用Fast BP实现复杂的函数逼近,对初学者有一定的帮助,是在BP的基础上增加了R.-Fast BP achieved with a complex function approximation, there is some help for beginners, is based on the BP increase in R.

CT算法与原理，包括主流的FBP,ART,SIRT等详尽讲解-CT algorithms and principles, detailed explanations, including the mainstream of the FBP, ART, SIRT.