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    Method and apparatus for correcting for beam hardening in CT images
    1.
    发明授权
    Method and apparatus for correcting for beam hardening in CT images 失效
    用于校正CT图像中的束硬化的方法和装置

    公开(公告)号：US07391844B2

    公开(公告)日：2008-06-24

    申请号：US11036618

    申请日：2005-01-14

    申请人： Xiaoye Wu ,  Piero Ugo Simoni ,  Thomas Louis Toth ,  Neil Barry Bromberg

    发明人： Xiaoye Wu ,  Piero Ugo Simoni ,  Thomas Louis Toth ,  Neil Barry Bromberg

    IPC分类号： A61B6/00

    CPC分类号： A61B6/488 ,  A61B6/032 ,  A61B6/482 ,  A61B6/583

    摘要： A method for determining a correction for beam hardening in CT images includes obtaining air scans at a plurality of kVp's, determining detection efficiencies for detector elements of the CT imaging apparatus, and estimating projection values through a combination of at least two different materials of different thicknesses. The method further includes determining a transfer function that translates the estimated projection values into ideal projection values for at least two of the different materials and storing the transfer function as the beam hardening correction for images of the CT imaging apparatus.

    摘要翻译： 用于确定CT图像中的束硬化校正的方法包括以多个kVp获得空气扫描，确定CT成像装置的检测器元件的检测效率，以及通过组合至少两种不同厚度的不同厚度的材料来估计投影值 。 该方法还包括确定将估计的投影值转换为不同材料中的至少两种的理想投影值并将传递函数存储为CT成像装置的图像的束硬化校正的传递函数。

    Methods for spectrally calibrating CT imaging apparatus detectors
    2.
    发明授权
    Methods for spectrally calibrating CT imaging apparatus detectors 有权
    频谱校准CT成像装置检测器的方法

    公开(公告)号：US07086780B2

    公开(公告)日：2006-08-08

    申请号：US10850009

    申请日：2004-05-20

    申请人： Xiaoye Wu ,  Neil Barry Bromberg ,  Alexander Kolker ,  Piero Ugo Simoni ,  Thomas Louis Toth

    发明人： Xiaoye Wu ,  Neil Barry Bromberg ,  Alexander Kolker ,  Piero Ugo Simoni ,  Thomas Louis Toth

    IPC分类号： G01D18/00

    CPC分类号： A61B6/583 ,  A61B6/032 ,  A61B6/585

    摘要： A method for calibrating a computed tomographic imaging apparatus having a gantry, a radiation source operable at a plurality of kVp's, and a detector array having a plurality of detector elements includes using a system detection function to estimate signals of each detector element that would have been detected through air and through a given thickness of water to determine estimated datasets. The estimated datasets are used to determine data pair sets each comprising a normalized water projection value and an ideal projection value for each detector element. The method further includes determining and storing a representation of a mapping function of the normalized water projections values to the ideal projection values in a memory of the computed tomographic imaging apparatus as a spectral calibration of the computed tomographic imaging apparatus.

    摘要翻译： 一种用于校准具有台架的计算机断层成像设备的方法，可在多个kVp处操作的辐射源以及具有多个检测器元件的检测器阵列的方法包括使用系统检测功能来估计已经被检测到的每个检测器元件的信号 通过空气和通过给定厚度的水检测以确定估计的数据集。 估计的数据集用于确定每个包括每个检测器元件的归一化水投影值和理想投影值的数据对集合。 该方法还包括将计算机断层成像设备的存储器中的归一化水投影值的映射函数的映射函数确定和存储为理想投影值，作为计算机断层成像设备的光谱校准。

    Methods and apparatus for calibrating CT X-ray beam tracking loop
    7.
    发明申请
    Methods and apparatus for calibrating CT X-ray beam tracking loop 失效
    用于校准CT X射线束追踪回路的方法和装置

