FOUR-DIMENSIONAL (4D) IMAGE VERIFICATION IN RESPIRATORY GATED RADIATION THERAPY
    2.
    发明申请
    FOUR-DIMENSIONAL (4D) IMAGE VERIFICATION IN RESPIRATORY GATED RADIATION THERAPY 审中-公开
    呼吸机辐射治疗中的四维(4D)图像验证

    公开(公告)号:WO2008019118A2

    公开(公告)日:2008-02-14

    申请号:PCT/US2007/017443

    申请日:2007-08-06

    Abstract: A method for four-dimensional (4D) image verification in respiratory gated radiation therapy, includes: acquiring 4D computed tomography (CT) images, each of the 4D CT images representing a breathing phase of a patient and tagged with a corresponding time point of a first surrogate signal (102); acquiring fluoroscopic images of the patient under free breathing, each of the fluoroscopic images tagged with a corresponding time point of a second surrogate signal (110); generating digitally reconstructed radiographs (DRRs) for each breathing phase represented by the 4D CT images (116); generating a similarity matrix to assess a degree of resemblance in a region of interest between the DRRs and the fluoroscopic images (117); computing a compounded similarity matrix by averaging values of the similarity matrix across different time points of the breathing phase during a breathing period of the patient (118); determining an optimal time point synchronization between the DRRs and the fluoroscopic images by using the compounded similarity matrix (120); and acquiring a third surrogate signal and turning a treatment beam on or off according to the optimal time point synchronization (128).

    Abstract translation: 一种用于呼吸门控放射疗法中的四维(4D)图像验证的方法,包括:获取4D计算机断层摄影(CT)图像,每个4D CT图像表示患者的呼吸相位;以及 用第一代理信号的对应时间点标记(102); 在自由呼吸下采集患者的透视图像,每个透视图像用第二代理信号(110)的对应时间点标记; 针对由所述4D CT图像(116)表示的每个呼吸相位生成数字重建射线照片(DRR); 生成相似度矩阵以评估所述DRR与所述荧光透视图像之间的感兴趣区域中的相似程度(117); 通过在所述患者的呼吸周期期间对所述呼吸阶段的不同时间点上的所述相似性矩阵的值进行平均来计算复合相似性矩阵; 通过使用复合相似度矩阵(120)确定DRR与荧光透视图像之间的最佳时间点同步; 以及获取第三替代信号并且根据最佳时间点同步来开启或关闭治疗束(128)。

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