ATTENUATION CORRECTION OF MR COILS IN A HYBRID PET/MR SYSTEM
    1.
    发明申请
    ATTENUATION CORRECTION OF MR COILS IN A HYBRID PET/MR SYSTEM 有权
    混合PET / MR系统中MR线圈的衰减校正

    公开(公告)号:US20110317900A1

    公开(公告)日:2011-12-29

    申请号:US13148053

    申请日:2010-01-18

    IPC分类号: G06K9/00 A61B5/055 G01P21/00

    摘要: Nuclear image data generated by a multimodal imaging device, such as a combined position emission tomography (PET)/magnetic resonance (MR) scanner (12, 14), is attenuation-corrected with a combined patient-specific attenuation correction (AC) map and an AC map template (70) for an MR coil (72) that is present in both the nuclear and MR scanning procedures. template library (46) contains templates for each of a plurality of MR coils and other accessories. Each template is generated on one of two manners. The coil may be imaged inside the PET scanner 14 with the transmission source 16 (e.g., Ge-68 or Cs-137). A transmission image 48 is reconstructed using the known algorithms and may be used as the AC template directly. Alternatively, the template can be generated by creating a global histogram of the transmission image and identifying segments of the coil or other accessory. An average linear attenuation coefficient (LAC) value is determined from the distribution of the histogram. The coil or other accessory is imaged using a high resolution CT scan, and the CT image is segmented and assigned the computed LAC values determined from the distribution of the histogram to create the AC map template for the coil.

    摘要翻译: 由多模式成像装置(例如组合位置发射断层扫描(PET)/磁共振(MR)扫描仪(12,14))生成的核图像数据用组合的患者特异性衰减校正(AC)图和 用于MR线圈(72)的AC映射模板(70),其存在于核和MR扫描过程中。 模板库(46)包含用于多个MR线圈和其他附件中的每一个的模板。 每个模板都以两种方式之一生成。 线圈可以利用透射源16(例如Ge-68或Cs-137)在PET扫描器14内成像。 使用已知算法重构发送图像48,并且可以直接用作AC模板。 或者,可以通过创建传输图像的全局直方图并识别线圈或其他附件的段来生成模板。 根据直方图的分布确定平均线性衰减系数(LAC)值。 使用高分辨率CT扫描对线圈或其他附件进行成像,并且对CT图像进行分割并分配从直方图的分布确定的计算的LAC值,以创建线圈的AC图谱模板。

    Attenuation correction of MR coils in a hybrid PET/MR system
    2.
    发明授权
    Attenuation correction of MR coils in a hybrid PET/MR system 有权
    混合PET / MR系统中MR线圈的衰减校正

    公开(公告)号:US08774473B2

    公开(公告)日:2014-07-08

    申请号:US13148053

    申请日:2010-01-18

    摘要: Nuclear image data generated by a multimodal imaging device, such as a combined position emission tomography (PET)/magnetic resonance (MR) scanner (12, 14), is attenuation-corrected with a combined patient-specific attenuation correction (AC) map and an AC map template (70) for an MR coil (72) that is present in both the nuclear and MR scanning procedures. A template library (46) contains templates for each of a plurality of MR coils and other accessories. Each template is generated on one of two manners. The coil may be imaged inside the PET scanner 14 with the transmission source 16 (e.g., Ge-68 or Cs-137). A transmission image 48 is reconstructed using the known algorithms and may be used as the AC template directly. Alternatively, the template can be generated by creating a global histogram of the transmission image and identifying segments of the coil or other accessory. An average linear attenuation coefficient (LAC) value is determined from the distribution of the histogram. The coil or other accessory is imaged using a high resolution CT scan, and the CT image is segmented and assigned the computed LAC values determined from the distribution of the histogram to create the AC map template for the coil.

