pseudo-length
2.Coefficient Words Length Optimization of IIR Digital Filters—Linear Pseudo-Boolean inequality system method
3.Projections are truncated when the length of detector is less than the diameter of the slice Mathematically,transform methods of parellel beam CT such as filtered backprojection (FBP)reconstruction are unfit to image reconstruction However in engineering application,this is not absolute In order to reconstruct CT slice by FBP,several methods are developed such as by compensating pseudo data or by acquiring projection in the angle range of 0～2π
