Spectral CT
    11.
    发明授权
    Spectral CT 有权
    光谱CT

    公开(公告)号:US08442184B2

    公开(公告)日:2013-05-14

    申请号:US12996985

    申请日:2009-06-01

    IPC分类号: A61B6/00

    摘要: An imaging system includes a radiation source (106, T1, T2, T3) that rotates about an examination region and emits radiation that traverses the examination region. The radiation source (106, T1, T2, T3) emits radiation having an energy spectrum that is selectively alternately switched between at least two different energy spectra during an imaging procedure. The system further includes an energy-resolving detector array (116, D1, D2, D3) that detects radiation traversing the examination region. The energy-resolving detector array (116, D1, D2, D3) resolves the detected radiation over at least two different energy ranges and produces energy-resolved output signals as a function of both emission energy spectrum and energy range. The system further includes a reconstructor (126) that performs a spectral reconstruction of the energy-resolved output signals. In another embodiment, the detector array (116) includes a photon-counting detector array (116).

    摘要翻译: 成像系统包括围绕检查区域旋转并且发射穿过检查区域的辐射的辐射源(106,T1,T2,T3)。 辐射源(106,T1,T2,T3)发射具有在成像过程期间在至少两个不同能量谱之间选择性交替切换的能谱的辐射。 该系统还包括检测穿过检查区域的辐射的能量分辨检测器阵列(116,D1,D2,D3)。 能量分辨检测器阵列(116,D1,D2,D3)通过至少两个不同的能量范围来解析检测到的辐射,并且产生作为发射能量谱和能量范围的函数的能量分辨的输出信号。 该系统还包括执行能量分辨输出信号的频谱重建的重建器(126)。 在另一个实施例中,检测器阵列(116)包括光子计数检测器阵列(116)。

    METHOD AND APPARATUS TO IMPROVE CT IMAGE ACQUISITION USING A DISPLACED GEOMETRY
    12.
    发明申请
    METHOD AND APPARATUS TO IMPROVE CT IMAGE ACQUISITION USING A DISPLACED GEOMETRY 有权
    使用位移几何来改进CT图像采集的方法和装置

    公开(公告)号:US20110182400A1

    公开(公告)日:2011-07-28

    申请号:US13120660

    申请日:2009-10-05

    IPC分类号: A61B6/03 G01N23/04

    CPC分类号: A61B6/032 A61B5/107 A61B6/027

    摘要: A method and apparatus are provided to improve CT image acquisition using a displaced acquisition geometry. A CT apparatus may be used having a source (102) and a detector (104) transversely displaced from a center (114) of a field of view (118) during acquisition of the projection data. The amount of transverse displacement may be determined based on the size of the object (108). The source and the detector may be adjusted to vary the size of the transverse field of view. The first data set acquired by the detector may be reconstructed and used to simulate missing projection data that could not be acquired by the detector at each projection angle. The measured projection data and the simulated projection data may be used to obtain a second data set. The second data set may be compared to the first data set to produce a corrected data set.

    摘要翻译: 提供了一种方法和装置,用于改善使用位移采集几何形状的CT图像采集。 可以使用CT装置,在获取投影数据期间具有从视场(118)的中心(114)横向移位的源(102)和检测器(104)。 可以基于物体(108)的尺寸来确定横向位移量。 源和检测器可以被调节以改变横向视场的大小。 由检测器获取的第一数据集可以被重构并用于模拟在每个投影角度不能由检测器获取的丢失的投影数据。 所测量的投影数据和模拟投影数据可用于获得第二数据集。 可以将第二数据集与第一数据集进行比较以产生校正数据集。

    Coherent-scatter computed tomography
    13.
    发明授权
    Coherent-scatter computed tomography 失效
    相干散射计算机断层扫描

    公开(公告)号:US07580499B2

    公开(公告)日:2009-08-25

    申请号:US10575584

    申请日:2004-10-05

    IPC分类号: A61B6/03

    摘要: Known reconstruction techniques from coherent scattered x-rays apply non-exact reconstruction techniques. According to the present invention, a relatively wide spectrum of wave-vector transfers q of the scattered x-ray photons is acquired. The projection data is interpreted as line integrals in the x y-q space and the projection data is resorted to correspond to an acquisition along any source trajectory. Due to this, an exact helical reconstruction algorithms may be applied and redundant data may be used to obtain a better image quality.

