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    • 10. 发明申请
    • COMPUTED TOMOGRAPHY SYSTEM AND METHOD FOR TRACKING A BOLUS
    • 计算机图像系统和追踪玻璃的方法
    • WO2012093364A1
    • 2012-07-12
    • PCT/IB2012/050042
    • 2012-01-04
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBHSCHMITT, HolgerGRASS, Michael
    • SCHMITT, HolgerGRASS, Michael
    • A61B6/03
    • G06T11/008A61B6/032A61B6/469A61B6/481A61B6/488A61B6/504
    • The present invention relates to a computed tomography system (10) and a corresponding method which enable tracking of a contrast material bolus and which involve a reduced radiation dose. The proposed computed tomography system (10) comprises an acquisition unit including an X-ray source (18) and an X-ray detector (30) for acquiring projection data sets (42, 44, 46), a reconstruction unit (41) for reconstructing a planning image (48) from a first projection data set (42), an identification unit (52) for identifying a region of interest (40) in the planning image (48), a selection unit (54) for selecting a projection angle (60) through the region of interest (40), a calculator (62) for calculating a target projection value (64) for a projection of said region of interest (40) with the selected projection angle (60), a control unit (32) for controlling said acquisition unit to acquire a second, reduced projection data set (44) including projection data from projections of said region of interest (40) with the selected projection angle (60), and a comparator (68) for comparing projection values of the second projection data set (44) with the target projection value (64), wherein the control unit (32) is adapted to control the acquisition unit to initiate the acquisition of a third projection data set (46) based on the comparison result (70) and to reconstruct a diagnostic image (50) from the third projection data set (46).
    • 本发明涉及计算机断层摄影系统(10)和相应的方法,其能够跟踪造影剂推注并且涉及减小的辐射剂量。 所提出的计算机断层摄影系统(10)包括:采集单元,包括用于获取投影数据组(42,44,46)的X射线源(18)和X射线检测器(30);重建单元(41),用于 从第一投影数据集(42)重建规划图像(48);识别单元(52),用于识别所述规划图像(48)中的感兴趣区域(40);选择单元(54),用于选择投影 通过感兴趣区域(40)的角度(60);计算器(62),用于计算用于所选择的投影角度(60)的所述感兴趣区域(40)的投影的目标投影值(64);控制单元 (32),用于控制所述获取单元以选择的投影角度(60)获取包括来自所述感兴趣区域(40)的投影的投影数据的第二缩减投影数据集(44),以及比较器 第二投影数据集(44)的投影值与目标投影值(64),w 这里,控制单元(32)适于控制采集单元基于比较结果(70)开始获取第三投影数据集(46),并且从第三投影数据集重建诊断图像(50) (46)。