，以减少投影机所需的通常相对长的时间段。 节省时间对图像分辨率没有不利影响。 因此，在更短的时间段内获得更好质量的图像。

公开(公告)号：US4570224A

公开(公告)日：1986-02-11

申请号：US445191

申请日：1982-11-29

申请人： Yair Shimoni ,  Zvi Netter ,  Carl R. Crawford

发明人： Yair Shimoni ,  Zvi Netter ,  Carl R. Crawford

IPC分类号： G01N23/04 ,  A61B6/02 ,  A61B6/03 ,  G06T1/00 ,  G06T11/00 ,  G06F15/42 ,  G01T1/29

CPC分类号： G06T11/005 ,  Y10S378/901

摘要： Equipment and methods are presented for rearranging divergent beam derived data into parallel data to enable decreasing the number of preprocessing computations and improving the quality of the resulting tomograph. The equipment and method comprise means and steps which vary the spacing of at least portions of the resulting parallel projections, so that when the parallel projections with varied spacings are combined with the parallel projections that have not had their spacing varied, the cupping artifacts normally present when using projections obtained from rearranging are cancelled.

摘要翻译： 提出了将发散光束导出的数据重新排列成并行数据的设备和方法，以减少预处理计算的数量并提高所得的断层摄影机的质量。 设备和方法包括改变所得到的平行突起的至少部分的间距的装置和步骤，使得当具有不同间距的平行突起与未间隔变化的平行突起组合时，通常呈现拔罐伪影 当使用从重新排列获得的投影被取消时。

公开(公告)号：US08045811B2

公开(公告)日：2011-10-25

申请号：US12352116

申请日：2009-01-12

申请人： Albert W. Wegener ,  Carl R. Crawford ,  Yi Ling

发明人： Albert W. Wegener ,  Carl R. Crawford ,  Yi Ling

IPC分类号： G06K9/36

CPC分类号： G06T9/00 ,  H04N19/15 ,  H04N19/17 ,  H04N19/196

摘要： A computed tomography system has a stationary part, a rotatable part mounted for rotation around an object to be examined and an interface between the stationary part and the rotatable part. The rotatable part includes an x-ray source, a sensor array for detecting x-rays passing through the object to produce projection data samples, a compressor that compresses the projection data samples and a storage device that stores the compressed samples. The storage device on the rotatable part can include one or more solid state drives. For image reconstruction, the compressed samples are retrieved from the storage device, transferred across the interface to the stationary part. A decompressor at the stationary part decompresses the received compressed samples and provides decompressed samples to the image reconstruction processor. This abstract does not limit the scope of the invention as described in the claims.

摘要翻译： 计算机断层摄影系统具有静止部分，可旋转部分安装成围绕待检查物体旋转，以及固定部分和可旋转部分之间的界面。 可旋转部分包括X射线源，用于检测通过物体的X射线以产生投影数据样本的传感器阵列，压缩投影数据样本的压缩器和存储压缩样本的存储装置。 可旋转部件上的存储装置可以包括一个或多个固态驱动器。 对于图像重建，从存储设备检索压缩样本，通过接口传输到固定部分。 固定部分的解压缩器解压缩接收到的压缩样本，并将解压缩的样本提供给图像重构处理器。 该摘要并不限制如权利要求中所述的本发明的范围。

公开(公告)号：US08009883B2

公开(公告)日：2011-08-30

申请号：US11704482

申请日：2007-02-09

申请人： Zhengrong Ying ,  Kyle Guilbert ,  Carl R. Crawford

发明人： Zhengrong Ying ,  Kyle Guilbert ,  Carl R. Crawford

IPC分类号： G06K9/00

CPC分类号： G01V5/0008

摘要： A method of and a system for automatic object display of volumetric CT data for fast on-screen threat resolution are disclosed, wherein the CT data includes a CT image in a single energy CT scanner, or a CT image and a Z image in a multi-energy CT scanner, and a label image defining each object as a plurality of voxels of the volumetric CT data. The method comprises generating volumetric CT image data corresponding to a scanned bag; performing automatic threat detection to generate a label image; processing the volumetric CT data and the label image to obtain visualization parameters for each object; automatically generating display images for each object using corresponding visualization parameters; and displaying the generated display images for on-screen threat resolution.