    摘要翻译: 来自相干散射X射线的已知重建技术应用非精确重建技术。 根据本发明,获得了散射的x射线光子的相对宽的波矢量传输q。 投影数据被解释为x y-q空间中的线积分,并且投影数据被用来对应于沿着任何源轨迹的获取。 因此,可以应用精确的螺旋重建算法,并且可以使用冗余数据来获得更好的图像质量。

    Method and apparatus to improve CT image acquisition using a displaced geometry
    14.
    发明授权
    Method and apparatus to improve CT image acquisition using a displaced geometry 有权
    使用位移几何来改善CT图像采集的方法和装置

    公开(公告)号:US08379791B2

    公开(公告)日:2013-02-19

    申请号:US13120660

    申请日:2009-10-05

    IPC分类号: A61B6/00

    CPC分类号: A61B6/032 A61B5/107 A61B6/027

    摘要: A method and apparatus are provided to improve CT image acquisition using a displaced acquisition geometry. A CT apparatus may be used having a source (102) and a detector (104) transversely displaced from a center (114) of a field of view (118) during acquisition of the projection data. The amount of transverse displacement may be determined based on the size of the object (108). The source and the detector may be adjusted to vary the size of the transverse field of view. The first data set acquired by the detector may be reconstructed and used to simulate missing projection data that could not be acquired by the detector at each projection angle. The measured projection data and the simulated projection data may be used to obtain a second data set. The second data set may be compared to the first data set to produce a corrected data set.

    摘要翻译: 提供了一种方法和装置,用于改善使用位移采集几何形状的CT图像采集。 可以使用CT装置,在获取投影数据期间具有从视场(118)的中心(114)横向移位的源(102)和检测器(104)。 可以基于物体(108)的尺寸来确定横向位移量。 源和检测器可以被调节以改变横向视场的大小。 由检测器获取的第一数据集可以被重构并用于模拟在每个投影角度不能由检测器获取的丢失的投影数据。 所测量的投影数据和模拟投影数据可用于获得第二数据集。 可以将第二数据集与第一数据集进行比较以产生校正数据集。

    SPECTRAL CT
    15.
    发明申请
    SPECTRAL CT 有权
    光谱CT

    公开(公告)号:US20110096892A1

    公开(公告)日:2011-04-28

    申请号:US12996985

    申请日:2009-06-01

    IPC分类号: H05G1/60

    摘要: An imaging system includes a radiation source (106, T1, T2, T3) that rotates about an examination region and emits radiation that traverses the examination region. The radiation source (106, T1, T2, T3) emits radiation having an energy spectrum that is selectively alternately switched between at least two different energy spectra during an imaging procedure. The system further includes an energy-resolving detector array (116, D1, D2, D3) that detects radiation traversing the examination region. The energy-resolving detector array (116, D1, D2, D3) resolves the detected radiation over at least two different energy ranges and produces energy-resolved output signals as a function of both emission energy spectrum and energy range. The system further includes a reconstructor (126) that performs a spectral reconstruction of the energy-resolved output signals. In another embodiment, the detector array (116) includes a photon-counting detector array (116).

    摘要翻译: 成像系统包括围绕检查区域旋转并且发射穿过检查区域的辐射的辐射源(106,T1,T2,T3)。 辐射源(106,T1,T2,T3)发射具有在成像过程期间在至少两个不同能量谱之间选择性交替切换的能谱的辐射。 该系统还包括检测穿过检查区域的辐射的能量分辨检测器阵列(116,D1,D2,D3)。 能量分辨检测器阵列(116,D1,D2,D3)通过至少两个不同的能量范围来解析检测到的辐射,并且产生作为发射能量谱和能量范围的函数的能量分辨的输出信号。 该系统还包括执行能量分辨输出信号的频谱重建的重建器(126)。 在另一个实施例中,检测器阵列(116)包括光子计数检测器阵列(116)。