    公开(公告)号：US20060251210A1

    公开(公告)日：2006-11-09

    申请号：US11124331

    申请日：2005-05-06

    申请人： Edward Henry Chao ,  Thomas Louis Toth ,  Maryam Shaukat Hameed

    发明人： Edward Henry Chao ,  Thomas Louis Toth ,  Maryam Shaukat Hameed

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

    CPC分类号： A61B6/585 ,  A61B6/4275

    摘要： A method for determining tracking control parameters for positioning an x-ray beam of a computed tomography imaging system, the imaging system including a movable collimator positionable in steps and a detector array including a plurality of detector elements arranged in rows and channels, the rows extending from a detector A-side to a detector B-side. The method includes determining a detector A-side and a detector B-side target beam penumbra position, computing a plurality of Z-ratio curves corresponding to different detector rows and detector channels, and comparing the Z-ratio curves at the detector A-side and detector B-side target beam positions to determine the optimal Z-ratio curve and corresponding detector channels and rows for controlling the X-ray beam positioning.

    摘要翻译： 一种用于确定用于定位计算机断层摄影成像系统的x射线束的跟踪控制参数的方法，所述成像系统包括可定位成可移动的准直器和包括排列成行和通道的多个检测器元件的检测器阵列，所述行延伸 从检测器A侧到检测器B侧。 该方法包括确定检测器A侧和检测器B侧目标束半影位置，计算对应于不同检测器行和检测器通道的多个Z比曲线，以及比较检测器A侧的Z比曲线 和检测器B侧目标光束位置，以确定最佳Z比率曲线以及用于控制X射线束定位的相应检测器通道和行。

    Computed tomography dose indexing phantom selection for dose reporting
    8.
    发明授权
    Computed tomography dose indexing phantom selection for dose reporting 有权
    计算机断层扫描剂量指数幻像选择用于剂量报告

    公开(公告)号：US07082183B2

    公开(公告)日：2006-07-25

    申请号：US10710563

    申请日：2004-07-21

    申请人： Thomas Louis Toth ,  David Michael Hoffman

    发明人： Thomas Louis Toth ,  David Michael Hoffman

    IPC分类号： H05G1/28

    CPC分类号： A61B6/032 ,  A61B6/4035 ,  A61B6/488 ,  A61B6/583 ,  G06F19/00

    摘要： A computed tomography assembly is providing including an x-ray gantry assembly, an x-ray source projecting a beam of x-rays, a detector assembly positioned opposite the x-ray source and receiving the beam of x-rays, and a control mechanism in communication with the x-ray source and the detector assembly. The control mechanism includes logic adapted to: execute at least one scout scan of the object to produce a first scout scan image; generate an elliptical patient model based on the first scout scan image; match the elliptical patient model to a phantom diameter approximation; generate a dose report based on the phantom diameter approximation; and display said dose report on a display in communication with the control mechanism.

    摘要翻译： 提供了一种计算机断层摄影组件，其包括x射线门架组件，投射X射线束的x射线源，与x射线源相对设置并接收x射线束的检测器组件，以及控制机构 与x射线源和检测器组件通信。 所述控制机构包括适于：执行对象的至少一次侦察扫描以产生第一侦察扫描图像的逻辑; 基于第一侦察扫描图像生成椭圆形病人模型; 将椭圆形患者模型与幻影直径近似相匹配; 基于幻影直径近似生成剂量报告; 并在与控制机构通信的显示器上显示所述剂量报告。

    Methods and apparatus for dynamical helical scanned image production
    9.
    发明授权
    Methods and apparatus for dynamical helical scanned image production 有权
    动态螺旋扫描图像制作方法与装置

    公开(公告)号：US06977984B2

    公开(公告)日：2005-12-20

    申请号：US10680688

    申请日：2003-10-07

    申请人： Jiang Hsieh ,  Eugene Clifford Williams ,  Thomas Louis Toth

    发明人： Jiang Hsieh ,  Eugene Clifford Williams ,  Thomas Louis Toth

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

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

    摘要： The present invention provides 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： 本发明提供了一种用于产生对象的图像的方法。 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。