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Multi-source CT systems and pre-reconstruction inversion methods
Multi-source CT systems and pre-reconstruction inversion methods
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机译：多源CT系统和重建前的反演方法
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摘要
A computed tomography scanner has multiple radiation sources or source arrays, in specific geometric dimensions for optimized imaging speed. A CT system with maximum fan-angle Γ and K simultaneously active x-ray sources distributed over an angle of π−2Γ radians, the sources partially overlapping on a detector array, measures summed projection data corresponding to K or less line-integrals at each detector element. When the CT machine's dimensions RM, Rd, and RS, corresponding respectively to the measurement field-of-view, detector distance from iso-center, and source distance from iso-center, are such that projections of the two extreme radiation sources do not overlap on the detector, the individual line-integrals can be recovered by inversion of linear systems comprising K or less rows in fewer unknown than rows; the unknowns given by the exponential of the negative of the line integrals to be recovered. The CT scanner then reconstructs an image from the line-integral estimates.
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机译：计算机断层扫描仪具有特定几何尺寸的多个辐射源或辐射源阵列，以优化成像速度。具有最大扇角Γ和K同时在π-2Γ弧度的角度上分布的有源X射线源的CT系统，这些源在检测器阵列上部分重叠，测量与每个K或更少的线积分相对应的总投影数据探测器元件。当CT机的尺寸R M ，R d 和R S 分别对应于测量视野时，探测器距等中心点以及与等中心点的距离，使得两个极端辐射源的投影在检测器上不重叠，可以通过对包含K个或更少行的线性系统求反，以更少的未知数来恢复单个线积分比行由要恢复的线积分的负数的指数给出的未知数。然后，CT扫描仪根据线积分估计值重建图像。
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