Method and apparatus for fast natural log(X) calculation
    1.
    发明授权
    Method and apparatus for fast natural log(X) calculation 失效
    快速自然对数(X)计算方法和装置

    公开(公告)号:US07031993B1

    公开(公告)日:2006-04-18

    申请号:US09507521

    申请日:2000-02-18

    IPC分类号: G06F1/02

    摘要: A method for computing a natural logarithm function includes partitioning a mantissa region between 1 and 2 into N equally spaced sub-regions; precomputing a reference point ai of each of the N equally spaced sub-regions, where i=0, . . . ,N−1; selecting N sufficiently large so that, within each sub-region, a first degree polynomial in m computes log(m) to within a preselected degree of accuracy for any m within the sub-region, where m is a mantissa of a binary floating point representation of a variable x; and computing a value of log(x) for a binary floating point representation of x stored in a memory of a computing device utilizing the first degree polynomial in m.

    摘要翻译: 用于计算自然对数函数的方法包括将1和2之间的尾数区分成N个等间隔的子区域; 预先计算N个等间隔子区域中的每一个的参考点,其中i = 0,...。 。 。 ,N-1; 选择N足够大,使得在每个子区域内,对于子区域内的任何m,m中的第一度数多项式计算log(m)到预选的精度度,其中m是二进制浮点的尾数 变量x的表示 以及使用m中的第一度多项式计算存储在计算装置的存储器中的x的二进制浮点表示的log(x)的值。

    Methods and apparatus for high pitch helical computed tomography image reconstruction
    2.
    发明授权
    Methods and apparatus for high pitch helical computed tomography image reconstruction 失效
    高螺距螺旋计算机断层扫描图像重建方法与装置

    公开(公告)号:US06490334B1

    公开(公告)日:2002-12-03

    申请号:US09896957

    申请日:2001-06-29

    IPC分类号: A61B603

    摘要: There is therefore provided, in one aspect, a method for imaging an object utilizing a computed tomographic (CT) imaging system having a rotating gantry, a multislice detector array on the rotating gantry and using at least n>1 rows of detector channels, and a radiation source on the rotating gantry configured to project a beam of radiation towards the multislice detector array through an object to be imaged. The method includes helically scanning the object with the CT imaging system at a pitch p>n to acquire projection data from the n rows of detector channels; applying a combined helical weight and conjugate weight to at least a portion of the acquired projection data to produce virtual projection data compensating for incomplete helical row data of the acquired projection data; and reconstructing an image of the object utilizing the acquired projection data and the virtual projection data.

    摘要翻译: 因此,在一个方面中,提供一种利用具有旋转机架的计算机断层摄影(CT)成像系统对成像进行成像的方法,在旋转机架上使用多层检测器阵列并且至少使用n> 1行检测器通道,以及 旋转台架上的辐射源被配置成通过待成像的物体将辐射束投射到多层检测器阵列。 该方法包括用间距p> n的CT成像系统螺旋扫描物体,以从n行检测器通道获取投影数据; 对所获取的投影数据的至少一部分应用组合的螺旋重量和共轭权重,以产生补偿所获取的投影数据的不完整螺旋行数据的虚拟投影数据; 以及使用所获取的投影数据和虚拟投影数据来重建对象的图像。

    Automated crystal identification achieved via modifiable templates
    5.
    发明授权
    Automated crystal identification achieved via modifiable templates 有权
    通过可修改的模板实现自动晶体识别

    公开(公告)号:US08750569B2

    公开(公告)日:2014-06-10

    申请号:US13702150

    申请日:2011-04-27

    IPC分类号: G06K9/00 G01V5/12

    CPC分类号: G06K9/78 G01T1/1647

    摘要: A nuclear imaging system (10) includes a crystal identification system (40) which receives a flood image (30) which includes a plurality of peaks, each peak responsive to radiation detected by a corresponding scintillator crystal. A crystal identification processor (42) partitions the flood image (30) into a plurality of regions (56), each region being masked to correspond to one of an array of nuclear detectors. A model image (62) is generated in which the at least one Gaussian models represents the identified peaks. Misidentified peaks in the model image (62) in which locations of the peaks in the flood image (30) differ from the corresponding scintillator crystal are determined and the locations of the misidentified peaks in the flood image (30) are corrected. A calibration processor (43) corrects geometric distortions in acquired projection data according to the corrected peaks.