    Imaging apparatus for generating an image of a region of interest
    16.
    发明授权
    Imaging apparatus for generating an image of a region of interest 有权
    用于产生感兴趣区域的图像的成像装置

    公开(公告)号:US08410448B2

    公开(公告)日:2013-04-02

    申请号:US12992285

    申请日:2009-05-15

    IPC分类号: G01T1/16

    摘要: The present invention relates to an imaging apparatus for generating an image of a region of interest. The imaging apparatus comprises a radiation source (2), a detection unit (6) for generating detection data and a moving unit (1, 7, 8) for moving the radiation source (2) and the region of interest relative to each other, while the detection data are generated. The imaging apparatus further comprises an identification unit (13) for identifying in the detection data high density detection data and non-high density detection data. A density weighting unit (14) density weights the detection data, wherein at least a part of the high density detection data has a smaller density weight than the non-high density detection data, and a reconstruction unit (15) reconstructs an image of the region of interest from the weighted detection data.

    摘要翻译: 本发明涉及一种用于产生感兴趣区域的图像的成像装置。 成像装置包括辐射源(2),用于产生检测数据的检测单元(6)和用于使辐射源(2)和感兴趣区域相对于彼此移动的移动单元(1,7,8) 同时生成检测数据。 该成像装置还包括用于在检测数据中识别高密度检测数据和非高密度检测数据的识别单元(13)。 密度加权单元(14)密度对检测数据进行加权,其中至少一部分高密度检测数据具有比非高密度检测数据更小的密度权重,并且重建单元(15)重建 来自加权检测数据的感兴趣区域。

    IMAGING APPARATUS FOR GENERATING AN IMAGE OF A REGION OF INTEREST
    17.
    发明申请
    IMAGING APPARATUS FOR GENERATING AN IMAGE OF A REGION OF INTEREST 有权
    用于产生一个利益区域的图像的成像装置

    公开(公告)号:US20110095197A1

    公开(公告)日:2011-04-28

    申请号:US12992285

    申请日:2009-05-15

    IPC分类号: A61B6/00 G06K9/00

    摘要: The present invention relates to an imaging apparatus for generating an image of a region of interest. The imaging apparatus comprises a radiation source (2), a detection unit (6) for generating detection data and a moving unit (1, 7, 8) for moving the radiation source (2) and the region of interest relative to each other, while the detection data are generated. The imaging apparatus further comprises an identification unit (13) for identifying in the detection data high density detection data and non-high density detection data. A density weighting unit (14) density weights the detection data, wherein at least a part of the high density detection data has a smaller density weight than the non-high density detection data, and a reconstruction unit (15) reconstructs an image of the region of interest from the weighted detection data.

    摘要翻译: 本发明涉及一种用于产生感兴趣区域的图像的成像装置。 成像装置包括辐射源(2),用于产生检测数据的检测单元(6)和用于使辐射源(2)和感兴趣区域相对于彼此移动的移动单元(1,7,8) 同时生成检测数据。 该成像装置还包括用于在检测数据中识别高密度检测数据和非高密度检测数据的识别单元(13)。 密度加权单元(14)密度对检测数据进行加权,其中至少一部分高密度检测数据具有比非高密度检测数据更小的密度权重,并且重建单元(15)重建 来自加权检测数据的感兴趣区域。

    APPARATUS FOR DETERMINING A HIGH DENSITY REGION IN AN IMAGE
    18.
    发明申请
    APPARATUS FOR DETERMINING A HIGH DENSITY REGION IN AN IMAGE 审中-公开
    用于确定图像中高密度区域的装置

    公开(公告)号:US20100189331A1

    公开(公告)日:2010-07-29

    申请号:US12664662

    申请日:2008-06-11

    IPC分类号: G06K9/00

    CPC分类号: G06T11/005 A61B6/5258

    摘要: The invention relates to an apparatus for determining a high density region in an image, wherein the apparatus comprises a provision unit (1, 2, 6, 7, 8) for providing projection data for reconstructing the image. The apparatus comprises further a high density shadow determination unit (12) for determining a high density shadow in the projection data and a backprojection unit (13) for backprojecting the determined high density shadow resulting in a high density image showing the high density region. The inventions relates further to a corresponding method and computer program for determining a high density region in an image.