摘要翻译： 公开了用于自动对象显示用于快速屏幕上威胁分辨率的体积CT数据的方法和系统，其中CT数据包括单能CT扫描仪中的CT图像，或多CT扫描仪中的CT图像和Z图像 - 能量CT扫描器和将每个对象定义为体积CT数据的多个体素的标签图像。 该方法包括产生对应于扫描袋的体积CT图像数据; 执行自动威胁检测以生成标签图像; 处理体积CT数据和标签图像以获得每个对象的可视化参数; 使用相应的可视化参数自动生成每个对象的显示图像; 并显示生成的显示图像以进行屏幕上的威胁解决。

公开(公告)号：US20100128949A1

公开(公告)日：2010-05-27

申请号：US12352116

申请日：2009-01-12

申请人： Albert W. Wegener ,  Carl R. Crawford ,  Yi Ling

发明人： Albert W. Wegener ,  Carl R. Crawford ,  Yi Ling

IPC分类号： G06K9/60 ,  G06K9/00

CPC分类号： G06T9/00 ,  H04N19/15 ,  H04N19/17 ,  H04N19/196

摘要： A computed tomography system has a stationary part, a rotatable part mounted for rotation around an object to be examined and an interface between the stationary part and the rotatable part. The rotatable part includes an x-ray source, a sensor array for detecting x-rays passing through the object to produce projection data samples, a compressor that compresses the projection data samples and a storage device that stores the compressed samples. The storage device on the rotatable part can include one or more solid state drives. For image reconstruction, the compressed samples are retrieved from the storage device, transferred across the interface to the stationary part. A decompressor at the stationary part decompresses the received compressed samples and provides decompressed samples to the image reconstruction processor. This abstract does not limit the scope of the invention as described in the claims.

摘要翻译： 计算机断层摄影系统具有静止部分，可旋转部分安装成围绕待检查物体旋转，以及固定部分和可旋转部分之间的界面。 可旋转部分包括X射线源，用于检测通过物体的X射线以产生投影数据样本的传感器阵列，压缩投影数据样本的压缩器和存储压缩样本的存储装置。 可旋转部件上的存储装置可以包括一个或多个固态驱动器。 对于图像重建，从存储设备检索压缩样本，通过接口传输到固定部分。 固定部分的解压缩器解压缩接收到的压缩样本，并将解压缩的样本提供给图像重构处理器。 该摘要并不限制如权利要求中所述的本发明的范围。

公开(公告)号：US07692650B2

公开(公告)日：2010-04-06

申请号：US11142216

申请日：2005-06-01

申请人： Zhengrong Ying ,  Matthew Hirsch ,  Purvin Desai ,  Kyle Guilbert ,  Sergey Simanovsky ,  Carl R. Crawford

发明人： Zhengrong Ying ,  Matthew Hirsch ,  Purvin Desai ,  Kyle Guilbert ,  Sergey Simanovsky ,  Carl R. Crawford

IPC分类号： G06T17/00

CPC分类号： A61B6/482 ,  A61B6/03 ,  G01V5/0041 ,  G01V5/005 ,  G06T11/008

摘要： A method of and a system for displaying volumetric multi-energy CT images are disclosed, wherein a CT image, a Z image, and a label image from an automatic explosive detection are provided, are disclosed. The method comprises generating an index image through a nonlinear transformation of the CT image, the Z image, and the label image, rotating and coloring the index image as desired, and rendering and displaying the rotated and colored image.

摘要翻译： 公开了一种用于显示体积多能CT图像的方法和系统，其中提供了CT图像，Z图像和来自自动爆炸检测的标签图像。 该方法包括通过CT图像，Z图像和标签图像的非线性变换生成索引图像，根据需要旋转和着色索引图像，以及渲染和显示旋转和着色图像。