倒置结构锥形束计算机层析的精确成像与Grangeat算法实现

Implementation of Grangeat Algorithm for Cone Beam Computerized Tomography Based on Reverse Geometry

研究了一种新的圆加垂直单弧段的锥顶轨迹的锥形束计算机层析 (CT)的完全性条件和精确重建的Grangeat方法 ,提出了倒置结构锥形束计算机层析的便于实现的圆加垂直多弧段的成像结构及进行精确重建的完全性条件。利用倒置成像结构与现有成像结构之间的等价关系 ,给出了倒置结构锥形束计算机层析的重建算法。最后 。

Compared to existing cone beam computerized tomography (CT) techniques, the reverse-geometry based cone beam CT (RGCBCT) can provide projection data with considerably higher SNR, and is convenient in the implementation of exact reconstruction. A novel orthogonal circle-and -arc orbit for cone beam CT is proposed. Its completeness condition and the application of the Grangeat method are discussed. A flexible orthogonal circle-and-arcs orbit for RGCBCT together with its completeness condition is proposed. Based on the equivalence between the reverse and traditional imaging geometries, a reconstruction algorithm for RGCBCT and computer simulation results are presented.