【摘要】 为实现对轴对称流场的精确诊断,该文提出一种对发射计算层析的轴对称流场投影进行修正的方法。该方法通过Radon变换自动找出倾斜投影的对称轴,投影修正后取与对称轴垂直的数据作为截面投影进行重建。通过数值模拟对该投影修正方法进行了验证,并对重建结果进行了分析。分析结果表明:在轴对称流场存在小角度偏转时,对其投影进行对称轴修正后的重建精度高于投影未修正时的重建精度,并且在5°范围内偏转角度越大修正后重建精度越高。更多还原

【Abstract】 In order to diagnose the axisymmetric flow field more accurately,a new method to correct the axisymmetric flow field projection in emission computerized tomography is proposed here.This method can find out the symmetry axis of the oblique projection automatically by Radon transform.After correcting the projection,the data perpendicular to the axis of symmetry are chosen as the section projection for reconstruction.This projection corrected method is verified by numerical simulation and the reconstruction results are analyzed.The results show:when the axisymmetric flow field has a small angle deflection,the reconstruction accuracy with the corrected projection is higher than that without the corrected projection.Within 5° of deflection angle,the greater the deflection angle is,the higher the reconstruction precision is.更多还原