    摘要翻译: 本发明涉及一种用于确定图像中的高密度区域的装置,其中该装置包括用于提供用于重构图像的投影数据的提供单元(1,2,6,7,8)。 该装置还包括用于确定投影数据中的高密度阴影的高密度阴影确定单元(12)和用于反向投影确定的高密度阴影的反投影单元(13),导致显示高密度区域的高密度图像。 本发明进一步涉及用于确定图像中的高密度区域的相应方法和计算机程序。

    Source and/or detector positioning system
    19.
    发明授权
    Source and/or detector positioning system 有权
    源和/或探测器定位系统

    公开(公告)号:US08693621B2

    公开(公告)日:2014-04-08

    申请号:US12990278

    申请日:2009-04-30

    IPC分类号: A61B6/03

    摘要: A medical imaging system includes a generally stationary gantry (102) and a rotating gantry (106), rotatably supported by the generally stationary gantry (102), that rotates about a longitudinal axis around an examination region. The medical imaging system further includes a radiation source (112) that emits a radiation beam that traverses the examination region. The radiation source (112) is moveably affixed to the rotating gantry (106) so as to translate in a direction of the longitudinal axis with respect to the rotating gantry (106) while scanning a subject in the examination region. The medical imaging system further includes a detector array (120) that detects the radiation beam that traverses the examination region and generates a signal indicative thereof. The detector array (120) is moveably affixed to the rotating gantry (106) so as to move in coordination with the radiation source (112) while scanning the subject in the examination region.

    摘要翻译: 医疗成像系统包括大致固定的机架(102)和旋转支架(106),旋转机架(106)由大体上固定的机架(102)可旋转地支撑,围绕检查区域围绕纵向轴线旋转。 医疗成像系统还包括发射穿过检查区域的辐射束的辐射源(112)。 辐射源(112)可移动地固定到旋转机架(106)上,以便在扫描检查区域中的被检体的同时相对于旋转台架(106)在纵向轴线的方向上平移。 医疗成像系统还包括检测器阵列(120),其检测穿过检查区域的辐射束并产生指示其的信号。 检测器阵列(120)可移动地固定到旋转机架(106),以在扫描检查区域中的对象时与辐射源(112)协调地移动。

    IMAGING SYSTEM FOR IMAGING AN OBJECT
    20.
    发明申请
    IMAGING SYSTEM FOR IMAGING AN OBJECT 有权
    用于成像对象的成像系统

    公开(公告)号:US20130279778A1

    公开(公告)日:2013-10-24

    申请号:US13978166

    申请日:2012-01-04

    IPC分类号: G06T11/00

    摘要: The invention relates to an imaging system for imaging an object. Projection data of the object are acquired by using a radiation source emitting primary radiation (14) from a primary focal spot (15) and unwanted secondary radiation (16) from secondary focal spots (17). A first image of the object is reconstructed from the acquired projection data, a forward projection of the secondary radiation through the first image is simulated for generating secondary projection data, and a second image is generated based on the acquired projection data and the secondary projection data. Since the secondary projection data, which can generally cause image artifacts, are determined, the reconstruction unit can consider these unwanted secondary projection data while reconstructing the second image, in order to reduce the influence of the secondary projection data on the reconstructed second image, thereby improving the image quality.

    摘要翻译: 本发明涉及一种用于对物体成像的成像系统。 通过使用从主焦点(15)发射主要辐射(14)的辐射源和来自次焦点(17)的不期望的次级辐射(16))来获取对象的投影数据。 从获取的投影数据重建物体的第一图像,模拟通过第一图像的次级辐射的向前投影用于产生二次投影数据,并且基于所获取的投影数据和二次投影数据生成第二图像 。 由于确定了通常可以引起图像伪影的二次投影数据,所以重建单元可以在重构第二图像的同时考虑这些不需要的二次投影数据,以便减少二次投影数据对重构的第二图像的影响,由此 提高图像质量。