本论文详细论述了CT重建过程中的射线硬化问题，并利用仿真方法充分验证并给出结果，在实际系统设计中具有指导意义。 注：本论文用CAJView打开。-This paper discusses in detail the reconstruction process in the CT beam hardening problems, and fully validated by simulation results are given in the actual system design wi