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    • 4. 发明授权
    • Reconstruction of local patient doses in computed tomography
    • 计算机断层扫描中局部患者剂量的重建
    • US07787669B2
    • 2010-08-31
    • US10543567
    • 2004-01-19
    • Henrik BotterweckLothar Spies
    • Henrik BotterweckLothar Spies
    • G06K9/00
    • A61B6/032A61N5/1031Y10S128/922
    • In order to reduce an x-ray dose applied to a patient, it is necessary to know the dose absorbed by the patient. According to the present invention, there is provided a method of determining a local patient dose applied to a patient where after the reconstruction of the scan data into a diagnostic image, the scan data are backprojected into the patient volume, using the attenuation information of the diagnostic image to form a spatially varying photon fluence map. In parallel, the diagnostic image is segmented into anatomical structures to which dose-weighting factors are assigned. The locally absorbed dose is then calculated on the basis of the fluence map and the corresponding dose weights.
    • 为了减少施加到患者的x射线剂量,需要知道患者吸收的剂量。 根据本发明,提供了一种确定施用于患者的局部患者剂量的方法,其中在将扫描数据重建为诊断图像之后,使用所述扫描数据的衰减信息将扫描数据反向投影到患者体积中 诊断图像形成空间变化的光子注量图。 并行地,诊断图像被分割成分配给剂量加权因子的解剖结构。 然后根据注量图和相应的剂量重量计算局部吸收剂量。
    • 6. 发明授权
    • Radial adaptive filter for metal artifact correction
    • 用于金属伪影校正的径向自适应滤波器
    • US07991243B2
    • 2011-08-02
    • US11815215
    • 2006-02-01
    • Matthieu BalHasan CelikKai EckLothar SpiesKrishna Subramanyan
    • Matthieu BalHasan CelikKai EckLothar SpiesKrishna Subramanyan
    • G06K9/40G06K9/00A61B6/00
    • G06T11/008
    • A diagnostic imaging system (10) corrects metal artifact streaks (38) emanating from a metal object (36) in a tomographic image (T). A first processor (40) reduces streaks (38) caused by mild artifacts by applying an adaptive filter (82). The filter (82) is perpendicularly oriented toward the center of the metal object (36). The weight of the filter (82) is a function of the local structure tensor and the vector pointing to the metal object (36). If it is determined that the strong artifacts are present in the image, a second processor (48) applies a sinogram completed image algorithm to correct for severe artifacts in the image. The sinogram completed image and adaptively filtered image are fused to a final corrected image. In the fusion process, highly corrupted tomographic regions are replaced by the result of the sinogram completed image and the remainder is replaced by the adaptively filtered image.
    • 诊断成像系统(10)校正在断层图像(T)中从金属物体(36)发出的金属假象条纹(38)。 第一处理器(40)通过应用自适应滤波器(82)来减少由温和伪影引起的条纹(38)。 过滤器(82)朝向金属物体(36)的中心垂直取向。 过滤器(82)的重量是局部结构张量和指向金属物体(36)的矢量的函数。 如果确定图像中存在强伪像,则第二处理器(48)施加正弦图完成图像算法以校正图像中的严重伪像。 正弦图完成图像和自适应滤波图像融合到最终校正图像。 在融合过程中,高度破坏的断层摄影区域被正弦图完成图像的结果所替代,其余部分由自适应滤波图像代替。