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    • 3. 发明授权
    • Computer tomography method for a periodically moving object
    • 用于周期性移动物体的计算机断层摄影方法
    • US07426257B2
    • 2008-09-16
    • US10552399
    • 2004-04-02
    • Thomas KöhlerMichael GrassRoland Proksa
    • Thomas KöhlerMichael GrassRoland Proksa
    • A61B6/03
    • A61B6/541A61B5/1135A61B6/027A61B6/032A61B6/4085A61B6/503A61B6/504
    • The invention relates to a computer tomography method in which a periodically moving object, in particular an organ of the body, is irradiated by a cone-shaped beam cluster (4) along a trajectory which runs on a cylindrical surface. The radiation transmitted through the object is measured by means of a detector unit (16), and at the same time the periodic movement of the object is recorded. In order to reconstruct the absorption distribution of the object, the measured values or the corresponding beams are rebinned to form a number of parallel projections, where for each of these projections a measured value is determined whose beam irradiates the object. The point in time at which this measured value was acquired is allocated to the respective projection. For the reconstruction, which may for example be carried out using a filtered back-projection, only projections whose allocated points in time lie within a predefined, specific time range (H1) within a period of the object movement are used.
    • 本发明涉及一种计算机断层摄影方法,其中周期性移动的物体,特别是身体的脏器被沿着在圆柱形表面上运行的轨迹由锥形束簇(4)照射。 通过检测器单元(16)测量透过物体的辐射,同时记录物体的周期性运动。 为了重建物体的吸收分布,将测量值或对应的光束重新组合以形成多个平行投影,其中对于这些投影中的每一个,确定其光束照射物体的测量值。 将获取该测量值的时间点分配给相应的投影。 对于可以例如使用滤波反投影来进行的重建,仅使用其分配的时间点在物体移动的时段内在预定义的特定时间范围(H 1)内的投影。
    • 4. 发明授权
    • Computer tomography method using redundant measured values
    • 计算机断层摄影法使用冗余测量值
    • US07292717B2
    • 2007-11-06
    • US10560454
    • 2004-06-07
    • Thomas KöhlerRoland Proksa
    • Thomas KöhlerRoland Proksa
    • G06K9/00
    • G06T11/006A61B6/027G06T2211/416
    • The invention relates to a computer tomography method in which a radiation source moves relative to an examination region along, in particular, a helical or circular trajectory. Measured values are acquired by a detector unit and a CT image of the examination region is reconstructed from these measured values. In the reconstruction, a complementary measured value, whose ray is oriented parallel to the ray of the respective measured value that has been acquired but in the opposite direction thereto, is determined for each of at least some measured values that lie within a reconstruction window. Redundant measured values are used to calculate the complementary measured values, with the help in particular of John's equation. The measured values for which complementary measured values have been determined are each replaced by a sum comprised a measured value that has been weighted and a complementary measured value that has been weighted, and a CT image is reconstructed, in particular by an exact method of reconstruction, from the replacement measured values, and where appropriate from acquired measured values, that lie within the reconstruction window.
    • 本发明涉及一种计算机断层摄影方法,其中辐射源相对于沿着特别是螺旋或圆形轨迹的检查区域移动。 通过检测器单元获取测量值,并从这些测量值重建检查区域的CT图像。 在重建中,对于位于重建窗口内的至少一些测量值中的每一个确定其光线平行于已经获取但与其相反方向的相应测量值的射线的互补测量值。 冗余测量值用于计算补充测量值,特别是约翰方程式的帮助。 已经确定了互补测量值的测量值各自被包括被加权的测量值和已经加权的测量值和重建CT图像的和,特别是通过重建的精确方法 ,从替换测量值,并在适当时从获得的测量值,位于重建窗口内。