等离子体图像诊断中带吸收校正的轴对称重建

Axial symmetric reconstruction with attenuation correction in plasma image diagnosis

在轴对称等离子体的图像诊断中,根据等离子体在某个方向的X射线强度图像可以重建出辐射系数的空间分布.由于X射线在等离子体的传播过程中存在一定的吸收,需要在重建过程中考虑吸收校正.本文在滤波反投影法(FBP)的基础上,结合X射线在等离子体中的吸收规律,提出了带吸收校正的FBP迭代算法.通过对钠等离子体辐射系数的轴对称重建模拟,发现该算法重建精度高,收敛性好,取得了很好的重建结果.

In plasma image diagnosis, the distribution of X-ray emission coefficients can be reconstructed from the emergent intensity. Due to X-ray absorption through plasma region, an iterative algorithm with attenuation correction for axial symmetric reconstruction was proposed based on filtered back-projection （FBP） algorithm. The simulation results show that this algorithm performs much better on reconstruction effect and convergence compared with other algorithms.