    摘要翻译: 核成像系统(10)包括晶体识别系统(40),其接收包括多个峰值的泛洪图像(30),每个峰值响应于由相应的闪烁体晶体检测的辐射。 晶体识别处理器(42)将洪水图像(30)分割成多个区域(56),每个区域被掩蔽以对应于核探测器阵列之一。 产生模型图像(62),其中至少一个高斯模型表示所识别的峰值。 确定在洪水图像(30)中的峰的位置与相应的闪烁体晶体不同的模型图像(62)中的误识别的峰,并校正洪水图像(30)中的错误识别的峰的位置。 校准处理器(43)根据校正的峰值校正获取的投影数据中的几何失真。

    MULTI-SECTION ALIGNMENT OF IMAGING DATA
    6.
    发明申请
    MULTI-SECTION ALIGNMENT OF IMAGING DATA 有权
    成像数据的多段对齐

    公开(公告)号:US20120288177A1

    公开(公告)日:2012-11-15

    申请号:US13511676

    申请日:2010-11-18

    IPC分类号: G06K9/32

    摘要: A method of aligning multiple volumetric sections of imaging data is provided. The method comprises aligning a primary volumetric section and a secondary volumetric section which is adjacent to the primary volumetric imaging section, for moving the secondary volumetric section into alignment with the primary volumetric section. A related apparatus for performing the method is also provided.

    摘要翻译: 提供了一种对准成像数据的多个体积部分的方法。 该方法包括对准主体积部分和与主体积成像部分相邻的次要体积部分,用于将次体积部分移动成与主容积部分对准。 还提供了一种用于执行该方法的相关装置。

    Methods and apparatus for reconstructing an image of an object
    9.
    发明授权
    Methods and apparatus for reconstructing an image of an object 失效
    用于重建物体的图像的方法和装置

    公开(公告)号:US07013034B2

    公开(公告)日:2006-03-14

    申请号:US10268323

    申请日:2002-10-10

    IPC分类号: G06K9/00

    摘要: A method for reconstructing an image of an object utilizing a computed tomographic (CT) imaging system having a radiation source configured to project a beam of radiation through an object and towards a multislice detector array configured to sense attenuation of the radiation passing through the object; the method includes helically scanning an object to acquire a plurality of slices of projection data, generating a separate projection dataset for each of N separate detector rows wherein the separate projection datasets include detector row projection data and detector row conjugate projection data, combining the detector row projection data and the detector row conjugate projection data, and helically weighting the combined projection data using a combined helical weighting and conjugate data weighting algorithm such that a greater weight is applied to combined center row projection data than to at least one outermost detector row projection data.

    摘要翻译: 一种用于使用计算机断层摄影(CT)成像系统来重建物体的图像的方法,所述计算机断层摄影(CT)成像系统具有被配置成将辐射束投射穿过物体并朝向被配置为感测穿过物体的辐射的衰减的多层检测器阵列投影的辐射源; 该方法包括螺旋扫描对象以获取多个投影数据片段,为N个单独检测器行中的每一个生成单独的投影数据集,其中分离的投影数据集包括检测器行投影数据和检测器行共轭投影数据,组合检测器行 投影数据和检测器行共轭投影数据,并且使用组合的螺旋加权和共轭数据加权算法对组合的投影数据进行螺旋加权,使得对组合的中心行投影数据施加更大的权重,而不是至少一个最外检测器行投影数据 。

    Scan data correction view weighting of computed tomographic images
    10.
    发明授权
    Scan data correction view weighting of computed tomographic images 失效
    扫描数据校正视图加权计算机断层图像

    公开(公告)号:US06584165B1

    公开(公告)日:2003-06-24

    申请号:US10064400

    申请日:2002-07-10

    IPC分类号: A61B603

    CPC分类号: A61B6/032 Y10S378/901

    摘要: One aspect of the present invention is a method for reconstructing computed tomographic (CT) images. The method includes generating a plurality of projection data, calculating a plurality of base weights using the projection data for each series of images to be reconstructed, storing the base weights in an external memory, and applying a z-smoothing module to the base weights to determine a plurality of final weights. The view weighting process then includes applying the final weights to the projection data for each image.

    摘要翻译: 本发明的一个方面是用于重建计算机断层摄影(CT)图像的方法。 该方法包括生成多个投影数据,使用要重构的每一系列图像的投影数据来计算多个基本权重,将基本权重存储在外部存储器中,以及将z-平滑模块应用于基本权重 确定多个最终权重。 然后,视图加权处理包括将最终权重应用于每个图像的投影数据。