    摘要翻译: 由多模式成像装置(例如组合位置发射断层扫描(PET)/磁共振(MR)扫描仪(12,14))生成的核图像数据用组合的患者特异性衰减校正(AC)图和 用于MR线圈(72)的AC映射模板(70),其存在于核和MR扫描过程中。 模板库(46)包含用于多个MR线圈和其他附件中的每一个的模板。 每个模板都以两种方式之一生成。 线圈可以利用透射源16(例如Ge-68或Cs-137)在PET扫描器14内成像。 使用已知算法重构发送图像48,并且可以直接用作AC模板。 或者,可以通过创建传输图像的全局直方图并识别线圈或其他附件的段来生成模板。 根据直方图的分布确定平均线性衰减系数(LAC)值。 使用高分辨率CT扫描对线圈或其他附件进行成像,并且对CT图像进行分割并分配从直方图的分布确定的计算的LAC值,以创建线圈的AC图谱模板。

    METHOD AND APPARATUS FOR ITERATIVE RECONSTRUCTION
    4.
    发明申请
    METHOD AND APPARATUS FOR ITERATIVE RECONSTRUCTION 有权
    用于迭代重建的方法和装置

    公开(公告)号:US20130343672A1

    公开(公告)日:2013-12-26

    申请号:US13531082

    申请日:2012-06-22

    IPC分类号: G06T11/00

    摘要: A method is provided for reconstructing an image of an object that includes image elements. The method includes accessing measurement data associated with the image elements, introducing an auxiliary variable to transform an original problem of reconstructing the image to a constrained optimization problem, and solving the constrained optimization problem using a method of multipliers to create a sequence of sub-problems and solve the sequence of sub-problems. Solving the sequence of sub-problems includes reconstructing the image by optimizing a first objective function. The first objective function is optimized by iteratively solving a nested sequence of approximate optimization problems. An inner loop iteratively optimizes a second objective function approximating the first objective function. An outer loop utilizes the solution of the second objective function to optimize the first objective function.

    摘要翻译: 提供了一种用于重构包括图像元素的对象的图像的方法。 该方法包括访问与图像元素相关联的测量数据,引入辅助变量以将原始图像重建问题转换为约束优化问题,以及使用乘法器的方法来解决约束优化问题以创建子问题序列 并解决子问题的顺序。 解决子问题的顺序包括通过优化第一目标函数重建图像。 通过迭代求解近似优化问题的嵌套序列,优化了第一个目标函数。 内循环迭代地优化接近于第一目标函数的第二目标函数。 外环利用第二目标函数的解来优化第一目标函数。

    Method and apparatus for iterative reconstruction
    5.
    发明授权
    Method and apparatus for iterative reconstruction 有权
    迭代重建的方法和装置

    公开(公告)号:US08885975B2

    公开(公告)日:2014-11-11

    申请号:US13531082

    申请日:2012-06-22

    IPC分类号: G06K9/36 G06K9/00 G06T11/00

    摘要: A method is provided for reconstructing an image of an object that includes image elements. The method includes accessing measurement data associated with the image elements, introducing an auxiliary variable to transform an original problem of reconstructing the image to a constrained optimization problem, and solving the constrained optimization problem using a method of multipliers to create a sequence of sub-problems and solve the sequence of sub-problems. Solving the sequence of sub-problems includes reconstructing the image by optimizing a first objective function. The first objective function is optimized by iteratively solving a nested sequence of approximate optimization problems. An inner loop iteratively optimizes a second objective function approximating the first objective function. An outer loop utilizes the solution of the second objective function to optimize the first objective function.

    摘要翻译: 提供了一种用于重构包括图像元素的对象的图像的方法。 该方法包括访问与图像元素相关联的测量数据,引入辅助变量以将原始图像重建问题转换为约束优化问题,以及使用乘法器的方法来解决约束优化问题以创建子问题序列 并解决子问题的顺序。 解决子问题的顺序包括通过优化第一目标函数重建图像。 通过迭代求解近似优化问题的嵌套序列,优化了第一个目标函数。 内循环迭代地优化接近于第一目标函数的第二目标函数。 外环利用第二目标函数的解来优化第一目标函数。